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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>
This commit is contained in:
Al Viro 2010-12-18 10:44:00 -05:00
parent 6cc9c1d2c1
commit 3d23985d6c
4 changed files with 27 additions and 47 deletions
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3
fs/fat/fat.h
View File

@ -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);

13
fs/fat/inode.c
View File

@ -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);

27
fs/fat/namei_msdos.c
View File

@ -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 void setup(struct super_block *sb)
{
sb->s_d_op = &msdos_dentry_operations;
sb->s_flags |= MS_NOATIME;
}
static int msdos_fill_super(struct super_block *sb, void *data, int silent)
{
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_flags |= MS_NOATIME;
d_set_d_op(sb->s_root, &msdos_dentry_operations);
unlock_super(sb);
return 0;
return fat_fill_super(sb, data, silent, &msdos_dir_inode_operations,
0, setup);
}
static struct dentry *msdos_mount(struct file_system_type *fs_type,

31
fs/fat/namei_vfat.c
View File

@ -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 void setup(struct super_block *sb)
{
if (MSDOS_SB(sb)->options.name_check != 's')
sb->s_d_op = &vfat_ci_dentry_ops;
else
sb->s_d_op = &vfat_dentry_ops;
}
static int vfat_fill_super(struct super_block *sb, void *data, int silent)
{
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);
else
d_set_d_op(sb->s_root, &vfat_dentry_ops);
unlock_super(sb);
return 0;
return fat_fill_super(sb, data, silent, &vfat_dir_inode_operations,
1, setup);
}
static struct dentry *vfat_mount(struct file_system_type *fs_type,