redonkable/remarkable-linux
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remarkable-linux/mm
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Hugh Dickins a2646d1e6c [PATCH] holepunch: fix shmem_truncate_range punching too far 
Miklos Szeredi observes BUG_ON(!entry) in shmem_writepage() triggered in rare
circumstances, because shmem_truncate_range() erroneously removes partially
truncated directory pages at the end of the range: later reclaim on pages
pointing to these removed directories triggers the BUG.  Indeed, and it can
also cause data loss beyond the hole.

Fix this as in the patch proposed by Miklos, but distinguish between "limit"
(how far we need to search: ignore truncation's next_index optimization in the
holepunch case - if there are races it's more consistent to act on the whole
range specified) and "upper_limit" (how far we can free directory pages:
generally we must be careful to keep partially punched pages, but can relax at
end of file - i_size being held stable by i_mutex).

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Miklos Szeredi <mszeredi@suse.cs>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-03-29 08:22:25 -07:00
..
allocpercpu.c [PATCH] Allow NULL pointers in percpu_free 2006-12-07 08:39:22 -08:00
backing-dev.c [PATCH] nfs: fix congestion control 2007-03-16 19:25:05 -07:00
bootmem.c [PATCH] remove EXPORT_UNUSED_SYMBOL'ed symbols 2006-12-07 08:39:44 -08:00
bounce.c block: blk_max_pfn is somtimes wrong 2007-03-27 08:52:47 +02:00
fadvise.c [PATCH] mm: change uses of f_{dentry,vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
filemap.c [PATCH] dio: invalidate clean pages before dio write 2007-03-16 19:25:04 -07:00
filemap.h Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
filemap_xip.c [PATCH] mm: mremap correct rmap accounting 2007-01-30 08:33:32 -08:00
fremap.c [PATCH] mm: more rmap debugging 2006-12-22 08:55:49 -08:00
highmem.c [PATCH] Use ZVC for free_pages 2007-02-11 10:51:17 -08:00
hugetlb.c [PATCH] hugetlb: preserve hugetlb pte dirty state 2007-02-09 09:25:46 -08:00
internal.h
Kconfig [PATCH] Set CONFIG_ZONE_DMA for arches with GENERIC_ISA_DMA 2007-02-11 10:51:19 -08:00
madvise.c [PATCH] mm: fix madvise infinine loop 2007-03-16 19:25:04 -07:00
Makefile [PATCH] separate bdi congestion functions from queue congestion functions 2006-10-20 10:26:35 -07:00
memory.c [PATCH] Add NOPFN_REFAULT result from vm_ops->nopfn() 2007-02-12 09:48:27 -08:00
memory_hotplug.c [PATCH] Fix sparsemem on Cell 2007-01-11 18:18:20 -08:00
mempolicy.c [PATCH] Page migration: Fix vma flag checking 2007-03-05 07:57:51 -08:00
mempool.c [PATCH] Numerous fixes to kernel-doc info in source files. 2007-02-11 10:51:32 -08:00
migrate.c [PATCH] Page migration: Fix vma flag checking 2007-03-05 07:57:51 -08:00
mincore.c [PATCH] mincore: vma crossing fix 2007-02-15 09:57:03 -08:00
mlock.c [PATCH] mlock cleanup 2006-12-07 08:39:22 -08:00
mmap.c [PATCH] Bug in MM_RB debugging 2007-03-01 14:53:38 -08:00
mmzone.c [PATCH] remove EXPORT_UNUSED_SYMBOL'ed symbols 2006-12-07 08:39:44 -08:00
mprotect.c [PATCH] paravirt: lazy mmu mode hooks.patch 2006-10-01 00:39:33 -07:00
mremap.c [PATCH] mm: mremap correct rmap accounting 2007-01-30 08:33:32 -08:00
msync.c
nommu.c [PATCH] NOMMU: make SYSV SHM nattch work correctly 2007-03-22 19:39:06 -07:00
oom_kill.c [PATCH] oom fix: prevent oom from killing a process with children/sibling unkillable 2007-03-16 19:25:06 -07:00
page-writeback.c [PATCH] throttle_vm_writeout(): don't loop on GFP_NOFS and GFP_NOIO allocations 2007-03-01 14:53:38 -08:00
page_alloc.c [PATCH] Rename PG_checked to PG_owner_priv_1 2007-03-01 14:53:37 -08:00
page_io.c [PATCH] swsusp: use block device offsets to identify swap locations 2006-12-07 08:39:27 -08:00
pdflush.c [PATCH] Add include/linux/freezer.h and move definitions from sched.h 2006-12-07 08:39:27 -08:00
prio_tree.c
readahead.c [PATCH] Drop __get_zone_counts() 2007-02-11 10:51:18 -08:00
rmap.c [PATCH] adapt page_lock_anon_vma() to PREEMPT_RCU 2007-03-01 14:53:39 -08:00
shmem.c [PATCH] holepunch: fix shmem_truncate_range punching too far 2007-03-29 08:22:25 -07:00
shmem_acl.c [PATCH] Fix typos in mm/shmem_acl.c 2006-10-11 11:14:23 -07:00
slab.c [PATCH] kernel-doc fixes for 2.6.20-git15 (non-drivers) 2007-03-01 14:53:37 -08:00
slob.c [PATCH] MM: SLOB is broken by recent cleanup of slab.h 2006-12-30 10:56:42 -08:00
sparse.c [PATCH] numa node ids are int, page_to_nid and zone_to_nid should return int 2006-12-07 08:39:23 -08:00
swap.c [PATCH] hotplug CPU: clean up hotcpu_notifier() use 2006-12-07 08:39:39 -08:00
swap_state.c
swapfile.c [PATCH] swsusp: Do not fail if resume device is not set 2007-01-05 23:55:22 -08:00
thrash.c [PATCH] make mm/thrash.c:global_faults static 2006-12-07 08:39:22 -08:00
tiny-shmem.c [PATCH] mm/{,tiny-}shmem.c cleanups 2007-03-01 14:53:35 -08:00
truncate.c [PATCH] VM: invalidate_inode_pages2_range() should not exit early 2007-03-01 14:53:39 -08:00
util.c [PATCH] slab: clean up leak tracking ifdefs a little bit 2006-10-04 07:55:13 -07:00
vmalloc.c [PATCH] Numerous fixes to kernel-doc info in source files. 2007-02-11 10:51:32 -08:00
vmscan.c [PATCH] throttle_vm_writeout(): don't loop on GFP_NOFS and GFP_NOIO allocations 2007-03-01 14:53:38 -08:00
vmstat.c [PATCH] optional ZONE_DMA: optional ZONE_DMA in the VM 2007-02-11 10:51:18 -08:00