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-rw-r--r--fs/autofs4/autofs_i.h2
-rw-r--r--fs/autofs4/dev-ioctl.c4
-rw-r--r--fs/autofs4/expire.c84
-rw-r--r--fs/autofs4/root.c64
-rw-r--r--fs/autofs4/waitq.c6
5 files changed, 92 insertions, 68 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index 54f92379272..475f9c597cb 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -61,8 +61,6 @@ do { \
current->pid, __func__, ##args); \
} while (0)
-extern spinlock_t autofs4_lock;
-
/* Unified info structure. This is pointed to by both the dentry and
inode structures. Each file in the filesystem has an instance of this
structure. It holds a reference to the dentry, so dentries are never
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 1442da4860e..509fe1eb66a 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -372,6 +372,10 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
return -EBUSY;
} else {
struct file *pipe = fget(pipefd);
+ if (!pipe) {
+ err = -EBADF;
+ goto out;
+ }
if (!pipe->f_op || !pipe->f_op->write) {
err = -EPIPE;
fput(pipe);
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index f43100b9662..450f529a4ea 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -87,18 +87,70 @@ done:
}
/*
+ * Calculate and dget next entry in the subdirs list under root.
+ */
+static struct dentry *get_next_positive_subdir(struct dentry *prev,
+ struct dentry *root)
+{
+ struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
+ struct list_head *next;
+ struct dentry *p, *q;
+
+ spin_lock(&sbi->lookup_lock);
+
+ if (prev == NULL) {
+ spin_lock(&root->d_lock);
+ prev = dget_dlock(root);
+ next = prev->d_subdirs.next;
+ p = prev;
+ goto start;
+ }
+
+ p = prev;
+ spin_lock(&p->d_lock);
+again:
+ next = p->d_u.d_child.next;
+start:
+ if (next == &root->d_subdirs) {
+ spin_unlock(&p->d_lock);
+ spin_unlock(&sbi->lookup_lock);
+ dput(prev);
+ return NULL;
+ }
+
+ q = list_entry(next, struct dentry, d_u.d_child);
+
+ spin_lock_nested(&q->d_lock, DENTRY_D_LOCK_NESTED);
+ /* Negative dentry - try next */
+ if (!simple_positive(q)) {
+ spin_unlock(&p->d_lock);
+ p = q;
+ goto again;
+ }
+ dget_dlock(q);
+ spin_unlock(&q->d_lock);
+ spin_unlock(&p->d_lock);
+ spin_unlock(&sbi->lookup_lock);
+
+ dput(prev);
+
+ return q;
+}
+
+/*
* Calculate and dget next entry in top down tree traversal.
*/
static struct dentry *get_next_positive_dentry(struct dentry *prev,
struct dentry *root)
{
+ struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
struct list_head *next;
struct dentry *p, *ret;
if (prev == NULL)
return dget(root);
- spin_lock(&autofs4_lock);
+ spin_lock(&sbi->lookup_lock);
relock:
p = prev;
spin_lock(&p->d_lock);
@@ -110,7 +162,7 @@ again:
if (p == root) {
spin_unlock(&p->d_lock);
- spin_unlock(&autofs4_lock);
+ spin_unlock(&sbi->lookup_lock);
dput(prev);
return NULL;
}
@@ -140,7 +192,7 @@ again:
dget_dlock(ret);
spin_unlock(&ret->d_lock);
spin_unlock(&p->d_lock);
- spin_unlock(&autofs4_lock);
+ spin_unlock(&sbi->lookup_lock);
dput(prev);
@@ -290,11 +342,8 @@ struct dentry *autofs4_expire_direct(struct super_block *sb,
spin_lock(&sbi->fs_lock);
ino = autofs4_dentry_ino(root);
/* No point expiring a pending mount */
- if (ino->flags & AUTOFS_INF_PENDING) {
- spin_unlock(&sbi->fs_lock);
- return NULL;
- }
- managed_dentry_set_transit(root);
+ if (ino->flags & AUTOFS_INF_PENDING)
+ goto out;
if (!autofs4_direct_busy(mnt, root, timeout, do_now)) {
struct autofs_info *ino = autofs4_dentry_ino(root);
ino->flags |= AUTOFS_INF_EXPIRING;
@@ -302,7 +351,7 @@ struct dentry *autofs4_expire_direct(struct super_block *sb,
spin_unlock(&sbi->fs_lock);
return root;
}
- managed_dentry_clear_transit(root);
+out:
spin_unlock(&sbi->fs_lock);
dput(root);
@@ -336,13 +385,12 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
timeout = sbi->exp_timeout;
dentry = NULL;
- while ((dentry = get_next_positive_dentry(dentry, root))) {
+ while ((dentry = get_next_positive_subdir(dentry, root))) {
spin_lock(&sbi->fs_lock);
ino = autofs4_dentry_ino(dentry);
/* No point expiring a pending mount */
if (ino->flags & AUTOFS_INF_PENDING)
- goto cont;
- managed_dentry_set_transit(dentry);
+ goto next;
/*
* Case 1: (i) indirect mount or top level pseudo direct mount
@@ -402,8 +450,6 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
}
}
next:
- managed_dentry_clear_transit(dentry);
-cont:
spin_unlock(&sbi->fs_lock);
}
return NULL;
@@ -415,13 +461,13 @@ found:
ino->flags |= AUTOFS_INF_EXPIRING;
init_completion(&ino->expire_complete);
spin_unlock(&sbi->fs_lock);
- spin_lock(&autofs4_lock);
+ spin_lock(&sbi->lookup_lock);
spin_lock(&expired->d_parent->d_lock);
spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED);
list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child);
spin_unlock(&expired->d_lock);
spin_unlock(&expired->d_parent->d_lock);
- spin_unlock(&autofs4_lock);
+ spin_unlock(&sbi->lookup_lock);
return expired;
}
@@ -484,8 +530,6 @@ int autofs4_expire_run(struct super_block *sb,
spin_lock(&sbi->fs_lock);
ino = autofs4_dentry_ino(dentry);
ino->flags &= ~AUTOFS_INF_EXPIRING;
- if (!d_unhashed(dentry))
- managed_dentry_clear_transit(dentry);
complete_all(&ino->expire_complete);
spin_unlock(&sbi->fs_lock);
@@ -513,9 +557,7 @@ int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
spin_lock(&sbi->fs_lock);
ino->flags &= ~AUTOFS_INF_EXPIRING;
spin_lock(&dentry->d_lock);
- if (ret)
- __managed_dentry_clear_transit(dentry);
- else {
+ if (!ret) {
if ((IS_ROOT(dentry) ||
(autofs_type_indirect(sbi->type) &&
IS_ROOT(dentry->d_parent))) &&
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index e6f84d26f4c..f55ae23b137 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -23,8 +23,6 @@
#include "autofs_i.h"
-DEFINE_SPINLOCK(autofs4_lock);
-
static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *);
static int autofs4_dir_unlink(struct inode *,struct dentry *);
static int autofs4_dir_rmdir(struct inode *,struct dentry *);
@@ -125,15 +123,15 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
* autofs file system so just let the libfs routines handle
* it.
*/
- spin_lock(&autofs4_lock);
+ spin_lock(&sbi->lookup_lock);
spin_lock(&dentry->d_lock);
if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
spin_unlock(&dentry->d_lock);
- spin_unlock(&autofs4_lock);
+ spin_unlock(&sbi->lookup_lock);
return -ENOENT;
}
spin_unlock(&dentry->d_lock);
- spin_unlock(&autofs4_lock);
+ spin_unlock(&sbi->lookup_lock);
out:
return dcache_dir_open(inode, file);
@@ -171,7 +169,6 @@ static struct dentry *autofs4_lookup_active(struct dentry *dentry)
const unsigned char *str = name->name;
struct list_head *p, *head;
- spin_lock(&autofs4_lock);
spin_lock(&sbi->lookup_lock);
head = &sbi->active_list;
list_for_each(p, head) {
@@ -204,14 +201,12 @@ static struct dentry *autofs4_lookup_active(struct dentry *dentry)
dget_dlock(active);
spin_unlock(&active->d_lock);
spin_unlock(&sbi->lookup_lock);
- spin_unlock(&autofs4_lock);
return active;
}
next:
spin_unlock(&active->d_lock);
}
spin_unlock(&sbi->lookup_lock);
- spin_unlock(&autofs4_lock);
return NULL;
}
@@ -226,7 +221,6 @@ static struct dentry *autofs4_lookup_expiring(struct dentry *dentry)
const unsigned char *str = name->name;
struct list_head *p, *head;
- spin_lock(&autofs4_lock);
spin_lock(&sbi->lookup_lock);
head = &sbi->expiring_list;
list_for_each(p, head) {
@@ -259,14 +253,12 @@ static struct dentry *autofs4_lookup_expiring(struct dentry *dentry)
dget_dlock(expiring);
spin_unlock(&expiring->d_lock);
spin_unlock(&sbi->lookup_lock);
- spin_unlock(&autofs4_lock);
return expiring;
}
next:
spin_unlock(&expiring->d_lock);
}
spin_unlock(&sbi->lookup_lock);
- spin_unlock(&autofs4_lock);
return NULL;
}
@@ -275,17 +267,16 @@ static int autofs4_mount_wait(struct dentry *dentry)
{
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
struct autofs_info *ino = autofs4_dentry_ino(dentry);
- int status;
+ int status = 0;
if (ino->flags & AUTOFS_INF_PENDING) {
DPRINTK("waiting for mount name=%.*s",
dentry->d_name.len, dentry->d_name.name);
status = autofs4_wait(sbi, dentry, NFY_MOUNT);
DPRINTK("mount wait done status=%d", status);
- ino->last_used = jiffies;
- return status;
}
- return 0;
+ ino->last_used = jiffies;
+ return status;
}
static int do_expire_wait(struct dentry *dentry)
@@ -319,9 +310,12 @@ static struct dentry *autofs4_mountpoint_changed(struct path *path)
*/
if (autofs_type_indirect(sbi->type) && d_unhashed(dentry)) {
struct dentry *parent = dentry->d_parent;
+ struct autofs_info *ino;
struct dentry *new = d_lookup(parent, &dentry->d_name);
if (!new)
return NULL;
+ ino = autofs4_dentry_ino(new);
+ ino->last_used = jiffies;
dput(path->dentry);
path->dentry = new;
}
@@ -338,18 +332,6 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
DPRINTK("dentry=%p %.*s",
dentry, dentry->d_name.len, dentry->d_name.name);
- /*
- * Someone may have manually umounted this or it was a submount
- * that has gone away.
- */
- spin_lock(&dentry->d_lock);
- if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
- if (!(dentry->d_flags & DCACHE_MANAGE_TRANSIT) &&
- (dentry->d_flags & DCACHE_NEED_AUTOMOUNT))
- __managed_dentry_set_transit(path->dentry);
- }
- spin_unlock(&dentry->d_lock);
-
/* The daemon never triggers a mount. */
if (autofs4_oz_mode(sbi))
return NULL;
@@ -418,18 +400,17 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
done:
if (!(ino->flags & AUTOFS_INF_EXPIRING)) {
/*
- * Any needed mounting has been completed and the path updated
- * so turn this into a normal dentry so we don't continually
- * call ->d_automount() and ->d_manage().
- */
- spin_lock(&dentry->d_lock);
- __managed_dentry_clear_transit(dentry);
- /*
+ * Any needed mounting has been completed and the path
+ * updated so clear DCACHE_NEED_AUTOMOUNT so we don't
+ * call ->d_automount() on rootless multi-mounts since
+ * it can lead to an incorrect ELOOP error return.
+ *
* Only clear DMANAGED_AUTOMOUNT for rootless multi-mounts and
* symlinks as in all other cases the dentry will be covered by
* an actual mount so ->d_automount() won't be called during
* the follow.
*/
+ spin_lock(&dentry->d_lock);
if ((!d_mountpoint(dentry) &&
!list_empty(&dentry->d_subdirs)) ||
(dentry->d_inode && S_ISLNK(dentry->d_inode->i_mode)))
@@ -455,6 +436,8 @@ int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
/* The daemon never waits. */
if (autofs4_oz_mode(sbi)) {
+ if (rcu_walk)
+ return 0;
if (!d_mountpoint(dentry))
return -EISDIR;
return 0;
@@ -612,12 +595,12 @@ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
dir->i_mtime = CURRENT_TIME;
- spin_lock(&autofs4_lock);
- autofs4_add_expiring(dentry);
+ spin_lock(&sbi->lookup_lock);
+ __autofs4_add_expiring(dentry);
spin_lock(&dentry->d_lock);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
- spin_unlock(&autofs4_lock);
+ spin_unlock(&sbi->lookup_lock);
return 0;
}
@@ -629,7 +612,7 @@ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
* set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
* of the directory tree. There is no need to clear the automount flag
* following a mount or restore it after an expire because these mounts
- * are always covered. However, it is neccessary to ensure that these
+ * are always covered. However, it is necessary to ensure that these
* flags are clear on non-empty directories to avoid unnecessary calls
* during path walks.
*/
@@ -686,20 +669,17 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
if (!autofs4_oz_mode(sbi))
return -EACCES;
- spin_lock(&autofs4_lock);
spin_lock(&sbi->lookup_lock);
spin_lock(&dentry->d_lock);
if (!list_empty(&dentry->d_subdirs)) {
spin_unlock(&dentry->d_lock);
spin_unlock(&sbi->lookup_lock);
- spin_unlock(&autofs4_lock);
return -ENOTEMPTY;
}
__autofs4_add_expiring(dentry);
- spin_unlock(&sbi->lookup_lock);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
- spin_unlock(&autofs4_lock);
+ spin_unlock(&sbi->lookup_lock);
if (sbi->version < 5)
autofs_clear_leaf_automount_flags(dentry);
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 56010056b2e..25435987d6a 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -197,12 +197,12 @@ rename_retry:
seq = read_seqbegin(&rename_lock);
rcu_read_lock();
- spin_lock(&autofs4_lock);
+ spin_lock(&sbi->fs_lock);
for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent)
len += tmp->d_name.len + 1;
if (!len || --len > NAME_MAX) {
- spin_unlock(&autofs4_lock);
+ spin_unlock(&sbi->fs_lock);
rcu_read_unlock();
if (read_seqretry(&rename_lock, seq))
goto rename_retry;
@@ -218,7 +218,7 @@ rename_retry:
p -= tmp->d_name.len;
strncpy(p, tmp->d_name.name, tmp->d_name.len);
}
- spin_unlock(&autofs4_lock);
+ spin_unlock(&sbi->fs_lock);
rcu_read_unlock();
if (read_seqretry(&rename_lock, seq))
goto rename_retry;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-01 03:16:18 +0000