Andrew Morton 81b0c87133 [PATCH] generic_file_buffered_write(): handle zero-length iovec segments ...

The recent generic_file_write() deadlock fix caused
generic_file_buffered_write() to loop inifinitely when presented with a
zero-length iovec segment.  Fix.

Note that this fix deliberately avoids calling ->prepare_write(),
->commit_write() etc with a zero-length write.  This is because I don't trust
all filesystems to get that right.

This is a cautious approach, for 2.6.17.x.  For 2.6.18 we should just go ahead
and call ->prepare_write() and ->commit_write() with the zero length and fix
any broken filesystems.  So I'll make that change once this code is stabilised
and backported into 2.6.17.x.

The reason for preferring to call ->prepare_write() and ->commit_write() with
the zero-length segment: a zero-length segment _should_ be sufficiently
uncommon that this is the correct way of handling it.  We don't want to
optimise for poorly-written userspace at the expense of well-written
userspace.

Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Greg KH <greg@kroah.com>
Cc: <stable@kernel.org>
Cc: walt <wa1ter@myrealbox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2006-06-29 10:26:20 -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_xip.c

[PATCH] mark address_space_operations const

2006-06-28 14:59:04 -07:00

filemap.c

[PATCH] generic_file_buffered_write(): handle zero-length iovec segments

2006-06-29 10:26:20 -07:00

filemap.h

[PATCH] generic_file_buffered_write(): handle zero-length iovec segments

2006-06-29 10:26:20 -07:00

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_hotplug.c

[PATCH] Register sysfs file for hotplugged new node

2006-06-27 17:32:36 -07:00

memory.c

[PATCH] add page_mkwrite() vm_operations method

2006-06-23 07:42:51 -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_alloc.c

[PATCH] pi-futex: introduce debug_check_no_locks_freed()

2006-06-27 17:32:46 -07:00

page_io.c

[PATCH] mm: split page table lock

2005-10-29 21:40:42 -07:00

page-writeback.c

[PATCH] cpu hotplug: make cpu_notifier related notifier calls __cpuinit only

2006-06-27 17:32:41 -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

[PATCH] mark address_space_operations const

2006-06-28 14:59:04 -07:00

slab.c

[PATCH] pi-futex: rt mutex debug

2006-06-27 17:32:47 -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_state.c

[PATCH] mark address_space_operations const

2006-06-28 14:59:04 -07:00

swap.c

[PATCH] core: use list_move()

2006-06-26 09:58:17 -07:00

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] cpu hotplug: revert init patch submitted for 2.6.17

2006-06-27 17:32:40 -07:00