aboutsummaryrefslogtreecommitdiff
path: root/scripts/conmakehash.c
diff options
context:
space:
mode:
authorVladimir V. Saveliev <vs@namesys.com>2006-06-27 02:53:57 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-27 17:32:39 -0700
commit6527c2bdf1f833cc18e8f42bd97973d583e4aa83 (patch)
tree737055ae276cdfa75e7b3e55a3ebdd1f88105606 /scripts/conmakehash.c
parent1c0f16e5cdff59f3b132a1b0c0d44a941f8813d2 (diff)
[PATCH] generic_file_buffered_write(): deadlock on vectored write
generic_file_buffered_write() prefaults in user pages in order to avoid deadlock on copying from the same page as write goes to. However, it looks like there is a problem when write is vectored: fault_in_pages_readable brings in current segment or its part (maxlen). OTOH, filemap_copy_from_user_iovec is called to copy number of bytes (bytes) which may exceed current segment, so filemap_copy_from_user_iovec switches to the next segment which is not brought in yet. Pagefault is generated. That causes the deadlock if pagefault is for the same page write goes to: page being written is locked and not uptodate, pagefault will deadlock trying to lock locked page. [akpm@osdl.org: somewhat rewritten] Cc: Neil Brown <neilb@suse.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'scripts/conmakehash.c')
0 files changed, 0 insertions, 0 deletions