fs: distinguish between user initiated freeze and kernel initiated freeze

[platform/kernel/linux-starfive.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6867512..5e8d812 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1147,7 +1147,8 @@ enum {
 #define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1)
 
 struct sb_writers {
-       int                             frozen;         /* Is sb frozen? */
+       unsigned short                  frozen;         /* Is sb frozen? */
+       unsigned short                  freeze_holders; /* Who froze fs? */
        struct percpu_rw_semaphore      rw_sem[SB_FREEZE_LEVELS];
 };
 
@@ -1902,6 +1903,10 @@ extern loff_t vfs_dedupe_file_range_one(struct file *src_file, loff_t src_pos,
                                        struct file *dst_file, loff_t dst_pos,
                                        loff_t len, unsigned int remap_flags);
 
+enum freeze_holder {
+       FREEZE_HOLDER_KERNEL    = (1U << 0),
+       FREEZE_HOLDER_USERSPACE = (1U << 1),
+};
 
 struct super_operations {
        struct inode *(*alloc_inode)(struct super_block *sb);
@@ -1914,9 +1919,9 @@ struct super_operations {
        void (*evict_inode) (struct inode *);
        void (*put_super) (struct super_block *);
        int (*sync_fs)(struct super_block *sb, int wait);
-       int (*freeze_super) (struct super_block *);
+       int (*freeze_super) (struct super_block *, enum freeze_holder who);
        int (*freeze_fs) (struct super_block *);
-       int (*thaw_super) (struct super_block *);
+       int (*thaw_super) (struct super_block *, enum freeze_holder who);
        int (*unfreeze_fs) (struct super_block *);
        int (*statfs) (struct dentry *, struct kstatfs *);
        int (*remount_fs) (struct super_block *, int *, char *);
@@ -2290,8 +2295,8 @@ extern int unregister_filesystem(struct file_system_type *);
 extern int vfs_statfs(const struct path *, struct kstatfs *);
 extern int user_statfs(const char __user *, struct kstatfs *);
 extern int fd_statfs(int, struct kstatfs *);
-extern int freeze_super(struct super_block *super);
-extern int thaw_super(struct super_block *super);
+int freeze_super(struct super_block *super, enum freeze_holder who);
+int thaw_super(struct super_block *super, enum freeze_holder who);
 extern __printf(2, 3)
 int super_setup_bdi_name(struct super_block *sb, char *fmt, ...);
 extern int super_setup_bdi(struct super_block *sb);