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Vladimir V. Saveliev 6527c2bdf1 [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>
2006-06-27 17:32:39 -07:00
..
bootmem.c [PATCH] x86_64: Handle empty PXMs that only contain hotplug memory 2006-04-09 11:53:16 -07:00
fadvise.c [PATCH] sys_sync_file_range() 2006-03-31 12:18:54 -08:00
filemap.c [PATCH] generic_file_buffered_write(): deadlock on vectored write 2006-06-27 17:32:39 -07:00
filemap.h [PATCH] Prepare for __copy_from_user_inatomic to not zero missed bytes 2006-06-25 10:01:09 -07:00
filemap_xip.c [PATCH] replace inode_update_time with file_update_time 2006-01-10 08:01:30 -08:00
fremap.c [PATCH] fix update_mmu_cache in fremap.c 2006-06-23 07:42:52 -07:00
highmem.c BUG_ON() Conversion in mm/highmem.c 2006-04-02 13:47:35 +02:00
hugetlb.c [PATCH] tightening hugetlb strict accounting 2006-06-23 07:42:48 -07:00
internal.h [PATCH] remove set_page_count() outside mm/ 2006-03-22 07:54:02 -08:00
Kconfig [PATCH] sparc64: support sparsemem and !memory hotplug 2006-06-27 17:32:36 -07:00
madvise.c [PATCH] Fix MADV_REMOVE protection checking 2006-04-17 18:22:18 -07:00
Makefile [PATCH] uninline zone helpers 2006-03-27 08:44:48 -08:00
memory.c [PATCH] add page_mkwrite() vm_operations method 2006-06-23 07:42:51 -07:00
memory_hotplug.c [PATCH] Register sysfs file for hotplugged new node 2006-06-27 17:32:36 -07:00
mempolicy.c [PATCH] proc: don't lock task_structs indefinitely 2006-06-26 09:58:25 -07:00
mempool.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial 2006-03-26 09:41:18 -08:00
migrate.c [PATCH] Allow migration of mlocked pages 2006-06-25 10:00:55 -07:00
mincore.c [PATCH] freepgt: sys_mincore ignore FIRST_USER_PGD_NR 2005-04-19 13:29:20 -07:00
mlock.c [PATCH] move capable() to capability.h 2006-01-11 18:42:13 -08:00
mmap.c [PATCH] add page_mkwrite() vm_operations method 2006-06-23 07:42:51 -07:00
mmzone.c [PATCH] uninline zone helpers 2006-03-27 08:44:48 -08:00
mprotect.c [PATCH] add page_mkwrite() vm_operations method 2006-06-23 07:42:51 -07:00
mremap.c [PATCH] move capable() to capability.h 2006-01-11 18:42:13 -08:00
msync.c [PATCH] Kill PF_SYNCWRITE flag 2006-06-23 17:10:39 +02:00
nommu.c [PATCH] overcommit: use totalreserve_pages for nommu 2006-04-11 06:18:32 -07:00
oom_kill.c [PATCH] mm: fix typos in comments in mm/oom_kill.c 2006-06-23 07:42:47 -07:00
page-writeback.c [PATCH] writeback: fix range handling 2006-06-23 07:42:49 -07:00
page_alloc.c spelling fixes 2006-06-26 18:35:02 +02:00
page_io.c [PATCH] mm: split page table lock 2005-10-29 21:40:42 -07:00
pdflush.c [PATCH] pdflush: handle resume wakeups 2006-06-25 10:01:06 -07:00
prio_tree.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
readahead.c spelling fixes 2006-06-26 18:35:02 +02:00
rmap.c [PATCH] Allow migration of mlocked pages 2006-06-25 10:00:55 -07:00
shmem.c Merge branch 'master' of /home/trondmy/kernel/linux-2.6/ 2006-06-24 13:07:53 -04:00
slab.c [PATCH] add poison.h and patch primary users 2006-06-27 17:32:38 -07:00
slob.c [PATCH] mm/slob.c: for_each_possible_cpu(), not NR_CPUS 2006-04-19 09:13:49 -07:00
sparse.c [PATCH] spin/rwlock init cleanups 2006-06-27 17:32:39 -07:00
swap.c [PATCH] core: use list_move() 2006-06-26 09:58:17 -07:00
swap_state.c BUG_ON() Conversion in mm/swap_state.c 2006-04-01 01:25:12 +02:00
swapfile.c [PATCH] read_mapping_page for address space 2006-06-23 07:43:02 -07:00
thrash.c [PATCH] temporarily disable swap token on memory pressure 2005-11-28 14:42:25 -08:00
tiny-shmem.c [PATCH] do_truncate() call fix in tiny-shmem.c 2006-01-12 09:08:49 -08:00
truncate.c [PATCH] Remove semi-softlockup from invalidate_mapping_pages 2006-06-23 07:43:07 -07:00
util.c [PATCH] slab: optimize constant-size kzalloc calls 2006-03-25 08:22:49 -08:00
vmalloc.c [PATCH] mm: introduce remap_vmalloc_range() 2006-06-23 07:42:49 -07:00
vmscan.c [PATCH] pgdat allocation for new node add (export kswapd start func) 2006-06-27 17:32:36 -07:00