diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-03-03 21:23:02 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-03-03 21:23:03 (GMT) |
commit | 56a79b7b021bf1b08334e63c2c14b280e2dbf47a (patch) | |
tree | 0419233e6194f4f12073c9284852885aa8984bec /fs/9p/fid.c | |
parent | 1c82315a12144cde732636e259d39e3ee81b3c5b (diff) | |
parent | dcf787f39162ce32ca325b3e784aba2d2444619a (diff) | |
download | linux-fsl-qoriq-56a79b7b021bf1b08334e63c2c14b280e2dbf47a.tar.xz |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull more VFS bits from Al Viro:
"Unfortunately, it looks like xattr series will have to wait until the
next cycle ;-/
This pile contains 9p cleanups and fixes (races in v9fs_fid_add()
etc), fixup for nommu breakage in shmem.c, several cleanups and a bit
more file_inode() work"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
constify path_get/path_put and fs_struct.c stuff
fix nommu breakage in shmem.c
cache the value of file_inode() in struct file
9p: if v9fs_fid_lookup() gets to asking server, it'd better have hashed dentry
9p: make sure ->lookup() adds fid to the right dentry
9p: untangle ->lookup() a bit
9p: double iput() in ->lookup() if d_materialise_unique() fails
9p: v9fs_fid_add() can't fail now
v9fs: get rid of v9fs_dentry
9p: turn fid->dlist into hlist
9p: don't bother with private lock in ->d_fsdata; dentry->d_lock will do just fine
more file_inode() open-coded instances
selinux: opened file can't have NULL or negative ->f_path.dentry
(In the meantime, the hlist traversal macros have changed, so this
required a semantic conflict fixup for the newly hlistified fid->dlist)
Diffstat (limited to 'fs/9p/fid.c')
-rw-r--r-- | fs/9p/fid.c | 54 |
1 files changed, 25 insertions, 29 deletions
diff --git a/fs/9p/fid.c b/fs/9p/fid.c index afd4724..d51ec9f 100644 --- a/fs/9p/fid.c +++ b/fs/9p/fid.c @@ -41,29 +41,16 @@ * */ -int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) +static inline void __add_fid(struct dentry *dentry, struct p9_fid *fid) { - struct v9fs_dentry *dent; - - p9_debug(P9_DEBUG_VFS, "fid %d dentry %s\n", - fid->fid, dentry->d_name.name); - - dent = dentry->d_fsdata; - if (!dent) { - dent = kmalloc(sizeof(struct v9fs_dentry), GFP_KERNEL); - if (!dent) - return -ENOMEM; - - spin_lock_init(&dent->lock); - INIT_LIST_HEAD(&dent->fidlist); - dentry->d_fsdata = dent; - } - - spin_lock(&dent->lock); - list_add(&fid->dlist, &dent->fidlist); - spin_unlock(&dent->lock); + hlist_add_head(&fid->dlist, (struct hlist_head *)&dentry->d_fsdata); +} - return 0; +void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) +{ + spin_lock(&dentry->d_lock); + __add_fid(dentry, fid); + spin_unlock(&dentry->d_lock); } /** @@ -76,23 +63,23 @@ int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any) { - struct v9fs_dentry *dent; struct p9_fid *fid, *ret; p9_debug(P9_DEBUG_VFS, " dentry: %s (%p) uid %d any %d\n", dentry->d_name.name, dentry, from_kuid(&init_user_ns, uid), any); - dent = (struct v9fs_dentry *) dentry->d_fsdata; ret = NULL; - if (dent) { - spin_lock(&dent->lock); - list_for_each_entry(fid, &dent->fidlist, dlist) { + /* we'll recheck under lock if there's anything to look in */ + if (dentry->d_fsdata) { + struct hlist_head *h = (struct hlist_head *)&dentry->d_fsdata; + spin_lock(&dentry->d_lock); + hlist_for_each_entry(fid, h, dlist) { if (any || uid_eq(fid->uid, uid)) { ret = fid; break; } } - spin_unlock(&dent->lock); + spin_unlock(&dentry->d_lock); } return ret; @@ -215,8 +202,17 @@ static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry, } kfree(wnames); fid_out: - if (!IS_ERR(fid)) - v9fs_fid_add(dentry, fid); + if (!IS_ERR(fid)) { + spin_lock(&dentry->d_lock); + if (d_unhashed(dentry)) { + spin_unlock(&dentry->d_lock); + p9_client_clunk(fid); + fid = ERR_PTR(-ENOENT); + } else { + __add_fid(dentry, fid); + spin_unlock(&dentry->d_lock); + } + } err_out: up_read(&v9ses->rename_sem); return fid; |