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authorAl Viro <viro@zeniv.linux.org.uk>2010-12-18 10:44:00 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2011-01-12 20:02:43 -0500
commit3d23985d6cfa7908e46fd0c62a2ee84faffe4d8b (patch)
tree5561a4f3eb3ef265de2b6d224194ff58b713fe0a
parent6cc9c1d2c1414ef67f465462aa96a5d1fed12f5d (diff)
switch fat to ->s_d_op, close exportfs races there
don't bother with lock_super() in fat_fill_super() callers, while we are at it - there won't be any concurrency anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/fat/fat.h3
-rw-r--r--fs/fat/inode.c13
-rw-r--r--fs/fat/namei_msdos.c27
-rw-r--r--fs/fat/namei_vfat.c27
4 files changed, 25 insertions, 45 deletions
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index d75a77f85c28..f50408901f7e 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -319,7 +319,8 @@ extern struct inode *fat_build_inode(struct super_block *sb,
struct msdos_dir_entry *de, loff_t i_pos);
extern int fat_sync_inode(struct inode *inode);
extern int fat_fill_super(struct super_block *sb, void *data, int silent,
- const struct inode_operations *fs_dir_inode_ops, int isvfat);
+ const struct inode_operations *fs_dir_inode_ops,
+ int isvfat, void (*setup)(struct super_block *));
extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
struct inode *i2);
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 206351af7c58..86753fe10bd1 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -703,7 +703,6 @@ static struct dentry *fat_fh_to_dentry(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type)
{
struct inode *inode = NULL;
- struct dentry *result;
u32 *fh = fid->raw;
if (fh_len < 5 || fh_type != 3)
@@ -748,10 +747,7 @@ static struct dentry *fat_fh_to_dentry(struct super_block *sb,
* the fat_iget lookup again. If that fails, then we are totally out
* of luck. But all that is for another day
*/
- result = d_obtain_alias(inode);
- if (!IS_ERR(result))
- d_set_d_op(result, sb->s_root->d_op);
- return result;
+ return d_obtain_alias(inode);
}
static int
@@ -799,8 +795,6 @@ static struct dentry *fat_get_parent(struct dentry *child)
brelse(bh);
parent = d_obtain_alias(inode);
- if (!IS_ERR(parent))
- d_set_d_op(parent, sb->s_root->d_op);
out:
unlock_super(sb);
@@ -1244,7 +1238,8 @@ static int fat_read_root(struct inode *inode)
* Read the super block of an MS-DOS FS.
*/
int fat_fill_super(struct super_block *sb, void *data, int silent,
- const struct inode_operations *fs_dir_inode_ops, int isvfat)
+ const struct inode_operations *fs_dir_inode_ops, int isvfat,
+ void (*setup)(struct super_block *))
{
struct inode *root_inode = NULL, *fat_inode = NULL;
struct buffer_head *bh;
@@ -1280,6 +1275,8 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
if (error)
goto out_fail;
+ setup(sb); /* flavour-specific stuff that needs options */
+
error = -EIO;
sb_min_blocksize(sb, 512);
bh = sb_bread(sb, 0);
diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index 35ffe43afa4b..711499040eb6 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -227,11 +227,7 @@ static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
}
out:
unlock_super(sb);
- d_set_d_op(dentry, &msdos_dentry_operations);
- dentry = d_splice_alias(inode, dentry);
- if (dentry)
- d_set_d_op(dentry, &msdos_dentry_operations);
- return dentry;
+ return d_splice_alias(inode, dentry);
error:
unlock_super(sb);
@@ -661,21 +657,16 @@ static const struct inode_operations msdos_dir_inode_operations = {
.getattr = fat_getattr,
};
-static int msdos_fill_super(struct super_block *sb, void *data, int silent)
+static void setup(struct super_block *sb)
{
- int res;
-
- lock_super(sb);
- res = fat_fill_super(sb, data, silent, &msdos_dir_inode_operations, 0);
- if (res) {
- unlock_super(sb);
- return res;
- }
-
+ sb->s_d_op = &msdos_dentry_operations;
sb->s_flags |= MS_NOATIME;
- d_set_d_op(sb->s_root, &msdos_dentry_operations);
- unlock_super(sb);
- return 0;
+}
+
+static int msdos_fill_super(struct super_block *sb, void *data, int silent)
+{
+ return fat_fill_super(sb, data, silent, &msdos_dir_inode_operations,
+ 0, setup);
}
static struct dentry *msdos_mount(struct file_system_type *fs_type,
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index e3ffc5e12332..f88f752babd9 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -772,13 +772,10 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
out:
unlock_super(sb);
- d_set_d_op(dentry, sb->s_root->d_op);
dentry->d_time = dentry->d_parent->d_inode->i_version;
dentry = d_splice_alias(inode, dentry);
- if (dentry) {
- d_set_d_op(dentry, sb->s_root->d_op);
+ if (dentry)
dentry->d_time = dentry->d_parent->d_inode->i_version;
- }
return dentry;
error:
@@ -1066,24 +1063,18 @@ static const struct inode_operations vfat_dir_inode_operations = {
.getattr = fat_getattr,
};
-static int vfat_fill_super(struct super_block *sb, void *data, int silent)
+static void setup(struct super_block *sb)
{
- int res;
-
- lock_super(sb);
- res = fat_fill_super(sb, data, silent, &vfat_dir_inode_operations, 1);
- if (res) {
- unlock_super(sb);
- return res;
- }
-
if (MSDOS_SB(sb)->options.name_check != 's')
- d_set_d_op(sb->s_root, &vfat_ci_dentry_ops);
+ sb->s_d_op = &vfat_ci_dentry_ops;
else
- d_set_d_op(sb->s_root, &vfat_dentry_ops);
+ sb->s_d_op = &vfat_dentry_ops;
+}
- unlock_super(sb);
- return 0;
+static int vfat_fill_super(struct super_block *sb, void *data, int silent)
+{
+ return fat_fill_super(sb, data, silent, &vfat_dir_inode_operations,
+ 1, setup);
}
static struct dentry *vfat_mount(struct file_system_type *fs_type,