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authorDavid Howells <dhowells@redhat.com>2018-11-04 17:28:36 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2019-01-31 01:44:26 +0300
commit8d0347f6c3a9d4953ddd636a31c6584da082e084 (patch)
treea8dec0e9d854bad8732ae41084e6f7c980713758 /include/linux/fs_context.h
parentc9ce29ed795fae86e594844857fad1b0d3be85f4 (diff)
downloadlinux-8d0347f6c3a9d4953ddd636a31c6584da082e084.tar.xz
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 <dhowells@redhat.com> Co-developed-by: Al Viro <viro@zeniv.linux.org.uk> 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 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);