diff options
Diffstat (limited to 'fs/reiserfs/journal.c')
| -rw-r--r-- | fs/reiserfs/journal.c | 4393 |
1 files changed, 4393 insertions, 0 deletions
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c new file mode 100644 index 00000000..812e2c05 --- /dev/null +++ b/fs/reiserfs/journal.c @@ -0,0 +1,4393 @@ +/* +** Write ahead logging implementation copyright Chris Mason 2000 +** +** The background commits make this code very interelated, and +** overly complex. I need to rethink things a bit....The major players: +** +** journal_begin -- call with the number of blocks you expect to log. +** If the current transaction is too +** old, it will block until the current transaction is +** finished, and then start a new one. +** Usually, your transaction will get joined in with +** previous ones for speed. +** +** journal_join -- same as journal_begin, but won't block on the current +** transaction regardless of age. Don't ever call +** this. Ever. There are only two places it should be +** called from, and they are both inside this file. +** +** journal_mark_dirty -- adds blocks into this transaction. clears any flags +** that might make them get sent to disk +** and then marks them BH_JDirty. Puts the buffer head +** into the current transaction hash. +** +** journal_end -- if the current transaction is batchable, it does nothing +** otherwise, it could do an async/synchronous commit, or +** a full flush of all log and real blocks in the +** transaction. +** +** flush_old_commits -- if the current transaction is too old, it is ended and +** commit blocks are sent to disk. Forces commit blocks +** to disk for all backgrounded commits that have been +** around too long. +** -- Note, if you call this as an immediate flush from +** from within kupdate, it will ignore the immediate flag +*/ + +#include <linux/time.h> +#include <linux/semaphore.h> +#include <linux/vmalloc.h> +#include <linux/reiserfs_fs.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/fcntl.h> +#include <linux/stat.h> +#include <linux/string.h> +#include <linux/smp_lock.h> +#include <linux/buffer_head.h> +#include <linux/workqueue.h> +#include <linux/writeback.h> +#include <linux/blkdev.h> +#include <linux/backing-dev.h> +#include <linux/uaccess.h> +#include <linux/slab.h> + +#include <asm/system.h> + +/* gets a struct reiserfs_journal_list * from a list head */ +#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ + j_list)) +#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ + j_working_list)) + +/* the number of mounted filesystems. This is used to decide when to +** start and kill the commit workqueue +*/ +static int reiserfs_mounted_fs_count; + +static struct workqueue_struct *commit_wq; + +#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit + structs at 4k */ +#define BUFNR 64 /*read ahead */ + +/* cnode stat bits. Move these into reiserfs_fs.h */ + +#define BLOCK_FREED 2 /* this block was freed, and can't be written. */ +#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */ + +#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */ +#define BLOCK_DIRTIED 5 + +/* journal list state bits */ +#define LIST_TOUCHED 1 +#define LIST_DIRTY 2 +#define LIST_COMMIT_PENDING 4 /* someone will commit this list */ + +/* flags for do_journal_end */ +#define FLUSH_ALL 1 /* flush commit and real blocks */ +#define COMMIT_NOW 2 /* end and commit this transaction */ +#define WAIT 4 /* wait for the log blocks to hit the disk */ + +static int do_journal_end(struct reiserfs_transaction_handle *, + struct super_block *, unsigned long nblocks, + int flags); +static int flush_journal_list(struct super_block *s, + struct reiserfs_journal_list *jl, int flushall); +static int flush_commit_list(struct super_block *s, + struct reiserfs_journal_list *jl, int flushall); +static int can_dirty(struct reiserfs_journal_cnode *cn); +static int journal_join(struct reiserfs_transaction_handle *th, + struct super_block *sb, unsigned long nblocks); +static int release_journal_dev(struct super_block *super, + struct reiserfs_journal *journal); +static int dirty_one_transaction(struct super_block *s, + struct reiserfs_journal_list *jl); +static void flush_async_commits(struct work_struct *work); +static void queue_log_writer(struct super_block *s); + +/* values for join in do_journal_begin_r */ +enum { + JBEGIN_REG = 0, /* regular journal begin */ + JBEGIN_JOIN = 1, /* join the running transaction if at all possible */ + JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */ +}; + +static int do_journal_begin_r(struct reiserfs_transaction_handle *th, + struct super_block *sb, + unsigned long nblocks, int join); + +static void init_journal_hash(struct super_block *sb) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + memset(journal->j_hash_table, 0, + JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); +} + +/* +** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to +** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for +** more details. +*/ +static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) +{ + if (bh) { + clear_buffer_dirty(bh); + clear_buffer_journal_test(bh); + } + return 0; +} + +static void disable_barrier(struct super_block *s) +{ + REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH); + printk("reiserfs: disabling flush barriers on %s\n", + reiserfs_bdevname(s)); +} + +static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block + *sb) +{ + struct reiserfs_bitmap_node *bn; + static int id; + + bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS); + if (!bn) { + return NULL; + } + bn->data = kzalloc(sb->s_blocksize, GFP_NOFS); + if (!bn->data) { + kfree(bn); + return NULL; + } + bn->id = id++; + INIT_LIST_HEAD(&bn->list); + return bn; +} + +static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_bitmap_node *bn = NULL; + struct list_head *entry = journal->j_bitmap_nodes.next; + + journal->j_used_bitmap_nodes++; + repeat: + + if (entry != &journal->j_bitmap_nodes) { + bn = list_entry(entry, struct reiserfs_bitmap_node, list); + list_del(entry); + memset(bn->data, 0, sb->s_blocksize); + journal->j_free_bitmap_nodes--; + return bn; + } + bn = allocate_bitmap_node(sb); + if (!bn) { + yield(); + goto repeat; + } + return bn; +} +static inline void free_bitmap_node(struct super_block *sb, + struct reiserfs_bitmap_node *bn) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + journal->j_used_bitmap_nodes--; + if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) { + kfree(bn->data); + kfree(bn); + } else { + list_add(&bn->list, &journal->j_bitmap_nodes); + journal->j_free_bitmap_nodes++; + } +} + +static void allocate_bitmap_nodes(struct super_block *sb) +{ + int i; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_bitmap_node *bn = NULL; + for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) { + bn = allocate_bitmap_node(sb); + if (bn) { + list_add(&bn->list, &journal->j_bitmap_nodes); + journal->j_free_bitmap_nodes++; + } else { + break; /* this is ok, we'll try again when more are needed */ + } + } +} + +static int set_bit_in_list_bitmap(struct super_block *sb, + b_blocknr_t block, + struct reiserfs_list_bitmap *jb) +{ + unsigned int bmap_nr = block / (sb->s_blocksize << 3); + unsigned int bit_nr = block % (sb->s_blocksize << 3); + + if (!jb->bitmaps[bmap_nr]) { + jb->bitmaps[bmap_nr] = get_bitmap_node(sb); + } + set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data); + return 0; +} + +static void cleanup_bitmap_list(struct super_block *sb, + struct reiserfs_list_bitmap *jb) +{ + int i; + if (jb->bitmaps == NULL) + return; + + for (i = 0; i < reiserfs_bmap_count(sb); i++) { + if (jb->bitmaps[i]) { + free_bitmap_node(sb, jb->bitmaps[i]); + jb->bitmaps[i] = NULL; + } + } +} + +/* +** only call this on FS unmount. +*/ +static int free_list_bitmaps(struct super_block *sb, + struct reiserfs_list_bitmap *jb_array) +{ + int i; + struct reiserfs_list_bitmap *jb; + for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { + jb = jb_array + i; + jb->journal_list = NULL; + cleanup_bitmap_list(sb, jb); + vfree(jb->bitmaps); + jb->bitmaps = NULL; + } + return 0; +} + +static int free_bitmap_nodes(struct super_block *sb) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct list_head *next = journal->j_bitmap_nodes.next; + struct reiserfs_bitmap_node *bn; + + while (next != &journal->j_bitmap_nodes) { + bn = list_entry(next, struct reiserfs_bitmap_node, list); + list_del(next); + kfree(bn->data); + kfree(bn); + next = journal->j_bitmap_nodes.next; + journal->j_free_bitmap_nodes--; + } + + return 0; +} + +/* +** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. +** jb_array is the array to be filled in. +*/ +int reiserfs_allocate_list_bitmaps(struct super_block *sb, + struct reiserfs_list_bitmap *jb_array, + unsigned int bmap_nr) +{ + int i; + int failed = 0; + struct reiserfs_list_bitmap *jb; + int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *); + + for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { + jb = jb_array + i; + jb->journal_list = NULL; + jb->bitmaps = vmalloc(mem); + if (!jb->bitmaps) { + reiserfs_warning(sb, "clm-2000", "unable to " + "allocate bitmaps for journal lists"); + failed = 1; + break; + } + memset(jb->bitmaps, 0, mem); + } + if (failed) { + free_list_bitmaps(sb, jb_array); + return -1; + } + return 0; +} + +/* +** find an available list bitmap. If you can't find one, flush a commit list +** and try again +*/ +static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb, + struct reiserfs_journal_list + *jl) +{ + int i, j; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_list_bitmap *jb = NULL; + + for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) { + i = journal->j_list_bitmap_index; + journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS; + jb = journal->j_list_bitmap + i; + if (journal->j_list_bitmap[i].journal_list) { + flush_commit_list(sb, + journal->j_list_bitmap[i]. + journal_list, 1); + if (!journal->j_list_bitmap[i].journal_list) { + break; + } + } else { + break; + } + } + if (jb->journal_list) { /* double check to make sure if flushed correctly */ + return NULL; + } + jb->journal_list = jl; + return jb; +} + +/* +** allocates a new chunk of X nodes, and links them all together as a list. +** Uses the cnode->next and cnode->prev pointers +** returns NULL on failure +*/ +static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) +{ + struct reiserfs_journal_cnode *head; + int i; + if (num_cnodes <= 0) { + return NULL; + } + head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)); + if (!head) { + return NULL; + } + memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode)); + head[0].prev = NULL; + head[0].next = head + 1; + for (i = 1; i < num_cnodes; i++) { + head[i].prev = head + (i - 1); + head[i].next = head + (i + 1); /* if last one, overwrite it after the if */ + } + head[num_cnodes - 1].next = NULL; + return head; +} + +/* +** pulls a cnode off the free list, or returns NULL on failure +*/ +static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb) +{ + struct reiserfs_journal_cnode *cn; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + + reiserfs_check_lock_depth(sb, "get_cnode"); + + if (journal->j_cnode_free <= 0) { + return NULL; + } + journal->j_cnode_used++; + journal->j_cnode_free--; + cn = journal->j_cnode_free_list; + if (!cn) { + return cn; + } + if (cn->next) { + cn->next->prev = NULL; + } + journal->j_cnode_free_list = cn->next; + memset(cn, 0, sizeof(struct reiserfs_journal_cnode)); + return cn; +} + +/* +** returns a cnode to the free list +*/ +static void free_cnode(struct super_block *sb, + struct reiserfs_journal_cnode *cn) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + + reiserfs_check_lock_depth(sb, "free_cnode"); + + journal->j_cnode_used--; + journal->j_cnode_free++; + /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */ + cn->next = journal->j_cnode_free_list; + if (journal->j_cnode_free_list) { + journal->j_cnode_free_list->prev = cn; + } + cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */ + journal->j_cnode_free_list = cn; +} + +static void clear_prepared_bits(struct buffer_head *bh) +{ + clear_buffer_journal_prepared(bh); + clear_buffer_journal_restore_dirty(bh); +} + +/* return a cnode with same dev, block number and size in table, or null if not found */ +static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct + super_block + *sb, + struct + reiserfs_journal_cnode + **table, + long bl) +{ + struct reiserfs_journal_cnode *cn; + cn = journal_hash(table, sb, bl); + while (cn) { + if (cn->blocknr == bl && cn->sb == sb) + return cn; + cn = cn->hnext; + } + return (struct reiserfs_journal_cnode *)0; +} + +/* +** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated +** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever +** being overwritten by a replay after crashing. +** +** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting +** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make +** sure you never write the block without logging it. +** +** next_zero_bit is a suggestion about the next block to try for find_forward. +** when bl is rejected because it is set in a journal list bitmap, we search +** for the next zero bit in the bitmap that rejected bl. Then, we return that +** through next_zero_bit for find_forward to try. +** +** Just because we return something in next_zero_bit does not mean we won't +** reject it on the next call to reiserfs_in_journal +** +*/ +int reiserfs_in_journal(struct super_block *sb, + unsigned int bmap_nr, int bit_nr, int search_all, + b_blocknr_t * next_zero_bit) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_journal_cnode *cn; + struct reiserfs_list_bitmap *jb; + int i; + unsigned long bl; + + *next_zero_bit = 0; /* always start this at zero. */ + + PROC_INFO_INC(sb, journal.in_journal); + /* If we aren't doing a search_all, this is a metablock, and it will be logged before use. + ** if we crash before the transaction that freed it commits, this transaction won't + ** have committed either, and the block will never be written + */ + if (search_all) { + for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { + PROC_INFO_INC(sb, journal.in_journal_bitmap); + jb = journal->j_list_bitmap + i; + if (jb->journal_list && jb->bitmaps[bmap_nr] && + test_bit(bit_nr, + (unsigned long *)jb->bitmaps[bmap_nr]-> + data)) { + *next_zero_bit = + find_next_zero_bit((unsigned long *) + (jb->bitmaps[bmap_nr]-> + data), + sb->s_blocksize << 3, + bit_nr + 1); + return 1; + } + } + } + + bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr; + /* is it in any old transactions? */ + if (search_all + && (cn = + get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) { + return 1; + } + + /* is it in the current transaction. This should never happen */ + if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) { + BUG(); + return 1; + } + + PROC_INFO_INC(sb, journal.in_journal_reusable); + /* safe for reuse */ + return 0; +} + +/* insert cn into table +*/ +static inline void insert_journal_hash(struct reiserfs_journal_cnode **table, + struct reiserfs_journal_cnode *cn) +{ + struct reiserfs_journal_cnode *cn_orig; + + cn_orig = journal_hash(table, cn->sb, cn->blocknr); + cn->hnext = cn_orig; + cn->hprev = NULL; + if (cn_orig) { + cn_orig->hprev = cn; + } + journal_hash(table, cn->sb, cn->blocknr) = cn; +} + +/* lock the current transaction */ +static inline void lock_journal(struct super_block *sb) +{ + PROC_INFO_INC(sb, journal.lock_journal); + + reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb); +} + +/* unlock the current transaction */ +static inline void unlock_journal(struct super_block *sb) +{ + mutex_unlock(&SB_JOURNAL(sb)->j_mutex); +} + +static inline void get_journal_list(struct reiserfs_journal_list *jl) +{ + jl->j_refcount++; +} + +static inline void put_journal_list(struct super_block *s, + struct reiserfs_journal_list *jl) +{ + if (jl->j_refcount < 1) { + reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d", + jl->j_trans_id, jl->j_refcount); + } + if (--jl->j_refcount == 0) + kfree(jl); +} + +/* +** this used to be much more involved, and I'm keeping it just in case things get ugly again. +** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a +** transaction. +*/ +static void cleanup_freed_for_journal_list(struct super_block *sb, + struct reiserfs_journal_list *jl) +{ + + struct reiserfs_list_bitmap *jb = jl->j_list_bitmap; + if (jb) { + cleanup_bitmap_list(sb, jb); + } + jl->j_list_bitmap->journal_list = NULL; + jl->j_list_bitmap = NULL; +} + +static int journal_list_still_alive(struct super_block *s, + unsigned int trans_id) +{ + struct reiserfs_journal *journal = SB_JOURNAL(s); + struct list_head *entry = &journal->j_journal_list; + struct reiserfs_journal_list *jl; + + if (!list_empty(entry)) { + jl = JOURNAL_LIST_ENTRY(entry->next); + if (jl->j_trans_id <= trans_id) { + return 1; + } + } + return 0; +} + +/* + * If page->mapping was null, we failed to truncate this page for + * some reason. Most likely because it was truncated after being + * logged via data=journal. + * + * This does a check to see if the buffer belongs to one of these + * lost pages before doing the final put_bh. If page->mapping was + * null, it tries to free buffers on the page, which should make the + * final page_cache_release drop the page from the lru. + */ +static void release_buffer_page(struct buffer_head *bh) +{ + struct page *page = bh->b_page; + if (!page->mapping && trylock_page(page)) { + page_cache_get(page); + put_bh(bh); + if (!page->mapping) + try_to_free_buffers(page); + unlock_page(page); + page_cache_release(page); + } else { + put_bh(bh); + } +} + +static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) +{ + char b[BDEVNAME_SIZE]; + + if (buffer_journaled(bh)) { + reiserfs_warning(NULL, "clm-2084", + "pinned buffer %lu:%s sent to disk", + bh->b_blocknr, bdevname(bh->b_bdev, b)); + } + if (uptodate) + set_buffer_uptodate(bh); + else + clear_buffer_uptodate(bh); + + unlock_buffer(bh); + release_buffer_page(bh); +} + +static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate) +{ + if (uptodate) + set_buffer_uptodate(bh); + else + clear_buffer_uptodate(bh); + unlock_buffer(bh); + put_bh(bh); +} + +static void submit_logged_buffer(struct buffer_head *bh) +{ + get_bh(bh); + bh->b_end_io = reiserfs_end_buffer_io_sync; + clear_buffer_journal_new(bh); + clear_buffer_dirty(bh); + if (!test_clear_buffer_journal_test(bh)) + BUG(); + if (!buffer_uptodate(bh)) + BUG(); + submit_bh(WRITE, bh); +} + +static void submit_ordered_buffer(struct buffer_head *bh) +{ + get_bh(bh); + bh->b_end_io = reiserfs_end_ordered_io; + clear_buffer_dirty(bh); + if (!buffer_uptodate(bh)) + BUG(); + submit_bh(WRITE, bh); +} + +static int submit_barrier_buffer(struct buffer_head *bh) +{ + get_bh(bh); + bh->b_end_io = reiserfs_end_ordered_io; + clear_buffer_dirty(bh); + if (!buffer_uptodate(bh)) + BUG(); + return submit_bh(WRITE_BARRIER, bh); +} + +static void check_barrier_completion(struct super_block *s, + struct buffer_head *bh) +{ + if (buffer_eopnotsupp(bh)) { + clear_buffer_eopnotsupp(bh); + disable_barrier(s); + set_buffer_uptodate(bh); + set_buffer_dirty(bh); + reiserfs_write_unlock(s); + sync_dirty_buffer(bh); + reiserfs_write_lock(s); + } +} + +#define CHUNK_SIZE 32 +struct buffer_chunk { + struct buffer_head *bh[CHUNK_SIZE]; + int nr; +}; + +static void write_chunk(struct buffer_chunk *chunk) +{ + int i; + get_fs_excl(); + for (i = 0; i < chunk->nr; i++) { + submit_logged_buffer(chunk->bh[i]); + } + chunk->nr = 0; + put_fs_excl(); +} + +static void write_ordered_chunk(struct buffer_chunk *chunk) +{ + int i; + get_fs_excl(); + for (i = 0; i < chunk->nr; i++) { + submit_ordered_buffer(chunk->bh[i]); + } + chunk->nr = 0; + put_fs_excl(); +} + +static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh, + spinlock_t * lock, void (fn) (struct buffer_chunk *)) +{ + int ret = 0; + BUG_ON(chunk->nr >= CHUNK_SIZE); + chunk->bh[chunk->nr++] = bh; + if (chunk->nr >= CHUNK_SIZE) { + ret = 1; + if (lock) + spin_unlock(lock); + fn(chunk); + if (lock) + spin_lock(lock); + } + return ret; +} + +static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0); +static struct reiserfs_jh *alloc_jh(void) +{ + struct reiserfs_jh *jh; + while (1) { + jh = kmalloc(sizeof(*jh), GFP_NOFS); + if (jh) { + atomic_inc(&nr_reiserfs_jh); + return jh; + } + yield(); + } +} + +/* + * we want to free the jh when the buffer has been written + * and waited on + */ +void reiserfs_free_jh(struct buffer_head *bh) +{ + struct reiserfs_jh *jh; + + jh = bh->b_private; + if (jh) { + bh->b_private = NULL; + jh->bh = NULL; + list_del_init(&jh->list); + kfree(jh); + if (atomic_read(&nr_reiserfs_jh) <= 0) + BUG(); + atomic_dec(&nr_reiserfs_jh); + put_bh(bh); + } +} + +static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh, + int tail) +{ + struct reiserfs_jh *jh; + + if (bh->b_private) { + spin_lock(&j->j_dirty_buffers_lock); + if (!bh->b_private) { + spin_unlock(&j->j_dirty_buffers_lock); + goto no_jh; + } + jh = bh->b_private; + list_del_init(&jh->list); + } else { + no_jh: + get_bh(bh); + jh = alloc_jh(); + spin_lock(&j->j_dirty_buffers_lock); + /* buffer must be locked for __add_jh, should be able to have + * two adds at the same time + */ + BUG_ON(bh->b_private); + jh->bh = bh; + bh->b_private = jh; + } + jh->jl = j->j_current_jl; + if (tail) + list_add_tail(&jh->list, &jh->jl->j_tail_bh_list); + else { + list_add_tail(&jh->list, &jh->jl->j_bh_list); + } + spin_unlock(&j->j_dirty_buffers_lock); + return 0; +} + +int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh) +{ + return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1); +} +int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh) +{ + return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0); +} + +#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list) +static int write_ordered_buffers(spinlock_t * lock, + struct reiserfs_journal *j, + struct reiserfs_journal_list *jl, + struct list_head *list) +{ + struct buffer_head *bh; + struct reiserfs_jh *jh; + int ret = j->j_errno; + struct buffer_chunk chunk; + struct list_head tmp; + INIT_LIST_HEAD(&tmp); + + chunk.nr = 0; + spin_lock(lock); + while (!list_empty(list)) { + jh = JH_ENTRY(list->next); + bh = jh->bh; + get_bh(bh); + if (!trylock_buffer(bh)) { + if (!buffer_dirty(bh)) { + list_move(&jh->list, &tmp); + goto loop_next; + } + spin_unlock(lock); + if (chunk.nr) + write_ordered_chunk(&chunk); + wait_on_buffer(bh); + cond_resched(); + spin_lock(lock); + goto loop_next; + } + /* in theory, dirty non-uptodate buffers should never get here, + * but the upper layer io error paths still have a few quirks. + * Handle them here as gracefully as we can + */ + if (!buffer_uptodate(bh) && buffer_dirty(bh)) { + clear_buffer_dirty(bh); + ret = -EIO; + } + if (buffer_dirty(bh)) { + list_move(&jh->list, &tmp); + add_to_chunk(&chunk, bh, lock, write_ordered_chunk); + } else { + reiserfs_free_jh(bh); + unlock_buffer(bh); + } + loop_next: + put_bh(bh); + cond_resched_lock(lock); + } + if (chunk.nr) { + spin_unlock(lock); + write_ordered_chunk(&chunk); + spin_lock(lock); + } + while (!list_empty(&tmp)) { + jh = JH_ENTRY(tmp.prev); + bh = jh->bh; + get_bh(bh); + reiserfs_free_jh(bh); + + if (buffer_locked(bh)) { + spin_unlock(lock); + wait_on_buffer(bh); + spin_lock(lock); + } + if (!buffer_uptodate(bh)) { + ret = -EIO; + } + /* ugly interaction with invalidatepage here. + * reiserfs_invalidate_page will pin any buffer that has a valid + * journal head from an older transaction. If someone else sets + * our buffer dirty after we write it in the first loop, and + * then someone truncates the page away, nobody will ever write + * the buffer. We're safe if we write the page one last time + * after freeing the journal header. + */ + if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) { + spin_unlock(lock); + ll_rw_block(WRITE, 1, &bh); + spin_lock(lock); + } + put_bh(bh); + cond_resched_lock(lock); + } + spin_unlock(lock); + return ret; +} + +static int flush_older_commits(struct super_block *s, + struct reiserfs_journal_list *jl) +{ + struct reiserfs_journal *journal = SB_JOURNAL(s); + struct reiserfs_journal_list *other_jl; + struct reiserfs_journal_list *first_jl; + struct list_head *entry; + unsigned int trans_id = jl->j_trans_id; + unsigned int other_trans_id; + unsigned int first_trans_id; + + find_first: + /* + * first we walk backwards to find the oldest uncommitted transation + */ + first_jl = jl; + entry = jl->j_list.prev; + while (1) { + other_jl = JOURNAL_LIST_ENTRY(entry); + if (entry == &journal->j_journal_list || + atomic_read(&other_jl->j_older_commits_done)) + break; + + first_jl = other_jl; + entry = other_jl->j_list.prev; + } + + /* if we didn't find any older uncommitted transactions, return now */ + if (first_jl == jl) { + return 0; + } + + first_trans_id = first_jl->j_trans_id; + + entry = &first_jl->j_list; + while (1) { + other_jl = JOURNAL_LIST_ENTRY(entry); + other_trans_id = other_jl->j_trans_id; + + if (other_trans_id < trans_id) { + if (atomic_read(&other_jl->j_commit_left) != 0) { + flush_commit_list(s, other_jl, 0); + + /* list we were called with is gone, return */ + if (!journal_list_still_alive(s, trans_id)) + return 1; + + /* the one we just flushed is gone, this means all + * older lists are also gone, so first_jl is no longer + * valid either. Go back to the beginning. + */ + if (!journal_list_still_alive + (s, other_trans_id)) { + goto find_first; + } + } + entry = entry->next; + if (entry == &journal->j_journal_list) + return 0; + } else { + return 0; + } + } + return 0; +} + +static int reiserfs_async_progress_wait(struct super_block *s) +{ + struct reiserfs_journal *j = SB_JOURNAL(s); + + if (atomic_read(&j->j_async_throttle)) { + reiserfs_write_unlock(s); + congestion_wait(BLK_RW_ASYNC, HZ / 10); + reiserfs_write_lock(s); + } + + return 0; +} + +/* +** if this journal list still has commit blocks unflushed, send them to disk. +** +** log areas must be flushed in order (transaction 2 can't commit before transaction 1) +** Before the commit block can by written, every other log block must be safely on disk +** +*/ +static int flush_commit_list(struct super_block *s, + struct reiserfs_journal_list *jl, int flushall) +{ + int i; + b_blocknr_t bn; + struct buffer_head *tbh = NULL; + unsigned int trans_id = jl->j_trans_id; + struct reiserfs_journal *journal = SB_JOURNAL(s); + int barrier = 0; + int retval = 0; + int write_len; + + reiserfs_check_lock_depth(s, "flush_commit_list"); + + if (atomic_read(&jl->j_older_commits_done)) { + return 0; + } + + get_fs_excl(); + + /* before we can put our commit blocks on disk, we have to make sure everyone older than + ** us is on disk too + */ + BUG_ON(jl->j_len <= 0); + BUG_ON(trans_id == journal->j_trans_id); + + get_journal_list(jl); + if (flushall) { + if (flush_older_commits(s, jl) == 1) { + /* list disappeared during flush_older_commits. return */ + goto put_jl; + } + } + + /* make sure nobody is trying to flush this one at the same time */ + reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s); + + if (!journal_list_still_alive(s, trans_id)) { + mutex_unlock(&jl->j_commit_mutex); + goto put_jl; + } + BUG_ON(jl->j_trans_id == 0); + + /* this commit is done, exit */ + if (atomic_read(&(jl->j_commit_left)) <= 0) { + if (flushall) { + atomic_set(&(jl->j_older_commits_done), 1); + } + mutex_unlock(&jl->j_commit_mutex); + goto put_jl; + } + + if (!list_empty(&jl->j_bh_list)) { + int ret; + + /* + * We might sleep in numerous places inside + * write_ordered_buffers. Relax the write lock. + */ + reiserfs_write_unlock(s); + ret = write_ordered_buffers(&journal->j_dirty_buffers_lock, + journal, jl, &jl->j_bh_list); + if (ret < 0 && retval == 0) + retval = ret; + reiserfs_write_lock(s); + } + BUG_ON(!list_empty(&jl->j_bh_list)); + /* + * for the description block and all the log blocks, submit any buffers + * that haven't already reached the disk. Try to write at least 256 + * log blocks. later on, we will only wait on blocks that correspond + * to this transaction, but while we're unplugging we might as well + * get a chunk of data on there. + */ + atomic_inc(&journal->j_async_throttle); + write_len = jl->j_len + 1; + if (write_len < 256) + write_len = 256; + for (i = 0 ; i < write_len ; i++) { + bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) % + SB_ONDISK_JOURNAL_SIZE(s); + tbh = journal_find_get_block(s, bn); + if (tbh) { + if (buffer_dirty(tbh)) { + reiserfs_write_unlock(s); + ll_rw_block(WRITE, 1, &tbh); + reiserfs_write_lock(s); + } + put_bh(tbh) ; + } + } + atomic_dec(&journal->j_async_throttle); + + /* We're skipping the commit if there's an error */ + if (retval || reiserfs_is_journal_aborted(journal)) + barrier = 0; + + /* wait on everything written so far before writing the commit + * if we are in barrier mode, send the commit down now + */ + barrier = reiserfs_barrier_flush(s); + if (barrier) { + int ret; + lock_buffer(jl->j_commit_bh); + ret = submit_barrier_buffer(jl->j_commit_bh); + if (ret == -EOPNOTSUPP) { + set_buffer_uptodate(jl->j_commit_bh); + disable_barrier(s); + barrier = 0; + } + } + for (i = 0; i < (jl->j_len + 1); i++) { + bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + + (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s); + tbh = journal_find_get_block(s, bn); + + reiserfs_write_unlock(s); + wait_on_buffer(tbh); + reiserfs_write_lock(s); + // since we're using ll_rw_blk above, it might have skipped over + // a locked buffer. Double check here + // + /* redundant, sync_dirty_buffer() checks */ + if (buffer_dirty(tbh)) { + reiserfs_write_unlock(s); + sync_dirty_buffer(tbh); + reiserfs_write_lock(s); + } + if (unlikely(!buffer_uptodate(tbh))) { +#ifdef CONFIG_REISERFS_CHECK + reiserfs_warning(s, "journal-601", + "buffer write failed"); +#endif + retval = -EIO; + } + put_bh(tbh); /* once for journal_find_get_block */ + put_bh(tbh); /* once due to original getblk in do_journal_end */ + atomic_dec(&(jl->j_commit_left)); + } + + BUG_ON(atomic_read(&(jl->j_commit_left)) != 1); + + if (!barrier) { + /* If there was a write error in the journal - we can't commit + * this transaction - it will be invalid and, if successful, + * will just end up propagating the write error out to + * the file system. */ + if (likely(!retval && !reiserfs_is_journal_aborted (journal))) { + if (buffer_dirty(jl->j_commit_bh)) + BUG(); + mark_buffer_dirty(jl->j_commit_bh) ; + reiserfs_write_unlock(s); + sync_dirty_buffer(jl->j_commit_bh) ; + reiserfs_write_lock(s); + } + } else { + reiserfs_write_unlock(s); + wait_on_buffer(jl->j_commit_bh); + reiserfs_write_lock(s); + } + + check_barrier_completion(s, jl->j_commit_bh); + + /* If there was a write error in the journal - we can't commit this + * transaction - it will be invalid and, if successful, will just end + * up propagating the write error out to the filesystem. */ + if (unlikely(!buffer_uptodate(jl->j_commit_bh))) { +#ifdef CONFIG_REISERFS_CHECK + reiserfs_warning(s, "journal-615", "buffer write failed"); +#endif + retval = -EIO; + } + bforget(jl->j_commit_bh); + if (journal->j_last_commit_id != 0 && + (jl->j_trans_id - journal->j_last_commit_id) != 1) { + reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu", + journal->j_last_commit_id, jl->j_trans_id); + } + journal->j_last_commit_id = jl->j_trans_id; + + /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */ + cleanup_freed_for_journal_list(s, jl); + + retval = retval ? retval : journal->j_errno; + + /* mark the metadata dirty */ + if (!retval) + dirty_one_transaction(s, jl); + atomic_dec(&(jl->j_commit_left)); + + if (flushall) { + atomic_set(&(jl->j_older_commits_done), 1); + } + mutex_unlock(&jl->j_commit_mutex); + put_jl: + put_journal_list(s, jl); + + if (retval) + reiserfs_abort(s, retval, "Journal write error in %s", + __func__); + put_fs_excl(); + return retval; +} + +/* +** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or +** returns NULL if it can't find anything +*/ +static struct reiserfs_journal_list *find_newer_jl_for_cn(struct + reiserfs_journal_cnode + *cn) +{ + struct super_block *sb = cn->sb; + b_blocknr_t blocknr = cn->blocknr; + + cn = cn->hprev; + while (cn) { + if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) { + return cn->jlist; + } + cn = cn->hprev; + } + return NULL; +} + +static int newer_jl_done(struct reiserfs_journal_cnode *cn) +{ + struct super_block *sb = cn->sb; + b_blocknr_t blocknr = cn->blocknr; + + cn = cn->hprev; + while (cn) { + if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist && + atomic_read(&cn->jlist->j_commit_left) != 0) + return 0; + cn = cn->hprev; + } + return 1; +} + +static void remove_journal_hash(struct super_block *, + struct reiserfs_journal_cnode **, + struct reiserfs_journal_list *, unsigned long, + int); + +/* +** once all the real blocks have been flushed, it is safe to remove them from the +** journal list for this transaction. Aside from freeing the cnode, this also allows the +** block to be reallocated for data blocks if it had been deleted. +*/ +static void remove_all_from_journal_list(struct super_block *sb, + struct reiserfs_journal_list *jl, + int debug) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_journal_cnode *cn, *last; + cn = jl->j_realblock; + + /* which is better, to lock once around the whole loop, or + ** to lock for each call to remove_journal_hash? + */ + while (cn) { + if (cn->blocknr != 0) { + if (debug) { + reiserfs_warning(sb, "reiserfs-2201", + "block %u, bh is %d, state %ld", + cn->blocknr, cn->bh ? 1 : 0, + cn->state); + } + cn->state = 0; + remove_journal_hash(sb, journal->j_list_hash_table, + jl, cn->blocknr, 1); + } + last = cn; + cn = cn->next; + free_cnode(sb, last); + } + jl->j_realblock = NULL; +} + +/* +** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block. +** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start +** releasing blocks in this transaction for reuse as data blocks. +** called by flush_journal_list, before it calls remove_all_from_journal_list +** +*/ +static int _update_journal_header_block(struct super_block *sb, + unsigned long offset, + unsigned int trans_id) +{ + struct reiserfs_journal_header *jh; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + + if (reiserfs_is_journal_aborted(journal)) + return -EIO; + + if (trans_id >= journal->j_last_flush_trans_id) { + if (buffer_locked((journal->j_header_bh))) { + reiserfs_write_unlock(sb); + wait_on_buffer((journal->j_header_bh)); + reiserfs_write_lock(sb); + if (unlikely(!buffer_uptodate(journal->j_header_bh))) { +#ifdef CONFIG_REISERFS_CHECK + reiserfs_warning(sb, "journal-699", + "buffer write failed"); +#endif + return -EIO; + } + } + journal->j_last_flush_trans_id = trans_id; + journal->j_first_unflushed_offset = offset; + jh = (struct reiserfs_journal_header *)(journal->j_header_bh-> + b_data); + jh->j_last_flush_trans_id = cpu_to_le32(trans_id); + jh->j_first_unflushed_offset = cpu_to_le32(offset); + jh->j_mount_id = cpu_to_le32(journal->j_mount_id); + + if (reiserfs_barrier_flush(sb)) { + int ret; + lock_buffer(journal->j_header_bh); + ret = submit_barrier_buffer(journal->j_header_bh); + if (ret == -EOPNOTSUPP) { + set_buffer_uptodate(journal->j_header_bh); + disable_barrier(sb); + goto sync; + } + reiserfs_write_unlock(sb); + wait_on_buffer(journal->j_header_bh); + reiserfs_write_lock(sb); + check_barrier_completion(sb, journal->j_header_bh); + } else { + sync: + set_buffer_dirty(journal->j_header_bh); + reiserfs_write_unlock(sb); + sync_dirty_buffer(journal->j_header_bh); + reiserfs_write_lock(sb); + } + if (!buffer_uptodate(journal->j_header_bh)) { + reiserfs_warning(sb, "journal-837", + "IO error during journal replay"); + return -EIO; + } + } + return 0; +} + +static int update_journal_header_block(struct super_block *sb, + unsigned long offset, + unsigned int trans_id) +{ + return _update_journal_header_block(sb, offset, trans_id); +} + +/* +** flush any and all journal lists older than you are +** can only be called from flush_journal_list +*/ +static int flush_older_journal_lists(struct super_block *sb, + struct reiserfs_journal_list *jl) +{ + struct list_head *entry; + struct reiserfs_journal_list *other_jl; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + unsigned int trans_id = jl->j_trans_id; + + /* we know we are the only ones flushing things, no extra race + * protection is required. + */ + restart: + entry = journal->j_journal_list.next; + /* Did we wrap? */ + if (entry == &journal->j_journal_list) + return 0; + other_jl = JOURNAL_LIST_ENTRY(entry); + if (other_jl->j_trans_id < trans_id) { + BUG_ON(other_jl->j_refcount <= 0); + /* do not flush all */ + flush_journal_list(sb, other_jl, 0); + + /* other_jl is now deleted from the list */ + goto restart; + } + return 0; +} + +static void del_from_work_list(struct super_block *s, + struct reiserfs_journal_list *jl) +{ + struct reiserfs_journal *journal = SB_JOURNAL(s); + if (!list_empty(&jl->j_working_list)) { + list_del_init(&jl->j_working_list); + journal->j_num_work_lists--; + } +} + +/* flush a journal list, both commit and real blocks +** +** always set flushall to 1, unless you are calling from inside +** flush_journal_list +** +** IMPORTANT. This can only be called while there are no journal writers, +** and the journal is locked. That means it can only be called from +** do_journal_end, or by journal_release +*/ +static int flush_journal_list(struct super_block *s, + struct reiserfs_journal_list *jl, int flushall) +{ + struct reiserfs_journal_list *pjl; + struct reiserfs_journal_cnode *cn, *last; + int count; + int was_jwait = 0; + int was_dirty = 0; + struct buffer_head *saved_bh; + unsigned long j_len_saved = jl->j_len; + struct reiserfs_journal *journal = SB_JOURNAL(s); + int err = 0; + + BUG_ON(j_len_saved <= 0); + + if (atomic_read(&journal->j_wcount) != 0) { + reiserfs_warning(s, "clm-2048", "called with wcount %d", + atomic_read(&journal->j_wcount)); + } + BUG_ON(jl->j_trans_id == 0); + + /* if flushall == 0, the lock is already held */ + if (flushall) { + reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); + } else if (mutex_trylock(&journal->j_flush_mutex)) { + BUG(); + } + + count = 0; + if (j_len_saved > journal->j_trans_max) { + reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu", + j_len_saved, jl->j_trans_id); + return 0; + } + + get_fs_excl(); + + /* if all the work is already done, get out of here */ + if (atomic_read(&(jl->j_nonzerolen)) <= 0 && + atomic_read(&(jl->j_commit_left)) <= 0) { + goto flush_older_and_return; + } + + /* start by putting the commit list on disk. This will also flush + ** the commit lists of any olders transactions + */ + flush_commit_list(s, jl, 1); + + if (!(jl->j_state & LIST_DIRTY) + && !reiserfs_is_journal_aborted(journal)) + BUG(); + + /* are we done now? */ + if (atomic_read(&(jl->j_nonzerolen)) <= 0 && + atomic_read(&(jl->j_commit_left)) <= 0) { + goto flush_older_and_return; + } + + /* loop through each cnode, see if we need to write it, + ** or wait on a more recent transaction, or just ignore it + */ + if (atomic_read(&(journal->j_wcount)) != 0) { + reiserfs_panic(s, "journal-844", "journal list is flushing, " + "wcount is not 0"); + } + cn = jl->j_realblock; + while (cn) { + was_jwait = 0; + was_dirty = 0; + saved_bh = NULL; + /* blocknr of 0 is no longer in the hash, ignore it */ + if (cn->blocknr == 0) { + goto free_cnode; + } + + /* This transaction failed commit. Don't write out to the disk */ + if (!(jl->j_state & LIST_DIRTY)) + goto free_cnode; + + pjl = find_newer_jl_for_cn(cn); + /* the order is important here. We check pjl to make sure we + ** don't clear BH_JDirty_wait if we aren't the one writing this + ** block to disk + */ + if (!pjl && cn->bh) { + saved_bh = cn->bh; + + /* we do this to make sure nobody releases the buffer while + ** we are working with it + */ + get_bh(saved_bh); + + if (buffer_journal_dirty(saved_bh)) { + BUG_ON(!can_dirty(cn)); + was_jwait = 1; + was_dirty = 1; + } else if (can_dirty(cn)) { + /* everything with !pjl && jwait should be writable */ + BUG(); + } + } + + /* if someone has this block in a newer transaction, just make + ** sure they are committed, and don't try writing it to disk + */ + if (pjl) { + if (atomic_read(&pjl->j_commit_left)) + flush_commit_list(s, pjl, 1); + goto free_cnode; + } + + /* bh == NULL when the block got to disk on its own, OR, + ** the block got freed in a future transaction + */ + if (saved_bh == NULL) { + goto free_cnode; + } + + /* this should never happen. kupdate_one_transaction has this list + ** locked while it works, so we should never see a buffer here that + ** is not marked JDirty_wait + */ + if ((!was_jwait) && !buffer_locked(saved_bh)) { + reiserfs_warning(s, "journal-813", + "BAD! buffer %llu %cdirty %cjwait, " + "not in a newer tranasction", + (unsigned long long)saved_bh-> + b_blocknr, was_dirty ? ' ' : '!', + was_jwait ? ' ' : '!'); + } + if (was_dirty) { + /* we inc again because saved_bh gets decremented at free_cnode */ + get_bh(saved_bh); + set_bit(BLOCK_NEEDS_FLUSH, &cn->state); + lock_buffer(saved_bh); + BUG_ON(cn->blocknr != saved_bh->b_blocknr); + if (buffer_dirty(saved_bh)) + submit_logged_buffer(saved_bh); + else + unlock_buffer(saved_bh); + count++; + } else { + reiserfs_warning(s, "clm-2082", + "Unable to flush buffer %llu in %s", + (unsigned long long)saved_bh-> + b_blocknr, __func__); + } + free_cnode: + last = cn; + cn = cn->next; + if (saved_bh) { + /* we incremented this to keep others from taking the buffer head away */ + put_bh(saved_bh); + if (atomic_read(&(saved_bh->b_count)) < 0) { + reiserfs_warning(s, "journal-945", + "saved_bh->b_count < 0"); + } + } + } + if (count > 0) { + cn = jl->j_realblock; + while (cn) { + if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) { + if (!cn->bh) { + reiserfs_panic(s, "journal-1011", + "cn->bh is NULL"); + } + + reiserfs_write_unlock(s); + wait_on_buffer(cn->bh); + reiserfs_write_lock(s); + + if (!cn->bh) { + reiserfs_panic(s, "journal-1012", + "cn->bh is NULL"); + } + if (unlikely(!buffer_uptodate(cn->bh))) { +#ifdef CONFIG_REISERFS_CHECK + reiserfs_warning(s, "journal-949", + "buffer write failed"); +#endif + err = -EIO; + } + /* note, we must clear the JDirty_wait bit after the up to date + ** check, otherwise we race against our flushpage routine + */ + BUG_ON(!test_clear_buffer_journal_dirty + (cn->bh)); + + /* drop one ref for us */ + put_bh(cn->bh); + /* drop one ref for journal_mark_dirty */ + release_buffer_page(cn->bh); + } + cn = cn->next; + } + } + + if (err) + reiserfs_abort(s, -EIO, + "Write error while pushing transaction to disk in %s", + __func__); + flush_older_and_return: + + /* before we can update the journal header block, we _must_ flush all + ** real blocks from all older transactions to disk. This is because + ** once the header block is updated, this transaction will not be + ** replayed after a crash + */ + if (flushall) { + flush_older_journal_lists(s, jl); + } + + err = journal->j_errno; + /* before we can remove everything from the hash tables for this + ** transaction, we must make sure it can never be replayed + ** + ** since we are only called from do_journal_end, we know for sure there + ** are no allocations going on while we are flushing journal lists. So, + ** we only need to update the journal header block for the last list + ** being flushed + */ + if (!err && flushall) { + err = + update_journal_header_block(s, + (jl->j_start + jl->j_len + + 2) % SB_ONDISK_JOURNAL_SIZE(s), + jl->j_trans_id); + if (err) + reiserfs_abort(s, -EIO, + "Write error while updating journal header in %s", + __func__); + } + remove_all_from_journal_list(s, jl, 0); + list_del_init(&jl->j_list); + journal->j_num_lists--; + del_from_work_list(s, jl); + + if (journal->j_last_flush_id != 0 && + (jl->j_trans_id - journal->j_last_flush_id) != 1) { + reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu", + journal->j_last_flush_id, jl->j_trans_id); + } + journal->j_last_flush_id = jl->j_trans_id; + + /* not strictly required since we are freeing the list, but it should + * help find code using dead lists later on + */ + jl->j_len = 0; + atomic_set(&(jl->j_nonzerolen), 0); + jl->j_start = 0; + jl->j_realblock = NULL; + jl->j_commit_bh = NULL; + jl->j_trans_id = 0; + jl->j_state = 0; + put_journal_list(s, jl); + if (flushall) + mutex_unlock(&journal->j_flush_mutex); + put_fs_excl(); + return err; +} + +static int test_transaction(struct super_block *s, + struct reiserfs_journal_list *jl) +{ + struct reiserfs_journal_cnode *cn; + + if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) + return 1; + + cn = jl->j_realblock; + while (cn) { + /* if the blocknr == 0, this has been cleared from the hash, + ** skip it + */ + if (cn->blocknr == 0) { + goto next; + } + if (cn->bh && !newer_jl_done(cn)) + return 0; + next: + cn = cn->next; + cond_resched(); + } + return 0; +} + +static int write_one_transaction(struct super_block *s, + struct reiserfs_journal_list *jl, + struct buffer_chunk *chunk) +{ + struct reiserfs_journal_cnode *cn; + int ret = 0; + + jl->j_state |= LIST_TOUCHED; + del_from_work_list(s, jl); + if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) { + return 0; + } + + cn = jl->j_realblock; + while (cn) { + /* if the blocknr == 0, this has been cleared from the hash, + ** skip it + */ + if (cn->blocknr == 0) { + goto next; + } + if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) { + struct buffer_head *tmp_bh; + /* we can race against journal_mark_freed when we try + * to lock_buffer(cn->bh), so we have to inc the buffer + * count, and recheck things after locking + */ + tmp_bh = cn->bh; + get_bh(tmp_bh); + lock_buffer(tmp_bh); + if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) { + if (!buffer_journal_dirty(tmp_bh) || + buffer_journal_prepared(tmp_bh)) + BUG(); + add_to_chunk(chunk, tmp_bh, NULL, write_chunk); + ret++; + } else { + /* note, cn->bh might be null now */ + unlock_buffer(tmp_bh); + } + put_bh(tmp_bh); + } + next: + cn = cn->next; + cond_resched(); + } + return ret; +} + +/* used by flush_commit_list */ +static int dirty_one_transaction(struct super_block *s, + struct reiserfs_journal_list *jl) +{ + struct reiserfs_journal_cnode *cn; + struct reiserfs_journal_list *pjl; + int ret = 0; + + jl->j_state |= LIST_DIRTY; + cn = jl->j_realblock; + while (cn) { + /* look for a more recent transaction that logged this + ** buffer. Only the most recent transaction with a buffer in + ** it is allowed to send that buffer to disk + */ + pjl = find_newer_jl_for_cn(cn); + if (!pjl && cn->blocknr && cn->bh + && buffer_journal_dirty(cn->bh)) { + BUG_ON(!can_dirty(cn)); + /* if the buffer is prepared, it will either be logged + * or restored. If restored, we need to make sure + * it actually gets marked dirty + */ + clear_buffer_journal_new(cn->bh); + if (buffer_journal_prepared(cn->bh)) { + set_buffer_journal_restore_dirty(cn->bh); + } else { + set_buffer_journal_test(cn->bh); + mark_buffer_dirty(cn->bh); + } + } + cn = cn->next; + } + return ret; +} + +static int kupdate_transactions(struct super_block *s, + struct reiserfs_journal_list *jl, + struct reiserfs_journal_list **next_jl, + unsigned int *next_trans_id, + int num_blocks, int num_trans) +{ + int ret = 0; + int written = 0; + int transactions_flushed = 0; + unsigned int orig_trans_id = jl->j_trans_id; + struct buffer_chunk chunk; + struct list_head *entry; + struct reiserfs_journal *journal = SB_JOURNAL(s); + chunk.nr = 0; + + reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); + if (!journal_list_still_alive(s, orig_trans_id)) { + goto done; + } + + /* we've got j_flush_mutex held, nobody is going to delete any + * of these lists out from underneath us + */ + while ((num_trans && transactions_flushed < num_trans) || + (!num_trans && written < num_blocks)) { + + if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) || + atomic_read(&jl->j_commit_left) + || !(jl->j_state & LIST_DIRTY)) { + del_from_work_list(s, jl); + break; + } + ret = write_one_transaction(s, jl, &chunk); + + if (ret < 0) + goto done; + transactions_flushed++; + written += ret; + entry = jl->j_list.next; + + /* did we wrap? */ + if (entry == &journal->j_journal_list) { + break; + } + jl = JOURNAL_LIST_ENTRY(entry); + + /* don't bother with older transactions */ + if (jl->j_trans_id <= orig_trans_id) + break; + } + if (chunk.nr) { + write_chunk(&chunk); + } + + done: + mutex_unlock(&journal->j_flush_mutex); + return ret; +} + +/* for o_sync and fsync heavy applications, they tend to use +** all the journa list slots with tiny transactions. These +** trigger lots and lots of calls to update the header block, which +** adds seeks and slows things down. +** +** This function tries to clear out a large chunk of the journal lists +** at once, which makes everything faster since only the newest journal +** list updates the header block +*/ +static int flush_used_journal_lists(struct super_block *s, + struct reiserfs_journal_list *jl) +{ + unsigned long len = 0; + unsigned long cur_len; + int ret; + int i; + int limit = 256; + struct reiserfs_journal_list *tjl; + struct reiserfs_journal_list *flush_jl; + unsigned int trans_id; + struct reiserfs_journal *journal = SB_JOURNAL(s); + + flush_jl = tjl = jl; + + /* in data logging mode, try harder to flush a lot of blocks */ + if (reiserfs_data_log(s)) + limit = 1024; + /* flush for 256 transactions or limit blocks, whichever comes first */ + for (i = 0; i < 256 && len < limit; i++) { + if (atomic_read(&tjl->j_commit_left) || + tjl->j_trans_id < jl->j_trans_id) { + break; + } + cur_len = atomic_read(&tjl->j_nonzerolen); + if (cur_len > 0) { + tjl->j_state &= ~LIST_TOUCHED; + } + len += cur_len; + flush_jl = tjl; + if (tjl->j_list.next == &journal->j_journal_list) + break; + tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next); + } + /* try to find a group of blocks we can flush across all the + ** transactions, but only bother if we've actually spanned + ** across multiple lists + */ + if (flush_jl != jl) { + ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i); + } + flush_journal_list(s, flush_jl, 1); + return 0; +} + +/* +** removes any nodes in table with name block and dev as bh. +** only touchs the hnext and hprev pointers. +*/ +void remove_journal_hash(struct super_block *sb, + struct reiserfs_journal_cnode **table, + struct reiserfs_journal_list *jl, + unsigned long block, int remove_freed) +{ + struct reiserfs_journal_cnode *cur; + struct reiserfs_journal_cnode **head; + + head = &(journal_hash(table, sb, block)); + if (!head) { + return; + } + cur = *head; + while (cur) { + if (cur->blocknr == block && cur->sb == sb + && (jl == NULL || jl == cur->jlist) + && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) { + if (cur->hnext) { + cur->hnext->hprev = cur->hprev; + } + if (cur->hprev) { + cur->hprev->hnext = cur->hnext; + } else { + *head = cur->hnext; + } + cur->blocknr = 0; + cur->sb = NULL; + cur->state = 0; + if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */ + atomic_dec(&(cur->jlist->j_nonzerolen)); + cur->bh = NULL; + cur->jlist = NULL; + } + cur = cur->hnext; + } +} + +static void free_journal_ram(struct super_block *sb) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + kfree(journal->j_current_jl); + journal->j_num_lists--; + + vfree(journal->j_cnode_free_orig); + free_list_bitmaps(sb, journal->j_list_bitmap); + free_bitmap_nodes(sb); /* must be after free_list_bitmaps */ + if (journal->j_header_bh) { + brelse(journal->j_header_bh); + } + /* j_header_bh is on the journal dev, make sure not to release the journal + * dev until we brelse j_header_bh + */ + release_journal_dev(sb, journal); + vfree(journal); +} + +/* +** call on unmount. Only set error to 1 if you haven't made your way out +** of read_super() yet. Any other caller must keep error at 0. +*/ +static int do_journal_release(struct reiserfs_transaction_handle *th, + struct super_block *sb, int error) +{ + struct reiserfs_transaction_handle myth; + int flushed = 0; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + + /* we only want to flush out transactions if we were called with error == 0 + */ + if (!error && !(sb->s_flags & MS_RDONLY)) { + /* end the current trans */ + BUG_ON(!th->t_trans_id); + do_journal_end(th, sb, 10, FLUSH_ALL); + + /* make sure something gets logged to force our way into the flush code */ + if (!journal_join(&myth, sb, 1)) { + reiserfs_prepare_for_journal(sb, + SB_BUFFER_WITH_SB(sb), + 1); + journal_mark_dirty(&myth, sb, + SB_BUFFER_WITH_SB(sb)); + do_journal_end(&myth, sb, 1, FLUSH_ALL); + flushed = 1; + } + } + + /* this also catches errors during the do_journal_end above */ + if (!error && reiserfs_is_journal_aborted(journal)) { + memset(&myth, 0, sizeof(myth)); + if (!journal_join_abort(&myth, sb, 1)) { + reiserfs_prepare_for_journal(sb, + SB_BUFFER_WITH_SB(sb), + 1); + journal_mark_dirty(&myth, sb, + SB_BUFFER_WITH_SB(sb)); + do_journal_end(&myth, sb, 1, FLUSH_ALL); + } + } + + reiserfs_mounted_fs_count--; + /* wait for all commits to finish */ + cancel_delayed_work(&SB_JOURNAL(sb)->j_work); + + /* + * We must release the write lock here because + * the workqueue job (flush_async_commit) needs this lock + */ + reiserfs_write_unlock(sb); + flush_workqueue(commit_wq); + + if (!reiserfs_mounted_fs_count) { + destroy_workqueue(commit_wq); + commit_wq = NULL; + } + + free_journal_ram(sb); + + reiserfs_write_lock(sb); + + return 0; +} + +/* +** call on unmount. flush all journal trans, release all alloc'd ram +*/ +int journal_release(struct reiserfs_transaction_handle *th, + struct super_block *sb) +{ + return do_journal_release(th, sb, 0); +} + +/* +** only call from an error condition inside reiserfs_read_super! +*/ +int journal_release_error(struct reiserfs_transaction_handle *th, + struct super_block *sb) +{ + return do_journal_release(th, sb, 1); +} + +/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */ +static int journal_compare_desc_commit(struct super_block *sb, + struct reiserfs_journal_desc *desc, + struct reiserfs_journal_commit *commit) +{ + if (get_commit_trans_id(commit) != get_desc_trans_id(desc) || + get_commit_trans_len(commit) != get_desc_trans_len(desc) || + get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max || + get_commit_trans_len(commit) <= 0) { + return 1; + } + return 0; +} + +/* returns 0 if it did not find a description block +** returns -1 if it found a corrupt commit block +** returns 1 if both desc and commit were valid +*/ +static int journal_transaction_is_valid(struct super_block *sb, + struct buffer_head *d_bh, + unsigned int *oldest_invalid_trans_id, + unsigned long *newest_mount_id) +{ + struct reiserfs_journal_desc *desc; + struct reiserfs_journal_commit *commit; + struct buffer_head *c_bh; + unsigned long offset; + + if (!d_bh) + return 0; + + desc = (struct reiserfs_journal_desc *)d_bh->b_data; + if (get_desc_trans_len(desc) > 0 + && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) { + if (oldest_invalid_trans_id && *oldest_invalid_trans_id + && get_desc_trans_id(desc) > *oldest_invalid_trans_id) { + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-986: transaction " + "is valid returning because trans_id %d is greater than " + "oldest_invalid %lu", + get_desc_trans_id(desc), + *oldest_invalid_trans_id); + return 0; + } + if (newest_mount_id + && *newest_mount_id > get_desc_mount_id(desc)) { + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1087: transaction " + "is valid returning because mount_id %d is less than " + "newest_mount_id %lu", + get_desc_mount_id(desc), + *newest_mount_id); + return -1; + } + if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) { + reiserfs_warning(sb, "journal-2018", + "Bad transaction length %d " + "encountered, ignoring transaction", + get_desc_trans_len(desc)); + return -1; + } + offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); + + /* ok, we have a journal description block, lets see if the transaction was valid */ + c_bh = + journal_bread(sb, + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + ((offset + get_desc_trans_len(desc) + + 1) % SB_ONDISK_JOURNAL_SIZE(sb))); + if (!c_bh) + return 0; + commit = (struct reiserfs_journal_commit *)c_bh->b_data; + if (journal_compare_desc_commit(sb, desc, commit)) { + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal_transaction_is_valid, commit offset %ld had bad " + "time %d or length %d", + c_bh->b_blocknr - + SB_ONDISK_JOURNAL_1st_BLOCK(sb), + get_commit_trans_id(commit), + get_commit_trans_len(commit)); + brelse(c_bh); + if (oldest_invalid_trans_id) { + *oldest_invalid_trans_id = + get_desc_trans_id(desc); + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1004: " + "transaction_is_valid setting oldest invalid trans_id " + "to %d", + get_desc_trans_id(desc)); + } + return -1; + } + brelse(c_bh); + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1006: found valid " + "transaction start offset %llu, len %d id %d", + d_bh->b_blocknr - + SB_ONDISK_JOURNAL_1st_BLOCK(sb), + get_desc_trans_len(desc), + get_desc_trans_id(desc)); + return 1; + } else { + return 0; + } +} + +static void brelse_array(struct buffer_head **heads, int num) +{ + int i; + for (i = 0; i < num; i++) { + brelse(heads[i]); + } +} + +/* +** given the start, and values for the oldest acceptable transactions, +** this either reads in a replays a transaction, or returns because the transaction +** is invalid, or too old. +*/ +static int journal_read_transaction(struct super_block *sb, + unsigned long cur_dblock, + unsigned long oldest_start, + unsigned int oldest_trans_id, + unsigned long newest_mount_id) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_journal_desc *desc; + struct reiserfs_journal_commit *commit; + unsigned int trans_id = 0; + struct buffer_head *c_bh; + struct buffer_head *d_bh; + struct buffer_head **log_blocks = NULL; + struct buffer_head **real_blocks = NULL; + unsigned int trans_offset; + int i; + int trans_half; + + d_bh = journal_bread(sb, cur_dblock); + if (!d_bh) + return 1; + desc = (struct reiserfs_journal_desc *)d_bh->b_data; + trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); + reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: " + "journal_read_transaction, offset %llu, len %d mount_id %d", + d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb), + get_desc_trans_len(desc), get_desc_mount_id(desc)); + if (get_desc_trans_id(desc) < oldest_trans_id) { + reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: " + "journal_read_trans skipping because %lu is too old", + cur_dblock - + SB_ONDISK_JOURNAL_1st_BLOCK(sb)); + brelse(d_bh); + return 1; + } + if (get_desc_mount_id(desc) != newest_mount_id) { + reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: " + "journal_read_trans skipping because %d is != " + "newest_mount_id %lu", get_desc_mount_id(desc), + newest_mount_id); + brelse(d_bh); + return 1; + } + c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + ((trans_offset + get_desc_trans_len(desc) + 1) % + SB_ONDISK_JOURNAL_SIZE(sb))); + if (!c_bh) { + brelse(d_bh); + return 1; + } + commit = (struct reiserfs_journal_commit *)c_bh->b_data; + if (journal_compare_desc_commit(sb, desc, commit)) { + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal_read_transaction, " + "commit offset %llu had bad time %d or length %d", + c_bh->b_blocknr - + SB_ONDISK_JOURNAL_1st_BLOCK(sb), + get_commit_trans_id(commit), + get_commit_trans_len(commit)); + brelse(c_bh); + brelse(d_bh); + return 1; + } + + if (bdev_read_only(sb->s_bdev)) { + reiserfs_warning(sb, "clm-2076", + "device is readonly, unable to replay log"); + brelse(c_bh); + brelse(d_bh); + return -EROFS; + } + + trans_id = get_desc_trans_id(desc); + /* now we know we've got a good transaction, and it was inside the valid time ranges */ + log_blocks = kmalloc(get_desc_trans_len(desc) * + sizeof(struct buffer_head *), GFP_NOFS); + real_blocks = kmalloc(get_desc_trans_len(desc) * + sizeof(struct buffer_head *), GFP_NOFS); + if (!log_blocks || !real_blocks) { + brelse(c_bh); + brelse(d_bh); + kfree(log_blocks); + kfree(real_blocks); + reiserfs_warning(sb, "journal-1169", + "kmalloc failed, unable to mount FS"); + return -1; + } + /* get all the buffer heads */ + trans_half = journal_trans_half(sb->s_blocksize); + for (i = 0; i < get_desc_trans_len(desc); i++) { + log_blocks[i] = + journal_getblk(sb, + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + (trans_offset + 1 + + i) % SB_ONDISK_JOURNAL_SIZE(sb)); + if (i < trans_half) { + real_blocks[i] = + sb_getblk(sb, + le32_to_cpu(desc->j_realblock[i])); + } else { + real_blocks[i] = + sb_getblk(sb, + le32_to_cpu(commit-> + j_realblock[i - trans_half])); + } + if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) { + reiserfs_warning(sb, "journal-1207", + "REPLAY FAILURE fsck required! " + "Block to replay is outside of " + "filesystem"); + goto abort_replay; + } + /* make sure we don't try to replay onto log or reserved area */ + if (is_block_in_log_or_reserved_area + (sb, real_blocks[i]->b_blocknr)) { + reiserfs_warning(sb, "journal-1204", + "REPLAY FAILURE fsck required! " + "Trying to replay onto a log block"); + abort_replay: + brelse_array(log_blocks, i); + brelse_array(real_blocks, i); + brelse(c_bh); + brelse(d_bh); + kfree(log_blocks); + kfree(real_blocks); + return -1; + } + } + /* read in the log blocks, memcpy to the corresponding real block */ + ll_rw_block(READ, get_desc_trans_len(desc), log_blocks); + for (i = 0; i < get_desc_trans_len(desc); i++) { + + reiserfs_write_unlock(sb); + wait_on_buffer(log_blocks[i]); + reiserfs_write_lock(sb); + + if (!buffer_uptodate(log_blocks[i])) { + reiserfs_warning(sb, "journal-1212", + "REPLAY FAILURE fsck required! " + "buffer write failed"); + brelse_array(log_blocks + i, + get_desc_trans_len(desc) - i); + brelse_array(real_blocks, get_desc_trans_len(desc)); + brelse(c_bh); + brelse(d_bh); + kfree(log_blocks); + kfree(real_blocks); + return -1; + } + memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, + real_blocks[i]->b_size); + set_buffer_uptodate(real_blocks[i]); + brelse(log_blocks[i]); + } + /* flush out the real blocks */ + for (i = 0; i < get_desc_trans_len(desc); i++) { + set_buffer_dirty(real_blocks[i]); + write_dirty_buffer(real_blocks[i], WRITE); + } + for (i = 0; i < get_desc_trans_len(desc); i++) { + wait_on_buffer(real_blocks[i]); + if (!buffer_uptodate(real_blocks[i])) { + reiserfs_warning(sb, "journal-1226", + "REPLAY FAILURE, fsck required! " + "buffer write failed"); + brelse_array(real_blocks + i, + get_desc_trans_len(desc) - i); + brelse(c_bh); + brelse(d_bh); + kfree(log_blocks); + kfree(real_blocks); + return -1; + } + brelse(real_blocks[i]); + } + cur_dblock = + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + ((trans_offset + get_desc_trans_len(desc) + + 2) % SB_ONDISK_JOURNAL_SIZE(sb)); + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1095: setting journal " "start to offset %ld", + cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb)); + + /* init starting values for the first transaction, in case this is the last transaction to be replayed. */ + journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb); + journal->j_last_flush_trans_id = trans_id; + journal->j_trans_id = trans_id + 1; + /* check for trans_id overflow */ + if (journal->j_trans_id == 0) + journal->j_trans_id = 10; + brelse(c_bh); + brelse(d_bh); + kfree(log_blocks); + kfree(real_blocks); + return 0; +} + +/* This function reads blocks starting from block and to max_block of bufsize + size (but no more than BUFNR blocks at a time). This proved to improve + mounting speed on self-rebuilding raid5 arrays at least. + Right now it is only used from journal code. But later we might use it + from other places. + Note: Do not use journal_getblk/sb_getblk functions here! */ +static struct buffer_head *reiserfs_breada(struct block_device *dev, + b_blocknr_t block, int bufsize, + b_blocknr_t max_block) +{ + struct buffer_head *bhlist[BUFNR]; + unsigned int blocks = BUFNR; + struct buffer_head *bh; + int i, j; + + bh = __getblk(dev, block, bufsize); + if (buffer_uptodate(bh)) + return (bh); + + if (block + BUFNR > max_block) { + blocks = max_block - block; + } + bhlist[0] = bh; + j = 1; + for (i = 1; i < blocks; i++) { + bh = __getblk(dev, block + i, bufsize); + if (buffer_uptodate(bh)) { + brelse(bh); + break; + } else + bhlist[j++] = bh; + } + ll_rw_block(READ, j, bhlist); + for (i = 1; i < j; i++) + brelse(bhlist[i]); + bh = bhlist[0]; + wait_on_buffer(bh); + if (buffer_uptodate(bh)) + return bh; + brelse(bh); + return NULL; +} + +/* +** read and replay the log +** on a clean unmount, the journal header's next unflushed pointer will be to an invalid +** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast. +** +** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid. +** +** On exit, it sets things up so the first transaction will work correctly. +*/ +static int journal_read(struct super_block *sb) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_journal_desc *desc; + unsigned int oldest_trans_id = 0; + unsigned int oldest_invalid_trans_id = 0; + time_t start; + unsigned long oldest_start = 0; + unsigned long cur_dblock = 0; + unsigned long newest_mount_id = 9; + struct buffer_head *d_bh; + struct reiserfs_journal_header *jh; + int valid_journal_header = 0; + int replay_count = 0; + int continue_replay = 1; + int ret; + char b[BDEVNAME_SIZE]; + + cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb); + reiserfs_info(sb, "checking transaction log (%s)\n", + bdevname(journal->j_dev_bd, b)); + start = get_seconds(); + + /* step 1, read in the journal header block. Check the transaction it says + ** is the first unflushed, and if that transaction is not valid, + ** replay is done + */ + journal->j_header_bh = journal_bread(sb, + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + SB_ONDISK_JOURNAL_SIZE(sb)); + if (!journal->j_header_bh) { + return 1; + } + jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data); + if (le32_to_cpu(jh->j_first_unflushed_offset) < + SB_ONDISK_JOURNAL_SIZE(sb) + && le32_to_cpu(jh->j_last_flush_trans_id) > 0) { + oldest_start = + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + le32_to_cpu(jh->j_first_unflushed_offset); + oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1; + newest_mount_id = le32_to_cpu(jh->j_mount_id); + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1153: found in " + "header: first_unflushed_offset %d, last_flushed_trans_id " + "%lu", le32_to_cpu(jh->j_first_unflushed_offset), + le32_to_cpu(jh->j_last_flush_trans_id)); + valid_journal_header = 1; + + /* now, we try to read the first unflushed offset. If it is not valid, + ** there is nothing more we can do, and it makes no sense to read + ** through the whole log. + */ + d_bh = + journal_bread(sb, + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + le32_to_cpu(jh->j_first_unflushed_offset)); + ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL); + if (!ret) { + continue_replay = 0; + } + brelse(d_bh); + goto start_log_replay; + } + + /* ok, there are transactions that need to be replayed. start with the first log block, find + ** all the valid transactions, and pick out the oldest. + */ + while (continue_replay + && cur_dblock < + (SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + SB_ONDISK_JOURNAL_SIZE(sb))) { + /* Note that it is required for blocksize of primary fs device and journal + device to be the same */ + d_bh = + reiserfs_breada(journal->j_dev_bd, cur_dblock, + sb->s_blocksize, + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + SB_ONDISK_JOURNAL_SIZE(sb)); + ret = + journal_transaction_is_valid(sb, d_bh, + &oldest_invalid_trans_id, + &newest_mount_id); + if (ret == 1) { + desc = (struct reiserfs_journal_desc *)d_bh->b_data; + if (oldest_start == 0) { /* init all oldest_ values */ + oldest_trans_id = get_desc_trans_id(desc); + oldest_start = d_bh->b_blocknr; + newest_mount_id = get_desc_mount_id(desc); + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1179: Setting " + "oldest_start to offset %llu, trans_id %lu", + oldest_start - + SB_ONDISK_JOURNAL_1st_BLOCK + (sb), oldest_trans_id); + } else if (oldest_trans_id > get_desc_trans_id(desc)) { + /* one we just read was older */ + oldest_trans_id = get_desc_trans_id(desc); + oldest_start = d_bh->b_blocknr; + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1180: Resetting " + "oldest_start to offset %lu, trans_id %lu", + oldest_start - + SB_ONDISK_JOURNAL_1st_BLOCK + (sb), oldest_trans_id); + } + if (newest_mount_id < get_desc_mount_id(desc)) { + newest_mount_id = get_desc_mount_id(desc); + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1299: Setting " + "newest_mount_id to %d", + get_desc_mount_id(desc)); + } + cur_dblock += get_desc_trans_len(desc) + 2; + } else { + cur_dblock++; + } + brelse(d_bh); + } + + start_log_replay: + cur_dblock = oldest_start; + if (oldest_trans_id) { + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1206: Starting replay " + "from offset %llu, trans_id %lu", + cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb), + oldest_trans_id); + + } + replay_count = 0; + while (continue_replay && oldest_trans_id > 0) { + ret = + journal_read_transaction(sb, cur_dblock, oldest_start, + oldest_trans_id, newest_mount_id); + if (ret < 0) { + return ret; + } else if (ret != 0) { + break; + } + cur_dblock = + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start; + replay_count++; + if (cur_dblock == oldest_start) + break; + } + + if (oldest_trans_id == 0) { + reiserfs_debug(sb, REISERFS_DEBUG_CODE, + "journal-1225: No valid " "transactions found"); + } + /* j_start does not get set correctly if we don't replay any transactions. + ** if we had a valid journal_header, set j_start to the first unflushed transaction value, + ** copy the trans_id from the header + */ + if (valid_journal_header && replay_count == 0) { + journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset); + journal->j_trans_id = + le32_to_cpu(jh->j_last_flush_trans_id) + 1; + /* check for trans_id overflow */ + if (journal->j_trans_id == 0) + journal->j_trans_id = 10; + journal->j_last_flush_trans_id = + le32_to_cpu(jh->j_last_flush_trans_id); + journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1; + } else { + journal->j_mount_id = newest_mount_id + 1; + } + reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " + "newest_mount_id to %lu", journal->j_mount_id); + journal->j_first_unflushed_offset = journal->j_start; + if (replay_count > 0) { + reiserfs_info(sb, + "replayed %d transactions in %lu seconds\n", + replay_count, get_seconds() - start); + } + if (!bdev_read_only(sb->s_bdev) && + _update_journal_header_block(sb, journal->j_start, + journal->j_last_flush_trans_id)) { + /* replay failed, caller must call free_journal_ram and abort + ** the mount + */ + return -1; + } + return 0; +} + +static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s) +{ + struct reiserfs_journal_list *jl; + jl = kzalloc(sizeof(struct reiserfs_journal_list), + GFP_NOFS | __GFP_NOFAIL); + INIT_LIST_HEAD(&jl->j_list); + INIT_LIST_HEAD(&jl->j_working_list); + INIT_LIST_HEAD(&jl->j_tail_bh_list); + INIT_LIST_HEAD(&jl->j_bh_list); + mutex_init(&jl->j_commit_mutex); + SB_JOURNAL(s)->j_num_lists++; + get_journal_list(jl); + return jl; +} + +static void journal_list_init(struct super_block *sb) +{ + SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb); +} + +static int release_journal_dev(struct super_block *super, + struct reiserfs_journal *journal) +{ + int result; + + result = 0; + + if (journal->j_dev_bd != NULL) { + if (journal->j_dev_bd->bd_dev != super->s_dev) + bd_release(journal->j_dev_bd); + result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode); + journal->j_dev_bd = NULL; + } + + if (result != 0) { + reiserfs_warning(super, "sh-457", + "Cannot release journal device: %i", result); + } + return result; +} + +static int journal_init_dev(struct super_block *super, + struct reiserfs_journal *journal, + const char *jdev_name) +{ + int result; + dev_t jdev; + fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE; + char b[BDEVNAME_SIZE]; + + result = 0; + + journal->j_dev_bd = NULL; + jdev = SB_ONDISK_JOURNAL_DEVICE(super) ? + new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev; + + if (bdev_read_only(super->s_bdev)) + blkdev_mode = FMODE_READ; + + /* there is no "jdev" option and journal is on separate device */ + if ((!jdev_name || !jdev_name[0])) { + journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode); + journal->j_dev_mode = blkdev_mode; + if (IS_ERR(journal->j_dev_bd)) { + result = PTR_ERR(journal->j_dev_bd); + journal->j_dev_bd = NULL; + reiserfs_warning(super, "sh-458", + "cannot init journal device '%s': %i", + __bdevname(jdev, b), result); + return result; + } else if (jdev != super->s_dev) { + result = bd_claim(journal->j_dev_bd, journal); + if (result) { + blkdev_put(journal->j_dev_bd, blkdev_mode); + return result; + } + + set_blocksize(journal->j_dev_bd, super->s_blocksize); + } + + return 0; + } + + journal->j_dev_mode = blkdev_mode; + journal->j_dev_bd = open_bdev_exclusive(jdev_name, + blkdev_mode, journal); + if (IS_ERR(journal->j_dev_bd)) { + result = PTR_ERR(journal->j_dev_bd); + journal->j_dev_bd = NULL; + reiserfs_warning(super, + "journal_init_dev: Cannot open '%s': %i", + jdev_name, result); + return result; + } + + set_blocksize(journal->j_dev_bd, super->s_blocksize); + reiserfs_info(super, + "journal_init_dev: journal device: %s\n", + bdevname(journal->j_dev_bd, b)); + return 0; +} + +/** + * When creating/tuning a file system user can assign some + * journal params within boundaries which depend on the ratio + * blocksize/standard_blocksize. + * + * For blocks >= standard_blocksize transaction size should + * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more + * then JOURNAL_TRANS_MAX_DEFAULT. + * + * For blocks < standard_blocksize these boundaries should be + * decreased proportionally. + */ +#define REISERFS_STANDARD_BLKSIZE (4096) + +static int check_advise_trans_params(struct super_block *sb, + struct reiserfs_journal *journal) +{ + if (journal->j_trans_max) { + /* Non-default journal params. + Do sanity check for them. */ + int ratio = 1; + if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE) + ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize; + + if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio || + journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio || + SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max < + JOURNAL_MIN_RATIO) { + reiserfs_warning(sb, "sh-462", + "bad transaction max size (%u). " + "FSCK?", journal->j_trans_max); + return 1; + } + if (journal->j_max_batch != (journal->j_trans_max) * + JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) { + reiserfs_warning(sb, "sh-463", + "bad transaction max batch (%u). " + "FSCK?", journal->j_max_batch); + return 1; + } + } else { + /* Default journal params. + The file system was created by old version + of mkreiserfs, so some fields contain zeros, + and we need to advise proper values for them */ + if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) { + reiserfs_warning(sb, "sh-464", "bad blocksize (%u)", + sb->s_blocksize); + return 1; + } + journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT; + journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT; + journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE; + } + return 0; +} + +/* +** must be called once on fs mount. calls journal_read for you +*/ +int journal_init(struct super_block *sb, const char *j_dev_name, + int old_format, unsigned int commit_max_age) +{ + int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2; + struct buffer_head *bhjh; + struct reiserfs_super_block *rs; + struct reiserfs_journal_header *jh; + struct reiserfs_journal *journal; + struct reiserfs_journal_list *jl; + char b[BDEVNAME_SIZE]; + int ret; + + /* + * Unlock here to avoid various RECLAIM-FS-ON <-> IN-RECLAIM-FS + * dependency inversion warnings. + */ + reiserfs_write_unlock(sb); + journal = SB_JOURNAL(sb) = vmalloc(sizeof(struct reiserfs_journal)); + if (!journal) { + reiserfs_warning(sb, "journal-1256", + "unable to get memory for journal structure"); + reiserfs_write_lock(sb); + return 1; + } + memset(journal, 0, sizeof(struct reiserfs_journal)); + INIT_LIST_HEAD(&journal->j_bitmap_nodes); + INIT_LIST_HEAD(&journal->j_prealloc_list); + INIT_LIST_HEAD(&journal->j_working_list); + INIT_LIST_HEAD(&journal->j_journal_list); + journal->j_persistent_trans = 0; + ret = reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap, + reiserfs_bmap_count(sb)); + reiserfs_write_lock(sb); + if (ret) + goto free_and_return; + + allocate_bitmap_nodes(sb); + + /* reserved for journal area support */ + SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ? + REISERFS_OLD_DISK_OFFSET_IN_BYTES + / sb->s_blocksize + + reiserfs_bmap_count(sb) + + 1 : + REISERFS_DISK_OFFSET_IN_BYTES / + sb->s_blocksize + 2); + + /* Sanity check to see is the standard journal fitting withing first bitmap + (actual for small blocksizes) */ + if (!SB_ONDISK_JOURNAL_DEVICE(sb) && + (SB_JOURNAL_1st_RESERVED_BLOCK(sb) + + SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) { + reiserfs_warning(sb, "journal-1393", + "journal does not fit for area addressed " + "by first of bitmap blocks. It starts at " + "%u and its size is %u. Block size %ld", + SB_JOURNAL_1st_RESERVED_BLOCK(sb), + SB_ONDISK_JOURNAL_SIZE(sb), + sb->s_blocksize); + goto free_and_return; + } + + /* + * We need to unlock here to avoid creating the following + * dependency: + * reiserfs_lock -> sysfs_mutex + * Because the reiserfs mmap path creates the following dependency: + * mm->mmap -> reiserfs_lock, hence we have + * mm->mmap -> reiserfs_lock ->sysfs_mutex + * This would ends up in a circular dependency with sysfs readdir path + * which does sysfs_mutex -> mm->mmap_sem + * This is fine because the reiserfs lock is useless in mount path, + * at least until we call journal_begin. We keep it for paranoid + * reasons. + */ + reiserfs_write_unlock(sb); + if (journal_init_dev(sb, journal, j_dev_name) != 0) { + reiserfs_write_lock(sb); + reiserfs_warning(sb, "sh-462", + "unable to initialize jornal device"); + goto free_and_return; + } + reiserfs_write_lock(sb); + + rs = SB_DISK_SUPER_BLOCK(sb); + + /* read journal header */ + bhjh = journal_bread(sb, + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + SB_ONDISK_JOURNAL_SIZE(sb)); + if (!bhjh) { + reiserfs_warning(sb, "sh-459", + "unable to read journal header"); + goto free_and_return; + } + jh = (struct reiserfs_journal_header *)(bhjh->b_data); + + /* make sure that journal matches to the super block */ + if (is_reiserfs_jr(rs) + && (le32_to_cpu(jh->jh_journal.jp_journal_magic) != + sb_jp_journal_magic(rs))) { + reiserfs_warning(sb, "sh-460", + "journal header magic %x (device %s) does " + "not match to magic found in super block %x", + jh->jh_journal.jp_journal_magic, + bdevname(journal->j_dev_bd, b), + sb_jp_journal_magic(rs)); + brelse(bhjh); + goto free_and_return; + } + + journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max); + journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch); + journal->j_max_commit_age = + le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age); + journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; + + if (check_advise_trans_params(sb, journal) != 0) + goto free_and_return; + journal->j_default_max_commit_age = journal->j_max_commit_age; + + if (commit_max_age != 0) { + journal->j_max_commit_age = commit_max_age; + journal->j_max_trans_age = commit_max_age; + } + + reiserfs_info(sb, "journal params: device %s, size %u, " + "journal first block %u, max trans len %u, max batch %u, " + "max commit age %u, max trans age %u\n", + bdevname(journal->j_dev_bd, b), + SB_ONDISK_JOURNAL_SIZE(sb), + SB_ONDISK_JOURNAL_1st_BLOCK(sb), + journal->j_trans_max, + journal->j_max_batch, + journal->j_max_commit_age, journal->j_max_trans_age); + + brelse(bhjh); + + journal->j_list_bitmap_index = 0; + journal_list_init(sb); + + memset(journal->j_list_hash_table, 0, + JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); + + INIT_LIST_HEAD(&journal->j_dirty_buffers); + spin_lock_init(&journal->j_dirty_buffers_lock); + + journal->j_start = 0; + journal->j_len = 0; + journal->j_len_alloc = 0; + atomic_set(&(journal->j_wcount), 0); + atomic_set(&(journal->j_async_throttle), 0); + journal->j_bcount = 0; + journal->j_trans_start_time = 0; + journal->j_last = NULL; + journal->j_first = NULL; + init_waitqueue_head(&(journal->j_join_wait)); + mutex_init(&journal->j_mutex); + mutex_init(&journal->j_flush_mutex); + + journal->j_trans_id = 10; + journal->j_mount_id = 10; + journal->j_state = 0; + atomic_set(&(journal->j_jlock), 0); + reiserfs_write_unlock(sb); + journal->j_cnode_free_list = allocate_cnodes(num_cnodes); + reiserfs_write_lock(sb); + journal->j_cnode_free_orig = journal->j_cnode_free_list; + journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0; + journal->j_cnode_used = 0; + journal->j_must_wait = 0; + + if (journal->j_cnode_free == 0) { + reiserfs_warning(sb, "journal-2004", "Journal cnode memory " + "allocation failed (%ld bytes). Journal is " + "too large for available memory. Usually " + "this is due to a journal that is too large.", + sizeof (struct reiserfs_journal_cnode) * num_cnodes); + goto free_and_return; + } + + init_journal_hash(sb); + jl = journal->j_current_jl; + jl->j_list_bitmap = get_list_bitmap(sb, jl); + if (!jl->j_list_bitmap) { + reiserfs_warning(sb, "journal-2005", + "get_list_bitmap failed for journal list 0"); + goto free_and_return; + } + if (journal_read(sb) < 0) { + reiserfs_warning(sb, "reiserfs-2006", + "Replay Failure, unable to mount"); + goto free_and_return; + } + + reiserfs_mounted_fs_count++; + if (reiserfs_mounted_fs_count <= 1) { + reiserfs_write_unlock(sb); + commit_wq = create_workqueue("reiserfs"); + reiserfs_write_lock(sb); + } + + INIT_DELAYED_WORK(&journal->j_work, flush_async_commits); + journal->j_work_sb = sb; + return 0; + free_and_return: + free_journal_ram(sb); + return 1; +} + +/* +** test for a polite end of the current transaction. Used by file_write, and should +** be used by delete to make sure they don't write more than can fit inside a single +** transaction +*/ +int journal_transaction_should_end(struct reiserfs_transaction_handle *th, + int new_alloc) +{ + struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); + time_t now = get_seconds(); + /* cannot restart while nested */ + BUG_ON(!th->t_trans_id); + if (th->t_refcount > 1) + return 0; + if (journal->j_must_wait > 0 || + (journal->j_len_alloc + new_alloc) >= journal->j_max_batch || + atomic_read(&(journal->j_jlock)) || + (now - journal->j_trans_start_time) > journal->j_max_trans_age || + journal->j_cnode_free < (journal->j_trans_max * 3)) { + return 1; + } + /* protected by the BKL here */ + journal->j_len_alloc += new_alloc; + th->t_blocks_allocated += new_alloc ; + return 0; +} + +/* this must be called inside a transaction, and requires the +** kernel_lock to be held +*/ +void reiserfs_block_writes(struct reiserfs_transaction_handle *th) +{ + struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); + BUG_ON(!th->t_trans_id); + journal->j_must_wait = 1; + set_bit(J_WRITERS_BLOCKED, &journal->j_state); + return; +} + +/* this must be called without a transaction started, and does not +** require BKL +*/ +void reiserfs_allow_writes(struct super_block *s) +{ + struct reiserfs_journal *journal = SB_JOURNAL(s); + clear_bit(J_WRITERS_BLOCKED, &journal->j_state); + wake_up(&journal->j_join_wait); +} + +/* this must be called without a transaction started, and does not +** require BKL +*/ +void reiserfs_wait_on_write_block(struct super_block *s) +{ + struct reiserfs_journal *journal = SB_JOURNAL(s); + wait_event(journal->j_join_wait, + !test_bit(J_WRITERS_BLOCKED, &journal->j_state)); +} + +static void queue_log_writer(struct super_block *s) +{ + wait_queue_t wait; + struct reiserfs_journal *journal = SB_JOURNAL(s); + set_bit(J_WRITERS_QUEUED, &journal->j_state); + + /* + * we don't want to use wait_event here because + * we only want to wait once. + */ + init_waitqueue_entry(&wait, current); + add_wait_queue(&journal->j_join_wait, &wait); + set_current_state(TASK_UNINTERRUPTIBLE); + if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) { + reiserfs_write_unlock(s); + schedule(); + reiserfs_write_lock(s); + } + __set_current_state(TASK_RUNNING); + remove_wait_queue(&journal->j_join_wait, &wait); +} + +static void wake_queued_writers(struct super_block *s) +{ + struct reiserfs_journal *journal = SB_JOURNAL(s); + if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state)) + wake_up(&journal->j_join_wait); +} + +static void let_transaction_grow(struct super_block *sb, unsigned int trans_id) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + unsigned long bcount = journal->j_bcount; + while (1) { + reiserfs_write_unlock(sb); + schedule_timeout_uninterruptible(1); + reiserfs_write_lock(sb); + journal->j_current_jl->j_state |= LIST_COMMIT_PENDING; + while ((atomic_read(&journal->j_wcount) > 0 || + atomic_read(&journal->j_jlock)) && + journal->j_trans_id == trans_id) { + queue_log_writer(sb); + } + if (journal->j_trans_id != trans_id) + break; + if (bcount == journal->j_bcount) + break; + bcount = journal->j_bcount; + } +} + +/* join == true if you must join an existing transaction. +** join == false if you can deal with waiting for others to finish +** +** this will block until the transaction is joinable. send the number of blocks you +** expect to use in nblocks. +*/ +static int do_journal_begin_r(struct reiserfs_transaction_handle *th, + struct super_block *sb, unsigned long nblocks, + int join) +{ + time_t now = get_seconds(); + unsigned int old_trans_id; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_transaction_handle myth; + int sched_count = 0; + int retval; + + reiserfs_check_lock_depth(sb, "journal_begin"); + BUG_ON(nblocks > journal->j_trans_max); + + PROC_INFO_INC(sb, journal.journal_being); + /* set here for journal_join */ + th->t_refcount = 1; + th->t_super = sb; + + relock: + lock_journal(sb); + if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) { + unlock_journal(sb); + retval = journal->j_errno; + goto out_fail; + } + journal->j_bcount++; + + if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) { + unlock_journal(sb); + reiserfs_write_unlock(sb); + reiserfs_wait_on_write_block(sb); + reiserfs_write_lock(sb); + PROC_INFO_INC(sb, journal.journal_relock_writers); + goto relock; + } + now = get_seconds(); + + /* if there is no room in the journal OR + ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning + ** we don't sleep if there aren't other writers + */ + + if ((!join && journal->j_must_wait > 0) || + (!join + && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch) + || (!join && atomic_read(&journal->j_wcount) > 0 + && journal->j_trans_start_time > 0 + && (now - journal->j_trans_start_time) > + journal->j_max_trans_age) || (!join + && atomic_read(&journal->j_jlock)) + || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) { + + old_trans_id = journal->j_trans_id; + unlock_journal(sb); /* allow others to finish this transaction */ + + if (!join && (journal->j_len_alloc + nblocks + 2) >= + journal->j_max_batch && + ((journal->j_len + nblocks + 2) * 100) < + (journal->j_len_alloc * 75)) { + if (atomic_read(&journal->j_wcount) > 10) { + sched_count++; + queue_log_writer(sb); + goto relock; + } + } + /* don't mess with joining the transaction if all we have to do is + * wait for someone else to do a commit + */ + if (atomic_read(&journal->j_jlock)) { + while (journal->j_trans_id == old_trans_id && + atomic_read(&journal->j_jlock)) { + queue_log_writer(sb); + } + goto relock; + } + retval = journal_join(&myth, sb, 1); + if (retval) + goto out_fail; + + /* someone might have ended the transaction while we joined */ + if (old_trans_id != journal->j_trans_id) { + retval = do_journal_end(&myth, sb, 1, 0); + } else { + retval = do_journal_end(&myth, sb, 1, COMMIT_NOW); + } + + if (retval) + goto out_fail; + + PROC_INFO_INC(sb, journal.journal_relock_wcount); + goto relock; + } + /* we are the first writer, set trans_id */ + if (journal->j_trans_start_time == 0) { + journal->j_trans_start_time = get_seconds(); + } + atomic_inc(&(journal->j_wcount)); + journal->j_len_alloc += nblocks; + th->t_blocks_logged = 0; + th->t_blocks_allocated = nblocks; + th->t_trans_id = journal->j_trans_id; + unlock_journal(sb); + INIT_LIST_HEAD(&th->t_list); + get_fs_excl(); + return 0; + + out_fail: + memset(th, 0, sizeof(*th)); + /* Re-set th->t_super, so we can properly keep track of how many + * persistent transactions there are. We need to do this so if this + * call is part of a failed restart_transaction, we can free it later */ + th->t_super = sb; + return retval; +} + +struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct + super_block + *s, + int nblocks) +{ + int ret; + struct reiserfs_transaction_handle *th; + + /* if we're nesting into an existing transaction. It will be + ** persistent on its own + */ + if (reiserfs_transaction_running(s)) { + th = current->journal_info; + th->t_refcount++; + BUG_ON(th->t_refcount < 2); + + return th; + } + th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS); + if (!th) + return NULL; + ret = journal_begin(th, s, nblocks); + if (ret) { + kfree(th); + return NULL; + } + + SB_JOURNAL(s)->j_persistent_trans++; + return th; +} + +int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th) +{ + struct super_block *s = th->t_super; + int ret = 0; + if (th->t_trans_id) + ret = journal_end(th, th->t_super, th->t_blocks_allocated); + else + ret = -EIO; + if (th->t_refcount == 0) { + SB_JOURNAL(s)->j_persistent_trans--; + kfree(th); + } + return ret; +} + +static int journal_join(struct reiserfs_transaction_handle *th, + struct super_block *sb, unsigned long nblocks) +{ + struct reiserfs_transaction_handle *cur_th = current->journal_info; + + /* this keeps do_journal_end from NULLing out the current->journal_info + ** pointer + */ + th->t_handle_save = cur_th; + BUG_ON(cur_th && cur_th->t_refcount > 1); + return do_journal_begin_r(th, sb, nblocks, JBEGIN_JOIN); +} + +int journal_join_abort(struct reiserfs_transaction_handle *th, + struct super_block *sb, unsigned long nblocks) +{ + struct reiserfs_transaction_handle *cur_th = current->journal_info; + + /* this keeps do_journal_end from NULLing out the current->journal_info + ** pointer + */ + th->t_handle_save = cur_th; + BUG_ON(cur_th && cur_th->t_refcount > 1); + return do_journal_begin_r(th, sb, nblocks, JBEGIN_ABORT); +} + +int journal_begin(struct reiserfs_transaction_handle *th, + struct super_block *sb, unsigned long nblocks) +{ + struct reiserfs_transaction_handle *cur_th = current->journal_info; + int ret; + + th->t_handle_save = NULL; + if (cur_th) { + /* we are nesting into the current transaction */ + if (cur_th->t_super == sb) { + BUG_ON(!cur_th->t_refcount); + cur_th->t_refcount++; + memcpy(th, cur_th, sizeof(*th)); + if (th->t_refcount <= 1) + reiserfs_warning(sb, "reiserfs-2005", + "BAD: refcount <= 1, but " + "journal_info != 0"); + return 0; + } else { + /* we've ended up with a handle from a different filesystem. + ** save it and restore on journal_end. This should never + ** really happen... + */ + reiserfs_warning(sb, "clm-2100", + "nesting info a different FS"); + th->t_handle_save = current->journal_info; + current->journal_info = th; + } + } else { + current->journal_info = th; + } + ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG); + BUG_ON(current->journal_info != th); + + /* I guess this boils down to being the reciprocal of clm-2100 above. + * If do_journal_begin_r fails, we need to put it back, since journal_end + * won't be called to do it. */ + if (ret) + current->journal_info = th->t_handle_save; + else + BUG_ON(!th->t_refcount); + + return ret; +} + +/* +** puts bh into the current transaction. If it was already there, reorders removes the +** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order). +** +** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the +** transaction is committed. +** +** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. +*/ +int journal_mark_dirty(struct reiserfs_transaction_handle *th, + struct super_block *sb, struct buffer_head *bh) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_journal_cnode *cn = NULL; + int count_already_incd = 0; + int prepared = 0; + BUG_ON(!th->t_trans_id); + + PROC_INFO_INC(sb, journal.mark_dirty); + if (th->t_trans_id != journal->j_trans_id) { + reiserfs_panic(th->t_super, "journal-1577", + "handle trans id %ld != current trans id %ld", + th->t_trans_id, journal->j_trans_id); + } + + sb->s_dirt = 1; + + prepared = test_clear_buffer_journal_prepared(bh); + clear_buffer_journal_restore_dirty(bh); + /* already in this transaction, we are done */ + if (buffer_journaled(bh)) { + PROC_INFO_INC(sb, journal.mark_dirty_already); + return 0; + } + + /* this must be turned into a panic instead of a warning. We can't allow + ** a dirty or journal_dirty or locked buffer to be logged, as some changes + ** could get to disk too early. NOT GOOD. + */ + if (!prepared || buffer_dirty(bh)) { + reiserfs_warning(sb, "journal-1777", + "buffer %llu bad state " + "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT", + (unsigned long long)bh->b_blocknr, + prepared ? ' ' : '!', + buffer_locked(bh) ? ' ' : '!', + buffer_dirty(bh) ? ' ' : '!', + buffer_journal_dirty(bh) ? ' ' : '!'); + } + + if (atomic_read(&(journal->j_wcount)) <= 0) { + reiserfs_warning(sb, "journal-1409", + "returning because j_wcount was %d", + atomic_read(&(journal->j_wcount))); + return 1; + } + /* this error means I've screwed up, and we've overflowed the transaction. + ** Nothing can be done here, except make the FS readonly or panic. + */ + if (journal->j_len >= journal->j_trans_max) { + reiserfs_panic(th->t_super, "journal-1413", + "j_len (%lu) is too big", + journal->j_len); + } + + if (buffer_journal_dirty(bh)) { + count_already_incd = 1; + PROC_INFO_INC(sb, journal.mark_dirty_notjournal); + clear_buffer_journal_dirty(bh); + } + + if (journal->j_len > journal->j_len_alloc) { + journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT; + } + + set_buffer_journaled(bh); + + /* now put this guy on the end */ + if (!cn) { + cn = get_cnode(sb); + if (!cn) { + reiserfs_panic(sb, "journal-4", "get_cnode failed!"); + } + + if (th->t_blocks_logged == th->t_blocks_allocated) { + th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT; + journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT; + } + th->t_blocks_logged++; + journal->j_len++; + + cn->bh = bh; + cn->blocknr = bh->b_blocknr; + cn->sb = sb; + cn->jlist = NULL; + insert_journal_hash(journal->j_hash_table, cn); + if (!count_already_incd) { + get_bh(bh); + } + } + cn->next = NULL; + cn->prev = journal->j_last; + cn->bh = bh; + if (journal->j_last) { + journal->j_last->next = cn; + journal->j_last = cn; + } else { + journal->j_first = cn; + journal->j_last = cn; + } + return 0; +} + +int journal_end(struct reiserfs_transaction_handle *th, + struct super_block *sb, unsigned long nblocks) +{ + if (!current->journal_info && th->t_refcount > 1) + reiserfs_warning(sb, "REISER-NESTING", + "th NULL, refcount %d", th->t_refcount); + + if (!th->t_trans_id) { + WARN_ON(1); + return -EIO; + } + + th->t_refcount--; + if (th->t_refcount > 0) { + struct reiserfs_transaction_handle *cur_th = + current->journal_info; + + /* we aren't allowed to close a nested transaction on a different + ** filesystem from the one in the task struct + */ + BUG_ON(cur_th->t_super != th->t_super); + + if (th != cur_th) { + memcpy(current->journal_info, th, sizeof(*th)); + th->t_trans_id = 0; + } + return 0; + } else { + return do_journal_end(th, sb, nblocks, 0); + } +} + +/* removes from the current transaction, relsing and descrementing any counters. +** also files the removed buffer directly onto the clean list +** +** called by journal_mark_freed when a block has been deleted +** +** returns 1 if it cleaned and relsed the buffer. 0 otherwise +*/ +static int remove_from_transaction(struct super_block *sb, + b_blocknr_t blocknr, int already_cleaned) +{ + struct buffer_head *bh; + struct reiserfs_journal_cnode *cn; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + int ret = 0; + + cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); + if (!cn || !cn->bh) { + return ret; + } + bh = cn->bh; + if (cn->prev) { + cn->prev->next = cn->next; + } + if (cn->next) { + cn->next->prev = cn->prev; + } + if (cn == journal->j_first) { + journal->j_first = cn->next; + } + if (cn == journal->j_last) { + journal->j_last = cn->prev; + } + if (bh) + remove_journal_hash(sb, journal->j_hash_table, NULL, + bh->b_blocknr, 0); + clear_buffer_journaled(bh); /* don't log this one */ + + if (!already_cleaned) { + clear_buffer_journal_dirty(bh); + clear_buffer_dirty(bh); + clear_buffer_journal_test(bh); + put_bh(bh); + if (atomic_read(&(bh->b_count)) < 0) { + reiserfs_warning(sb, "journal-1752", + "b_count < 0"); + } + ret = 1; + } + journal->j_len--; + journal->j_len_alloc--; + free_cnode(sb, cn); + return ret; +} + +/* +** for any cnode in a journal list, it can only be dirtied of all the +** transactions that include it are committed to disk. +** this checks through each transaction, and returns 1 if you are allowed to dirty, +** and 0 if you aren't +** +** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log +** blocks for a given transaction on disk +** +*/ +static int can_dirty(struct reiserfs_journal_cnode *cn) +{ + struct super_block *sb = cn->sb; + b_blocknr_t blocknr = cn->blocknr; + struct reiserfs_journal_cnode *cur = cn->hprev; + int can_dirty = 1; + + /* first test hprev. These are all newer than cn, so any node here + ** with the same block number and dev means this node can't be sent + ** to disk right now. + */ + while (cur && can_dirty) { + if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb && + cur->blocknr == blocknr) { + can_dirty = 0; + } + cur = cur->hprev; + } + /* then test hnext. These are all older than cn. As long as they + ** are committed to the log, it is safe to write cn to disk + */ + cur = cn->hnext; + while (cur && can_dirty) { + if (cur->jlist && cur->jlist->j_len > 0 && + atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh && + cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) { + can_dirty = 0; + } + cur = cur->hnext; + } + return can_dirty; +} + +/* syncs the commit blocks, but does not force the real buffers to disk +** will wait until the current transaction is done/committed before returning +*/ +int journal_end_sync(struct reiserfs_transaction_handle *th, + struct super_block *sb, unsigned long nblocks) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + + BUG_ON(!th->t_trans_id); + /* you can sync while nested, very, very bad */ + BUG_ON(th->t_refcount > 1); + if (journal->j_len == 0) { + reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), + 1); + journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb)); + } + return do_journal_end(th, sb, nblocks, COMMIT_NOW | WAIT); +} + +/* +** writeback the pending async commits to disk +*/ +static void flush_async_commits(struct work_struct *work) +{ + struct reiserfs_journal *journal = + container_of(work, struct reiserfs_journal, j_work.work); + struct super_block *sb = journal->j_work_sb; + struct reiserfs_journal_list *jl; + struct list_head *entry; + + reiserfs_write_lock(sb); + if (!list_empty(&journal->j_journal_list)) { + /* last entry is the youngest, commit it and you get everything */ + entry = journal->j_journal_list.prev; + jl = JOURNAL_LIST_ENTRY(entry); + flush_commit_list(sb, jl, 1); + } + reiserfs_write_unlock(sb); +} + +/* +** flushes any old transactions to disk +** ends the current transaction if it is too old +*/ +int reiserfs_flush_old_commits(struct super_block *sb) +{ + time_t now; + struct reiserfs_transaction_handle th; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + + now = get_seconds(); + /* safety check so we don't flush while we are replaying the log during + * mount + */ + if (list_empty(&journal->j_journal_list)) { + return 0; + } + + /* check the current transaction. If there are no writers, and it is + * too old, finish it, and force the commit blocks to disk + */ + if (atomic_read(&journal->j_wcount) <= 0 && + journal->j_trans_start_time > 0 && + journal->j_len > 0 && + (now - journal->j_trans_start_time) > journal->j_max_trans_age) { + if (!journal_join(&th, sb, 1)) { + reiserfs_prepare_for_journal(sb, + SB_BUFFER_WITH_SB(sb), + 1); + journal_mark_dirty(&th, sb, + SB_BUFFER_WITH_SB(sb)); + + /* we're only being called from kreiserfsd, it makes no sense to do + ** an async commit so that kreiserfsd can do it later + */ + do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT); + } + } + return sb->s_dirt; +} + +/* +** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit +** +** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all +** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just +** flushes the commit list and returns 0. +** +** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait. +** +** Note, we can't allow the journal_end to proceed while there are still writers in the log. +*/ +static int check_journal_end(struct reiserfs_transaction_handle *th, + struct super_block *sb, unsigned long nblocks, + int flags) +{ + + time_t now; + int flush = flags & FLUSH_ALL; + int commit_now = flags & COMMIT_NOW; + int wait_on_commit = flags & WAIT; + struct reiserfs_journal_list *jl; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + + BUG_ON(!th->t_trans_id); + + if (th->t_trans_id != journal->j_trans_id) { + reiserfs_panic(th->t_super, "journal-1577", + "handle trans id %ld != current trans id %ld", + th->t_trans_id, journal->j_trans_id); + } + + journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged); + if (atomic_read(&(journal->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */ + atomic_dec(&(journal->j_wcount)); + } + + /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released + ** will be dealt with by next transaction that actually writes something, but should be taken + ** care of in this trans + */ + BUG_ON(journal->j_len == 0); + + /* if wcount > 0, and we are called to with flush or commit_now, + ** we wait on j_join_wait. We will wake up when the last writer has + ** finished the transaction, and started it on its way to the disk. + ** Then, we flush the commit or journal list, and just return 0 + ** because the rest of journal end was already done for this transaction. + */ + if (atomic_read(&(journal->j_wcount)) > 0) { + if (flush || commit_now) { + unsigned trans_id; + + jl = journal->j_current_jl; + trans_id = jl->j_trans_id; + if (wait_on_commit) + jl->j_state |= LIST_COMMIT_PENDING; + atomic_set(&(journal->j_jlock), 1); + if (flush) { + journal->j_next_full_flush = 1; + } + unlock_journal(sb); + + /* sleep while the current transaction is still j_jlocked */ + while (journal->j_trans_id == trans_id) { + if (atomic_read(&journal->j_jlock)) { + queue_log_writer(sb); + } else { + lock_journal(sb); + if (journal->j_trans_id == trans_id) { + atomic_set(&(journal->j_jlock), + 1); + } + unlock_journal(sb); + } + } + BUG_ON(journal->j_trans_id == trans_id); + + if (commit_now + && journal_list_still_alive(sb, trans_id) + && wait_on_commit) { + flush_commit_list(sb, jl, 1); + } + return 0; + } + unlock_journal(sb); + return 0; + } + + /* deal with old transactions where we are the last writers */ + now = get_seconds(); + if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) { + commit_now = 1; + journal->j_next_async_flush = 1; + } + /* don't batch when someone is waiting on j_join_wait */ + /* don't batch when syncing the commit or flushing the whole trans */ + if (!(journal->j_must_wait > 0) && !(atomic_read(&(journal->j_jlock))) + && !flush && !commit_now && (journal->j_len < journal->j_max_batch) + && journal->j_len_alloc < journal->j_max_batch + && journal->j_cnode_free > (journal->j_trans_max * 3)) { + journal->j_bcount++; + unlock_journal(sb); + return 0; + } + + if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) { + reiserfs_panic(sb, "journal-003", + "j_start (%ld) is too high", + journal->j_start); + } + return 1; +} + +/* +** Does all the work that makes deleting blocks safe. +** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on. +** +** otherwise: +** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes +** before this transaction has finished. +** +** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with +** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash, +** the block can't be reallocated yet. +** +** Then remove it from the current transaction, decrementing any counters and filing it on the clean list. +*/ +int journal_mark_freed(struct reiserfs_transaction_handle *th, + struct super_block *sb, b_blocknr_t blocknr) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_journal_cnode *cn = NULL; + struct buffer_head *bh = NULL; + struct reiserfs_list_bitmap *jb = NULL; + int cleaned = 0; + BUG_ON(!th->t_trans_id); + + cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); + if (cn && cn->bh) { + bh = cn->bh; + get_bh(bh); + } + /* if it is journal new, we just remove it from this transaction */ + if (bh && buffer_journal_new(bh)) { + clear_buffer_journal_new(bh); + clear_prepared_bits(bh); + reiserfs_clean_and_file_buffer(bh); + cleaned = remove_from_transaction(sb, blocknr, cleaned); + } else { + /* set the bit for this block in the journal bitmap for this transaction */ + jb = journal->j_current_jl->j_list_bitmap; + if (!jb) { + reiserfs_panic(sb, "journal-1702", + "journal_list_bitmap is NULL"); + } + set_bit_in_list_bitmap(sb, blocknr, jb); + + /* Note, the entire while loop is not allowed to schedule. */ + + if (bh) { + clear_prepared_bits(bh); + reiserfs_clean_and_file_buffer(bh); + } + cleaned = remove_from_transaction(sb, blocknr, cleaned); + + /* find all older transactions with this block, make sure they don't try to write it out */ + cn = get_journal_hash_dev(sb, journal->j_list_hash_table, + blocknr); + while (cn) { + if (sb == cn->sb && blocknr == cn->blocknr) { + set_bit(BLOCK_FREED, &cn->state); + if (cn->bh) { + if (!cleaned) { + /* remove_from_transaction will brelse the buffer if it was + ** in the current trans + */ + clear_buffer_journal_dirty(cn-> + bh); + clear_buffer_dirty(cn->bh); + clear_buffer_journal_test(cn-> + bh); + cleaned = 1; + put_bh(cn->bh); + if (atomic_read + (&(cn->bh->b_count)) < 0) { + reiserfs_warning(sb, + "journal-2138", + "cn->bh->b_count < 0"); + } + } + if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */ + atomic_dec(& + (cn->jlist-> + j_nonzerolen)); + } + cn->bh = NULL; + } + } + cn = cn->hnext; + } + } + + if (bh) + release_buffer_page(bh); /* get_hash grabs the buffer */ + return 0; +} + +void reiserfs_update_inode_transaction(struct inode *inode) +{ + struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb); + REISERFS_I(inode)->i_jl = journal->j_current_jl; + REISERFS_I(inode)->i_trans_id = journal->j_trans_id; +} + +/* + * returns -1 on error, 0 if no commits/barriers were done and 1 + * if a transaction was actually committed and the barrier was done + */ +static int __commit_trans_jl(struct inode *inode, unsigned long id, + struct reiserfs_journal_list *jl) +{ + struct reiserfs_transaction_handle th; + struct super_block *sb = inode->i_sb; + struct reiserfs_journal *journal = SB_JOURNAL(sb); + int ret = 0; + + /* is it from the current transaction, or from an unknown transaction? */ + if (id == journal->j_trans_id) { + jl = journal->j_current_jl; + /* try to let other writers come in and grow this transaction */ + let_transaction_grow(sb, id); + if (journal->j_trans_id != id) { + goto flush_commit_only; + } + + ret = journal_begin(&th, sb, 1); + if (ret) + return ret; + + /* someone might have ended this transaction while we joined */ + if (journal->j_trans_id != id) { + reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), + 1); + journal_mark_dirty(&th, sb, SB_BUFFER_WITH_SB(sb)); + ret = journal_end(&th, sb, 1); + goto flush_commit_only; + } + + ret = journal_end_sync(&th, sb, 1); + if (!ret) + ret = 1; + + } else { + /* this gets tricky, we have to make sure the journal list in + * the inode still exists. We know the list is still around + * if we've got a larger transaction id than the oldest list + */ + flush_commit_only: + if (journal_list_still_alive(inode->i_sb, id)) { + /* + * we only set ret to 1 when we know for sure + * the barrier hasn't been started yet on the commit + * block. + */ + if (atomic_read(&jl->j_commit_left) > 1) + ret = 1; + flush_commit_list(sb, jl, 1); + if (journal->j_errno) + ret = journal->j_errno; + } + } + /* otherwise the list is gone, and long since committed */ + return ret; +} + +int reiserfs_commit_for_inode(struct inode *inode) +{ + unsigned int id = REISERFS_I(inode)->i_trans_id; + struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl; + + /* for the whole inode, assume unset id means it was + * changed in the current transaction. More conservative + */ + if (!id || !jl) { + reiserfs_update_inode_transaction(inode); + id = REISERFS_I(inode)->i_trans_id; + /* jl will be updated in __commit_trans_jl */ + } + + return __commit_trans_jl(inode, id, jl); +} + +void reiserfs_restore_prepared_buffer(struct super_block *sb, + struct buffer_head *bh) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + PROC_INFO_INC(sb, journal.restore_prepared); + if (!bh) { + return; + } + if (test_clear_buffer_journal_restore_dirty(bh) && + buffer_journal_dirty(bh)) { + struct reiserfs_journal_cnode *cn; + cn = get_journal_hash_dev(sb, + journal->j_list_hash_table, + bh->b_blocknr); + if (cn && can_dirty(cn)) { + set_buffer_journal_test(bh); + mark_buffer_dirty(bh); + } + } + clear_buffer_journal_prepared(bh); +} + +extern struct tree_balance *cur_tb; +/* +** before we can change a metadata block, we have to make sure it won't +** be written to disk while we are altering it. So, we must: +** clean it +** wait on it. +** +*/ +int reiserfs_prepare_for_journal(struct super_block *sb, + struct buffer_head *bh, int wait) +{ + PROC_INFO_INC(sb, journal.prepare); + + if (!trylock_buffer(bh)) { + if (!wait) + return 0; + lock_buffer(bh); + } + set_buffer_journal_prepared(bh); + if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) { + clear_buffer_journal_test(bh); + set_buffer_journal_restore_dirty(bh); + } + unlock_buffer(bh); + return 1; +} + +static void flush_old_journal_lists(struct super_block *s) +{ + struct reiserfs_journal *journal = SB_JOURNAL(s); + struct reiserfs_journal_list *jl; + struct list_head *entry; + time_t now = get_seconds(); + + while (!list_empty(&journal->j_journal_list)) { + entry = journal->j_journal_list.next; + jl = JOURNAL_LIST_ENTRY(entry); + /* this check should always be run, to send old lists to disk */ + if (jl->j_timestamp < (now - (JOURNAL_MAX_TRANS_AGE * 4)) && + atomic_read(&jl->j_commit_left) == 0 && + test_transaction(s, jl)) { + flush_used_journal_lists(s, jl); + } else { + break; + } + } +} + +/* +** long and ugly. If flush, will not return until all commit +** blocks and all real buffers in the trans are on disk. +** If no_async, won't return until all commit blocks are on disk. +** +** keep reading, there are comments as you go along +** +** If the journal is aborted, we just clean up. Things like flushing +** journal lists, etc just won't happen. +*/ +static int do_journal_end(struct reiserfs_transaction_handle *th, + struct super_block *sb, unsigned long nblocks, + int flags) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + struct reiserfs_journal_cnode *cn, *next, *jl_cn; + struct reiserfs_journal_cnode *last_cn = NULL; + struct reiserfs_journal_desc *desc; + struct reiserfs_journal_commit *commit; + struct buffer_head *c_bh; /* commit bh */ + struct buffer_head *d_bh; /* desc bh */ + int cur_write_start = 0; /* start index of current log write */ + int old_start; + int i; + int flush; + int wait_on_commit; + struct reiserfs_journal_list *jl, *temp_jl; + struct list_head *entry, *safe; + unsigned long jindex; + unsigned int commit_trans_id; + int trans_half; + + BUG_ON(th->t_refcount > 1); + BUG_ON(!th->t_trans_id); + + /* protect flush_older_commits from doing mistakes if the + transaction ID counter gets overflowed. */ + if (th->t_trans_id == ~0U) + flags |= FLUSH_ALL | COMMIT_NOW | WAIT; + flush = flags & FLUSH_ALL; + wait_on_commit = flags & WAIT; + + put_fs_excl(); + current->journal_info = th->t_handle_save; + reiserfs_check_lock_depth(sb, "journal end"); + if (journal->j_len == 0) { + reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), + 1); + journal_mark_dirty(th, sb, SB_BUFFER_WITH_SB(sb)); + } + + lock_journal(sb); + if (journal->j_next_full_flush) { + flags |= FLUSH_ALL; + flush = 1; + } + if (journal->j_next_async_flush) { + flags |= COMMIT_NOW | WAIT; + wait_on_commit = 1; + } + + /* check_journal_end locks the journal, and unlocks if it does not return 1 + ** it tells us if we should continue with the journal_end, or just return + */ + if (!check_journal_end(th, sb, nblocks, flags)) { + sb->s_dirt = 1; + wake_queued_writers(sb); + reiserfs_async_progress_wait(sb); + goto out; + } + + /* check_journal_end might set these, check again */ + if (journal->j_next_full_flush) { + flush = 1; + } + + /* + ** j must wait means we have to flush the log blocks, and the real blocks for + ** this transaction + */ + if (journal->j_must_wait > 0) { + flush = 1; + } +#ifdef REISERFS_PREALLOCATE + /* quota ops might need to nest, setup the journal_info pointer for them + * and raise the refcount so that it is > 0. */ + current->journal_info = th; + th->t_refcount++; + reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into + * the transaction */ + th->t_refcount--; + current->journal_info = th->t_handle_save; +#endif + + /* setup description block */ + d_bh = + journal_getblk(sb, + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + journal->j_start); + set_buffer_uptodate(d_bh); + desc = (struct reiserfs_journal_desc *)(d_bh)->b_data; + memset(d_bh->b_data, 0, d_bh->b_size); + memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8); + set_desc_trans_id(desc, journal->j_trans_id); + + /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */ + c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + ((journal->j_start + journal->j_len + + 1) % SB_ONDISK_JOURNAL_SIZE(sb))); + commit = (struct reiserfs_journal_commit *)c_bh->b_data; + memset(c_bh->b_data, 0, c_bh->b_size); + set_commit_trans_id(commit, journal->j_trans_id); + set_buffer_uptodate(c_bh); + + /* init this journal list */ + jl = journal->j_current_jl; + + /* we lock the commit before doing anything because + * we want to make sure nobody tries to run flush_commit_list until + * the new transaction is fully setup, and we've already flushed the + * ordered bh list + */ + reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb); + + /* save the transaction id in case we need to commit it later */ + commit_trans_id = jl->j_trans_id; + + atomic_set(&jl->j_older_commits_done, 0); + jl->j_trans_id = journal->j_trans_id; + jl->j_timestamp = journal->j_trans_start_time; + jl->j_commit_bh = c_bh; + jl->j_start = journal->j_start; + jl->j_len = journal->j_len; + atomic_set(&jl->j_nonzerolen, journal->j_len); + atomic_set(&jl->j_commit_left, journal->j_len + 2); + jl->j_realblock = NULL; + + /* The ENTIRE FOR LOOP MUST not cause schedule to occur. + ** for each real block, add it to the journal list hash, + ** copy into real block index array in the commit or desc block + */ + trans_half = journal_trans_half(sb->s_blocksize); + for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) { + if (buffer_journaled(cn->bh)) { + jl_cn = get_cnode(sb); + if (!jl_cn) { + reiserfs_panic(sb, "journal-1676", + "get_cnode returned NULL"); + } + if (i == 0) { + jl->j_realblock = jl_cn; + } + jl_cn->prev = last_cn; + jl_cn->next = NULL; + if (last_cn) { + last_cn->next = jl_cn; + } + last_cn = jl_cn; + /* make sure the block we are trying to log is not a block + of journal or reserved area */ + + if (is_block_in_log_or_reserved_area + (sb, cn->bh->b_blocknr)) { + reiserfs_panic(sb, "journal-2332", + "Trying to log block %lu, " + "which is a log block", + cn->bh->b_blocknr); + } + jl_cn->blocknr = cn->bh->b_blocknr; + jl_cn->state = 0; + jl_cn->sb = sb; + jl_cn->bh = cn->bh; + jl_cn->jlist = jl; + insert_journal_hash(journal->j_list_hash_table, jl_cn); + if (i < trans_half) { + desc->j_realblock[i] = + cpu_to_le32(cn->bh->b_blocknr); + } else { + commit->j_realblock[i - trans_half] = + cpu_to_le32(cn->bh->b_blocknr); + } + } else { + i--; + } + } + set_desc_trans_len(desc, journal->j_len); + set_desc_mount_id(desc, journal->j_mount_id); + set_desc_trans_id(desc, journal->j_trans_id); + set_commit_trans_len(commit, journal->j_len); + + /* special check in case all buffers in the journal were marked for not logging */ + BUG_ON(journal->j_len == 0); + + /* we're about to dirty all the log blocks, mark the description block + * dirty now too. Don't mark the commit block dirty until all the + * others are on disk + */ + mark_buffer_dirty(d_bh); + + /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */ + cur_write_start = journal->j_start; + cn = journal->j_first; + jindex = 1; /* start at one so we don't get the desc again */ + while (cn) { + clear_buffer_journal_new(cn->bh); + /* copy all the real blocks into log area. dirty log blocks */ + if (buffer_journaled(cn->bh)) { + struct buffer_head *tmp_bh; + char *addr; + struct page *page; + tmp_bh = + journal_getblk(sb, + SB_ONDISK_JOURNAL_1st_BLOCK(sb) + + ((cur_write_start + + jindex) % + SB_ONDISK_JOURNAL_SIZE(sb))); + set_buffer_uptodate(tmp_bh); + page = cn->bh->b_page; + addr = kmap(page); + memcpy(tmp_bh->b_data, + addr + offset_in_page(cn->bh->b_data), + cn->bh->b_size); + kunmap(page); + mark_buffer_dirty(tmp_bh); + jindex++; + set_buffer_journal_dirty(cn->bh); + clear_buffer_journaled(cn->bh); + } else { + /* JDirty cleared sometime during transaction. don't log this one */ + reiserfs_warning(sb, "journal-2048", + "BAD, buffer in journal hash, " + "but not JDirty!"); + brelse(cn->bh); + } + next = cn->next; + free_cnode(sb, cn); + cn = next; + reiserfs_write_unlock(sb); + cond_resched(); + reiserfs_write_lock(sb); + } + + /* we are done with both the c_bh and d_bh, but + ** c_bh must be written after all other commit blocks, + ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. + */ + + journal->j_current_jl = alloc_journal_list(sb); + + /* now it is safe to insert this transaction on the main list */ + list_add_tail(&jl->j_list, &journal->j_journal_list); + list_add_tail(&jl->j_working_list, &journal->j_working_list); + journal->j_num_work_lists++; + + /* reset journal values for the next transaction */ + old_start = journal->j_start; + journal->j_start = + (journal->j_start + journal->j_len + + 2) % SB_ONDISK_JOURNAL_SIZE(sb); + atomic_set(&(journal->j_wcount), 0); + journal->j_bcount = 0; + journal->j_last = NULL; + journal->j_first = NULL; + journal->j_len = 0; + journal->j_trans_start_time = 0; + /* check for trans_id overflow */ + if (++journal->j_trans_id == 0) + journal->j_trans_id = 10; + journal->j_current_jl->j_trans_id = journal->j_trans_id; + journal->j_must_wait = 0; + journal->j_len_alloc = 0; + journal->j_next_full_flush = 0; + journal->j_next_async_flush = 0; + init_journal_hash(sb); + + // make sure reiserfs_add_jh sees the new current_jl before we + // write out the tails + smp_mb(); + + /* tail conversion targets have to hit the disk before we end the + * transaction. Otherwise a later transaction might repack the tail + * before this transaction commits, leaving the data block unflushed and + * clean, if we crash before the later transaction commits, the data block + * is lost. + */ + if (!list_empty(&jl->j_tail_bh_list)) { + reiserfs_write_unlock(sb); + write_ordered_buffers(&journal->j_dirty_buffers_lock, + journal, jl, &jl->j_tail_bh_list); + reiserfs_write_lock(sb); + } + BUG_ON(!list_empty(&jl->j_tail_bh_list)); + mutex_unlock(&jl->j_commit_mutex); + + /* honor the flush wishes from the caller, simple commits can + ** be done outside the journal lock, they are done below + ** + ** if we don't flush the commit list right now, we put it into + ** the work queue so the people waiting on the async progress work + ** queue don't wait for this proc to flush journal lists and such. + */ + if (flush) { + flush_commit_list(sb, jl, 1); + flush_journal_list(sb, jl, 1); + } else if (!(jl->j_state & LIST_COMMIT_PENDING)) + queue_delayed_work(commit_wq, &journal->j_work, HZ / 10); + + /* if the next transaction has any chance of wrapping, flush + ** transactions that might get overwritten. If any journal lists are very + ** old flush them as well. + */ + first_jl: + list_for_each_safe(entry, safe, &journal->j_journal_list) { + temp_jl = JOURNAL_LIST_ENTRY(entry); + if (journal->j_start <= temp_jl->j_start) { + if ((journal->j_start + journal->j_trans_max + 1) >= + temp_jl->j_start) { + flush_used_journal_lists(sb, temp_jl); + goto first_jl; + } else if ((journal->j_start + + journal->j_trans_max + 1) < + SB_ONDISK_JOURNAL_SIZE(sb)) { + /* if we don't cross into the next transaction and we don't + * wrap, there is no way we can overlap any later transactions + * break now + */ + break; + } + } else if ((journal->j_start + + journal->j_trans_max + 1) > + SB_ONDISK_JOURNAL_SIZE(sb)) { + if (((journal->j_start + journal->j_trans_max + 1) % + SB_ONDISK_JOURNAL_SIZE(sb)) >= + temp_jl->j_start) { + flush_used_journal_lists(sb, temp_jl); + goto first_jl; + } else { + /* we don't overlap anything from out start to the end of the + * log, and our wrapped portion doesn't overlap anything at + * the start of the log. We can break + */ + break; + } + } + } + flush_old_journal_lists(sb); + + journal->j_current_jl->j_list_bitmap = + get_list_bitmap(sb, journal->j_current_jl); + + if (!(journal->j_current_jl->j_list_bitmap)) { + reiserfs_panic(sb, "journal-1996", + "could not get a list bitmap"); + } + + atomic_set(&(journal->j_jlock), 0); + unlock_journal(sb); + /* wake up any body waiting to join. */ + clear_bit(J_WRITERS_QUEUED, &journal->j_state); + wake_up(&(journal->j_join_wait)); + + if (!flush && wait_on_commit && + journal_list_still_alive(sb, commit_trans_id)) { + flush_commit_list(sb, jl, 1); + } + out: + reiserfs_check_lock_depth(sb, "journal end2"); + + memset(th, 0, sizeof(*th)); + /* Re-set th->t_super, so we can properly keep track of how many + * persistent transactions there are. We need to do this so if this + * call is part of a failed restart_transaction, we can free it later */ + th->t_super = sb; + + return journal->j_errno; +} + +/* Send the file system read only and refuse new transactions */ +void reiserfs_abort_journal(struct super_block *sb, int errno) +{ + struct reiserfs_journal *journal = SB_JOURNAL(sb); + if (test_bit(J_ABORTED, &journal->j_state)) + return; + + if (!journal->j_errno) + journal->j_errno = errno; + + sb->s_flags |= MS_RDONLY; + set_bit(J_ABORTED, &journal->j_state); + +#ifdef CONFIG_REISERFS_CHECK + dump_stack(); +#endif +} + |