#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/stat.h>
+#include <linux/slab.h>
#include <linux/param.h>
#include <linux/time.h>
#include "autofs_i.h"
.rmdir = autofs4_dir_rmdir,
};
+static void autofs4_add_active(struct dentry *dentry)
+{
+ struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+ struct autofs_info *ino = autofs4_dentry_ino(dentry);
+ if (ino) {
+ spin_lock(&sbi->lookup_lock);
+ if (!ino->active_count) {
+ if (list_empty(&ino->active))
+ list_add(&ino->active, &sbi->active_list);
+ }
+ ino->active_count++;
+ spin_unlock(&sbi->lookup_lock);
+ }
+ return;
+}
+
+static void autofs4_del_active(struct dentry *dentry)
+{
+ struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+ struct autofs_info *ino = autofs4_dentry_ino(dentry);
+ if (ino) {
+ spin_lock(&sbi->lookup_lock);
+ ino->active_count--;
+ if (!ino->active_count) {
+ if (!list_empty(&ino->active))
+ list_del_init(&ino->active);
+ }
+ spin_unlock(&sbi->lookup_lock);
+ }
+ return;
+}
+
+static unsigned int autofs4_need_mount(unsigned int flags)
+{
+ unsigned int res = 0;
+ if (flags & (TRIGGER_FLAGS | TRIGGER_INTENTS))
+ res = 1;
+ return res;
+}
+
static int autofs4_dir_open(struct inode *inode, struct file *file)
{
struct dentry *dentry = file->f_path.dentry;
* it.
*/
spin_lock(&dcache_lock);
- if (!d_mountpoint(dentry) && __simple_empty(dentry)) {
+ if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
spin_unlock(&dcache_lock);
return -ENOENT;
}
/* Turn this into a real negative dentry? */
if (status == -ENOENT) {
- spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags &= ~AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
return status;
} else if (status) {
/* Return a negative dentry, but leave it "pending" */
return status;
}
/* Trigger mount for path component or follow link */
- } else if (dentry->d_flags & DCACHE_AUTOFS_PENDING ||
- flags & (TRIGGER_FLAGS | TRIGGER_INTENTS) ||
- current->link_count) {
+ } else if (ino->flags & AUTOFS_INF_PENDING ||
+ autofs4_need_mount(flags)) {
DPRINTK("waiting for mount name=%.*s",
dentry->d_name.len, dentry->d_name.name);
- spin_lock(&dentry->d_lock);
- dentry->d_flags |= DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags |= AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
status = autofs4_wait(sbi, dentry, NFY_MOUNT);
DPRINTK("mount done status=%d", status);
if (status) {
- spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags &= ~AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
return status;
}
}
if (ino)
ino->last_used = jiffies;
- spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags &= ~AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
return 0;
}
nd->flags);
/*
* For an expire of a covered direct or offset mount we need
- * to beeak out of follow_down() at the autofs mount trigger
+ * to break 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 (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))
+ if (!follow_down(&nd->path))
goto done;
goto follow;
}
autofs4_expire_wait(dentry);
/* 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))
+ lookup_type = autofs4_need_mount(nd->flags);
+ spin_lock(&sbi->fs_lock);
+ spin_lock(&dcache_lock);
+ if (!(lookup_type || ino->flags & AUTOFS_INF_PENDING)) {
+ spin_unlock(&dcache_lock);
+ spin_unlock(&sbi->fs_lock);
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.
*/
- spin_lock(&dcache_lock);
- if (dentry->d_flags & DCACHE_AUTOFS_PENDING ||
- (!d_mountpoint(dentry) && __simple_empty(dentry))) {
+ if (ino->flags & AUTOFS_INF_PENDING ||
+ (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs))) {
spin_unlock(&dcache_lock);
+ spin_unlock(&sbi->fs_lock);
- status = try_to_fill_dentry(dentry, 0);
+ status = try_to_fill_dentry(dentry, nd->flags);
if (status)
goto out_error;
goto follow;
}
spin_unlock(&dcache_lock);
+ spin_unlock(&sbi->fs_lock);
follow:
/*
* If there is no root mount it must be an autofs
* to follow it.
*/
if (d_mountpoint(dentry)) {
- if (!autofs4_follow_mount(&nd->path.mnt,
- &nd->path.dentry)) {
+ if (!autofs4_follow_mount(&nd->path)) {
status = -ENOENT;
goto out_error;
}
/* Check for a non-mountpoint directory with no contents */
spin_lock(&dcache_lock);
if (S_ISDIR(dentry->d_inode->i_mode) &&
- !d_mountpoint(dentry) &&
- __simple_empty(dentry)) {
+ !d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
DPRINTK("dentry=%p %.*s, emptydir",
dentry, dentry->d_name.len, dentry->d_name.name);
spin_unlock(&dcache_lock);
.d_release = autofs4_dentry_release,
};
-static struct dentry *autofs4_lookup_active(struct autofs_sb_info *sbi, struct dentry *parent, struct qstr *name)
+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;
unsigned int len = name->len;
unsigned int hash = name->hash;
const unsigned char *str = name->name;
head = &sbi->active_list;
list_for_each(p, head) {
struct autofs_info *ino;
- struct dentry *dentry;
+ struct dentry *active;
struct qstr *qstr;
ino = list_entry(p, struct autofs_info, active);
- dentry = ino->dentry;
+ active = ino->dentry;
- spin_lock(&dentry->d_lock);
+ spin_lock(&active->d_lock);
/* Already gone? */
- if (atomic_read(&dentry->d_count) == 0)
+ if (atomic_read(&active->d_count) == 0)
goto next;
- qstr = &dentry->d_name;
+ qstr = &active->d_name;
- if (dentry->d_name.hash != hash)
+ if (active->d_name.hash != hash)
goto next;
- if (dentry->d_parent != parent)
+ if (active->d_parent != parent)
goto next;
if (qstr->len != len)
if (memcmp(qstr->name, str, len))
goto next;
- if (d_unhashed(dentry)) {
- dget(dentry);
- spin_unlock(&dentry->d_lock);
+ if (d_unhashed(active)) {
+ dget(active);
+ spin_unlock(&active->d_lock);
spin_unlock(&sbi->lookup_lock);
spin_unlock(&dcache_lock);
- return dentry;
+ return active;
}
next:
- spin_unlock(&dentry->d_lock);
+ spin_unlock(&active->d_lock);
}
spin_unlock(&sbi->lookup_lock);
spin_unlock(&dcache_lock);
return NULL;
}
-static struct dentry *autofs4_lookup_expiring(struct autofs_sb_info *sbi, struct dentry *parent, struct qstr *name)
+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;
unsigned int len = name->len;
unsigned int hash = name->hash;
const unsigned char *str = name->name;
head = &sbi->expiring_list;
list_for_each(p, head) {
struct autofs_info *ino;
- struct dentry *dentry;
+ struct dentry *expiring;
struct qstr *qstr;
ino = list_entry(p, struct autofs_info, expiring);
- dentry = ino->dentry;
+ expiring = ino->dentry;
- spin_lock(&dentry->d_lock);
+ spin_lock(&expiring->d_lock);
/* Bad luck, we've already been dentry_iput */
- if (!dentry->d_inode)
+ if (!expiring->d_inode)
goto next;
- qstr = &dentry->d_name;
+ qstr = &expiring->d_name;
- if (dentry->d_name.hash != hash)
+ if (expiring->d_name.hash != hash)
goto next;
- if (dentry->d_parent != parent)
+ if (expiring->d_parent != parent)
goto next;
if (qstr->len != len)
if (memcmp(qstr->name, str, len))
goto next;
- if (d_unhashed(dentry)) {
- dget(dentry);
- spin_unlock(&dentry->d_lock);
+ if (d_unhashed(expiring)) {
+ dget(expiring);
+ spin_unlock(&expiring->d_lock);
spin_unlock(&sbi->lookup_lock);
spin_unlock(&dcache_lock);
- return dentry;
+ return expiring;
}
next:
- spin_unlock(&dentry->d_lock);
+ spin_unlock(&expiring->d_lock);
}
spin_unlock(&sbi->lookup_lock);
spin_unlock(&dcache_lock);
{
struct autofs_sb_info *sbi;
struct autofs_info *ino;
- struct dentry *expiring, *unhashed;
+ struct dentry *expiring, *active;
int oz_mode;
DPRINTK("name = %.*s",
DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
current->pid, task_pgrp_nr(current), sbi->catatonic, oz_mode);
- expiring = autofs4_lookup_expiring(sbi, dentry->d_parent, &dentry->d_name);
- if (expiring) {
- /*
- * If we are racing with expire the request might not
- * be quite complete but the directory has been removed
- * so it must have been successful, so just wait for it.
- */
- ino = autofs4_dentry_ino(expiring);
- autofs4_expire_wait(expiring);
- spin_lock(&sbi->lookup_lock);
- if (!list_empty(&ino->expiring))
- list_del_init(&ino->expiring);
- spin_unlock(&sbi->lookup_lock);
- dput(expiring);
- }
-
- unhashed = autofs4_lookup_active(sbi, dentry->d_parent, &dentry->d_name);
- if (unhashed)
- dentry = unhashed;
- else {
+ active = autofs4_lookup_active(dentry);
+ if (active) {
+ dentry = active;
+ ino = autofs4_dentry_ino(dentry);
+ } else {
/*
* Mark the dentry incomplete but don't hash it. We do this
* to serialize our inode creation operations (symlink and
dentry->d_fsdata = ino;
ino->dentry = dentry;
- spin_lock(&sbi->lookup_lock);
- list_add(&ino->active, &sbi->active_list);
- spin_unlock(&sbi->lookup_lock);
+ autofs4_add_active(dentry);
d_instantiate(dentry, NULL);
}
if (!oz_mode) {
- spin_lock(&dentry->d_lock);
- dentry->d_flags |= DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
- if (dentry->d_op && dentry->d_op->d_revalidate) {
- mutex_unlock(&dir->i_mutex);
- (dentry->d_op->d_revalidate)(dentry, nd);
- mutex_lock(&dir->i_mutex);
+ mutex_unlock(&dir->i_mutex);
+ expiring = autofs4_lookup_expiring(dentry);
+ if (expiring) {
+ /*
+ * If we are racing with expire the request might not
+ * be quite complete but the directory has been removed
+ * so it must have been successful, so just wait for it.
+ */
+ autofs4_expire_wait(expiring);
+ autofs4_del_expiring(expiring);
+ dput(expiring);
}
+
+ spin_lock(&sbi->fs_lock);
+ ino->flags |= AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
+ if (dentry->d_op && dentry->d_op->d_revalidate)
+ (dentry->d_op->d_revalidate)(dentry, nd);
+ mutex_lock(&dir->i_mutex);
}
/*
* If we are still pending, check if we had to handle
* a signal. If so we can force a restart..
*/
- if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
+ if (ino->flags & AUTOFS_INF_PENDING) {
/* See if we were interrupted */
if (signal_pending(current)) {
sigset_t *sigset = ¤t->pending.signal;
if (sigismember (sigset, SIGKILL) ||
sigismember (sigset, SIGQUIT) ||
sigismember (sigset, SIGINT)) {
- if (unhashed)
- dput(unhashed);
+ if (active)
+ dput(active);
return ERR_PTR(-ERESTARTNOINTR);
}
}
if (!oz_mode) {
- spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags &= ~AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
}
}
else
dentry = ERR_PTR(-ENOENT);
- if (unhashed)
- dput(unhashed);
+ if (active)
+ dput(active);
return dentry;
}
- if (unhashed)
- return unhashed;
+ if (active)
+ return active;
return NULL;
}
if (!ino)
return -ENOMEM;
- spin_lock(&sbi->lookup_lock);
- if (!list_empty(&ino->active))
- list_del_init(&ino->active);
- spin_unlock(&sbi->lookup_lock);
+ autofs4_del_active(dentry);
ino->size = strlen(symname);
cp = kmalloc(ino->size + 1, GFP_KERNEL);
dir->i_mtime = CURRENT_TIME;
spin_lock(&dcache_lock);
- spin_lock(&sbi->lookup_lock);
- if (list_empty(&ino->expiring))
- list_add(&ino->expiring, &sbi->expiring_list);
- spin_unlock(&sbi->lookup_lock);
+ autofs4_add_expiring(dentry);
spin_lock(&dentry->d_lock);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
spin_unlock(&dcache_lock);
return -ENOTEMPTY;
}
- spin_lock(&sbi->lookup_lock);
- if (list_empty(&ino->expiring))
- list_add(&ino->expiring, &sbi->expiring_list);
- spin_unlock(&sbi->lookup_lock);
+ autofs4_add_expiring(dentry);
spin_lock(&dentry->d_lock);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
if (!ino)
return -ENOMEM;
- spin_lock(&sbi->lookup_lock);
- if (!list_empty(&ino->active))
- list_del_init(&ino->active);
- spin_unlock(&sbi->lookup_lock);
+ autofs4_del_active(dentry);
inode = autofs4_get_inode(dir->i_sb, ino);
if (!inode) {
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff