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2009-12-25nilfs2: Storage class should be before const qualifierTobias Klauser1-1/+1
The C99 specification states in section 6.11.5: The placement of a storage-class specifier other than at the beginning of the declaration specifiers in a declaration is an obsolescent feature. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-12-25nilfs2: trivial coding style fixJiro SEKIBA3-23/+29
This is a trivial style fix patch to mend errors/warnings reported by "checkpatch.pl --file". Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-12-17Revert "task_struct: make journal_info conditional"Linus Torvalds1-1/+0
This reverts commit e4c570c4cb7a95dbfafa3d016d2739bf3fdfe319, as requested by Alexey: "I think I gave a good enough arguments to not merge it. To iterate: * patch makes impossible to start using ext3 on EXT3_FS=n kernels without reboot. * this is done only for one pointer on task_struct" None of config options which define task_struct are tristate directly or effectively." Requested-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-16switch nilfs2 to deactivate_locked_super()Al Viro1-2/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-12-15task_struct: make journal_info conditionalHiroshi Shimamoto1-0/+1
journal_info in task_struct is used in journaling file system only. So introduce CONFIG_FS_JOURNAL_INFO and make it conditional. Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-11-30nilfs2: separate wait function from nilfs_segctor_writeRyusuke Konishi4-95/+165
This separates wait function for submitted logs from the write function nilfs_segctor_write(). A new list of segment buffers "sc_write_logs" is added to hold logs under writing, and double buffering is partially applied to hide io latency. At this point, the double buffering is disabled for blocksize < pagesize because page dirty flag is turned off during write and dirty buffers are not properly collected for pages crossing over segments. To receive full benefit of the double buffering, further refinement is needed to move the io wait outside the lock section of log writer. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-30nilfs2: add iterator for segment buffersRyusuke Konishi3-48/+66
This adds a few iterator functions for segment buffers to make it easy to handle multiple series of logs. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-30nilfs2: hide nilfs_write_info struct in segment buffer codeRyusuke Konishi3-49/+49
Hides nilfs_write_info struct and nilfs_segbuf_prepare_write function in segbuf.c to simplify the interface of nilfs_segbuf_write function. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-30nilfs2: relocate io status variables to segment bufferRyusuke Konishi3-50/+44
This moves io status variables in nilfs_write_info struct to nilfs_segment_buffer struct. This is a preparation to hide nilfs_write_info in segment buffer code. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-29nilfs2: do not return io error for bio allocation failureRyusuke Konishi1-9/+2
Previously, log writer had possibility to set an io error flag on segments even in case of memory allocation failure. This fixes the issue. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-29nilfs2: use list_splice_tail or list_splice_tail_initRyusuke Konishi3-4/+4
This applies list_splice_tail (or list_splice_tail_init) operation instead of list_splice (or list_splice_init, respectively) to append a new list to tail of an existing list. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-27nilfs2: replace mark_inode_dirty as nilfs_mark_inode_dirtyJiro SEKIBA3-20/+20
Replace mark_inode_dirty() as nilfs_mark_inode_dirty() to reduce deep function calls. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-27nilfs2: delete mark_inode_dirty in nilfs_delete_entryJiro SEKIBA2-2/+2
Delete mark_inode_dirty() in nilfs_delete_entry() to reduce duplicate mark_inode_dirty() calls both in nilfs_rename() and nilfs_delete_entry(). Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-27nilfs2: delete mark_inode_dirty in nilfs_commit_chunkJiro SEKIBA2-4/+2
Delete mark_inode_dirty() in nilfs_commit_chunk(), for callers of nilfs_commit_chunk() will call equivalent mark_inode_dirty() after calling nilfs_commit_chunk(). Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-27nilfs2: change return type of nilfs_commit_chunkJiro SEKIBA1-8/+8
change return type of nilfs_commit_chunk() as void from int, for nilfs_set_file_dirty() usually does not return error. This is an intermediate patch to reduce mark_inode_dirty() in nilfs_commit_chunk(). Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-27nilfs2: split nilfs_unlink as nilfs_do_unlink and nilfs_unlinkJiro SEKIBA1-10/+19
Split nilfs_unlink() to reduce nested transaction and duplicate mark_inode_dirty() calls when calling nilfs_unlink() from nilfs_rmdir(). nilfs_do_unlink() is an actual unlink functionality which is not in transaction and does not call mark_inode_dirty() for dentry argument. nilfs_unlink() is a wrapper function for do_nilfs_unlink() with transaction and mark_inode_dirty() for dentry argument. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-27nilfs2: delete redundant mark_inode_dirtyJiro SEKIBA1-4/+0
delete redundant mark_inode_dirty() calls Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-27nilfs2: expand inode_inc_link_count and inode_dec_link_countJiro SEKIBA1-17/+32
This is an intermidiate patch to reduce redandunt mark_inode_dirty() calls by calling inode_inc_link_count() and inode_dec_link_count() functions. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-27nilfs2: delete mark_inode_dirty from nilfs_set_linkJiro SEKIBA2-2/+3
Delete mark_inode_dirty() from nilfs_set_link() to reduce redundant mark_inode_dirty() calls in caller of nilfs_set_link(). Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-27nilfs2: delete mark_inode_dirty in nilfs_new_inodeJiro SEKIBA2-2/+1
It is redundant to call mark_inode_dirty() in nilfs_new_inode() because all caller of nilfs_new_inode() will call mark_inode_dirty() after calling nilfs_new_inode() directly or indirectly in transaction. Signed-off-by: Jiro SEKIBA <jir@unicus.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: add norecovery mount optionRyusuke Konishi2-3/+33
This adds "norecovery" mount option which disables temporal write access to read-only mounts or snapshots during mount/recovery. Without this option, write access will be even performed for those types of mounts; the temporal write access is needed to mount root file system read-only after an unclean shutdown. This option will be helpful when user wants to prevent any write access to the device. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Cc: Eric Sandeen <sandeen@redhat.com>
2009-11-20nilfs2: add helper to get if volume is in a valid stateRyusuke Konishi2-5/+11
This adds a helper function, nilfs_valid_fs() which returns if nilfs is in a valid state or not. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: move recovery completion into load_nilfs functionRyusuke Konishi2-56/+53
Although mount recovery of nilfs is integrated in load_nilfs() procedure, the completion of recovery was isolated from the procedure and performed at the end of the fill_super routine. This was somewhat confusing since the recovery is needed for the nilfs object, not for a super block instance. To resolve the inconsistency, this will integrate the recovery completion into load_nilfs(). Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: apply readahead for recovery on mountRyusuke Konishi1-7/+19
This inserts readahead in the recovery code. The readahead request is issued per segment while searching the latest super root block. This will shorten mount time after unclean unmount. A measurement shows the recovery time was reduced by more than 60 percent: e.g. real 0m11.586s -> 0m3.918s (x 2.96) Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: clean up get/put function of a segment usageRyusuke Konishi2-77/+0
This eliminates obsolete nilfs_get_sufile_get_segment_usage() and nilfs_set_sufile_segment_usage() from sufile. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: move routine to set segment usage into sufileRyusuke Konishi3-22/+49
This adds nilfs_sufile_set_segment_usage() function in sufile to replace direct access to the sufile metadata in log writer code. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: move routine marking segment usage dirty into sufileRyusuke Konishi3-17/+22
This adds nilfs_sufile_mark_dirty() function in sufile to replace nilfs_touch_segusage() function in log writer code. This is a preparation for the further cleanup which will move out low level sufile operations in the log writer. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: insert cache operation in palloc get block routinesRyusuke Konishi1-8/+54
This implements cache operation in get block routines of palloc code: nilfs_palloc_get_desc_block(), nilfs_palloc_get_bitmap_block(), and nilfs_palloc_get_entry_block(). This will complete the palloc cache. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: add palloc cache to ifileRyusuke Konishi1-1/+15
This adds the palloc cache to ifile. The palloc cache is allocated on the extended region of nilfs_mdt_info struct. The struct nilfs_ifile_info defines the extended on memory structure of ifile. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: flush palloc cache before manipulating data pages of GC datRyusuke Konishi1-0/+3
Data pages in gcdat metadata file (i.e. the secondary DAT for GC), are cleared or even moved back to the normal DAT when a shot of garbage collection was done. Buffer heads held by the palloc cache of gcdat must be cleared before these page cache manipulation. This adds nilfs_palloc_clear_cache() to ensure this. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: add palloc cache to datRyusuke Konishi1-2/+16
This adds the palloc cache to DAT file. The palloc cache is allocated on the extended region of nilfs_mdt_info struct. The struct nilfs_dat_info defines the extended on memory structure of DAT. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: add cache framework for persistent object allocatorRyusuke Konishi4-0/+52
This adds setup and cleanup routines of the persistent object allocator cache. According to ftrace analyses, accessing buffers of the DAT file suffers indispensable overhead many times. To mitigate the overhead, This introduce cache framework for the persistent object allocator (palloc) which the DAT file and ifile are using. struct nilfs_palloc_cache represents the cache object per metadata file using palloc. The cache is initialized through nilfs_palloc_setup_cache() and destroyed by nilfs_palloc_destroy_cache(); callers of the former function will be added to individual allocators of DAT and ifile on successive patches. nilfs_palloc_destroy_cache() will be called from nilfs_mdt_destroy() if the cache is attached to a metadata file. A companion function nilfs_palloc_clear_cache() is provided to allow releasing buffer head references independently with the cleanup task. This adjunctive function will be used before invalidating pages of metadata file with the cache. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: unfold nilfs_palloc_block_get_bitmap functionRyusuke Konishi1-15/+4
This expands a trivial address calculation in the function into its every callsite. This expansion improves readability of the callers. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: eliminate nilfs_btnode_get functionRyusuke Konishi3-24/+12
This removes the obsolete nilfs_btnode_get() function and makes nilfs_btree_get_block() directly call nilfs_btnode_submit_block(). This expansion will provide better opportunity for code optimization. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: remove newblk argument from nilfs_btnode_submit_blockRyusuke Konishi3-20/+6
This removes the obsolete argument from nilfs_btnode_submit_block(). This will complete separating a create function of btree node. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: use nilfs_btnode_create_block functionRyusuke Konishi2-11/+15
This displaces nilfs_btnode_get() use to create new btree node block with nilfs_btnode_create_block. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: separate function for creating new btree node blockRyusuke Konishi2-0/+28
Adds a separate routine for creating a btree node block. This is a preparation to reduce the depth of function calls during submitting btree node buffer. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: avoid readahead on metadata file for create modeRyusuke Konishi1-13/+15
This turns off readhead action of metadata file if nilfs_mdt_get_block function was called with a create flag. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: simplify nilfs_sufile_get_ncleansegs functionRyusuke Konishi3-38/+19
Previously, this function took an status code to return possible error codes. The ("nilfs2: add local variable to cache the number of clean segments") patch removed the possibility to return errors. So, this simplifies the function definition to make it directly return the number of clean segments. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: add local variable to cache the number of clean segmentsRyusuke Konishi1-10/+43
This makes it possible for sufile to get the number of clean segments faster. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: unfold nilfs_sufile_block_get_header functionRyusuke Konishi1-12/+3
This unfolds the nilfs_sufile_block_get_header() function for simplicity. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: hide nilfs_mdt_clear calls in nilfs_mdt_destroyRyusuke Konishi6-15/+5
This will hide a function call of nilfs_mdt_clear() in nilfs_mdt_destroy(). This ensures nilfs_mdt_destroy() to do cleanup jobs included in nilfs_mdt_clear(). Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: eliminate inlines to directly read/write inode of metadata filesRyusuke Konishi2-23/+6
Removes two inline functions: nilfs_mdt_read_inode_direct() and nilfs_mdt_write_inode_direct(). Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: separate read method of meta data files on super root blockRyusuke Konishi7-6/+39
Will displace nilfs_mdt_read_inode_direct function with an individual read method: nilfs_dat_read, nilfs_sufile_read, nilfs_cpfile_read. This provides the opportunity to initialize local variables of each metadata file after reading the inode. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: separate constructor of metadata filesRyusuke Konishi10-25/+89
This will displace nilfs_mdt_new() constructor with individual metadata file constructors like nilfs_dat_new(), new_sufile_new(), nilfs_cpfile_new(), and nilfs_ifile_new(). This makes it possible for each metadata file to have own intialization code. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: add size option of private object to metadata file allocatorRyusuke Konishi5-13/+24
This adds an optional "object size" argument to nilfs_mdt_new_common() function; the argument specifies the size of private object attached to a newly allocated metadata file inode. This will afford space to keep local variables for meta data files. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: move out mark_inode_dirty calls from bmap routinesRyusuke Konishi2-4/+3
Previously, nilfs_bmap_add_blocks() and nilfs_bmap_sub_blocks() called mark_inode_dirty() after they changed the number of data blocks. This moves these calls outside bmap outermost functions like nilfs_bmap_insert() or nilfs_bmap_truncate(). This will mitigate overhead for truncate or delete operation since they repeatedly remove set of blocks. Nearly 10 percent improvement was observed for removal of a large file: # dd if=/dev/zero of=/test/aaa bs=1M count=512 # time rm /test/aaa real 2.968s -> 2.705s Further optimization may be possible by eliminating these mark_inode_dirty() uses though I avoid mixing separate changes here. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: stop marking metadata inode dirty within btree operationsRyusuke Konishi1-6/+2
Since metadata file routines mark the inode dirty after they successfully changed bmap objects, nilfs_mdt_mark_dirty() calls in nilfs_bmap_add_blocks() and nilfs_bmap_sub_blocks() are redundant. This removes these overlapping calls from the bmap routines. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: remove buffer locking from btree codeRyusuke Konishi1-60/+0
lock_buffer() and unlock_buffer() uses in btree.c are eliminable because btree functions gain buffer heads through nilfs_btnode_get(), which never returns an on-the-fly buffer. Although nilfs_clear_dirty_page() and nilfs_copy_back_pages() in nilfs_commit_gcdat_inode() juggle btree node buffers of DAT, this is safe because these operations are protected by a log writer lock or the metadata file semaphore of DAT. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-11-20nilfs2: remove buffer locking in nilfs_mark_inode_dirtyRyusuke Konishi1-3/+0
This lock is eliminable because inodes on the buffer can be updated independently. Although a log writer also fills in bmap data on the on-disk inodes, this update is exclusively done by a log writer lock. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
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