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staging: erofs: kill all failure handling in fill_super() 

.kill_sb() will do that instead in order to remove duplicated code.

Note that the initialzation of managed_cache is now moved
after s_root is assigned since it's more preferred to iput()
in .put_super() and all inodes should be evicted before
the end of generic_shutdown_super(sb).

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190731155752.210602-12-gaoxiang25@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2019-07-31 23:57:41 +08:00 committed by Greg Kroah-Hartman
parent 9e794de573
commit 8f7acdae2c
1 changed files with 63 additions and 77 deletions
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140
drivers/staging/erofs/super.c
View File

@ -343,12 +343,13 @@ static const struct address_space_operations managed_cache_aops = {
.invalidatepage = managed_cache_invalidatepage,
};
static struct inode *erofs_init_managed_cache(struct super_block *sb)
static int erofs_init_managed_cache(struct super_block *sb)
{
struct inode *inode = new_inode(sb);
struct erofs_sb_info *const sbi = EROFS_SB(sb);
struct inode *const inode = new_inode(sb);
if (unlikely(!inode))
return ERR_PTR(-ENOMEM);
return -ENOMEM;
set_nlink(inode, 1);
inode->i_size = OFFSET_MAX;
@ -357,37 +358,38 @@ static struct inode *erofs_init_managed_cache(struct super_block *sb)
mapping_set_gfp_mask(inode->i_mapping,
GFP_NOFS | __GFP_HIGHMEM |
__GFP_MOVABLE | __GFP_NOFAIL);
return inode;
sbi->managed_cache = inode;
return 0;
}
#else
static int erofs_init_managed_cache(struct super_block *sb) { return 0; }
#endif
static int erofs_fill_super(struct super_block *sb, void *data, int silent)
{
struct inode *inode;
struct erofs_sb_info *sbi;
int err = -EINVAL;
int err;
infoln("fill_super, device -> %s", sb->s_id);
infoln("options -> %s", (char *)data);
sb->s_magic = EROFS_SUPER_MAGIC;
if (unlikely(!sb_set_blocksize(sb, EROFS_BLKSIZ))) {
errln("failed to set erofs blksize");
goto err;
return -EINVAL;
}
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (unlikely(!sbi)) {
err = -ENOMEM;
goto err;
}
sb->s_fs_info = sbi;
if (unlikely(!sbi))
return -ENOMEM;
sb->s_fs_info = sbi;
err = superblock_read(sb);
if (err)
goto err_sbread;
return err;
sb->s_magic = EROFS_SUPER_MAGIC;
sb->s_flags |= SB_RDONLY | SB_NOATIME;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_time_gran = 1;
@ -397,13 +399,12 @@ static int erofs_fill_super(struct super_block *sb, void *data, int silent)
#ifdef CONFIG_EROFS_FS_XATTR
sb->s_xattr = erofs_xattr_handlers;
#endif
/* set erofs default mount options */
default_options(sbi);
err = parse_options(sb, data);
if (err)
goto err_parseopt;
if (unlikely(err))
return err;
if (!silent)
infoln("root inode @ nid %llu", ROOT_NID(sbi));
@ -417,80 +418,31 @@ static int erofs_fill_super(struct super_block *sb, void *data, int silent)
INIT_RADIX_TREE(&sbi->workstn_tree, GFP_ATOMIC);
#endif
#ifdef EROFS_FS_HAS_MANAGED_CACHE
sbi->managed_cache = erofs_init_managed_cache(sb);
if (IS_ERR(sbi->managed_cache)) {
err = PTR_ERR(sbi->managed_cache);
goto err_init_managed_cache;
}
#endif
/* get the root inode */
inode = erofs_iget(sb, ROOT_NID(sbi), true);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto err_iget;
}
if (IS_ERR(inode))
return PTR_ERR(inode);
if (!S_ISDIR(inode->i_mode)) {
if (unlikely(!S_ISDIR(inode->i_mode))) {
errln("rootino(nid %llu) is not a directory(i_mode %o)",
ROOT_NID(sbi), inode->i_mode);
err = -EINVAL;
iput(inode);
goto err_iget;
return -EINVAL;
}
sb->s_root = d_make_root(inode);
if (!sb->s_root) {
err = -ENOMEM;
goto err_iget;
}
if (unlikely(!sb->s_root))
return -ENOMEM;
erofs_shrinker_register(sb);
/* sb->s_umount is already locked, SB_ACTIVE and SB_BORN are not set */
err = erofs_init_managed_cache(sb);
if (unlikely(err))
return err;
if (!silent)
infoln("mounted on %s with opts: %s.", sb->s_id, (char *)data);
return 0;
/*
* please add a label for each exit point and use
* the following name convention, thus new features
* can be integrated easily without renaming labels.
*/
err_iget:
#ifdef EROFS_FS_HAS_MANAGED_CACHE
iput(sbi->managed_cache);
err_init_managed_cache:
#endif
err_parseopt:
err_sbread:
sb->s_fs_info = NULL;
kfree(sbi);
err:
return err;
}
/*
* could be triggered after deactivate_locked_super()
* is called, thus including umount and failed to initialize.
*/
static void erofs_put_super(struct super_block *sb)
{
struct erofs_sb_info *sbi = EROFS_SB(sb);
/* for cases which are failed in "read_super" */
if (!sbi)
return;
WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
infoln("unmounted for %s", sb->s_id);
erofs_shrinker_unregister(sb);
#ifdef EROFS_FS_HAS_MANAGED_CACHE
iput(sbi->managed_cache);
#endif
kfree(sbi);
sb->s_fs_info = NULL;
}
static struct dentry *erofs_mount(struct file_system_type *fs_type, int flags,
@ -499,11 +451,45 @@ static struct dentry *erofs_mount(struct file_system_type *fs_type, int flags,
return mount_bdev(fs_type, flags, dev_name, data, erofs_fill_super);
}
/*
* could be triggered after deactivate_locked_super()
* is called, thus including umount and failed to initialize.
*/
static void erofs_kill_sb(struct super_block *sb)
{
struct erofs_sb_info *sbi;
WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
infoln("unmounting for %s", sb->s_id);
kill_block_super(sb);
sbi = EROFS_SB(sb);
if (!sbi)
return;
kfree(sbi);
sb->s_fs_info = NULL;
}
/* called when ->s_root is non-NULL */
static void erofs_put_super(struct super_block *sb)
{
struct erofs_sb_info *const sbi = EROFS_SB(sb);
DBG_BUGON(!sbi);
erofs_shrinker_unregister(sb);
#ifdef EROFS_FS_HAS_MANAGED_CACHE
iput(sbi->managed_cache);
sbi->managed_cache = NULL;
#endif
}
static struct file_system_type erofs_fs_type = {
.owner = THIS_MODULE,
.name = "erofs",
.mount = erofs_mount,
.kill_sb = kill_block_super,
.kill_sb = erofs_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("erofs");