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path: root/fs/9p/vfs_inode.c
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2011-05-26vfs: push dentry_unhash on rename_dir into file systemsSage Weil
Only a few file systems need this. Start by pushing it down into each rename method (except gfs2 and xfs) so that it can be dealt with on a per-fs basis. Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-05-26vfs: push dentry_unhash on rmdir into file systemsSage Weil
Only a few file systems need this. Start by pushing it down into each fs rmdir method (except gfs2 and xfs) so it can be dealt with on a per-fs basis. This does not change behavior for any in-tree file systems. Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-22fs/9p: Add v9fs_dentry2v9sesAneesh Kumar K.V
Add the new static inline and use the same Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22fs/9p: Attach writeback_fid on first open with WR flagAneesh Kumar K.V
We don't need writeback fid if we are only doing O_RDONLY open Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22fs/9p: Use truncate_setsize instead of vmtruncateAneesh Kumar K.V
convert vmtruncate usage to truncate_setsize. We also writeback all dirty pages before doing 9p operations and on success call truncate_setsize. This ensure that we continue sanely on failed truncate on the server. The disadvantage is that we are now going to write back the content that get thrown away later as a part of truncate. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-22fs/9p: Fix race in initializing writeback fidAneesh Kumar K.V
When two process open the same file we can end up with both of them allocating the writeback_fid. Add a new mutex which can be used for synchronizing v9fs_inode member values. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Writeback dirty data before setattrAneesh Kumar K.V
change file attribute can result in making the file readonly. So flush the dirty pages before that. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: call vmtruncate before setattr 9p opeationAneesh Kumar K.V
We need to call vmtruncate before 9p setattr operation, otherwise we could write back some dirty pages between setattr with ATTR_SIZE and vmtruncate causing some truncated pages to be written back to server Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Properly update inode attributes on linkAneesh Kumar K.V
With caching enabled, we need to make sure we don't update inode->i_size via stat2inode because we could have dirty data which is not yet written to the server Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Workaround vfs rename rehash bugAneesh Kumar K.V
This is similar to what ceph, ocfs2 and nfs does http://kerneltrap.org/mailarchive/linux-fsdevel/2008/4/18/1498534 May be we should get vfs fixed Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Mark directory inode invalid for many directory inode operationsAneesh Kumar K.V
One successfull directory operation we would have changed directory inode attribute. So mark them invalid Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: mark inode attribute invalid on rename, unlink and setattrAneesh Kumar K.V
rename, unlink and setattr can result in update of inode attribute. So mark the cached copy invalid Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Add support for marking inode attribute invalidAneesh Kumar K.V
With cached mode some of the file system operation result in updating inode attributes (ctime). Add support for marking inode attribute invalid in such cases so that we fetch the updated inode attribute on dentry revalidation. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Update link count correctly on different file system operationsAneesh Kumar K.V
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Move writeback fid to v9fs_inodeAneesh Kumar K.V
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Add v9fs_inodeAneesh Kumar K.V
Switch to the fscache code to v9fs_inode. We will later use v9fs_inode in cache=loose mode to track the inode cache validity timeout. Ie if we find an inode in cache older that a specific jiffie range we will consider it stale Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Don't set stat.st_blocks based on nrpagesAneesh Kumar K.V
simple_getattr does set stat.st_blocks to a value derived from nrpages. That is not correct with 9p Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Add inode hashingAneesh Kumar K.V
We didn't add the inode to inode hash in 9p. We need to do that to get sync to work, otherwise __mark_inode_dirty will not add the inode to super block's dirty list. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: Add fid to inode in cached modeAneesh Kumar K.V
The fid attached to inode will be opened O_RDWR mode and is used for dirty page writeback only. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: set fs cache cookie in create path alsoAneesh Kumar K.V
We need to call v9fs_cache_inode_set_cookie in create path also Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15fs/9p: set the cached file_operations struct during inode initAneesh Kumar K.V
With the old code we were not setting the file->f_op with cached file operations during creat. (format correction by jvrao@linux.vnet.ibm.com) Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-01-12switch 9pAl Viro
here we actually *want* ->d_op for root; setting it allows to get rid of kludge in v9fs_kill_super() since now we have proper ->d_release() for root and don't need to call it manually. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-01-11fs/9p: Don't set dentry->d_op in create routinesAneesh Kumar K.V
We do set dentry->d_op in lookup even in case of EOENT entries. That implies we should have dentry->d_op already set when create/mkdir/mknod/link/symlink routines are called Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-01-11fs/9p: Move dotl inode operations into a seperate fileAneesh Kumar K.V
Source Code Reorganization Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-01-07fs: dcache per-inode inode alias lockingNick Piggin
dcache_inode_lock can be replaced with per-inode locking. Use existing inode->i_lock for this. This is slightly non-trivial because we sometimes need to find the inode from the dentry, which requires d_inode to be stabilised (either with refcount or d_lock). Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache reduce branches in lookup pathNick Piggin
Reduce some branches and memory accesses in dcache lookup by adding dentry flags to indicate common d_ops are set, rather than having to check them. This saves a pointer memory access (dentry->d_op) in common path lookup situations, and saves another pointer load and branch in cases where we have d_op but not the particular operation. Patched with: git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: icache RCU free inodesNick Piggin
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: dcache remove dcache_lockNick Piggin
dcache_lock no longer protects anything. remove it. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: scale inode alias listNick Piggin
Add a new lock, dcache_inode_lock, to protect the inode's i_dentry list from concurrent modification. d_alias is also protected by d_lock. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2010-10-28fs/9p: Use generic_file_open with lookup_instantiate_filpAneesh Kumar K.V
We need to do O_LARGEFILE check even in case of 9p. Use the generic_file_open helper Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-28fs/9p: Add missing iput in v9fs_vfs_lookupAneesh Kumar K.V
Make sure we drop inode reference in the error path Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-28fs/9p: Use mknod 9p operation on create without open requestAneesh Kumar K.V
A create without LOOKUP_OPEN flag set is due to mknod of regular files. Use mknod 9P operation for the same Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-289p: Implement TREADLINK operation for 9p2000.LM. Mohan Kumar
Synopsis size[4] TReadlink tag[2] fid[4] size[4] RReadlink tag[2] target[s] Description Readlink is used to return the contents of the symoblic link referred by fid. Contents of symboic link is returned as a response. target[s] - Contents of the symbolic link referred by fid. Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-28fs/9p: Implement create time inheritanceAneesh Kumar K.V
Inherit default ACL on create Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-28fs/9p: Update ACL on chmodAneesh Kumar K.V
We need update the acl value on chmod Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-28fs/9p: Implement setting posix aclAneesh Kumar K.V
This patch also update mode bits, as a normal file system. I am not sure wether we should do that, considering that a setxattr on the server will again update the ACL/mode value Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-28fs/9p: Implement POSIX ACL permission checking functionAneesh Kumar K.V
The ACL value is fetched as a part of inode initialization from the server and the permission checking function use the cached value of the ACL Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-28fs/9p: mkdir fix for setting S_ISGID bit as per parent directoryHarsh Prateek Bora
The current implementation of 9p client mkdir function does not set the S_ISGID mode bit for the directory being created if the parent directory has this bit set. This patch fixes this problem so that the newly created directory inherits the gid from parent directory and not from the process creating this directory, when the S_ISGID bit is set in parent directory. Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-289p: remove unneeded checksDan Carpenter
git_t is unsigned an can never be less than zero. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-10-25new helper: ihold()Al Viro
Clones an existing reference to inode; caller must already hold one. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-09-13fs/9p: Don't use dotl version of mknod for dotu inode operationsAneesh Kumar K.V
We should not use dotlversion for the dotu inode operations Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-09-13fs/9p: Use the correct dentry operationsAneesh Kumar K.V
We should use the cached dentry operation only if caching mode is enabled Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-09-13fs/9p, net/9p: memory leak fixesLatchesar Ionkov
Four memory leak fixes in the 9P code. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-08-11v9fs: fixup for inode_setattr being removedStephen Rothwell
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-10Merge branch 'for-linus' of ↵Linus Torvalds
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: (96 commits) no need for list_for_each_entry_safe()/resetting with superblock list Fix sget() race with failing mount vfs: don't hold s_umount over close_bdev_exclusive() call sysv: do not mark superblock dirty on remount sysv: do not mark superblock dirty on mount btrfs: remove junk sb_dirt change BFS: clean up the superblock usage AFFS: wait for sb synchronization when needed AFFS: clean up dirty flag usage cifs: truncate fallout mbcache: fix shrinker function return value mbcache: Remove unused features add f_flags to struct statfs(64) pass a struct path to vfs_statfs update VFS documentation for method changes. All filesystems that need invalidate_inode_buffers() are doing that explicitly convert remaining ->clear_inode() to ->evict_inode() Make ->drop_inode() just return whether inode needs to be dropped fs/inode.c:clear_inode() is gone fs/inode.c:evict() doesn't care about delete vs. non-delete paths now ... Fix up trivial conflicts in fs/nilfs2/super.c
2010-08-09convert remaining ->clear_inode() to ->evict_inode()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-09remove inode_setattrChristoph Hellwig
Replace inode_setattr with opencoded variants of it in all callers. This moves the remaining call to vmtruncate into the filesystem methods where it can be replaced with the proper truncate sequence. In a few cases it was obvious that we would never end up calling vmtruncate so it was left out in the opencoded variant: spufs: explicitly checks for ATTR_SIZE earlier btrfs,hugetlbfs,logfs,dlmfs: explicitly clears ATTR_SIZE earlier ufs: contains an opencoded simple_seattr + truncate that sets the filesize just above In addition to that ncpfs called inode_setattr with handcrafted iattrs, which allowed to trim down the opencoded variant. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-08-02fs/9p: remove sparse warning in vfs_inodeEric Van Hensbergen
make v9fs_dentry_from_dir_inode static Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-08-02fs/9p: Prevent parallel rename when doing fid_lookupAneesh Kumar K.V
During fid lookup we need to make sure that the dentry->d_parent doesn't change so that we can safely walk the parent dentries. To ensure that we need to prevent cross directory rename during fid_lookup. Add a per superblock rename_sem rw_semaphore to prevent parallel fid lookup and rename. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-08-02fs/9p: Add support user. xattrAneesh Kumar K.V
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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