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Message-ID: <20190731155752.210602-12-gaoxiang25@huawei.com>
Date: Wed, 31 Jul 2019 23:57:41 +0800
From: Gao Xiang <gaoxiang25@...wei.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Chao Yu <yuchao0@...wei.com>, <devel@...verdev.osuosl.org>
CC: LKML <linux-kernel@...r.kernel.org>,
<linux-erofs@...ts.ozlabs.org>, "Chao Yu" <chao@...nel.org>,
Miao Xie <miaoxie@...wei.com>, <weidu.du@...wei.com>,
Fang Wei <fangwei1@...wei.com>,
Gao Xiang <gaoxiang25@...wei.com>
Subject: [PATCH v2 11/22] 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@...iv.linux.org.uk>
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
---
drivers/staging/erofs/super.c | 118 +++++++++++++++-------------------
1 file changed, 52 insertions(+), 66 deletions(-)
diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c
index bfb6e1e09781..7c31030daf4e 100644
--- a/drivers/staging/erofs/super.c
+++ b/drivers/staging/erofs/super.c
@@ -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));
@@ -417,93 +418,78 @@ 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;
+}
+
+static struct dentry *erofs_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data)
+{
+ 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_put_super(struct super_block *sb)
+static void erofs_kill_sb(struct super_block *sb)
{
- struct erofs_sb_info *sbi = EROFS_SB(sb);
+ struct erofs_sb_info *sbi;
+
+ WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
+ infoln("unmounting for %s", sb->s_id);
- /* for cases which are failed in "read_super" */
+ kill_block_super(sb);
+
+ sbi = EROFS_SB(sb);
if (!sbi)
return;
+ kfree(sbi);
+ sb->s_fs_info = NULL;
+}
- WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
+/* 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);
- infoln("unmounted for %s", sb->s_id);
+ DBG_BUGON(!sbi);
erofs_shrinker_unregister(sb);
#ifdef EROFS_FS_HAS_MANAGED_CACHE
iput(sbi->managed_cache);
+ sbi->managed_cache = NULL;
#endif
- kfree(sbi);
- sb->s_fs_info = NULL;
-}
-
-static struct dentry *erofs_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data)
-{
- return mount_bdev(fs_type, flags, dev_name, data, erofs_fill_super);
}
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");
--
2.17.1
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