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2011-01-07fs: avoid inode RCU freeing for pseudo fsNick Piggin1-0/+6
Pseudo filesystems that don't put inode on RCU list or reachable by rcu-walk dentries do not need to RCU free their inodes. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: icache RCU free inodesNick Piggin1-1/+9
RCU free the struct inode. This will allow: - Subsequent store-free path walking patch. The inode must be consulted for permissions when walking, so an RCU inode reference is a must. - sb_inode_list_lock to be moved inside i_lock because sb list walkers who want to take i_lock no longer need to take sb_inode_list_lock to walk the list in the first place. This will simplify and optimize locking. - Could remove some nested trylock loops in dcache code - Could potentially simplify things a bit in VM land. Do not need to take the page lock to follow page->mapping. The downsides of this is the performance cost of using RCU. In a simple creat/unlink microbenchmark, performance drops by about 10% due to inability to reuse cache-hot slab objects. As iterations increase and RCU freeing starts kicking over, this increases to about 20%. In cases where inode lifetimes are longer (ie. many inodes may be allocated during the average life span of a single inode), a lot of this cache reuse is not applicable, so the regression caused by this patch is smaller. The cache-hot regression could largely be avoided by using SLAB_DESTROY_BY_RCU, however this adds some complexity to list walking and store-free path walking, so I prefer to implement this at a later date, if it is shown to be a win in real situations. I haven't found a regression in any non-micro benchmark so I doubt it will be a problem. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: use fast counters for vfs cachesNick Piggin1-7/+10
percpu_counter library generates quite nasty code, so unless you need to dynamically allocate counters or take fast approximate value, a simple per cpu set of counters is much better. The percpu_counter can never be made to work as well, because it has an indirection from pointer to percpu memory, and it can't use direct this_cpu_inc interfaces because it doesn't use static PER_CPU data, so code will always be worse. In the fastpath, it is the difference between this: incl %gs:nr_dentry # nr_dentry and this: movl percpu_counter_batch(%rip), %edx # percpu_counter_batch, movl $1, %esi #, movq $nr_dentry, %rdi #, call __percpu_counter_add # (plus I clobber registers) __percpu_counter_add: pushq %rbp # movq %rsp, %rbp #, subq $32, %rsp #, movq %rbx, -24(%rbp) #, movq %r12, -16(%rbp) #, movq %r13, -8(%rbp) #, movq %rdi, %rbx # fbc, fbc #APP # 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1 movq %gs:kernel_stack,%rax #, pfo_ret__ # 0 "" 2 #NO_APP incl -8124(%rax) # <variable>.preempt_count movq 32(%rdi), %r12 # <variable>.counters, tcp_ptr__ #APP # 78 "lib/percpu_counter.c" 1 add %gs:this_cpu_off, %r12 # this_cpu_off, tcp_ptr__ # 0 "" 2 #NO_APP movslq (%r12),%r13 #* tcp_ptr__, tmp73 movslq %edx,%rax # batch, batch addq %rsi, %r13 # amount, count cmpq %rax, %r13 # batch, count jge .L27 #, negl %edx # tmp76 movslq %edx,%rdx # tmp76, tmp77 cmpq %rdx, %r13 # tmp77, count jg .L28 #, .L27: movq %rbx, %rdi # fbc, call _raw_spin_lock # addq %r13, 8(%rbx) # count, <variable>.count movq %rbx, %rdi # fbc, movl $0, (%r12) #,* tcp_ptr__ call _raw_spin_unlock # .L29: #APP # 216 "/home/npiggin/usr/src/linux-2.6/arch/x86/include/asm/thread_info.h" 1 movq %gs:kernel_stack,%rax #, pfo_ret__ # 0 "" 2 #NO_APP decl -8124(%rax) # <variable>.preempt_count movq -8136(%rax), %rax #, D.14625 testb $8, %al #, D.14625 jne .L32 #, .L31: movq -24(%rbp), %rbx #, movq -16(%rbp), %r12 #, movq -8(%rbp), %r13 #, leave ret .p2align 4,,10 .p2align 3 .L28: movl %r13d, (%r12) # count,* jmp .L29 # .L32: call preempt_schedule # .p2align 4,,6 jmp .L31 # .size __percpu_counter_add, .-__percpu_counter_add .p2align 4,,15 Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07vfs: revert per-cpu nr_unused counters for dentry and inodesNick Piggin1-10/+7
The nr_unused counters count the number of objects on an LRU, and as such they are synchronized with LRU object insertion and removal and scanning, and protected under the LRU lock. Making it per-cpu does not actually get any concurrency improvements because of this lock, and summing the counter is much slower, and incrementing/decrementing it costs more code size and is slower too. These counters should stay per-LRU, which currently means global. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2010-10-26Merge branch 'for-linus' of ↵Linus Torvalds1-190/+336
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (52 commits) split invalidate_inodes() fs: skip I_FREEING inodes in writeback_sb_inodes fs: fold invalidate_list into invalidate_inodes fs: do not drop inode_lock in dispose_list fs: inode split IO and LRU lists fs: switch bdev inode bdi's correctly fs: fix buffer invalidation in invalidate_list fsnotify: use dget_parent smbfs: use dget_parent exportfs: use dget_parent fs: use RCU read side protection in d_validate fs: clean up dentry lru modification fs: split __shrink_dcache_sb fs: improve DCACHE_REFERENCED usage fs: use percpu counter for nr_dentry and nr_dentry_unused fs: simplify __d_free fs: take dcache_lock inside __d_path fs: do not assign default i_ino in new_inode fs: introduce a per-cpu last_ino allocator new helper: ihold() ...
2010-10-26IMA: move read counter into struct inodeEric Paris1-0/+1
IMA currently allocated an inode integrity structure for every inode in core. This stucture is about 120 bytes long. Most files however (especially on a system which doesn't make use of IMA) will never need any of this space. The problem is that if IMA is enabled we need to know information about the number of readers and the number of writers for every inode on the box. At the moment we collect that information in the per inode iint structure and waste the rest of the space. This patch moves those counters into the struct inode so we can eventually stop allocating an IMA integrity structure except when absolutely needed. This patch does the minimum needed to move the location of the data. Further cleanups, especially the location of counter updates, may still be possible. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-25split invalidate_inodes()Al Viro1-2/+44
Pull removal of fsnotify marks into generic_shutdown_super(). Split umount-time work into a new function - evict_inodes(). Make sure that invalidate_inodes() will be able to cope with I_FREEING once we change locking in iput(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: fold invalidate_list into invalidate_inodesChristoph Hellwig1-27/+16
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: do not drop inode_lock in dispose_listChristoph Hellwig1-18/+2
Despite the comment above it we can not safely drop the lock here. invalidate_list is called from many other places that just umount. Also switch to proper list macros now that we never drop the lock. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: inode split IO and LRU listsNick Piggin1-19/+34
The use of the same inode list structure (inode->i_list) for two different list constructs with different lifecycles and purposes makes it impossible to separate the locking of the different operations. Therefore, to enable the separation of the locking of the writeback and reclaim lists, split the inode->i_list into two separate lists dedicated to their specific tracking functions. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: fix buffer invalidation in invalidate_listChristoph Hellwig1-9/+7
We must not call invalidate_inode_buffers in invalidate_list unless the inode can be reclaimed. If we remove the buffer association of a busy inode fsync won't find the buffers anymore. As invalidate_inode_buffers is called from various others sources than umount this actually does matter in practice. While at it change the loop to a more natural form and remove the WARN_ON for I_NEW, wich we already tested a few lines above. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: do not assign default i_ino in new_inodeChristoph Hellwig1-2/+2
Instead of always assigning an increasing inode number in new_inode move the call to assign it into those callers that actually need it. For now callers that need it is estimated conservatively, that is the call is added to all filesystems that do not assign an i_ino by themselves. For a few more filesystems we can avoid assigning any inode number given that they aren't user visible, and for others it could be done lazily when an inode number is actually needed, but that's left for later patches. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: introduce a per-cpu last_ino allocatorEric Dumazet1-7/+38
new_inode() dirties a contended cache line to get increasing inode numbers. This limits performance on workloads that cause significant parallel inode allocation. Solve this problem by using a per_cpu variable fed by the shared last_ino in batches of 1024 allocations. This reduces contention on the shared last_ino, and give same spreading ino numbers than before (i.e. same wraparound after 2^32 allocations). Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25new helper: ihold()Al Viro1-0/+9
Clones an existing reference to inode; caller must already hold one. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: remove inode_add_to_list/__inode_add_to_listChristoph Hellwig1-38/+32
Split up inode_add_to_list/__inode_add_to_list. Locking for the two lists will be split soon so these helpers really don't buy us much anymore. The __ prefixes for the sb list helpers will go away soon, but until inode_lock is gone we'll need them to distinguish between the locked and unlocked variants. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: move i_count increments into find_inode/find_inode_fastChristoph Hellwig1-11/+6
Now that iunique is not abusing find_inode anymore we can move the i_ref increment back to where it belongs. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: Stop abusing find_inode_fast in iuniqueChristoph Hellwig1-5/+25
Stop abusing find_inode_fast for iunique and opencode the inode hash walk. Introduce a new iunique_lock to protect the iunique counters once inode_lock is removed. Based on a patch originally from Nick Piggin. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: Factor inode hash operations into functionsDave Chinner1-45/+55
Before replacing the inode hash locking with a more scalable mechanism, factor the removal of the inode from the hashes rather than open coding it in several places. Based on a patch originally from Nick Piggin. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: Implement lazy LRU updates for inodesNick Piggin1-26/+60
Convert the inode LRU to use lazy updates to reduce lock and cacheline traffic. We avoid moving inodes around in the LRU list during iget/iput operations so these frequent operations don't need to access the LRUs. Instead, we defer the refcount checks to reclaim-time and use a per-inode state flag, I_REFERENCED, to tell reclaim that iget has touched the inode in the past. This means that only reclaim should be touching the LRU with any frequency, hence significantly reducing lock acquisitions and the amount contention on LRU updates. This also removes the inode_in_use list, which means we now only have one list for tracking the inode LRU status. This makes it much simpler to split out the LRU list operations under it's own lock. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: Convert nr_inodes and nr_unused to per-cpu countersDave Chinner1-19/+45
The number of inodes allocated does not need to be tied to the addition or removal of an inode to/from a list. If we are not tied to a list lock, we could update the counters when inodes are initialised or destroyed, but to do that we need to convert the counters to be per-cpu (i.e. independent of a lock). This means that we have the freedom to change the list/locking implementation without needing to care about the counters. Based on a patch originally from Eric Dumazet. [AV: cleaned up a bit, fixed build breakage on weird configs Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25new helper: inode_unhashed()Al Viro1-3/+3
note: for race-free uses you inode_lock held Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25unexport invalidate_inodesAl Viro1-1/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25lockdep: fixup checking of dir inode annotationNamhyung Kim1-1/+1
Since inode->i_mode shares its bits for S_IFMT, S_ISDIR should be used to distinguish whether it is a dir or not. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-25fs: mark destroy_inode staticChristoph Hellwig1-1/+1
Hugetlbfs used to need it, but after the destroy_inode and evict_inode changes it's not required anymore. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-10Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notifyLinus Torvalds1-7/+1
* 'for-linus' of git://git.infradead.org/users/eparis/notify: (132 commits) fanotify: use both marks when possible fsnotify: pass both the vfsmount mark and inode mark fsnotify: walk the inode and vfsmount lists simultaneously fsnotify: rework ignored mark flushing fsnotify: remove global fsnotify groups lists fsnotify: remove group->mask fsnotify: remove the global masks fsnotify: cleanup should_send_event fanotify: use the mark in handler functions audit: use the mark in handler functions dnotify: use the mark in handler functions inotify: use the mark in handler functions fsnotify: send fsnotify_mark to groups in event handling functions fsnotify: Exchange list heads instead of moving elements fsnotify: srcu to protect read side of inode and vfsmount locks fsnotify: use an explicit flag to indicate fsnotify_destroy_mark has been called fsnotify: use _rcu functions for mark list traversal fsnotify: place marks on object in order of group memory address vfs/fsnotify: fsnotify_close can delay the final work in fput fsnotify: store struct file not struct path ... Fix up trivial delete/modify conflict in fs/notify/inotify/inotify.c.
2010-08-09All filesystems that need invalidate_inode_buffers() are doing that explicitlyAl Viro1-1/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09convert remaining ->clear_inode() to ->evict_inode()Al Viro1-2/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09Make ->drop_inode() just return whether inode needs to be droppedAl Viro1-79/+34
... and let iput_final() do the actual eviction or retention Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09fs/inode.c:clear_inode() is goneAl Viro1-24/+4
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09fs/inode.c:evict() doesn't care about delete vs. non-delete paths nowAl Viro1-4/+4
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09->delete_inode() is goneAl Viro1-2/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09new helper: end_writeback()Al Viro1-0/+12
Essentially, the minimal variant of ->evict_inode(). It's a trimmed-down clear_inode(), sans any fs callbacks. Once it returns we know that no async writeback will be happening; every ->evict_inode() instance should do that once and do that before doing anything ->write_inode() could interfere with (e.g. freeing the on-disk inode). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09Take ->i_bdev/->i_cdev handling out of clear_inode()Al Viro1-4/+4
All call chains to clear_inode() pass through evict_inode() and clear_inode() should be called by evict_inode() exactly once. So we can pull i_bdev/i_cdev detaching up to evict_inode() itself. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09generic_detach_inode() can be static nowAl Viro1-2/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09New method - evict_inode()Al Viro1-1/+3
Hybrid of ->clear_inode() and ->delete_inode(); if present, does all fs work to be done when in-core inode is about to be gone, for whatever reason. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09unify fs/inode.c callers of clear_inode()Al Viro1-19/+17
For now, just a straightforward merge Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09simplify checks for I_CLEAR/I_FREEINGAl Viro1-8/+8
add I_CLEAR instead of replacing I_FREEING with it. I_CLEAR is equivalent to I_FREEING for almost all code looking at either; it's there to keep track of having called clear_inode() exactly once per inode lifetime, at some point after having set I_FREEING. I_CLEAR and I_FREEING never get set at the same time with the current code, so we can switch to setting i_flags to I_FREEING | I_CLEAR instead of I_CLEAR without loss of information. As the result of such change, checks become simpler and the amount of code that needs to know about I_CLEAR shrinks a lot. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-07-28fsnotify: rename fsnotify_mark_entry to just fsnotify_markEric Paris1-1/+1
The name is long and it serves no real purpose. So rename fsnotify_mark_entry to just fsnotify_mark. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28inotify: remove inotify in kernel interfaceEric Paris1-6/+0
nothing uses inotify in the kernel, drop it! Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-19mm: add context argument to shrinker callbackDave Chinner1-1/+1
The current shrinker implementation requires the registered callback to have global state to work from. This makes it difficult to shrink caches that are not global (e.g. per-filesystem caches). Pass the shrinker structure to the callback so that users can embed the shrinker structure in the context the shrinker needs to operate on and get back to it in the callback via container_of(). Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2010-05-21vfs: Add inode uid,gid,mode init helperDmitry Monakhov1-0/+20
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-05-21fs: inode.c use atomic_inc_return in __igetRichard Kennedy1-4/+2
Using atomic_inc_return in __iget(struct inode *inode) makes the intent of this code clearer and generates less code on processors that have this operation. On x86_64 this patch reduces the text size of inode.o by 12 bytes. Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> ---- patch against 2.6.34-rc7 compiled & tested on x86_64 AMD X2 I've been running with this patch applied for several weeks with no obvious problems. regards Richard Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-04-12security: remove dead hook inode_deleteEric Paris1-2/+0
Unused hook. Remove. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
2010-03-05dquot: move dquot initialization responsibility into the filesystemChristoph Hellwig1-3/+0
Currently various places in the VFS call vfs_dq_init directly. This means we tie the quota code into the VFS. Get rid of that and make the filesystem responsible for the initialization. For most metadata operations this is a straight forward move into the methods, but for truncate and open it's a bit more complicated. For truncate we currently only call vfs_dq_init for the sys_truncate case because open already takes care of it for ftruncate and open(O_TRUNC) - the new code causes an additional vfs_dq_init for those which is harmless. For open the initialization is moved from do_filp_open into the open method, which means it happens slightly earlier now, and only for regular files. The latter is fine because we don't need to initialize it for operations on special files, and we already do it as part of the namespace operations for directories. Add a dquot_file_open helper that filesystems that support generic quotas can use to fill in ->open. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
2010-03-05dquot: move dquot drop responsibility into the filesystemChristoph Hellwig1-1/+0
Currently clear_inode calls vfs_dq_drop directly. This means we tie the quota code into the VFS. Get rid of that and make the filesystem responsible for the drop inside the ->clear_inode superblock operation. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
2009-12-17kill I_LOCKChristoph Hellwig1-13/+13
After I_SYNC was split from I_LOCK the leftover is always used together with I_NEW and thus superflous. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-10-25LSM: imbed ima calls in the security hooksMimi Zohar1-10/+0
Based on discussions on LKML and LSM, where there are consecutive security_ and ima_ calls in the vfs layer, move the ima_ calls to the existing security_ hooks. Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
2009-09-24vfs: optimize touch_time() tooAndi Kleen1-20/+23
Do a similar optimization as earlier for touch_atime. Getting the lock in mnt_get_write is relatively costly, so try all avenues to avoid it first. This patch is careful to still only update inode fields inside the lock region. This didn't show up in benchmarks, but it's easy enough to do. [akpm@linux-foundation.org: fix typo in comment] [hugh.dickins@tiscali.co.uk: fix inverted test of mnt_want_write_file()] Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Valerie Aurora <vaurora@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-09-24vfs: optimization for touch_atime()Andi Kleen1-10/+10
Some benchmark testing shows touch_atime to be high up in profile logs for IO intensive workloads. Most likely that's due to the lock in mnt_want_write(). Unfortunately touch_atime first takes the lock, and then does all the other tests that could avoid atime updates (like noatime or relatime). Do it the other way round -- first try to avoid the update and only then if that didn't succeed take the lock. That works because none of the atime avoidance tests rely on locking. This also eliminates a goto. Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Christoph Hellwig <hch@infradead.org> Reviewed-by: Valerie Aurora <vaurora@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-09-24vfs: split generic_forget_inode() so that hugetlbfs does not have to copy itJan Kara1-2/+19
Hugetlbfs needs to do special things instead of truncate_inode_pages(). Currently, it copied generic_forget_inode() except for truncate_inode_pages() call which is asking for trouble (the code there isn't trivial). So create a separate function generic_detach_inode() which does all the list magic done in generic_forget_inode() and call it from hugetlbfs_forget_inode(). Signed-off-by: Jan Kara <jack@suse.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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