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-rw-r--r--fs/autofs4/expire.c55
-rw-r--r--fs/autofs4/root.c8
-rw-r--r--fs/autofs4/waitq.c6
3 files changed, 49 insertions, 20 deletions
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index b493909e7492..d8e6d421c27f 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -417,6 +417,7 @@ static struct dentry *should_expire(struct dentry *dentry,
}
return NULL;
}
+
/*
* Find an eligible tree to time-out
* A tree is eligible if :-
@@ -432,6 +433,7 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
struct dentry *root = sb->s_root;
struct dentry *dentry;
struct dentry *expired;
+ struct dentry *found;
struct autofs_info *ino;
if (!root)
@@ -442,31 +444,46 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
dentry = NULL;
while ((dentry = get_next_positive_subdir(dentry, root))) {
+ int flags = how;
+
spin_lock(&sbi->fs_lock);
ino = autofs4_dentry_ino(dentry);
- if (ino->flags & AUTOFS_INF_WANT_EXPIRE)
- expired = NULL;
- else
- expired = should_expire(dentry, mnt, timeout, how);
- if (!expired) {
+ if (ino->flags & AUTOFS_INF_WANT_EXPIRE) {
spin_unlock(&sbi->fs_lock);
continue;
}
+ spin_unlock(&sbi->fs_lock);
+
+ expired = should_expire(dentry, mnt, timeout, flags);
+ if (!expired)
+ continue;
+
+ spin_lock(&sbi->fs_lock);
ino = autofs4_dentry_ino(expired);
ino->flags |= AUTOFS_INF_WANT_EXPIRE;
spin_unlock(&sbi->fs_lock);
synchronize_rcu();
- spin_lock(&sbi->fs_lock);
- if (should_expire(expired, mnt, timeout, how)) {
- if (expired != dentry)
- dput(dentry);
- goto found;
- }
+ /* Make sure a reference is not taken on found if
+ * things have changed.
+ */
+ flags &= ~AUTOFS_EXP_LEAVES;
+ found = should_expire(expired, mnt, timeout, how);
+ if (!found || found != expired)
+ /* Something has changed, continue */
+ goto next;
+
+ if (expired != dentry)
+ dput(dentry);
+
+ spin_lock(&sbi->fs_lock);
+ goto found;
+next:
+ spin_lock(&sbi->fs_lock);
ino->flags &= ~AUTOFS_INF_WANT_EXPIRE;
+ spin_unlock(&sbi->fs_lock);
if (expired != dentry)
dput(expired);
- spin_unlock(&sbi->fs_lock);
}
return NULL;
@@ -483,6 +500,7 @@ int autofs4_expire_wait(struct dentry *dentry, int rcu_walk)
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
struct autofs_info *ino = autofs4_dentry_ino(dentry);
int status;
+ int state;
/* Block on any pending expire */
if (!(ino->flags & AUTOFS_INF_WANT_EXPIRE))
@@ -490,8 +508,19 @@ int autofs4_expire_wait(struct dentry *dentry, int rcu_walk)
if (rcu_walk)
return -ECHILD;
+retry:
spin_lock(&sbi->fs_lock);
- if (ino->flags & AUTOFS_INF_EXPIRING) {
+ state = ino->flags & (AUTOFS_INF_WANT_EXPIRE | AUTOFS_INF_EXPIRING);
+ if (state == AUTOFS_INF_WANT_EXPIRE) {
+ spin_unlock(&sbi->fs_lock);
+ /*
+ * Possibly being selected for expire, wait until
+ * it's selected or not.
+ */
+ schedule_timeout_uninterruptible(HZ/10);
+ goto retry;
+ }
+ if (state & AUTOFS_INF_EXPIRING) {
spin_unlock(&sbi->fs_lock);
pr_debug("waiting for expire %p name=%pd\n", dentry, dentry);
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 3767f6641af1..fa84bb8832e0 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -159,7 +159,7 @@ static struct dentry *autofs4_lookup_active(struct dentry *dentry)
{
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
struct dentry *parent = dentry->d_parent;
- struct qstr *name = &dentry->d_name;
+ const struct qstr *name = &dentry->d_name;
unsigned int len = name->len;
unsigned int hash = name->hash;
const unsigned char *str = name->name;
@@ -172,7 +172,7 @@ static struct dentry *autofs4_lookup_active(struct dentry *dentry)
list_for_each(p, head) {
struct autofs_info *ino;
struct dentry *active;
- struct qstr *qstr;
+ const struct qstr *qstr;
ino = list_entry(p, struct autofs_info, active);
active = ino->dentry;
@@ -214,7 +214,7 @@ static struct dentry *autofs4_lookup_expiring(struct dentry *dentry,
{
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
struct dentry *parent = dentry->d_parent;
- struct qstr *name = &dentry->d_name;
+ const struct qstr *name = &dentry->d_name;
unsigned int len = name->len;
unsigned int hash = name->hash;
const unsigned char *str = name->name;
@@ -227,7 +227,7 @@ static struct dentry *autofs4_lookup_expiring(struct dentry *dentry,
list_for_each(p, head) {
struct autofs_info *ino;
struct dentry *expiring;
- struct qstr *qstr;
+ const struct qstr *qstr;
if (rcu_walk) {
spin_unlock(&sbi->lookup_lock);
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 631f1554c87b..431fd7ee3488 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -225,7 +225,7 @@ rename_retry:
}
static struct autofs_wait_queue *
-autofs4_find_wait(struct autofs_sb_info *sbi, struct qstr *qstr)
+autofs4_find_wait(struct autofs_sb_info *sbi, const struct qstr *qstr)
{
struct autofs_wait_queue *wq;
@@ -249,7 +249,7 @@ autofs4_find_wait(struct autofs_sb_info *sbi, struct qstr *qstr)
*/
static int validate_request(struct autofs_wait_queue **wait,
struct autofs_sb_info *sbi,
- struct qstr *qstr,
+ const struct qstr *qstr,
struct dentry *dentry, enum autofs_notify notify)
{
struct autofs_wait_queue *wq;
@@ -398,7 +398,7 @@ int autofs4_wait(struct autofs_sb_info *sbi,
}
}
qstr.name = name;
- qstr.hash = full_name_hash(name, qstr.len);
+ qstr.hash = full_name_hash(dentry, name, qstr.len);
if (mutex_lock_interruptible(&sbi->wq_mutex)) {
kfree(qstr.name);
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