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fs: introduce write_begin, write_end, and perform_write aops

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These are intended to replace prepare_write and commit_write with more
flexible alternatives that are also able to avoid the buffered write
deadlock problems efficiently (which prepare_write is unable to do).

[mark.fasheh@oracle.com: API design contributions, code review and fixes]
[akpm@linux-foundation.org: various fixes]
[dmonakhov@sw.ru: new aop block_write_begin fix]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Dmitriy Monakhov <dmonakhov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin
2007-10-16 01:25:01 -07:00
committed by Linus Torvalds
parent 637aff46f9
commit afddba49d1
11 changed files with 575 additions and 206 deletions
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9
Documentation/filesystems/Locking
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@@ -178,15 +178,18 @@ prototypes:
locking rules:
All except set_page_dirty may block
BKL PageLocked(page)
BKL PageLocked(page) i_sem
writepage: no yes, unlocks (see below)
readpage: no yes, unlocks
sync_page: no maybe
writepages: no
set_page_dirty no no
readpages: no
prepare_write: no yes
commit_write: no yes
prepare_write: no yes yes
commit_write: no yes yes
write_begin: no locks the page yes
write_end: no yes, unlocks yes
perform_write: no n/a yes
bmap: yes
invalidatepage: no yes
releasepage: no yes