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authorNeilBrown <neilb@suse.de>2007-02-16 01:28:38 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 08:14:01 -0800
commit29dbb3fc8020f025bc38b262ec494e19fd3eac02 (patch)
tree579877f8d80e04e0908253b782b8e58c742b3fe6 /fs/ecryptfs
parent3160a711ef754758e7f85ae371cf900252c1a392 (diff)
[PATCH] knfsd: stop NFSD writes from being broken into lots of little writes to filesystem
When NFSD receives a write request, the data is typically in a number of 1448 byte segments and writev is used to collect them together. Unfortunately, generic_file_buffered_write passes these to the filesystem one at a time, so an e.g. 32K over-write becomes a series of partial-page writes to each page, causing the filesystem to have to pre-read those pages - wasted effort. generic_file_buffered_write handles one segment of the vector at a time as it has to pre-fault in each segment to avoid deadlocks. When writing from kernel-space (and nfsd does) this is not an issue, so generic_file_buffered_write does not need to break and iovec from nfsd into little pieces. This patch avoids the splitting when get_fs is KERNEL_DS as it is from NFSd. This issue was introduced by commit 6527c2bdf1f833cc18e8f42bd97973d583e4aa83 Acked-by: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Norman Weathers <norman.r.weathers@conocophillips.com> Cc: Vladimir V. Saveliev <vs@namesys.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ecryptfs')
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