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-rw-r--r--fs/autofs4/autofs_i.h6
-rw-r--r--fs/autofs4/dev-ioctl.c195
-rw-r--r--fs/autofs4/expire.c15
-rw-r--r--fs/autofs4/root.c7
-rw-r--r--fs/autofs4/waitq.c22
5 files changed, 81 insertions, 164 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index b7ff33c6310..8f7cdde4173 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -223,12 +223,12 @@ int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
void autofs4_catatonic_mode(struct autofs_sb_info *);
-static inline int autofs4_follow_mount(struct vfsmount **mnt, struct dentry **dentry)
+static inline int autofs4_follow_mount(struct path *path)
{
int res = 0;
- while (d_mountpoint(*dentry)) {
- int followed = follow_down(mnt, dentry);
+ while (d_mountpoint(path->dentry)) {
+ int followed = follow_down(path);
if (!followed)
break;
res = 1;
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 84168c0dcc2..f3da2eb51f5 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -192,77 +192,42 @@ static int autofs_dev_ioctl_protosubver(struct file *fp,
return 0;
}
-/*
- * Walk down the mount stack looking for an autofs mount that
- * has the requested device number (aka. new_encode_dev(sb->s_dev).
- */
-static int autofs_dev_ioctl_find_super(struct nameidata *nd, dev_t devno)
+static int find_autofs_mount(const char *pathname,
+ struct path *res,
+ int test(struct path *path, void *data),
+ void *data)
{
- struct dentry *dentry;
- struct inode *inode;
- struct super_block *sb;
- dev_t s_dev;
- unsigned int err;
-
+ struct path path;
+ int err = kern_path(pathname, 0, &path);
+ if (err)
+ return err;
err = -ENOENT;
-
- /* Lookup the dentry name at the base of our mount point */
- dentry = d_lookup(nd->path.dentry, &nd->last);
- if (!dentry)
- goto out;
-
- dput(nd->path.dentry);
- nd->path.dentry = dentry;
-
- /* And follow the mount stack looking for our autofs mount */
- while (follow_down(&nd->path.mnt, &nd->path.dentry)) {
- inode = nd->path.dentry->d_inode;
- if (!inode)
- break;
-
- sb = inode->i_sb;
- s_dev = new_encode_dev(sb->s_dev);
- if (devno == s_dev) {
- if (sb->s_magic == AUTOFS_SUPER_MAGIC) {
+ while (path.dentry == path.mnt->mnt_root) {
+ if (path.mnt->mnt_sb->s_magic == AUTOFS_SUPER_MAGIC) {
+ if (test(&path, data)) {
+ path_get(&path);
+ if (!err) /* already found some */
+ path_put(res);
+ *res = path;
err = 0;
- break;
}
}
+ if (!follow_up(&path))
+ break;
}
-out:
+ path_put(&path);
return err;
}
-/*
- * Walk down the mount stack looking for an autofs mount that
- * has the requested mount type (ie. indirect, direct or offset).
- */
-static int autofs_dev_ioctl_find_sbi_type(struct nameidata *nd, unsigned int type)
+static int test_by_dev(struct path *path, void *p)
{
- struct dentry *dentry;
- struct autofs_info *ino;
- unsigned int err;
-
- err = -ENOENT;
-
- /* Lookup the dentry name at the base of our mount point */
- dentry = d_lookup(nd->path.dentry, &nd->last);
- if (!dentry)
- goto out;
-
- dput(nd->path.dentry);
- nd->path.dentry = dentry;
+ return path->mnt->mnt_sb->s_dev == *(dev_t *)p;
+}
- /* And follow the mount stack looking for our autofs mount */
- while (follow_down(&nd->path.mnt, &nd->path.dentry)) {
- ino = autofs4_dentry_ino(nd->path.dentry);
- if (ino && ino->sbi->type & type) {
- err = 0;
- break;
- }
- }
-out:
- return err;
+static int test_by_type(struct path *path, void *p)
+{
+ struct autofs_info *ino = autofs4_dentry_ino(path->dentry);
+ return ino && ino->sbi->type & *(unsigned *)p;
}
static void autofs_dev_ioctl_fd_install(unsigned int fd, struct file *file)
@@ -283,31 +248,25 @@ static void autofs_dev_ioctl_fd_install(unsigned int fd, struct file *file)
* Open a file descriptor on the autofs mount point corresponding
* to the given path and device number (aka. new_encode_dev(sb->s_dev)).
*/
-static int autofs_dev_ioctl_open_mountpoint(const char *path, dev_t devid)
+static int autofs_dev_ioctl_open_mountpoint(const char *name, dev_t devid)
{
- struct file *filp;
- struct nameidata nd;
int err, fd;
fd = get_unused_fd();
if (likely(fd >= 0)) {
- /* Get nameidata of the parent directory */
- err = path_lookup(path, LOOKUP_PARENT, &nd);
+ struct file *filp;
+ struct path path;
+
+ err = find_autofs_mount(name, &path, test_by_dev, &devid);
if (err)
goto out;
/*
- * Search down, within the parent, looking for an
- * autofs super block that has the device number
+ * Find autofs super block that has the device number
* corresponding to the autofs fs we want to open.
*/
- err = autofs_dev_ioctl_find_super(&nd, devid);
- if (err) {
- path_put(&nd.path);
- goto out;
- }
- filp = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY,
+ filp = dentry_open(path.dentry, path.mnt, O_RDONLY,
current_cred());
if (IS_ERR(filp)) {
err = PTR_ERR(filp);
@@ -340,7 +299,7 @@ static int autofs_dev_ioctl_openmount(struct file *fp,
param->ioctlfd = -1;
path = param->path;
- devid = param->openmount.devid;
+ devid = new_decode_dev(param->openmount.devid);
err = 0;
fd = autofs_dev_ioctl_open_mountpoint(path, devid);
@@ -475,8 +434,7 @@ static int autofs_dev_ioctl_requester(struct file *fp,
struct autofs_dev_ioctl *param)
{
struct autofs_info *ino;
- struct nameidata nd;
- const char *path;
+ struct path path;
dev_t devid;
int err = -ENOENT;
@@ -485,32 +443,24 @@ static int autofs_dev_ioctl_requester(struct file *fp,
goto out;
}
- path = param->path;
- devid = new_encode_dev(sbi->sb->s_dev);
+ devid = sbi->sb->s_dev;
param->requester.uid = param->requester.gid = -1;
- /* Get nameidata of the parent directory */
- err = path_lookup(path, LOOKUP_PARENT, &nd);
+ err = find_autofs_mount(param->path, &path, test_by_dev, &devid);
if (err)
goto out;
- err = autofs_dev_ioctl_find_super(&nd, devid);
- if (err)
- goto out_release;
-
- ino = autofs4_dentry_ino(nd.path.dentry);
+ ino = autofs4_dentry_ino(path.dentry);
if (ino) {
err = 0;
- autofs4_expire_wait(nd.path.dentry);
+ autofs4_expire_wait(path.dentry);
spin_lock(&sbi->fs_lock);
param->requester.uid = ino->uid;
param->requester.gid = ino->gid;
spin_unlock(&sbi->fs_lock);
}
-
-out_release:
- path_put(&nd.path);
+ path_put(&path);
out:
return err;
}
@@ -569,8 +519,8 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp,
struct autofs_sb_info *sbi,
struct autofs_dev_ioctl *param)
{
- struct nameidata nd;
- const char *path;
+ struct path path;
+ const char *name;
unsigned int type;
unsigned int devid, magic;
int err = -ENOENT;
@@ -580,71 +530,46 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp,
goto out;
}
- path = param->path;
+ name = param->path;
type = param->ismountpoint.in.type;
param->ismountpoint.out.devid = devid = 0;
param->ismountpoint.out.magic = magic = 0;
if (!fp || param->ioctlfd == -1) {
- if (autofs_type_any(type)) {
- struct super_block *sb;
-
- err = path_lookup(path, LOOKUP_FOLLOW, &nd);
- if (err)
- goto out;
-
- sb = nd.path.dentry->d_sb;
- devid = new_encode_dev(sb->s_dev);
- } else {
- struct autofs_info *ino;
-
- err = path_lookup(path, LOOKUP_PARENT, &nd);
- if (err)
- goto out;
-
- err = autofs_dev_ioctl_find_sbi_type(&nd, type);
- if (err)
- goto out_release;
-
- ino = autofs4_dentry_ino(nd.path.dentry);
- devid = autofs4_get_dev(ino->sbi);
- }
-
+ if (autofs_type_any(type))
+ err = kern_path(name, LOOKUP_FOLLOW, &path);
+ else
+ err = find_autofs_mount(name, &path, test_by_type, &type);
+ if (err)
+ goto out;
+ devid = new_encode_dev(path.mnt->mnt_sb->s_dev);
err = 0;
- if (nd.path.dentry->d_inode &&
- nd.path.mnt->mnt_root == nd.path.dentry) {
+ if (path.dentry->d_inode &&
+ path.mnt->mnt_root == path.dentry) {
err = 1;
- magic = nd.path.dentry->d_inode->i_sb->s_magic;
+ magic = path.dentry->d_inode->i_sb->s_magic;
}
} else {
- dev_t dev = autofs4_get_dev(sbi);
+ dev_t dev = sbi->sb->s_dev;
- err = path_lookup(path, LOOKUP_PARENT, &nd);
+ err = find_autofs_mount(name, &path, test_by_dev, &dev);
if (err)
goto out;
- err = autofs_dev_ioctl_find_super(&nd, dev);
- if (err)
- goto out_release;
-
- devid = dev;
+ devid = new_encode_dev(dev);
- err = have_submounts(nd.path.dentry);
+ err = have_submounts(path.dentry);
- if (nd.path.mnt->mnt_mountpoint != nd.path.mnt->mnt_root) {
- if (follow_down(&nd.path.mnt, &nd.path.dentry)) {
- struct inode *inode = nd.path.dentry->d_inode;
- magic = inode->i_sb->s_magic;
- }
+ if (path.mnt->mnt_mountpoint != path.mnt->mnt_root) {
+ if (follow_down(&path))
+ magic = path.mnt->mnt_sb->s_magic;
}
}
param->ismountpoint.out.devid = devid;
param->ismountpoint.out.magic = magic;
-
-out_release:
- path_put(&nd.path);
+ path_put(&path);
out:
return err;
}
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 3077d8f1652..aa39ae83f01 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -48,19 +48,19 @@ static inline int autofs4_can_expire(struct dentry *dentry,
static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
{
struct dentry *top = dentry;
+ struct path path = {.mnt = mnt, .dentry = dentry};
int status = 1;
DPRINTK("dentry %p %.*s",
dentry, (int)dentry->d_name.len, dentry->d_name.name);
- mntget(mnt);
- dget(dentry);
+ path_get(&path);
- if (!follow_down(&mnt, &dentry))
+ if (!follow_down(&path))
goto done;
- if (is_autofs4_dentry(dentry)) {
- struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+ if (is_autofs4_dentry(path.dentry)) {
+ struct autofs_sb_info *sbi = autofs4_sbi(path.dentry->d_sb);
/* This is an autofs submount, we can't expire it */
if (autofs_type_indirect(sbi->type))
@@ -70,7 +70,7 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
* Otherwise it's an offset mount and we need to check
* if we can umount its mount, if there is one.
*/
- if (!d_mountpoint(dentry)) {
+ if (!d_mountpoint(path.dentry)) {
status = 0;
goto done;
}
@@ -86,8 +86,7 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
status = 0;
done:
DPRINTK("returning = %d", status);
- dput(dentry);
- mntput(mnt);
+ path_put(&path);
return status;
}
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index e383bf0334f..b96a3c57359 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -181,7 +181,7 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
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.
*/
@@ -190,7 +190,7 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
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;
}
@@ -230,8 +230,7 @@ follow:
* 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;
}
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index eeb24684590..2341375386f 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -297,20 +297,14 @@ static int validate_request(struct autofs_wait_queue **wait,
*/
if (notify == NFY_MOUNT) {
/*
- * If the dentry isn't hashed just go ahead and try the
- * mount again with a new wait (not much else we can do).
- */
- if (!d_unhashed(dentry)) {
- /*
- * But if the dentry is hashed, that means that we
- * got here through the revalidate path. Thus, we
- * need to check if the dentry has been mounted
- * while we waited on the wq_mutex. If it has,
- * simply return success.
- */
- if (d_mountpoint(dentry))
- return 0;
- }
+ * If the dentry was successfully mounted while we slept
+ * on the wait queue mutex we can return success. If it
+ * isn't mounted (doesn't have submounts for the case of
+ * a multi-mount with no mount at it's base) we can
+ * continue on and create a new request.
+ */
+ if (have_submounts(dentry))
+ return 0;
}
return 1;
generated by cgit (git 2.34.1) at 2024-11-16 18:21:34 +0000