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fs: export sget_dev()

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They will be used for mtd devices as well.

Acked-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Jan Kara <jack@suse.cz>
Message-Id: <20230829-vfs-super-mtd-v1-1-fecb572e5df3@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2023-08-29 17:23:56 +02:00
parent b97d64c722
commit 69881be3d9
2 changed files with 46 additions and 19 deletions
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64
fs/super.c
View File

@ -1373,6 +1373,50 @@ int get_tree_keyed(struct fs_context *fc,
} }
EXPORT_SYMBOL(get_tree_keyed); EXPORT_SYMBOL(get_tree_keyed);
static int set_bdev_super(struct super_block *s, void *data)
{
s->s_dev = *(dev_t *)data;
return 0;
}
static int super_s_dev_set(struct super_block *s, struct fs_context *fc)
{
return set_bdev_super(s, fc->sget_key);
}
static int super_s_dev_test(struct super_block *s, struct fs_context *fc)
{
return !(s->s_iflags & SB_I_RETIRED) &&
s->s_dev == *(dev_t *)fc->sget_key;
}
/**
* sget_dev - Find or create a superblock by device number
* @fc: Filesystem context.
* @dev: device number
*
* Find or create a superblock using the provided device number that
* will be stored in fc->sget_key.
*
* If an extant superblock is matched, then that will be returned with
* an elevated reference count that the caller must transfer or discard.
*
* If no match is made, a new superblock will be allocated and basic
* initialisation will be performed (s_type, s_fs_info, s_id, s_dev will
* be set). The superblock will be published and it will be returned in
* a partially constructed state with SB_BORN and SB_ACTIVE as yet
* unset.
*
* Return: an existing or newly created superblock on success, an error
* pointer on failure.
*/
struct super_block *sget_dev(struct fs_context *fc, dev_t dev)
{
fc->sget_key = &dev;
return sget_fc(fc, super_s_dev_test, super_s_dev_set);
}
EXPORT_SYMBOL(sget_dev);
#ifdef CONFIG_BLOCK #ifdef CONFIG_BLOCK
/* /*
* Lock a super block that the callers holds a reference to. * Lock a super block that the callers holds a reference to.
@ -1431,23 +1475,6 @@ const struct blk_holder_ops fs_holder_ops = {
}; };
EXPORT_SYMBOL_GPL(fs_holder_ops); EXPORT_SYMBOL_GPL(fs_holder_ops);
static int set_bdev_super(struct super_block *s, void *data)
{
s->s_dev = *(dev_t *)data;
return 0;
}
static int set_bdev_super_fc(struct super_block *s, struct fs_context *fc)
{
return set_bdev_super(s, fc->sget_key);
}
static int test_bdev_super_fc(struct super_block *s, struct fs_context *fc)
{
return !(s->s_iflags & SB_I_RETIRED) &&
s->s_dev == *(dev_t *)fc->sget_key;
}
int setup_bdev_super(struct super_block *sb, int sb_flags, int setup_bdev_super(struct super_block *sb, int sb_flags,
struct fs_context *fc) struct fs_context *fc)
{ {
@ -1525,8 +1552,7 @@ int get_tree_bdev(struct fs_context *fc,
} }
fc->sb_flags |= SB_NOSEC; fc->sb_flags |= SB_NOSEC;
fc->sget_key = &dev; s = sget_dev(fc, dev);
s = sget_fc(fc, test_bdev_super_fc, set_bdev_super_fc);
if (IS_ERR(s)) if (IS_ERR(s))
return PTR_ERR(s); return PTR_ERR(s);

1
include/linux/fs.h
View File

@ -2397,6 +2397,7 @@ struct super_block *sget(struct file_system_type *type,
int (*test)(struct super_block *,void *), int (*test)(struct super_block *,void *),
int (*set)(struct super_block *,void *), int (*set)(struct super_block *,void *),
int flags, void *data); int flags, void *data);
struct super_block *sget_dev(struct fs_context *fc, dev_t dev);
/* Alas, no aliases. Too much hassle with bringing module.h everywhere */ /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
#define fops_get(fops) \ #define fops_get(fops) \