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authorAl Viro <viro@zeniv.linux.org.uk>2013-05-17 20:08:53 (GMT)
committerPawel Osmialowski <p.osmialowsk@mcdsrvbld02.digital.local>2015-03-27 13:37:36 (GMT)
commitb9838adf8e4776ef60f7d82741a6aaaa20f1d44d (patch)
treec8f6253ff425089894ca9c1ba88d7099b008faa5
parent0a577c7ab0b3f1e00ae22b398375b5423c252997 (diff)
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convert ext4
and trim the living hell out bogosities in inline dir case Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/ext4/dir.c158
-rw-r--r--fs/ext4/ext4.h2
-rw-r--r--fs/ext4/inline.c164
3 files changed, 134 insertions, 190 deletions
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index f8d56e4..3c7d288 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -29,8 +29,7 @@
#include "ext4.h"
#include "xattr.h"
-static int ext4_dx_readdir(struct file *filp,
- void *dirent, filldir_t filldir);
+static int ext4_dx_readdir(struct file *, struct dir_context *);
/**
* Check if the given dir-inode refers to an htree-indexed directory
@@ -103,60 +102,56 @@ int __ext4_check_dir_entry(const char *function, unsigned int line,
return 1;
}
-static int ext4_readdir(struct file *filp,
- void *dirent, filldir_t filldir)
+static int ext4_readdir(struct file *file, struct dir_context *ctx)
{
- int error = 0;
unsigned int offset;
int i, stored;
struct ext4_dir_entry_2 *de;
int err;
- struct inode *inode = file_inode(filp);
+ struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
- int ret = 0;
int dir_has_error = 0;
if (is_dx_dir(inode)) {
- err = ext4_dx_readdir(filp, dirent, filldir);
+ err = ext4_dx_readdir(file, ctx);
if (err != ERR_BAD_DX_DIR) {
- ret = err;
- goto out;
+ return err;
}
/*
* We don't set the inode dirty flag since it's not
* critical that it get flushed back to the disk.
*/
- ext4_clear_inode_flag(file_inode(filp),
+ ext4_clear_inode_flag(file_inode(file),
EXT4_INODE_INDEX);
}
if (ext4_has_inline_data(inode)) {
int has_inline_data = 1;
- ret = ext4_read_inline_dir(filp, dirent, filldir,
+ int ret = ext4_read_inline_dir(file, ctx,
&has_inline_data);
if (has_inline_data)
return ret;
}
stored = 0;
- offset = filp->f_pos & (sb->s_blocksize - 1);
+ offset = ctx->pos & (sb->s_blocksize - 1);
- while (!error && !stored && filp->f_pos < inode->i_size) {
+ while (ctx->pos < inode->i_size) {
struct ext4_map_blocks map;
struct buffer_head *bh = NULL;
- map.m_lblk = filp->f_pos >> EXT4_BLOCK_SIZE_BITS(sb);
+ map.m_lblk = ctx->pos >> EXT4_BLOCK_SIZE_BITS(sb);
map.m_len = 1;
err = ext4_map_blocks(NULL, inode, &map, 0);
if (err > 0) {
pgoff_t index = map.m_pblk >>
(PAGE_CACHE_SHIFT - inode->i_blkbits);
- if (!ra_has_index(&filp->f_ra, index))
+ if (!ra_has_index(&file->f_ra, index))
page_cache_sync_readahead(
sb->s_bdev->bd_inode->i_mapping,
- &filp->f_ra, filp,
+ &file->f_ra, file,
index, 1);
- filp->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT;
+ file->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT;
bh = ext4_bread(NULL, inode, map.m_lblk, 0, &err);
}
@@ -166,16 +161,16 @@ static int ext4_readdir(struct file *filp,
*/
if (!bh) {
if (!dir_has_error) {
- EXT4_ERROR_FILE(filp, 0,
+ EXT4_ERROR_FILE(file, 0,
"directory contains a "
"hole at offset %llu",
- (unsigned long long) filp->f_pos);
+ (unsigned long long) ctx->pos);
dir_has_error = 1;
}
/* corrupt size? Maybe no more blocks to read */
- if (filp->f_pos > inode->i_blocks << 9)
+ if (ctx->pos > inode->i_blocks << 9)
break;
- filp->f_pos += sb->s_blocksize - offset;
+ ctx->pos += sb->s_blocksize - offset;
continue;
}
@@ -183,21 +178,20 @@ static int ext4_readdir(struct file *filp,
if (!buffer_verified(bh) &&
!ext4_dirent_csum_verify(inode,
(struct ext4_dir_entry *)bh->b_data)) {
- EXT4_ERROR_FILE(filp, 0, "directory fails checksum "
+ EXT4_ERROR_FILE(file, 0, "directory fails checksum "
"at offset %llu",
- (unsigned long long)filp->f_pos);
- filp->f_pos += sb->s_blocksize - offset;
+ (unsigned long long)ctx->pos);
+ ctx->pos += sb->s_blocksize - offset;
brelse(bh);
continue;
}
set_buffer_verified(bh);
-revalidate:
/* If the dir block has changed since the last call to
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the block
* to make sure. */
- if (filp->f_version != inode->i_version) {
+ if (file->f_version != inode->i_version) {
for (i = 0; i < sb->s_blocksize && i < offset; ) {
de = (struct ext4_dir_entry_2 *)
(bh->b_data + i);
@@ -214,57 +208,46 @@ revalidate:
sb->s_blocksize);
}
offset = i;
- filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
+ ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1))
| offset;
- filp->f_version = inode->i_version;
+ file->f_version = inode->i_version;
}
- while (!error && filp->f_pos < inode->i_size
+ while (ctx->pos < inode->i_size
&& offset < sb->s_blocksize) {
de = (struct ext4_dir_entry_2 *) (bh->b_data + offset);
- if (ext4_check_dir_entry(inode, filp, de, bh,
+ if (ext4_check_dir_entry(inode, file, de, bh,
bh->b_data, bh->b_size,
offset)) {
/*
- * On error, skip the f_pos to the next block
+ * On error, skip to the next block
*/
- filp->f_pos = (filp->f_pos |
+ ctx->pos = (ctx->pos |
(sb->s_blocksize - 1)) + 1;
- brelse(bh);
- ret = stored;
- goto out;
+ break;
}
offset += ext4_rec_len_from_disk(de->rec_len,
sb->s_blocksize);
if (le32_to_cpu(de->inode)) {
- /* We might block in the next section
- * if the data destination is
- * currently swapped out. So, use a
- * version stamp to detect whether or
- * not the directory has been modified
- * during the copy operation.
- */
- u64 version = filp->f_version;
-
- error = filldir(dirent, de->name,
+ if (!dir_emit(ctx, de->name,
de->name_len,
- filp->f_pos,
le32_to_cpu(de->inode),
- get_dtype(sb, de->file_type));
- if (error)
- break;
- if (version != filp->f_version)
- goto revalidate;
- stored++;
+ get_dtype(sb, de->file_type))) {
+ brelse(bh);
+ return 0;
+ }
}
- filp->f_pos += ext4_rec_len_from_disk(de->rec_len,
+ ctx->pos += ext4_rec_len_from_disk(de->rec_len,
sb->s_blocksize);
}
offset = 0;
brelse(bh);
+ if (ctx->pos < inode->i_size) {
+ if (!dir_relax(inode))
+ return 0;
+ }
}
-out:
- return ret;
+ return 0;
}
static inline int is_32bit_api(void)
@@ -492,16 +475,12 @@ int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
* for all entres on the fname linked list. (Normally there is only
* one entry on the linked list, unless there are 62 bit hash collisions.)
*/
-static int call_filldir(struct file *filp, void *dirent,
- filldir_t filldir, struct fname *fname)
+static int call_filldir(struct file *file, struct dir_context *ctx,
+ struct fname *fname)
{
- struct dir_private_info *info = filp->private_data;
- loff_t curr_pos;
- struct inode *inode = file_inode(filp);
- struct super_block *sb;
- int error;
-
- sb = inode->i_sb;
+ struct dir_private_info *info = file->private_data;
+ struct inode *inode = file_inode(file);
+ struct super_block *sb = inode->i_sb;
if (!fname) {
ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: comm %s: "
@@ -509,47 +488,44 @@ static int call_filldir(struct file *filp, void *dirent,
inode->i_ino, current->comm);
return 0;
}
- curr_pos = hash2pos(filp, fname->hash, fname->minor_hash);
+ ctx->pos = hash2pos(file, fname->hash, fname->minor_hash);
while (fname) {
- error = filldir(dirent, fname->name,
- fname->name_len, curr_pos,
+ if (!dir_emit(ctx, fname->name,
+ fname->name_len,
fname->inode,
- get_dtype(sb, fname->file_type));
- if (error) {
- filp->f_pos = curr_pos;
+ get_dtype(sb, fname->file_type))) {
info->extra_fname = fname;
- return error;
+ return 1;
}
fname = fname->next;
}
return 0;
}
-static int ext4_dx_readdir(struct file *filp,
- void *dirent, filldir_t filldir)
+static int ext4_dx_readdir(struct file *file, struct dir_context *ctx)
{
- struct dir_private_info *info = filp->private_data;
- struct inode *inode = file_inode(filp);
+ struct dir_private_info *info = file->private_data;
+ struct inode *inode = file_inode(file);
struct fname *fname;
int ret;
if (!info) {
- info = ext4_htree_create_dir_info(filp, filp->f_pos);
+ info = ext4_htree_create_dir_info(file, ctx->pos);
if (!info)
return -ENOMEM;
- filp->private_data = info;
+ file->private_data = info;
}
- if (filp->f_pos == ext4_get_htree_eof(filp))
+ if (ctx->pos == ext4_get_htree_eof(file))
return 0; /* EOF */
/* Some one has messed with f_pos; reset the world */
- if (info->last_pos != filp->f_pos) {
+ if (info->last_pos != ctx->pos) {
free_rb_tree_fname(&info->root);
info->curr_node = NULL;
info->extra_fname = NULL;
- info->curr_hash = pos2maj_hash(filp, filp->f_pos);
- info->curr_minor_hash = pos2min_hash(filp, filp->f_pos);
+ info->curr_hash = pos2maj_hash(file, ctx->pos);
+ info->curr_minor_hash = pos2min_hash(file, ctx->pos);
}
/*
@@ -557,7 +533,7 @@ static int ext4_dx_readdir(struct file *filp,
* chain, return them first.
*/
if (info->extra_fname) {
- if (call_filldir(filp, dirent, filldir, info->extra_fname))
+ if (call_filldir(file, ctx, info->extra_fname))
goto finished;
info->extra_fname = NULL;
goto next_node;
@@ -571,17 +547,17 @@ static int ext4_dx_readdir(struct file *filp,
* cached entries.
*/
if ((!info->curr_node) ||
- (filp->f_version != inode->i_version)) {
+ (file->f_version != inode->i_version)) {
info->curr_node = NULL;
free_rb_tree_fname(&info->root);
- filp->f_version = inode->i_version;
- ret = ext4_htree_fill_tree(filp, info->curr_hash,
+ file->f_version = inode->i_version;
+ ret = ext4_htree_fill_tree(file, info->curr_hash,
info->curr_minor_hash,
&info->next_hash);
if (ret < 0)
return ret;
if (ret == 0) {
- filp->f_pos = ext4_get_htree_eof(filp);
+ ctx->pos = ext4_get_htree_eof(file);
break;
}
info->curr_node = rb_first(&info->root);
@@ -590,7 +566,7 @@ static int ext4_dx_readdir(struct file *filp,
fname = rb_entry(info->curr_node, struct fname, rb_hash);
info->curr_hash = fname->hash;
info->curr_minor_hash = fname->minor_hash;
- if (call_filldir(filp, dirent, filldir, fname))
+ if (call_filldir(file, ctx, fname))
break;
next_node:
info->curr_node = rb_next(info->curr_node);
@@ -601,7 +577,7 @@ static int ext4_dx_readdir(struct file *filp,
info->curr_minor_hash = fname->minor_hash;
} else {
if (info->next_hash == ~0) {
- filp->f_pos = ext4_get_htree_eof(filp);
+ ctx->pos = ext4_get_htree_eof(file);
break;
}
info->curr_hash = info->next_hash;
@@ -609,7 +585,7 @@ static int ext4_dx_readdir(struct file *filp,
}
}
finished:
- info->last_pos = filp->f_pos;
+ info->last_pos = ctx->pos;
return 0;
}
@@ -624,7 +600,7 @@ static int ext4_release_dir(struct inode *inode, struct file *filp)
const struct file_operations ext4_dir_operations = {
.llseek = ext4_dir_llseek,
.read = generic_read_dir,
- .readdir = ext4_readdir,
+ .iterate = ext4_readdir,
.unlocked_ioctl = ext4_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext4_compat_ioctl,
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index e4c4ac0..c9d1ba9 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2528,7 +2528,7 @@ extern int ext4_try_create_inline_dir(handle_t *handle,
struct inode *parent,
struct inode *inode);
extern int ext4_read_inline_dir(struct file *filp,
- void *dirent, filldir_t filldir,
+ struct dir_context *ctx,
int *has_inline_data);
extern int htree_inlinedir_to_tree(struct file *dir_file,
struct inode *dir, ext4_lblk_t block,
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index e350be6..bc1dd5b 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -1404,16 +1404,15 @@ out:
* offset as if '.' and '..' really take place.
*
*/
-int ext4_read_inline_dir(struct file *filp,
- void *dirent, filldir_t filldir,
+int ext4_read_inline_dir(struct file *file,
+ struct dir_context *ctx,
int *has_inline_data)
{
- int error = 0;
unsigned int offset, parent_ino;
- int i, stored;
+ int i;
struct ext4_dir_entry_2 *de;
struct super_block *sb;
- struct inode *inode = file_inode(filp);
+ struct inode *inode = file_inode(file);
int ret, inline_size = 0;
struct ext4_iloc iloc;
void *dir_buf = NULL;
@@ -1444,9 +1443,8 @@ int ext4_read_inline_dir(struct file *filp,
goto out;
sb = inode->i_sb;
- stored = 0;
parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
- offset = filp->f_pos;
+ offset = ctx->pos;
/*
* dotdot_offset and dotdot_size is the real offset and
@@ -1460,104 +1458,74 @@ int ext4_read_inline_dir(struct file *filp,
extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
extra_size = extra_offset + inline_size;
- while (!error && !stored && filp->f_pos < extra_size) {
-revalidate:
- /*
- * If the version has changed since the last call to
- * readdir(2), then we might be pointing to an invalid
- * dirent right now. Scan from the start of the inline
- * dir to make sure.
- */
- if (filp->f_version != inode->i_version) {
- for (i = 0; i < extra_size && i < offset;) {
- /*
- * "." is with offset 0 and
- * ".." is dotdot_offset.
- */
- if (!i) {
- i = dotdot_offset;
- continue;
- } else if (i == dotdot_offset) {
- i = dotdot_size;
- continue;
- }
- /* for other entry, the real offset in
- * the buf has to be tuned accordingly.
- */
- de = (struct ext4_dir_entry_2 *)
- (dir_buf + i - extra_offset);
- /* It's too expensive to do a full
- * dirent test each time round this
- * loop, but we do have to test at
- * least that it is non-zero. A
- * failure will be detected in the
- * dirent test below. */
- if (ext4_rec_len_from_disk(de->rec_len,
- extra_size) < EXT4_DIR_REC_LEN(1))
- break;
- i += ext4_rec_len_from_disk(de->rec_len,
- extra_size);
- }
- offset = i;
- filp->f_pos = offset;
- filp->f_version = inode->i_version;
- }
-
- while (!error && filp->f_pos < extra_size) {
- if (filp->f_pos == 0) {
- error = filldir(dirent, ".", 1, 0, inode->i_ino,
- DT_DIR);
- if (error)
- break;
- stored++;
- filp->f_pos = dotdot_offset;
+ /*
+ * If the version has changed since the last call to
+ * readdir(2), then we might be pointing to an invalid
+ * dirent right now. Scan from the start of the inline
+ * dir to make sure.
+ */
+ if (file->f_version != inode->i_version) {
+ for (i = 0; i < extra_size && i < offset;) {
+ /*
+ * "." is with offset 0 and
+ * ".." is dotdot_offset.
+ */
+ if (!i) {
+ i = dotdot_offset;
+ continue;
+ } else if (i == dotdot_offset) {
+ i = dotdot_size;
continue;
}
+ /* for other entry, the real offset in
+ * the buf has to be tuned accordingly.
+ */
+ de = (struct ext4_dir_entry_2 *)
+ (dir_buf + i - extra_offset);
+ /* It's too expensive to do a full
+ * dirent test each time round this
+ * loop, but we do have to test at
+ * least that it is non-zero. A
+ * failure will be detected in the
+ * dirent test below. */
+ if (ext4_rec_len_from_disk(de->rec_len, extra_size)
+ < EXT4_DIR_REC_LEN(1))
+ break;
+ i += ext4_rec_len_from_disk(de->rec_len,
+ extra_size);
+ }
+ offset = i;
+ ctx->pos = offset;
+ file->f_version = inode->i_version;
+ }
- if (filp->f_pos == dotdot_offset) {
- error = filldir(dirent, "..", 2,
- dotdot_offset,
- parent_ino, DT_DIR);
- if (error)
- break;
- stored++;
+ while (ctx->pos < extra_size) {
+ if (ctx->pos == 0) {
+ if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
+ goto out;
+ ctx->pos = dotdot_offset;
+ continue;
+ }
- filp->f_pos = dotdot_size;
- continue;
- }
+ if (ctx->pos == dotdot_offset) {
+ if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
+ goto out;
+ ctx->pos = dotdot_size;
+ continue;
+ }
- de = (struct ext4_dir_entry_2 *)
- (dir_buf + filp->f_pos - extra_offset);
- if (ext4_check_dir_entry(inode, filp, de,
- iloc.bh, dir_buf,
- extra_size, filp->f_pos)) {
- ret = stored;
+ de = (struct ext4_dir_entry_2 *)
+ (dir_buf + ctx->pos - extra_offset);
+ if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
+ extra_size, ctx->pos))
+ goto out;
+ if (le32_to_cpu(de->inode)) {
+ if (!dir_emit(ctx, de->name, de->name_len,
+ le32_to_cpu(de->inode),
+ get_dtype(sb, de->file_type)))
goto out;
- }
- if (le32_to_cpu(de->inode)) {
- /* We might block in the next section
- * if the data destination is
- * currently swapped out. So, use a
- * version stamp to detect whether or
- * not the directory has been modified
- * during the copy operation.
- */
- u64 version = filp->f_version;
-
- error = filldir(dirent, de->name,
- de->name_len,
- filp->f_pos,
- le32_to_cpu(de->inode),
- get_dtype(sb, de->file_type));
- if (error)
- break;
- if (version != filp->f_version)
- goto revalidate;
- stored++;
- }
- filp->f_pos += ext4_rec_len_from_disk(de->rec_len,
- extra_size);
}
+ ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
}
out:
kfree(dir_buf);