https://github.com/torvalds/linux
Revision f3ddbdc6267c32223035ea9bb8456a2d86f65ba1 authored by Nick Piggin on 05 May 2005, 23:15:45 UTC, committed by Linus Torvalds on 05 May 2005, 23:36:40 UTC
Fix a race where __block_prepare_write can leak out an in-flight read
against a bh if get_block returns an error.  This can lead to the page
becoming unlocked while the buffer is locked and the read still in flight.
__mpage_writepage BUGs on this condition.

BUG sighted on a 2-way Itanium2 system with 16K PAGE_SIZE running

	fsstress -v -d $DIR/tmp -n 1000 -p 1000 -l 2

where $DIR is a new ext2 filesystem with 4K blocks that is quite
small (causing get_block to fail often with -ENOSPC).

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent 3c8fad1
History
Tip revision: f3ddbdc6267c32223035ea9bb8456a2d86f65ba1 authored by Nick Piggin on 05 May 2005, 23:15:45 UTC
[PATCH] fix race in __block_prepare_write
Tip revision: f3ddbdc

README

back to top