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authorEric W. Biederman <ebiederm@xmission.com>2014-02-13 09:39:37 -0800
committerAl Viro <viro@zeniv.linux.org.uk>2014-10-09 02:38:57 -0400
commit1ffe46d11cc88479797b262f60d92e5fb461b411 (patch)
treea2a710d4440ab248d0f57a064207068aad6342bc /fs
parent9b053f3207e8887fed88162a339fdd4001abcdb2 (diff)
downloadlinux-1ffe46d11cc88479797b262f60d92e5fb461b411.tar.bz2
vfs: Merge check_submounts_and_drop and d_invalidate
Now that d_invalidate is the only caller of check_submounts_and_drop, expand check_submounts_and_drop inline in d_invalidate. Reviewed-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/dcache.c55
1 files changed, 22 insertions, 33 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 484114a4db93..5e02b9eee6b1 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -645,32 +645,6 @@ kill_it:
}
EXPORT_SYMBOL(dput);
-/**
- * d_invalidate - invalidate a dentry
- * @dentry: dentry to invalidate
- *
- * Try to invalidate the dentry if it turns out to be
- * possible. If there are reasons not to delete it
- * return -EBUSY. On success return 0.
- *
- * no dcache lock.
- */
-
-int d_invalidate(struct dentry * dentry)
-{
- /*
- * If it's already been dropped, return OK.
- */
- spin_lock(&dentry->d_lock);
- if (d_unhashed(dentry)) {
- spin_unlock(&dentry->d_lock);
- return 0;
- }
- spin_unlock(&dentry->d_lock);
-
- return check_submounts_and_drop(dentry);
-}
-EXPORT_SYMBOL(d_invalidate);
/* This must be called with d_lock held */
static inline void __dget_dlock(struct dentry *dentry)
@@ -1190,7 +1164,7 @@ EXPORT_SYMBOL(have_submounts);
* reachable (e.g. NFS can unhash a directory dentry and then the complete
* subtree can become unreachable).
*
- * Only one of check_submounts_and_drop() and d_set_mounted() must succeed. For
+ * Only one of d_invalidate() and d_set_mounted() must succeed. For
* this reason take rename_lock and d_lock on dentry and ancestors.
*/
int d_set_mounted(struct dentry *dentry)
@@ -1199,7 +1173,7 @@ int d_set_mounted(struct dentry *dentry)
int ret = -ENOENT;
write_seqlock(&rename_lock);
for (p = dentry->d_parent; !IS_ROOT(p); p = p->d_parent) {
- /* Need exclusion wrt. check_submounts_and_drop() */
+ /* Need exclusion wrt. d_invalidate() */
spin_lock(&p->d_lock);
if (unlikely(d_unhashed(p))) {
spin_unlock(&p->d_lock);
@@ -1369,18 +1343,33 @@ static void check_and_drop(void *_data)
}
/**
- * check_submounts_and_drop - detach submounts, prune dcache, and drop
+ * d_invalidate - detach submounts, prune dcache, and drop
+ * @dentry: dentry to invalidate (aka detach, prune and drop)
+ *
+ * Try to invalidate the dentry if it turns out to be
+ * possible. If there are reasons not to delete it
+ * return -EBUSY. On success return 0.
+ *
+ * no dcache lock.
*
* The final d_drop is done as an atomic operation relative to
* rename_lock ensuring there are no races with d_set_mounted. This
* ensures there are no unhashed dentries on the path to a mountpoint.
- *
- * @dentry: dentry to detach, prune and drop
*/
-int check_submounts_and_drop(struct dentry *dentry)
+int d_invalidate(struct dentry *dentry)
{
int ret = 0;
+ /*
+ * If it's already been dropped, return OK.
+ */
+ spin_lock(&dentry->d_lock);
+ if (d_unhashed(dentry)) {
+ spin_unlock(&dentry->d_lock);
+ return 0;
+ }
+ spin_unlock(&dentry->d_lock);
+
/* Negative dentries can be dropped without further checks */
if (!dentry->d_inode) {
d_drop(dentry);
@@ -1414,7 +1403,7 @@ int check_submounts_and_drop(struct dentry *dentry)
out:
return ret;
}
-EXPORT_SYMBOL(check_submounts_and_drop);
+EXPORT_SYMBOL(d_invalidate);
/**
* __d_alloc - allocate a dcache entry