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author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-07 19:56:33 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-07 19:56:33 +0300 |
commit | b4a45f5fe8078bfc10837dbd5b98735058bc4698 (patch) | |
tree | df6f13a27610a3ec7eb4a661448cd779a8f84c79 /drivers/staging/pohmelfs/path_entry.c | |
parent | 01539ba2a706ab7d35fc0667dff919ade7f87d63 (diff) | |
parent | b3e19d924b6eaf2ca7d22cba99a517c5171007b6 (diff) | |
download | linux-b4a45f5fe8078bfc10837dbd5b98735058bc4698.tar.xz |
Merge branch 'vfs-scale-working' of git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin
* 'vfs-scale-working' of git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin: (57 commits)
fs: scale mntget/mntput
fs: rename vfsmount counter helpers
fs: implement faster dentry memcmp
fs: prefetch inode data in dcache lookup
fs: improve scalability of pseudo filesystems
fs: dcache per-inode inode alias locking
fs: dcache per-bucket dcache hash locking
bit_spinlock: add required includes
kernel: add bl_list
xfs: provide simple rcu-walk ACL implementation
btrfs: provide simple rcu-walk ACL implementation
ext2,3,4: provide simple rcu-walk ACL implementation
fs: provide simple rcu-walk generic_check_acl implementation
fs: provide rcu-walk aware permission i_ops
fs: rcu-walk aware d_revalidate method
fs: cache optimise dentry and inode for rcu-walk
fs: dcache reduce branches in lookup path
fs: dcache remove d_mounted
fs: fs_struct use seqlock
fs: rcu-walk for path lookup
...
Diffstat (limited to 'drivers/staging/pohmelfs/path_entry.c')
-rw-r--r-- | drivers/staging/pohmelfs/path_entry.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/staging/pohmelfs/path_entry.c b/drivers/staging/pohmelfs/path_entry.c index 8ec83d2dffb7..400a9fc386ad 100644 --- a/drivers/staging/pohmelfs/path_entry.c +++ b/drivers/staging/pohmelfs/path_entry.c @@ -83,10 +83,11 @@ out: int pohmelfs_path_length(struct pohmelfs_inode *pi) { struct dentry *d, *root, *first; - int len = 1; /* Root slash */ + int len; + unsigned seq; - first = d = d_find_alias(&pi->vfs_inode); - if (!d) { + first = d_find_alias(&pi->vfs_inode); + if (!first) { dprintk("%s: ino: %llu, mode: %o.\n", __func__, pi->ino, pi->vfs_inode.i_mode); return -ENOENT; } @@ -95,7 +96,11 @@ int pohmelfs_path_length(struct pohmelfs_inode *pi) root = dget(current->fs->root.dentry); spin_unlock(¤t->fs->lock); - spin_lock(&dcache_lock); +rename_retry: + len = 1; /* Root slash */ + d = first; + seq = read_seqbegin(&rename_lock); + rcu_read_lock(); if (!IS_ROOT(d) && d_unhashed(d)) len += UNHASHED_OBSCURE_STRING_SIZE; /* Obscure " (deleted)" string */ @@ -104,7 +109,9 @@ int pohmelfs_path_length(struct pohmelfs_inode *pi) len += d->d_name.len + 1; /* Plus slash */ d = d->d_parent; } - spin_unlock(&dcache_lock); + rcu_read_unlock(); + if (read_seqretry(&rename_lock, seq)) + goto rename_retry; dput(root); dput(first); |