[PATCH RFC 1/2] fs: pass sb_flags to submount

[Li Lingfeng]

From: Li Lingfeng <lilingfeng3@xxxxxxxxxx>

This commit has no functional change.
Get sb_flags by nameidata, and pass it to submount.

Signed-off-by: Li Lingfeng <lilingfeng3@xxxxxxxxxx>
---
 fs/afs/internal.h          | 2 +-
 fs/afs/mntpt.c             | 4 ++--
 fs/autofs/root.c           | 4 ++--
 fs/debugfs/inode.c         | 2 +-
 fs/fs_context.c            | 5 +++--
 fs/fuse/dir.c              | 4 ++--
 fs/namei.c                 | 3 ++-
 fs/nfs/internal.h          | 2 +-
 fs/nfs/namespace.c         | 4 ++--
 fs/smb/client/cifsfs.h     | 2 +-
 fs/smb/client/namespace.c  | 2 +-
 include/linux/dcache.h     | 2 +-
 include/linux/fs_context.h | 3 ++-
 13 files changed, 21 insertions(+), 18 deletions(-)

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 6e1d3c4daf72..dc07446e6378 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1295,7 +1295,7 @@ extern const struct inode_operations afs_mntpt_inode_operations;
 extern const struct inode_operations afs_autocell_inode_operations;
 extern const struct file_operations afs_mntpt_file_operations;
 
-extern struct vfsmount *afs_d_automount(struct path *);
+extern struct vfsmount *afs_d_automount(struct path *, unsigned int);
 extern void afs_mntpt_kill_timer(void);
 
 /*
diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index 297487ee8323..3519deab514f 100644
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -161,7 +161,7 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
 
 	BUG_ON(!d_inode(mntpt));
 
-	fc = fs_context_for_submount(&afs_fs_type, mntpt);
+	fc = fs_context_for_submount(&afs_fs_type, mntpt, 0);
 	if (IS_ERR(fc))
 		return ERR_CAST(fc);
 
@@ -178,7 +178,7 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
 /*
  * handle an automount point
  */
-struct vfsmount *afs_d_automount(struct path *path)
+struct vfsmount *afs_d_automount(struct path *path, unsigned int sb_flags)
 {
 	struct vfsmount *newmnt;
 
diff --git a/fs/autofs/root.c b/fs/autofs/root.c
index 530d18827e35..f7294d3a089f 100644
--- a/fs/autofs/root.c
+++ b/fs/autofs/root.c
@@ -25,7 +25,7 @@ static long autofs_root_compat_ioctl(struct file *,
 static int autofs_dir_open(struct inode *inode, struct file *file);
 static struct dentry *autofs_lookup(struct inode *,
 				    struct dentry *, unsigned int);
-static struct vfsmount *autofs_d_automount(struct path *);
+static struct vfsmount *autofs_d_automount(struct path *, unsigned int);
 static int autofs_d_manage(const struct path *, bool);
 static void autofs_dentry_release(struct dentry *);
 
@@ -328,7 +328,7 @@ static struct dentry *autofs_mountpoint_changed(struct path *path)
 	return path->dentry;
 }
 
-static struct vfsmount *autofs_d_automount(struct path *path)
+static struct vfsmount *autofs_d_automount(struct path *path, unsigned int sb_flags)
 {
 	struct dentry *dentry = path->dentry;
 	struct autofs_sb_info *sbi = autofs_sbi(dentry->d_sb);
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index dc51df0b118d..a2cdab95d12a 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -229,7 +229,7 @@ static void debugfs_release_dentry(struct dentry *dentry)
 	kfree(fsd);
 }
 
-static struct vfsmount *debugfs_automount(struct path *path)
+static struct vfsmount *debugfs_automount(struct path *path, unsigned int sb_flags)
 {
 	struct debugfs_fsdata *fsd = path->dentry->d_fsdata;
 
diff --git a/fs/fs_context.c b/fs/fs_context.c
index 98589aae5208..95367dc7dc40 100644
--- a/fs/fs_context.c
+++ b/fs/fs_context.c
@@ -352,12 +352,13 @@ EXPORT_SYMBOL(fs_context_for_reconfigure);
  * the fc->security object is inherited from @reference (if needed).
  */
 struct fs_context *fs_context_for_submount(struct file_system_type *type,
-					   struct dentry *reference)
+					   struct dentry *reference,
+					   unsigned int sb_flags)
 {
 	struct fs_context *fc;
 	int ret;
 
-	fc = alloc_fs_context(type, reference, 0, 0, FS_CONTEXT_FOR_SUBMOUNT);
+	fc = alloc_fs_context(type, reference, sb_flags, 0, FS_CONTEXT_FOR_SUBMOUNT);
 	if (IS_ERR(fc))
 		return fc;
 
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 2b0d4781f394..88bd5aec11e7 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -305,13 +305,13 @@ static int fuse_dentry_delete(const struct dentry *dentry)
  * as the root), and return that mount so it can be auto-mounted on
  * @path.
  */
-static struct vfsmount *fuse_dentry_automount(struct path *path)
+static struct vfsmount *fuse_dentry_automount(struct path *path, unsigned int sb_flags)
 {
 	struct fs_context *fsc;
 	struct vfsmount *mnt;
 	struct fuse_inode *mp_fi = get_fuse_inode(d_inode(path->dentry));
 
-	fsc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry);
+	fsc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry, 0);
 	if (IS_ERR(fsc))
 		return ERR_CAST(fsc);
 
diff --git a/fs/namei.c b/fs/namei.c
index 37fb0a8aa09a..445de9fcef38 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1345,6 +1345,7 @@ static bool choose_mountpoint(struct mount *m, const struct path *root,
 static int follow_automount(struct path *path, int *count, unsigned lookup_flags)
 {
 	struct dentry *dentry = path->dentry;
+	struct nameidata *nd = container_of(count, struct nameidata, total_link_count);
 
 	/* We don't want to mount if someone's just doing a stat -
 	 * unless they're stat'ing a directory and appended a '/' to
@@ -1365,7 +1366,7 @@ static int follow_automount(struct path *path, int *count, unsigned lookup_flags
 	if (count && (*count)++ >= MAXSYMLINKS)
 		return -ELOOP;
 
-	return finish_automount(dentry->d_op->d_automount(path), path);
+	return finish_automount(dentry->d_op->d_automount(path, nd->root.mnt->mnt_sb->s_flags), path);
 }
 
 /*
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 9f0f4534744b..f0e35e0d05c9 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -484,7 +484,7 @@ static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
 #define NFS_PATH_CANONICAL 1
 extern char *nfs_path(char **p, struct dentry *dentry,
 		      char *buffer, ssize_t buflen, unsigned flags);
-extern struct vfsmount *nfs_d_automount(struct path *path);
+extern struct vfsmount *nfs_d_automount(struct path *path, unsigned int);
 int nfs_submount(struct fs_context *, struct nfs_server *);
 int nfs_do_submount(struct fs_context *);
 
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index e7494cdd957e..887aeacedebd 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -142,7 +142,7 @@ EXPORT_SYMBOL_GPL(nfs_path);
  * situation, and that different filesystems may want to use
  * different security flavours.
  */
-struct vfsmount *nfs_d_automount(struct path *path)
+struct vfsmount *nfs_d_automount(struct path *path, unsigned int sb_flags)
 {
 	struct nfs_fs_context *ctx;
 	struct fs_context *fc;
@@ -158,7 +158,7 @@ struct vfsmount *nfs_d_automount(struct path *path)
 	/* Open a new filesystem context, transferring parameters from the
 	 * parent superblock, including the network namespace.
 	 */
-	fc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry);
+	fc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry, 0);
 	if (IS_ERR(fc))
 		return ERR_CAST(fc);
 
diff --git a/fs/smb/client/cifsfs.h b/fs/smb/client/cifsfs.h
index 62d5fee3e5eb..eec5d5fa42a5 100644
--- a/fs/smb/client/cifsfs.h
+++ b/fs/smb/client/cifsfs.h
@@ -113,7 +113,7 @@ extern int cifs_readdir(struct file *file, struct dir_context *ctx);
 extern const struct dentry_operations cifs_dentry_ops;
 extern const struct dentry_operations cifs_ci_dentry_ops;
 
-extern struct vfsmount *cifs_d_automount(struct path *path);
+extern struct vfsmount *cifs_d_automount(struct path *path, unsigned int sb_flags);
 
 /* Functions related to symlinks */
 extern const char *cifs_get_link(struct dentry *, struct inode *,
diff --git a/fs/smb/client/namespace.c b/fs/smb/client/namespace.c
index 4a517b280f2b..81640e6b2d3f 100644
--- a/fs/smb/client/namespace.c
+++ b/fs/smb/client/namespace.c
@@ -254,7 +254,7 @@ static struct vfsmount *cifs_do_automount(struct path *path)
 /*
  * Attempt to automount the referral
  */
-struct vfsmount *cifs_d_automount(struct path *path)
+struct vfsmount *cifs_d_automount(struct path *path, unsigned int sb_flags)
 {
 	struct vfsmount *newmnt;
 
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index bf53e3894aae..864b0cd1c0c9 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -142,7 +142,7 @@ struct dentry_operations {
 	void (*d_prune)(struct dentry *);
 	void (*d_iput)(struct dentry *, struct inode *);
 	char *(*d_dname)(struct dentry *, char *, int);
-	struct vfsmount *(*d_automount)(struct path *);
+	struct vfsmount *(*d_automount)(struct path *, unsigned int sb_flags);
 	int (*d_manage)(const struct path *, bool);
 	struct dentry *(*d_real)(struct dentry *, enum d_real_type type);
 } ____cacheline_aligned;
diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h
index c13e99cbbf81..920bcbfaff2e 100644
--- a/include/linux/fs_context.h
+++ b/include/linux/fs_context.h
@@ -130,7 +130,8 @@ extern struct fs_context *fs_context_for_reconfigure(struct dentry *dentry,
 						unsigned int sb_flags,
 						unsigned int sb_flags_mask);
 extern struct fs_context *fs_context_for_submount(struct file_system_type *fs_type,
-						struct dentry *reference);
+						struct dentry *reference,
+						unsigned int sb_flags);
 
 extern struct fs_context *vfs_dup_fs_context(struct fs_context *fc);
 extern int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param);
-- 
2.39.2