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authorLinus Torvalds <torvalds@linux-foundation.org>2011-03-18 10:51:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-18 10:51:11 -0700
commitf539abece1b7e36fae6add4f9ea29203d40badcb (patch)
tree786c08f3131a1871ece13343c3fa3832930c1408 /fs
parent3f6f7e6d57b8a0ae2810ae7aac70c51b6f2a6304 (diff)
parent24ff6663ccfdaf088dfa7acae489cb11ed4f43c4 (diff)
downloadop-kernel-dev-f539abece1b7e36fae6add4f9ea29203d40badcb.zip
op-kernel-dev-f539abece1b7e36fae6add4f9ea29203d40badcb.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: fs: call security_d_instantiate in d_obtain_alias V2 lose 'mounting_here' argument in ->d_manage() don't pass 'mounting_here' flag to follow_down() change the locking order for namespace_sem fix deadlock in pivot_root() vfs: split off vfsmount-related parts of vfs_kern_mount() Some fixes for pstore kill simple_set_mnt()
Diffstat (limited to 'fs')
-rw-r--r--fs/autofs4/root.c6
-rw-r--r--fs/dcache.c3
-rw-r--r--fs/internal.h5
-rw-r--r--fs/namei.c9
-rw-r--r--fs/namespace.c292
-rw-r--r--fs/nfsd/vfs.c2
-rw-r--r--fs/pstore/inode.c116
-rw-r--r--fs/super.c96
8 files changed, 268 insertions, 261 deletions
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 014e7ab..e6f84d2 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -36,7 +36,7 @@ static long autofs4_root_compat_ioctl(struct file *,unsigned int,unsigned long);
static int autofs4_dir_open(struct inode *inode, struct file *file);
static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *);
static struct vfsmount *autofs4_d_automount(struct path *);
-static int autofs4_d_manage(struct dentry *, bool, bool);
+static int autofs4_d_manage(struct dentry *, bool);
static void autofs4_dentry_release(struct dentry *);
const struct file_operations autofs4_root_operations = {
@@ -446,7 +446,7 @@ done:
return NULL;
}
-int autofs4_d_manage(struct dentry *dentry, bool mounting_here, bool rcu_walk)
+int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
{
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
@@ -454,7 +454,7 @@ int autofs4_d_manage(struct dentry *dentry, bool mounting_here, bool rcu_walk)
dentry, dentry->d_name.len, dentry->d_name.name);
/* The daemon never waits. */
- if (autofs4_oz_mode(sbi) || mounting_here) {
+ if (autofs4_oz_mode(sbi)) {
if (!d_mountpoint(dentry))
return -EISDIR;
return 0;
diff --git a/fs/dcache.c b/fs/dcache.c
index 8b1f842..ad25c4c 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1612,10 +1612,13 @@ struct dentry *d_obtain_alias(struct inode *inode)
__bit_spin_unlock(0, (unsigned long *)&tmp->d_sb->s_anon.first);
spin_unlock(&tmp->d_lock);
spin_unlock(&inode->i_lock);
+ security_d_instantiate(tmp, inode);
return tmp;
out_iput:
+ if (res && !IS_ERR(res))
+ security_d_instantiate(res, inode);
iput(inode);
return res;
}
diff --git a/fs/internal.h b/fs/internal.h
index f3d15de..1719154 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -12,6 +12,7 @@
#include <linux/lglock.h>
struct super_block;
+struct file_system_type;
struct linux_binprm;
struct path;
@@ -61,8 +62,6 @@ extern int check_unsafe_exec(struct linux_binprm *);
extern int copy_mount_options(const void __user *, unsigned long *);
extern int copy_mount_string(const void __user *, char **);
-extern void free_vfsmnt(struct vfsmount *);
-extern struct vfsmount *alloc_vfsmnt(const char *);
extern unsigned int mnt_get_count(struct vfsmount *mnt);
extern struct vfsmount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
@@ -99,6 +98,8 @@ extern struct file *get_empty_filp(void);
extern int do_remount_sb(struct super_block *, int, void *, int);
extern void __put_super(struct super_block *sb);
extern void put_super(struct super_block *sb);
+extern struct dentry *mount_fs(struct file_system_type *,
+ int, const char *, void *);
/*
* open.c
diff --git a/fs/namei.c b/fs/namei.c
index b912b7a..5a9a6c3 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -933,8 +933,7 @@ static int follow_managed(struct path *path, unsigned flags)
if (managed & DCACHE_MANAGE_TRANSIT) {
BUG_ON(!path->dentry->d_op);
BUG_ON(!path->dentry->d_op->d_manage);
- ret = path->dentry->d_op->d_manage(path->dentry,
- false, false);
+ ret = path->dentry->d_op->d_manage(path->dentry, false);
if (ret < 0)
return ret == -EISDIR ? 0 : ret;
}
@@ -999,7 +998,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
struct vfsmount *mounted;
if (unlikely(path->dentry->d_flags & DCACHE_MANAGE_TRANSIT) &&
!reverse_transit &&
- path->dentry->d_op->d_manage(path->dentry, false, true) < 0)
+ path->dentry->d_op->d_manage(path->dentry, true) < 0)
return false;
mounted = __lookup_mnt(path->mnt, path->dentry, 1);
if (!mounted)
@@ -1065,7 +1064,7 @@ failed:
* Care must be taken as namespace_sem may be held (indicated by mounting_here
* being true).
*/
-int follow_down(struct path *path, bool mounting_here)
+int follow_down(struct path *path)
{
unsigned managed;
int ret;
@@ -1086,7 +1085,7 @@ int follow_down(struct path *path, bool mounting_here)
BUG_ON(!path->dentry->d_op);
BUG_ON(!path->dentry->d_op->d_manage);
ret = path->dentry->d_op->d_manage(
- path->dentry, mounting_here, false);
+ path->dentry, false);
if (ret < 0)
return ret == -EISDIR ? 0 : ret;
}
diff --git a/fs/namespace.c b/fs/namespace.c
index d751348..9263995 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -196,7 +196,7 @@ unsigned int mnt_get_count(struct vfsmount *mnt)
#endif
}
-struct vfsmount *alloc_vfsmnt(const char *name)
+static struct vfsmount *alloc_vfsmnt(const char *name)
{
struct vfsmount *mnt = kmem_cache_zalloc(mnt_cache, GFP_KERNEL);
if (mnt) {
@@ -466,15 +466,7 @@ static void __mnt_unmake_readonly(struct vfsmount *mnt)
br_write_unlock(vfsmount_lock);
}
-void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb)
-{
- mnt->mnt_sb = sb;
- mnt->mnt_root = dget(sb->s_root);
-}
-
-EXPORT_SYMBOL(simple_set_mnt);
-
-void free_vfsmnt(struct vfsmount *mnt)
+static void free_vfsmnt(struct vfsmount *mnt)
{
kfree(mnt->mnt_devname);
mnt_free_id(mnt);
@@ -678,6 +670,36 @@ static struct vfsmount *skip_mnt_tree(struct vfsmount *p)
return p;
}
+struct vfsmount *
+vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data)
+{
+ struct vfsmount *mnt;
+ struct dentry *root;
+
+ if (!type)
+ return ERR_PTR(-ENODEV);
+
+ mnt = alloc_vfsmnt(name);
+ if (!mnt)
+ return ERR_PTR(-ENOMEM);
+
+ if (flags & MS_KERNMOUNT)
+ mnt->mnt_flags = MNT_INTERNAL;
+
+ root = mount_fs(type, flags, name, data);
+ if (IS_ERR(root)) {
+ free_vfsmnt(mnt);
+ return ERR_CAST(root);
+ }
+
+ mnt->mnt_root = root;
+ mnt->mnt_sb = root->d_sb;
+ mnt->mnt_mountpoint = mnt->mnt_root;
+ mnt->mnt_parent = mnt;
+ return mnt;
+}
+EXPORT_SYMBOL_GPL(vfs_kern_mount);
+
static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root,
int flag)
{
@@ -1641,9 +1663,35 @@ static int attach_recursive_mnt(struct vfsmount *source_mnt,
return err;
}
+static int lock_mount(struct path *path)
+{
+ struct vfsmount *mnt;
+retry:
+ mutex_lock(&path->dentry->d_inode->i_mutex);
+ if (unlikely(cant_mount(path->dentry))) {
+ mutex_unlock(&path->dentry->d_inode->i_mutex);
+ return -ENOENT;
+ }
+ down_write(&namespace_sem);
+ mnt = lookup_mnt(path);
+ if (likely(!mnt))
+ return 0;
+ up_write(&namespace_sem);
+ mutex_unlock(&path->dentry->d_inode->i_mutex);
+ path_put(path);
+ path->mnt = mnt;
+ path->dentry = dget(mnt->mnt_root);
+ goto retry;
+}
+
+static void unlock_mount(struct path *path)
+{
+ up_write(&namespace_sem);
+ mutex_unlock(&path->dentry->d_inode->i_mutex);
+}
+
static int graft_tree(struct vfsmount *mnt, struct path *path)
{
- int err;
if (mnt->mnt_sb->s_flags & MS_NOUSER)
return -EINVAL;
@@ -1651,16 +1699,10 @@ static int graft_tree(struct vfsmount *mnt, struct path *path)
S_ISDIR(mnt->mnt_root->d_inode->i_mode))
return -ENOTDIR;
- err = -ENOENT;
- mutex_lock(&path->dentry->d_inode->i_mutex);
- if (cant_mount(path->dentry))
- goto out_unlock;
+ if (d_unlinked(path->dentry))
+ return -ENOENT;
- if (!d_unlinked(path->dentry))
- err = attach_recursive_mnt(mnt, path, NULL);
-out_unlock:
- mutex_unlock(&path->dentry->d_inode->i_mutex);
- return err;
+ return attach_recursive_mnt(mnt, path, NULL);
}
/*
@@ -1723,6 +1765,7 @@ static int do_change_type(struct path *path, int flag)
static int do_loopback(struct path *path, char *old_name,
int recurse)
{
+ LIST_HEAD(umount_list);
struct path old_path;
struct vfsmount *mnt = NULL;
int err = mount_is_safe(path);
@@ -1734,13 +1777,16 @@ static int do_loopback(struct path *path, char *old_name,
if (err)
return err;
- down_write(&namespace_sem);
+ err = lock_mount(path);
+ if (err)
+ goto out;
+
err = -EINVAL;
if (IS_MNT_UNBINDABLE(old_path.mnt))
- goto out;
+ goto out2;
if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
- goto out;
+ goto out2;
err = -ENOMEM;
if (recurse)
@@ -1749,20 +1795,18 @@ static int do_loopback(struct path *path, char *old_name,
mnt = clone_mnt(old_path.mnt, old_path.dentry, 0);
if (!mnt)
- goto out;
+ goto out2;
err = graft_tree(mnt, path);
if (err) {
- LIST_HEAD(umount_list);
-
br_write_lock(vfsmount_lock);
umount_tree(mnt, 0, &umount_list);
br_write_unlock(vfsmount_lock);
- release_mounts(&umount_list);
}
-
+out2:
+ unlock_mount(path);
+ release_mounts(&umount_list);
out:
- up_write(&namespace_sem);
path_put(&old_path);
return err;
}
@@ -1851,18 +1895,12 @@ static int do_move_mount(struct path *path, char *old_name)
if (err)
return err;
- down_write(&namespace_sem);
- err = follow_down(path, true);
+ err = lock_mount(path);
if (err < 0)
goto out;
err = -EINVAL;
if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
- goto out;
-
- err = -ENOENT;
- mutex_lock(&path->dentry->d_inode->i_mutex);
- if (cant_mount(path->dentry))
goto out1;
if (d_unlinked(path->dentry))
@@ -1904,16 +1942,87 @@ static int do_move_mount(struct path *path, char *old_name)
* automatically */
list_del_init(&old_path.mnt->mnt_expire);
out1:
- mutex_unlock(&path->dentry->d_inode->i_mutex);
+ unlock_mount(path);
out:
- up_write(&namespace_sem);
if (!err)
path_put(&parent_path);
path_put(&old_path);
return err;
}
-static int do_add_mount(struct vfsmount *, struct path *, int);
+static struct vfsmount *fs_set_subtype(struct vfsmount *mnt, const char *fstype)
+{
+ int err;
+ const char *subtype = strchr(fstype, '.');
+ if (subtype) {
+ subtype++;
+ err = -EINVAL;
+ if (!subtype[0])
+ goto err;
+ } else
+ subtype = "";
+
+ mnt->mnt_sb->s_subtype = kstrdup(subtype, GFP_KERNEL);
+ err = -ENOMEM;
+ if (!mnt->mnt_sb->s_subtype)
+ goto err;
+ return mnt;
+
+ err:
+ mntput(mnt);
+ return ERR_PTR(err);
+}
+
+struct vfsmount *
+do_kern_mount(const char *fstype, int flags, const char *name, void *data)
+{
+ struct file_system_type *type = get_fs_type(fstype);
+ struct vfsmount *mnt;
+ if (!type)
+ return ERR_PTR(-ENODEV);
+ mnt = vfs_kern_mount(type, flags, name, data);
+ if (!IS_ERR(mnt) && (type->fs_flags & FS_HAS_SUBTYPE) &&
+ !mnt->mnt_sb->s_subtype)
+ mnt = fs_set_subtype(mnt, fstype);
+ put_filesystem(type);
+ return mnt;
+}
+EXPORT_SYMBOL_GPL(do_kern_mount);
+
+/*
+ * add a mount into a namespace's mount tree
+ */
+static int do_add_mount(struct vfsmount *newmnt, struct path *path, int mnt_flags)
+{
+ int err;
+
+ mnt_flags &= ~(MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL);
+
+ err = lock_mount(path);
+ if (err)
+ return err;
+
+ err = -EINVAL;
+ if (!(mnt_flags & MNT_SHRINKABLE) && !check_mnt(path->mnt))
+ goto unlock;
+
+ /* Refuse the same filesystem on the same mount point */
+ err = -EBUSY;
+ if (path->mnt->mnt_sb == newmnt->mnt_sb &&
+ path->mnt->mnt_root == path->dentry)
+ goto unlock;
+
+ err = -EINVAL;
+ if (S_ISLNK(newmnt->mnt_root->d_inode->i_mode))
+ goto unlock;
+
+ newmnt->mnt_flags = mnt_flags;
+ err = graft_tree(newmnt, path);
+
+unlock:
+ unlock_mount(path);
+ return err;
+}
/*
* create a new mount for userspace and request it to be added into the
@@ -1973,43 +2082,6 @@ fail:
return err;
}
-/*
- * add a mount into a namespace's mount tree
- */
-static int do_add_mount(struct vfsmount *newmnt, struct path *path, int mnt_flags)
-{
- int err;
-
- mnt_flags &= ~(MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL);
-
- down_write(&namespace_sem);
- /* Something was mounted here while we slept */
- err = follow_down(path, true);
- if (err < 0)
- goto unlock;
-
- err = -EINVAL;
- if (!(mnt_flags & MNT_SHRINKABLE) && !check_mnt(path->mnt))
- goto unlock;
-
- /* Refuse the same filesystem on the same mount point */
- err = -EBUSY;
- if (path->mnt->mnt_sb == newmnt->mnt_sb &&
- path->mnt->mnt_root == path->dentry)
- goto unlock;
-
- err = -EINVAL;
- if (S_ISLNK(newmnt->mnt_root->d_inode->i_mode))
- goto unlock;
-
- newmnt->mnt_flags = mnt_flags;
- err = graft_tree(newmnt, path);
-
-unlock:
- up_write(&namespace_sem);
- return err;
-}
-
/**
* mnt_set_expiry - Put a mount on an expiration list
* @mnt: The mount to list.
@@ -2510,65 +2582,60 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
error = user_path_dir(new_root, &new);
if (error)
goto out0;
- error = -EINVAL;
- if (!check_mnt(new.mnt))
- goto out1;
error = user_path_dir(put_old, &old);
if (error)
goto out1;
error = security_sb_pivotroot(&old, &new);
- if (error) {
- path_put(&old);
- goto out1;
- }
+ if (error)
+ goto out2;
get_fs_root(current->fs, &root);
- down_write(&namespace_sem);
- mutex_lock(&old.dentry->d_inode->i_mutex);
+ error = lock_mount(&old);
+ if (error)
+ goto out3;
+
error = -EINVAL;
if (IS_MNT_SHARED(old.mnt) ||
IS_MNT_SHARED(new.mnt->mnt_parent) ||
IS_MNT_SHARED(root.mnt->mnt_parent))
- goto out2;
- if (!check_mnt(root.mnt))
- goto out2;
+ goto out4;
+ if (!check_mnt(root.mnt) || !check_mnt(new.mnt))
+ goto out4;
error = -ENOENT;
- if (cant_mount(old.dentry))
- goto out2;
if (d_unlinked(new.dentry))
- goto out2;
+ goto out4;
if (d_unlinked(old.dentry))
- goto out2;
+ goto out4;
error = -EBUSY;
if (new.mnt == root.mnt ||
old.mnt == root.mnt)
- goto out2; /* loop, on the same file system */
+ goto out4; /* loop, on the same file system */
error = -EINVAL;
if (root.mnt->mnt_root != root.dentry)
- goto out2; /* not a mountpoint */
+ goto out4; /* not a mountpoint */
if (root.mnt->mnt_parent == root.mnt)
- goto out2; /* not attached */
+ goto out4; /* not attached */
if (new.mnt->mnt_root != new.dentry)
- goto out2; /* not a mountpoint */
+ goto out4; /* not a mountpoint */
if (new.mnt->mnt_parent == new.mnt)
- goto out2; /* not attached */
+ goto out4; /* not attached */
/* make sure we can reach put_old from new_root */
tmp = old.mnt;
- br_write_lock(vfsmount_lock);
if (tmp != new.mnt) {
for (;;) {
if (tmp->mnt_parent == tmp)
- goto out3; /* already mounted on put_old */
+ goto out4; /* already mounted on put_old */
if (tmp->mnt_parent == new.mnt)
break;
tmp = tmp->mnt_parent;
}
if (!is_subdir(tmp->mnt_mountpoint, new.dentry))
- goto out3;
+ goto out4;
} else if (!is_subdir(old.dentry, new.dentry))
- goto out3;
+ goto out4;
+ br_write_lock(vfsmount_lock);
detach_mnt(new.mnt, &parent_path);
detach_mnt(root.mnt, &root_parent);
/* mount old root on put_old */
@@ -2578,22 +2645,21 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
touch_mnt_namespace(current->nsproxy->mnt_ns);
br_write_unlock(vfsmount_lock);
chroot_fs_refs(&root, &new);
-
error = 0;
- path_put(&root_parent);
- path_put(&parent_path);
-out2:
- mutex_unlock(&old.dentry->d_inode->i_mutex);
- up_write(&namespace_sem);
+out4:
+ unlock_mount(&old);
+ if (!error) {
+ path_put(&root_parent);
+ path_put(&parent_path);
+ }
+out3:
path_put(&root);
+out2:
path_put(&old);
out1:
path_put(&new);
out0:
return error;
-out3:
- br_write_unlock(vfsmount_lock);
- goto out2;
}
static void __init init_mount_tree(void)
@@ -2668,3 +2734,9 @@ void put_mnt_ns(struct mnt_namespace *ns)
kfree(ns);
}
EXPORT_SYMBOL(put_mnt_ns);
+
+struct vfsmount *kern_mount_data(struct file_system_type *type, void *data)
+{
+ return vfs_kern_mount(type, MS_KERNMOUNT, type->name, data);
+}
+EXPORT_SYMBOL_GPL(kern_mount_data);
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index da1d970..ff93025 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -87,7 +87,7 @@ nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
.dentry = dget(dentry)};
int err = 0;
- err = follow_down(&path, false);
+ err = follow_down(&path);
if (err < 0)
goto out;
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 549d245..0834223 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -40,9 +40,29 @@
struct pstore_private {
u64 id;
int (*erase)(u64);
+ ssize_t size;
+ char data[];
};
-#define pstore_get_inode ramfs_get_inode
+static int pstore_file_open(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct pstore_private *ps = file->private_data;
+
+ return simple_read_from_buffer(userbuf, count, ppos, ps->data, ps->size);
+}
+
+static const struct file_operations pstore_file_operations = {
+ .open = pstore_file_open,
+ .read = pstore_file_read,
+ .llseek = default_llseek,
+};
/*
* When a file is unlinked from our file system we call the
@@ -63,6 +83,30 @@ static const struct inode_operations pstore_dir_inode_operations = {
.unlink = pstore_unlink,
};
+static struct inode *pstore_get_inode(struct super_block *sb,
+ const struct inode *dir, int mode, dev_t dev)
+{
+ struct inode *inode = new_inode(sb);
+
+ if (inode) {
+ inode->i_ino = get_next_ino();
+ inode->i_uid = inode->i_gid = 0;
+ inode->i_mode = mode;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ switch (mode & S_IFMT) {
+ case S_IFREG:
+ inode->i_fop = &pstore_file_operations;
+ break;
+ case S_IFDIR:
+ inode->i_op = &pstore_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ inc_nlink(inode);
+ break;
+ }
+ }
+ return inode;
+}
+
static const struct super_operations pstore_ops = {
.statfs = simple_statfs,
.drop_inode = generic_delete_inode,
@@ -70,37 +114,10 @@ static const struct super_operations pstore_ops = {
};
static struct super_block *pstore_sb;
-static struct vfsmount *pstore_mnt;
int pstore_is_mounted(void)
{
- return pstore_mnt != NULL;
-}
-
-/*
- * Set up a file structure as if we had opened this file and
- * write our data to it.
- */
-static int pstore_writefile(struct inode *inode, struct dentry *dentry,
- char *data, size_t size)
-{
- struct file f;
- ssize_t n;
- mm_segment_t old_fs = get_fs();
-
- memset(&f, '0', sizeof f);
- f.f_mapping = inode->i_mapping;
- f.f_path.dentry = dentry;
- f.f_path.mnt = pstore_mnt;
- f.f_pos = 0;
- f.f_op = inode->i_fop;
- set_fs(KERNEL_DS);
- n = do_sync_write(&f, data, size, &f.f_pos);
- set_fs(old_fs);
-
- fsnotify_modify(&f);
-
- return n == size;
+ return pstore_sb != NULL;
}
/*
@@ -123,8 +140,7 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
inode = pstore_get_inode(pstore_sb, root->d_inode, S_IFREG | 0444, 0);
if (!inode)
goto fail;
- inode->i_uid = inode->i_gid = 0;
- private = kmalloc(sizeof *private, GFP_KERNEL);
+ private = kmalloc(sizeof *private + size, GFP_KERNEL);
if (!private)
goto fail_alloc;
private->id = id;
@@ -152,28 +168,19 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
if (IS_ERR(dentry))
goto fail_lockedalloc;
- d_add(dentry, inode);
-
- mutex_unlock(&root->d_inode->i_mutex);
-
- if (!pstore_writefile(inode, dentry, data, size))
- goto fail_write;
+ memcpy(private->data, data, size);
+ inode->i_size = private->size = size;
inode->i_private = private;
if (time.tv_sec)
inode->i_mtime = inode->i_ctime = time;
- return 0;
+ d_add(dentry, inode);
-fail_write:
- kfree(private);
- inode->i_nlink--;
- mutex_lock(&root->d_inode->i_mutex);
- d_delete(dentry);
- dput(dentry);
mutex_unlock(&root->d_inode->i_mutex);
- goto fail;
+
+ return 0;
fail_lockedalloc:
mutex_unlock(&root->d_inode->i_mutex);
@@ -225,32 +232,21 @@ fail:
return err;
}
-static int pstore_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data, struct vfsmount *mnt)
+static struct dentry *pstore_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
{
- struct dentry *root;
-
- root = mount_nodev(fs_type, flags, data, pstore_fill_super);
- if (IS_ERR(root))
- return -ENOMEM;
-
- mnt->mnt_root = root;
- mnt->mnt_sb = root->d_sb;
- pstore_mnt = mnt;
-
- return 0;
+ return mount_single(fs_type, flags, data, pstore_fill_super);
}
static void pstore_kill_sb(struct super_block *sb)
{
kill_litter_super(sb);
pstore_sb = NULL;
- pstore_mnt = NULL;
}
static struct file_system_type pstore_fs_type = {
.name = "pstore",
- .get_sb = pstore_get_sb,
+ .mount = pstore_mount,
.kill_sb = pstore_kill_sb,
};
diff --git a/fs/super.c b/fs/super.c
index 4bae0ef..e848649 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -910,29 +910,18 @@ struct dentry *mount_single(struct file_system_type *fs_type,
}
EXPORT_SYMBOL(mount_single);
-struct vfsmount *
-vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data)
+struct dentry *
+mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
{
- struct vfsmount *mnt;
struct dentry *root;
+ struct super_block *sb;
char *secdata = NULL;
- int error;
-
- if (!type)
- return ERR_PTR(-ENODEV);
-
- error = -ENOMEM;
- mnt = alloc_vfsmnt(name);
- if (!mnt)
- goto out;
-
- if (flags & MS_KERNMOUNT)
- mnt->mnt_flags = MNT_INTERNAL;
+ int error = -ENOMEM;
if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) {
secdata = alloc_secdata();
if (!secdata)
- goto out_mnt;
+ goto out;
error = security_sb_copy_data(data, secdata);
if (error)
@@ -944,13 +933,12 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
error = PTR_ERR(root);
goto out_free_secdata;
}
- mnt->mnt_root = root;
- mnt->mnt_sb = root->d_sb;
- BUG_ON(!mnt->mnt_sb);
- WARN_ON(!mnt->mnt_sb->s_bdi);
- mnt->mnt_sb->s_flags |= MS_BORN;
+ sb = root->d_sb;
+ BUG_ON(!sb);
+ WARN_ON(!sb->s_bdi);
+ sb->s_flags |= MS_BORN;
- error = security_sb_kern_mount(mnt->mnt_sb, flags, secdata);
+ error = security_sb_kern_mount(sb, flags, secdata);
if (error)
goto out_sb;
@@ -961,27 +949,21 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
* violate this rule. This warning should be either removed or
* converted to a BUG() in 2.6.34.
*/
- WARN((mnt->mnt_sb->s_maxbytes < 0), "%s set sb->s_maxbytes to "
- "negative value (%lld)\n", type->name, mnt->mnt_sb->s_maxbytes);
+ WARN((sb->s_maxbytes < 0), "%s set sb->s_maxbytes to "
+ "negative value (%lld)\n", type->name, sb->s_maxbytes);
- mnt->mnt_mountpoint = mnt->mnt_root;
- mnt->mnt_parent = mnt;
- up_write(&mnt->mnt_sb->s_umount);
+ up_write(&sb->s_umount);
free_secdata(secdata);
- return mnt;
+ return root;
out_sb:
- dput(mnt->mnt_root);
- deactivate_locked_super(mnt->mnt_sb);
+ dput(root);
+ deactivate_locked_super(sb);
out_free_secdata:
free_secdata(secdata);
-out_mnt:
- free_vfsmnt(mnt);
out:
return ERR_PTR(error);
}
-EXPORT_SYMBOL_GPL(vfs_kern_mount);
-
/**
* freeze_super - lock the filesystem and force it into a consistent state
* @sb: the super to lock
@@ -1071,49 +1053,3 @@ out:
return 0;
}
EXPORT_SYMBOL(thaw_super);
-
-static struct vfsmount *fs_set_subtype(struct vfsmount *mnt, const char *fstype)
-{
- int err;
- const char *subtype = strchr(fstype, '.');
- if (subtype) {
- subtype++;
- err = -EINVAL;
- if (!subtype[0])
- goto err;
- } else
- subtype = "";
-
- mnt->mnt_sb->s_subtype = kstrdup(subtype, GFP_KERNEL);
- err = -ENOMEM;
- if (!mnt->mnt_sb->s_subtype)
- goto err;
- return mnt;
-
- err:
- mntput(mnt);
- return ERR_PTR(err);
-}
-
-struct vfsmount *
-do_kern_mount(const char *fstype, int flags, const char *name, void *data)
-{
- struct file_system_type *type = get_fs_type(fstype);
- struct vfsmount *mnt;
- if (!type)
- return ERR_PTR(-ENODEV);
- mnt = vfs_kern_mount(type, flags, name, data);
- if (!IS_ERR(mnt) && (type->fs_flags & FS_HAS_SUBTYPE) &&
- !mnt->mnt_sb->s_subtype)
- mnt = fs_set_subtype(mnt, fstype);
- put_filesystem(type);
- return mnt;
-}
-EXPORT_SYMBOL_GPL(do_kern_mount);
-
-struct vfsmount *kern_mount_data(struct file_system_type *type, void *data)
-{
- return vfs_kern_mount(type, MS_KERNMOUNT, type->name, data);
-}
-
-EXPORT_SYMBOL_GPL(kern_mount_data);
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