struct autofs_info *ino = autofs4_dentry_ino(dentry);
int status;
- /* Block on any pending expiry here; invalidate the dentry
- when expiration is done to trigger mount request with a new
- dentry */
- if (ino && (ino->flags & AUTOFS_INF_EXPIRING)) {
- DPRINTK("waiting for expire %p name=%.*s",
- dentry, dentry->d_name.len, dentry->d_name.name);
-
- status = autofs4_wait(sbi, dentry, NFY_NONE);
-
- DPRINTK("expire done status=%d", status);
-
- /*
- * If the directory still exists the mount request must
- * continue otherwise it can't be followed at the right
- * time during the walk.
- */
- status = d_invalidate(dentry);
- if (status != -EBUSY)
- return -EAGAIN;
- }
-
DPRINTK("dentry=%p %.*s ino=%p",
dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
return status;
}
/* Trigger mount for path component or follow link */
- } else if (flags & (TRIGGER_FLAGS | TRIGGER_INTENTS) ||
+ } else if (dentry->d_flags & DCACHE_AUTOFS_PENDING ||
+ flags & (TRIGGER_FLAGS | TRIGGER_INTENTS) ||
current->link_count) {
DPRINTK("waiting for mount name=%.*s",
dentry->d_name.len, dentry->d_name.name);
DPRINTK("dentry=%p %.*s oz_mode=%d nd->flags=%d",
dentry, dentry->d_name.len, dentry->d_name.name, oz_mode,
nd->flags);
-
- /* If it's our master or we shouldn't trigger a mount we're done */
- lookup_type = nd->flags & (TRIGGER_FLAGS | TRIGGER_INTENTS);
- if (oz_mode || !lookup_type)
+ /*
+ * For an expire of a covered direct or offset mount we need
+ * to beeak out of follow_down() at the autofs mount trigger
+ * (d_mounted--), so we can see the expiring flag, and manage
+ * the blocking and following here until the expire is completed.
+ */
+ if (oz_mode) {
+ spin_lock(&sbi->fs_lock);
+ if (ino->flags & AUTOFS_INF_EXPIRING) {
+ spin_unlock(&sbi->fs_lock);
+ /* Follow down to our covering mount. */
+ if (!follow_down(&nd->path.mnt, &nd->path.dentry))
+ goto done;
+ goto follow;
+ }
+ spin_unlock(&sbi->fs_lock);
goto done;
+ }
- /* If an expire request is pending wait for it. */
- if (ino && (ino->flags & AUTOFS_INF_EXPIRING)) {
- DPRINTK("waiting for active request %p name=%.*s",
- dentry, dentry->d_name.len, dentry->d_name.name);
-
- status = autofs4_wait(sbi, dentry, NFY_NONE);
+ /* If an expire request is pending everyone must wait. */
+ autofs4_expire_wait(dentry);
- DPRINTK("request done status=%d", status);
- }
+ /* We trigger a mount for almost all flags */
+ lookup_type = nd->flags & (TRIGGER_FLAGS | TRIGGER_INTENTS);
+ if (!(lookup_type || dentry->d_flags & DCACHE_AUTOFS_PENDING))
+ goto follow;
/*
- * If the dentry contains directories then it is an
- * autofs multi-mount with no root mount offset. So
- * don't try to mount it again.
+ * If the dentry contains directories then it is an autofs
+ * multi-mount with no root mount offset. So don't try to
+ * mount it again.
*/
spin_lock(&dcache_lock);
- if (!d_mountpoint(dentry) && __simple_empty(dentry)) {
+ if (dentry->d_flags & DCACHE_AUTOFS_PENDING ||
+ (!d_mountpoint(dentry) && __simple_empty(dentry))) {
spin_unlock(&dcache_lock);
status = try_to_fill_dentry(dentry, 0);
if (status)
goto out_error;
- /*
- * The mount succeeded but if there is no root mount
- * it must be an autofs multi-mount with no root offset
- * so we don't need to follow the mount.
- */
- if (d_mountpoint(dentry)) {
- if (!autofs4_follow_mount(&nd->path.mnt,
- &nd->path.dentry)) {
- status = -ENOENT;
- goto out_error;
- }
- }
-
- goto done;
+ goto follow;
}
spin_unlock(&dcache_lock);
+follow:
+ /*
+ * If there is no root mount it must be an autofs
+ * multi-mount with no root offset so we don't need
+ * to follow it.
+ */
+ if (d_mountpoint(dentry)) {
+ if (!autofs4_follow_mount(&nd->path.mnt,
+ &nd->path.dentry)) {
+ status = -ENOENT;
+ goto out_error;
+ }
+ }
done:
return NULL;
int status = 1;
/* Pending dentry */
+ spin_lock(&sbi->fs_lock);
if (autofs4_ispending(dentry)) {
/* The daemon never causes a mount to trigger */
+ spin_unlock(&sbi->fs_lock);
+
if (oz_mode)
return 1;
+ /*
+ * If the directory has gone away due to an expire
+ * we have been called as ->d_revalidate() and so
+ * we need to return false and proceed to ->lookup().
+ */
+ if (autofs4_expire_wait(dentry) == -EAGAIN)
+ return 0;
+
/*
* A zero status is success otherwise we have a
* negative error code.
if (status == 0)
return 1;
- /*
- * A status of EAGAIN here means that the dentry has gone
- * away while waiting for an expire to complete. If we are
- * racing with expire lookup will wait for it so this must
- * be a revalidate and we need to send it to lookup.
- */
- if (status == -EAGAIN)
- return 0;
-
return status;
}
+ spin_unlock(&sbi->fs_lock);
/* Negative dentry.. invalidate if "old" */
if (dentry->d_inode == NULL)
DPRINTK("dentry=%p %.*s, emptydir",
dentry, dentry->d_name.len, dentry->d_name.name);
spin_unlock(&dcache_lock);
+
/* The daemon never causes a mount to trigger */
if (oz_mode)
return 1;
* so it must have been successful, so just wait for it.
*/
ino = autofs4_dentry_ino(expiring);
- while (ino && (ino->flags & AUTOFS_INF_EXPIRING)) {
- DPRINTK("wait for incomplete expire %p name=%.*s",
- expiring, expiring->d_name.len,
- expiring->d_name.name);
- autofs4_wait(sbi, expiring, NFY_NONE);
- DPRINTK("request completed");
- }
+ autofs4_expire_wait(expiring);
spin_lock(&sbi->lookup_lock);
if (!list_empty(&ino->expiring))
list_del_init(&ino->expiring);
projects / linux-2.6-omap-h63xx.git / blobdiff