1 files changed, 32 insertions, 75 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index e0bc4ffb8e7f..7aacf31418fe 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1428,6 +1428,7 @@ struct super_block {
 #else
         struct list_head        s_files;
 #endif
+        struct list_head        s_mounts;       /* list of mounts; _not_ for fs use */
         /* s_dentry_lru, s_nr_dentry_unused protected by dcache.c lru locks */
         struct list_head        s_dentry_lru;   /* unused dentry lru */
         int                     s_nr_dentry_unused;     /* # of dentry on lru */
@@ -1440,7 +1441,7 @@ struct super_block {
         struct block_device     *s_bdev;
         struct backing_dev_info *s_bdi;
         struct mtd_info         *s_mtd;
-        struct list_head        s_instances;
+        struct hlist_node       s_instances;
         struct quota_info       s_dquot;        /* Diskquota specific options */
 
         int                     s_frozen;
@@ -1481,6 +1482,12 @@ struct super_block {
         int cleancache_poolid;
 
         struct shrinker s_shrink;       /* per-sb shrinker handle */
+
+        /* Number of inodes with nlink == 0 but still referenced */
+        atomic_long_t s_remove_count;
+
+        /* Being remounted read-only */
+        int s_readonly_remount;
 };
 
 /* superblock cache pruning functions */
@@ -1516,9 +1523,9 @@ extern void unlock_super(struct super_block *);
 /*
  * VFS helper functions..
  */
-extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
-extern int vfs_mkdir(struct inode *, struct dentry *, int);
-extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
+extern int vfs_create(struct inode *, struct dentry *, umode_t, struct nameidata *);
+extern int vfs_mkdir(struct inode *, struct dentry *, umode_t);
+extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
 extern int vfs_symlink(struct inode *, struct dentry *, const char *);
 extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
 extern int vfs_rmdir(struct inode *, struct dentry *);
@@ -1534,7 +1541,7 @@ extern void dentry_unhash(struct dentry *dentry);
  * VFS file helper functions.
  */
 extern void inode_init_owner(struct inode *inode, const struct inode *dir,
-                        mode_t mode);
+                        umode_t mode);
 /*
  * VFS FS_IOC_FIEMAP helper definitions.
  */
@@ -1619,13 +1626,13 @@ struct inode_operations {
         int (*readlink) (struct dentry *, char __user *,int);
         void (*put_link) (struct dentry *, struct nameidata *, void *);
 
-        int (*create) (struct inode *,struct dentry *,int, struct nameidata *);
+        int (*create) (struct inode *,struct dentry *,umode_t,struct nameidata *);
         int (*link) (struct dentry *,struct inode *,struct dentry *);
         int (*unlink) (struct inode *,struct dentry *);
         int (*symlink) (struct inode *,struct dentry *,const char *);
-        int (*mkdir) (struct inode *,struct dentry *,int);
+        int (*mkdir) (struct inode *,struct dentry *,umode_t);
         int (*rmdir) (struct inode *,struct dentry *);
-        int (*mknod) (struct inode *,struct dentry *,int,dev_t);
+        int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t);
         int (*rename) (struct inode *, struct dentry *,
                         struct inode *, struct dentry *);
         void (*truncate) (struct inode *);
@@ -1672,10 +1679,10 @@ struct super_operations {
         int (*remount_fs) (struct super_block *, int *, char *);
         void (*umount_begin) (struct super_block *);
 
-        int (*show_options)(struct seq_file *, struct vfsmount *);
-        int (*show_devname)(struct seq_file *, struct vfsmount *);
-        int (*show_path)(struct seq_file *, struct vfsmount *);
-        int (*show_stats)(struct seq_file *, struct vfsmount *);
+        int (*show_options)(struct seq_file *, struct dentry *);
+        int (*show_devname)(struct seq_file *, struct dentry *);
+        int (*show_path)(struct seq_file *, struct dentry *);
+        int (*show_stats)(struct seq_file *, struct dentry *);
 #ifdef CONFIG_QUOTA
         ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
         ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
@@ -1764,31 +1771,10 @@ static inline void mark_inode_dirty_sync(struct inode *inode)
         __mark_inode_dirty(inode, I_DIRTY_SYNC);
 }
 
-/**
- * set_nlink - directly set an inode's link count
- * @inode: inode
- * @nlink: new nlink (should be non-zero)
- *
- * This is a low-level filesystem helper to replace any
- * direct filesystem manipulation of i_nlink.
- */
-static inline void set_nlink(struct inode *inode, unsigned int nlink)
-{
-        inode->__i_nlink = nlink;
-}
-
-/**
- * inc_nlink - directly increment an inode's link count
- * @inode: inode
- *
- * This is a low-level filesystem helper to replace any
- * direct filesystem manipulation of i_nlink.  Currently,
- * it is only here for parity with dec_nlink().
- */
-static inline void inc_nlink(struct inode *inode)
-{
-        inode->__i_nlink++;
-}
+extern void inc_nlink(struct inode *inode);
+extern void drop_nlink(struct inode *inode);
+extern void clear_nlink(struct inode *inode);
+extern void set_nlink(struct inode *inode, unsigned int nlink);
 
 static inline void inode_inc_link_count(struct inode *inode)
 {
@@ -1796,35 +1782,6 @@ static inline void inode_inc_link_count(struct inode *inode)
         mark_inode_dirty(inode);
 }
 
-/**
- * drop_nlink - directly drop an inode's link count
- * @inode: inode
- *
- * This is a low-level filesystem helper to replace any
- * direct filesystem manipulation of i_nlink.  In cases
- * where we are attempting to track writes to the
- * filesystem, a decrement to zero means an imminent
- * write when the file is truncated and actually unlinked
- * on the filesystem.
- */
-static inline void drop_nlink(struct inode *inode)
-{
-        inode->__i_nlink--;
-}
-
-/**
- * clear_nlink - directly zero an inode's link count
- * @inode: inode
- *
- * This is a low-level filesystem helper to replace any
- * direct filesystem manipulation of i_nlink.  See
- * drop_nlink() for why we care about i_nlink hitting zero.
- */
-static inline void clear_nlink(struct inode *inode)
-{
-        inode->__i_nlink = 0;
-}
-
 static inline void inode_dec_link_count(struct inode *inode)
 {
         drop_nlink(inode);
@@ -1864,7 +1821,7 @@ struct file_system_type {
         void (*kill_sb) (struct super_block *);
         struct module *owner;
         struct file_system_type * next;
-        struct list_head fs_supers;
+        struct hlist_head fs_supers;
 
         struct lock_class_key s_lock_key;
         struct lock_class_key s_umount_key;
@@ -1939,7 +1896,7 @@ extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
 extern int vfs_statfs(struct path *, struct kstatfs *);
 extern int user_statfs(const char __user *, struct kstatfs *);
 extern int fd_statfs(int, struct kstatfs *);
-extern int statfs_by_dentry(struct dentry *, struct kstatfs *);
+extern int vfs_ustat(dev_t, struct kstatfs *);
 extern int freeze_super(struct super_block *super);
 extern int thaw_super(struct super_block *super);
 extern bool our_mnt(struct vfsmount *mnt);
@@ -2054,8 +2011,8 @@ extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
 extern int do_fallocate(struct file *file, int mode, loff_t offset,
                         loff_t len);
 extern long do_sys_open(int dfd, const char __user *filename, int flags,
-                        int mode);
-extern struct file *filp_open(const char *, int, int);
+                        umode_t mode);
+extern struct file *filp_open(const char *, int, umode_t);
 extern struct file *file_open_root(struct dentry *, struct vfsmount *,
                                    const char *, int);
 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
@@ -2092,6 +2049,7 @@ extern void bd_forget(struct inode *inode);
 extern void bdput(struct block_device *);
 extern void invalidate_bdev(struct block_device *);
 extern int sync_blockdev(struct block_device *bdev);
+extern void kill_bdev(struct block_device *);
 extern struct super_block *freeze_bdev(struct block_device *);
 extern void emergency_thaw_all(void);
 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
@@ -2099,6 +2057,7 @@ extern int fsync_bdev(struct block_device *);
 #else
 static inline void bd_forget(struct inode *inode) {}
 static inline int sync_blockdev(struct block_device *bdev) { return 0; }
+static inline void kill_bdev(struct block_device *bdev) {}
 static inline void invalidate_bdev(struct block_device *bdev) {}
 
 static inline struct super_block *freeze_bdev(struct block_device *sb)
@@ -2191,8 +2150,6 @@ extern const struct file_operations read_pipefifo_fops;
 extern const struct file_operations write_pipefifo_fops;
 extern const struct file_operations rdwr_pipefifo_fops;
 
-extern int fs_may_remount_ro(struct super_block *);
-
 #ifdef CONFIG_BLOCK
 /*
  * return READ, READA, or WRITE
@@ -2415,6 +2372,7 @@ extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
                                 unsigned long nr_segs, loff_t pos);
 extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
                         int datasync);
+extern void block_sync_page(struct page *page);
 
 /* fs/splice.c */
 extern ssize_t generic_file_splice_read(struct file *, loff_t *,
@@ -2531,7 +2489,6 @@ extern void put_filesystem(struct file_system_type *fs);
 extern struct file_system_type *get_fs_type(const char *name);
 extern struct super_block *get_super(struct block_device *);
 extern struct super_block *get_active_super(struct block_device *bdev);
-extern struct super_block *user_get_super(dev_t);
 extern void drop_super(struct super_block *sb);
 extern void iterate_supers(void (*)(struct super_block *, void *), void *);
 extern void iterate_supers_type(struct file_system_type *,
@@ -2590,7 +2547,7 @@ extern void setattr_copy(struct inode *inode, const struct iattr *attr);
 
 extern void file_update_time(struct file *file);
 
-extern int generic_show_options(struct seq_file *m, struct vfsmount *mnt);
+extern int generic_show_options(struct seq_file *m, struct dentry *root);
 extern void save_mount_options(struct super_block *sb, char *options);
 extern void replace_mount_options(struct super_block *sb, char *options);
 
@@ -2691,7 +2648,7 @@ int __init get_filesystem_list(char *buf);
 #define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
                                             (flag & __FMODE_NONOTIFY)))
 
-static inline int is_sxid(mode_t mode)
+static inline int is_sxid(umode_t mode)
 {
         return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
 }