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SYNC_FILE_RANGE_WRITE may and will block. Document that. 

[akpm@linux-foundation.org: fix comment text]
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Machek 2008-07-23 21:27:36 -07:00 committed by Linus Torvalds
parent bcd78e4961
commit cce7708158
1 changed files with 2 additions and 1 deletions
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fs/sync.c
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@ -139,7 +139,8 @@ asmlinkage long sys_fdatasync(unsigned int fd)
* before performing the write.
*
* SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
* range which are not presently under writeback.
* range which are not presently under writeback. Note that this may block for
* significant periods due to exhaustion of disk request structures.
*
* SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
* after performing the write.