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authorAndrew Morton <akpm@osdl.org>2006-08-05 12:14:25 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-08-06 08:57:47 -0700
commit60c371bc753495f36d3a71338b46030f7fffce3b (patch)
treeec83d5b3cc89efcea66310f3a1c6ca3708f6a26e /include/linux/debug_locks.h
parentbb39e419740435b7fbb0314e376ba468be7db67a (diff)
[PATCH] fadvise() make POSIX_FADV_NOREUSE a no-op
The POSIX_FADV_NOREUSE hint means "the application will use this range of the file a single time". It seems to be intended that the implementation will use this hint to perform drop-behind of that part of the file when the application gets around to reading or writing it. However for reasons which aren't obvious (or sane?) I mapped POSIX_FADV_NOREUSE onto POSIX_FADV_WILLNEED. ie: it does readahead. That's daft. So for now, make POSIX_FADV_NOREUSE a no-op. This is a non-back-compatible change. If someone was using POSIX_FADV_NOREUSE to perform readahead, they lose. The likelihood is low. If/when we later implement POSIX_FADV_NOREUSE things will get interesting - to do it fully we'll need to maintain file offset/length ranges and peform all sorts of complex tricks, and managing the lifetime of those ranges' data structures will be interesting.. A sensible implementation would probably ignore the file range and would simply mark the entire file as needing some form of drop-behind treatment. Cc: Michael Kerrisk <mtk-manpages@gmx.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/debug_locks.h')
0 files changed, 0 insertions, 0 deletions