From 8d0347f6c3a9d4953ddd636a31c6584da082e084 Mon Sep 17 00:00:00 2001 From: David Howells Date: Sun, 4 Nov 2018 09:28:36 -0500 Subject: convert do_remount_sb() to fs_context Replace do_remount_sb() with a function, reconfigure_super(), that's fs_context aware. The fs_context is expected to be parameterised already and have ->root pointing to the superblock to be reconfigured. A legacy wrapper is provided that is intended to be called from the fs_context ops when those appear, but for now is called directly from reconfigure_super(). This wrapper invokes the ->remount_fs() superblock op for the moment. It is intended that the remount_fs() op will be phased out. The fs_context->purpose is set to FS_CONTEXT_FOR_RECONFIGURE to indicate that the context is being used for reconfiguration. do_umount_root() is provided to consolidate remount-to-R/O for umount and emergency remount by creating a context and invoking reconfiguration. do_remount(), do_umount() and do_emergency_remount_callback() are switched to use the new process. [AV -- fold UMOUNT and EMERGENCY_REMOUNT in; fixes the umount / bug, gets rid of pointless complexity] [AV -- set ->net_ns in all cases; nfs remount will need that] [AV -- shift security_sb_remount() call into reconfigure_super(); the callers that didn't do security_sb_remount() have NULL fc->security anyway, so it's a no-op for them] Signed-off-by: David Howells Co-developed-by: Al Viro Signed-off-by: Al Viro --- include/linux/fs_context.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/fs_context.h') diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h index 9805514444c9..98772f882a3e 100644 --- a/include/linux/fs_context.h +++ b/include/linux/fs_context.h @@ -25,6 +25,7 @@ struct user_namespace; enum fs_context_purpose { FS_CONTEXT_FOR_MOUNT, /* New superblock for explicit mount */ + FS_CONTEXT_FOR_RECONFIGURE, /* Superblock reconfiguration (remount) */ }; /* @@ -57,6 +58,9 @@ struct fs_context { */ extern struct fs_context *fs_context_for_mount(struct file_system_type *fs_type, unsigned int sb_flags); +extern struct fs_context *fs_context_for_reconfigure(struct dentry *dentry, + unsigned int sb_flags, + unsigned int sb_flags_mask); extern int vfs_get_tree(struct fs_context *fc); extern void put_fs_context(struct fs_context *fc); -- cgit