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authorPavel Machek <pavel@suse.cz>2008-07-23 21:27:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:17 -0700
commitcce770815869e9209171d819dfde89bcc738ab62 (patch)
tree1a78a7d57ae8c429df15bed31275a3424b305eb5
parentbcd78e49613c41b5bed96fa288e983876f286a59 (diff)
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>
-rw-r--r--fs/sync.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/sync.c b/fs/sync.c
index 228e17b5e9e..2967562d416 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -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.