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authorChristian Brauner <brauner@kernel.org>2023-08-29 17:23:56 +0200
committerChristian Brauner <brauner@kernel.org>2023-08-31 12:47:15 +0200
commit69881be3d9a00cca770886af40913cfc5274b2d0 (patch)
tree124dadc371d6a72d61bd0da37b8d23abf8731d95 /fs/super.c
parentMerge tag '6.6-rc-smb3-client-fixes-part1' of git://git.samba.org/sfrench/cif... (diff)
downloadlinux-69881be3d9a00cca770886af40913cfc5274b2d0.tar.xz
linux-69881be3d9a00cca770886af40913cfc5274b2d0.zip
fs: export sget_dev()
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>
Diffstat (limited to 'fs/super.c')
-rw-r--r--fs/super.c64
1 files changed, 45 insertions, 19 deletions
diff --git a/fs/super.c b/fs/super.c
index bd8dcfc822c3..2d762ce67f6e 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1373,6 +1373,50 @@ int get_tree_keyed(struct fs_context *fc,
}
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
/*
* 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);
-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,
struct fs_context *fc)
{
@@ -1525,8 +1552,7 @@ int get_tree_bdev(struct fs_context *fc,
}
fc->sb_flags |= SB_NOSEC;
- fc->sget_key = &dev;
- s = sget_fc(fc, test_bdev_super_fc, set_bdev_super_fc);
+ s = sget_dev(fc, dev);
if (IS_ERR(s))
return PTR_ERR(s);