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authorDavid Howells <dhowells@redhat.com>2019-03-21 12:22:36 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2019-09-05 21:34:23 +0300
commit43ce4c1feadbc84c772518a2d1974f6ba1b15089 (patch)
treee3bc42b51b6c0ca84b4a7c99f676999ed0bf892f /include/linux/fs_context.h
parent0f071004109d9c8de7023b9a64fa2ba3fa87cbed (diff)
downloadlinux-43ce4c1feadbc84c772518a2d1974f6ba1b15089.tar.xz
vfs: Add a single-or-reconfig keying to vfs_get_super()
Add an additional keying mode to vfs_get_super() to indicate that only a single superblock should exist in the system, and that, if it does, further mounts should invoke reconfiguration upon it. This allows mount_single() to be replaced. [Fix by Eric Biggers folded in] Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/fs_context.h')
-rw-r--r--include/linux/fs_context.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h
index 84a5eaa09f19..0424df7f6e6b 100644
--- a/include/linux/fs_context.h
+++ b/include/linux/fs_context.h
@@ -141,6 +141,7 @@ extern void put_fs_context(struct fs_context *fc);
*/
enum vfs_get_super_keying {
vfs_get_single_super, /* Only one such superblock may exist */
+ vfs_get_single_reconf_super, /* As above, but reconfigure if it exists */
vfs_get_keyed_super, /* Superblocks with different s_fs_info keys may exist */
vfs_get_independent_super, /* Multiple independent superblocks may exist */
};
@@ -155,6 +156,9 @@ extern int get_tree_nodev(struct fs_context *fc,
extern int get_tree_single(struct fs_context *fc,
int (*fill_super)(struct super_block *sb,
struct fs_context *fc));
+extern int get_tree_single_reconf(struct fs_context *fc,
+ int (*fill_super)(struct super_block *sb,
+ struct fs_context *fc));
extern int get_tree_keyed(struct fs_context *fc,
int (*fill_super)(struct super_block *sb,
struct fs_context *fc),