[PATCH] f_count may wrap around

[linux-2.6-omap-h63xx.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9c2ac5c0ef5cb3db65050866694d4cf8af2c8dc3..7676fa1c20ae270ee23dc53eb58171de02432beb 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -60,6 +60,8 @@ extern int dir_notify_enable;
 #define MAY_WRITE 2
 #define MAY_READ 4
 #define MAY_APPEND 8
+#define MAY_ACCESS 16
+#define MAY_OPEN 32
 
 #define FMODE_READ 1
 #define FMODE_WRITE 2
@@ -318,22 +320,23 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
  * Attribute flags.  These should be or-ed together to figure out what
  * has been changed!
  */
-#define ATTR_MODE      1
-#define ATTR_UID       2
-#define ATTR_GID       4
-#define ATTR_SIZE      8
-#define ATTR_ATIME     16
-#define ATTR_MTIME     32
-#define ATTR_CTIME     64
-#define ATTR_ATIME_SET 128
-#define ATTR_MTIME_SET 256
-#define ATTR_FORCE     512     /* Not a change, but a change it */
-#define ATTR_ATTR_FLAG 1024
-#define ATTR_KILL_SUID 2048
-#define ATTR_KILL_SGID 4096
-#define ATTR_FILE      8192
-#define ATTR_KILL_PRIV 16384
-#define ATTR_OPEN      32768   /* Truncating from open(O_TRUNC) */
+#define ATTR_MODE      (1 << 0)
+#define ATTR_UID       (1 << 1)
+#define ATTR_GID       (1 << 2)
+#define ATTR_SIZE      (1 << 3)
+#define ATTR_ATIME     (1 << 4)
+#define ATTR_MTIME     (1 << 5)
+#define ATTR_CTIME     (1 << 6)
+#define ATTR_ATIME_SET (1 << 7)
+#define ATTR_MTIME_SET (1 << 8)
+#define ATTR_FORCE     (1 << 9) /* Not a change, but a change it */
+#define ATTR_ATTR_FLAG (1 << 10)
+#define ATTR_KILL_SUID (1 << 11)
+#define ATTR_KILL_SGID (1 << 12)
+#define ATTR_FILE      (1 << 13)
+#define ATTR_KILL_PRIV (1 << 14)
+#define ATTR_OPEN      (1 << 15) /* Truncating from open(O_TRUNC) */
+#define ATTR_TIMES_SET (1 << 16)
 
 /*
  * This is the Inode Attributes structure, used for notify_change().  It
@@ -499,7 +502,7 @@ struct backing_dev_info;
 struct address_space {
        struct inode            *host;          /* owner: inode, block_device */
        struct radix_tree_root  page_tree;      /* radix tree of all pages */
-       rwlock_t                tree_lock;      /* and rwlock protecting it */
+       spinlock_t              tree_lock;      /* and lock protecting it */
        unsigned int            i_mmap_writable;/* count VM_SHARED mappings */
        struct prio_tree_root   i_mmap;         /* tree of private and shared mappings */
        struct list_head        i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
@@ -792,7 +795,7 @@ struct file {
 #define f_dentry       f_path.dentry
 #define f_vfsmnt       f_path.mnt
        const struct file_operations    *f_op;
-       atomic_t                f_count;
+       atomic_long_t           f_count;
        unsigned int            f_flags;
        mode_t                  f_mode;
        loff_t                  f_pos;
@@ -821,8 +824,8 @@ extern spinlock_t files_lock;
 #define file_list_lock() spin_lock(&files_lock);
 #define file_list_unlock() spin_unlock(&files_lock);
 
-#define get_file(x)    atomic_inc(&(x)->f_count)
-#define file_count(x)  atomic_read(&(x)->f_count)
+#define get_file(x)    atomic_long_inc(&(x)->f_count)
+#define file_count(x)  atomic_long_read(&(x)->f_count)
 
 #ifdef CONFIG_DEBUG_WRITECOUNT
 static inline void file_take_write(struct file *f)
@@ -885,6 +888,12 @@ static inline int file_check_writeable(struct file *filp)
 #define FL_CLOSE       64      /* unlock on close */
 #define FL_SLEEP       128     /* A blocking lock */
 
+/*
+ * Special return value from posix_lock_file() and vfs_lock_file() for
+ * asynchronous locking.
+ */
+#define FILE_LOCK_DEFERRED 1
+
 /*
  * The POSIX file lock owner is determined by
  * the "struct files_struct" in the thread group
@@ -1025,6 +1034,7 @@ extern int send_sigurg(struct fown_struct *fown);
 extern struct list_head super_blocks;
 extern spinlock_t sb_lock;
 
+#define sb_entry(list)  list_entry((list), struct super_block, s_list)
 #define S_BIAS (1<<30)
 struct super_block {
        struct list_head        s_list;         /* Keep this first */
@@ -1058,6 +1068,9 @@ struct super_block {
        struct list_head        s_more_io;      /* parked for more writeback */
        struct hlist_head       s_anon;         /* anonymous dentries for (nfs) exporting */
        struct list_head        s_files;
+       /* s_dentry_lru and s_nr_dentry_unused are protected by dcache_lock */
+       struct list_head        s_dentry_lru;   /* unused dentry lru */
+       int                     s_nr_dentry_unused;     /* # of dentry on lru */
 
        struct block_device     *s_bdev;
        struct mtd_info         *s_mtd;
@@ -1126,7 +1139,7 @@ extern int vfs_permission(struct nameidata *, int);
 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_symlink(struct inode *, struct dentry *, const char *, int);
+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 *);
 extern int vfs_unlink(struct inode *, struct dentry *);
@@ -1262,7 +1275,7 @@ struct inode_operations {
        void * (*follow_link) (struct dentry *, struct nameidata *);
        void (*put_link) (struct dentry *, struct nameidata *, void *);
        void (*truncate) (struct inode *);
-       int (*permission) (struct inode *, int, struct nameidata *);
+       int (*permission) (struct inode *, int);
        int (*setattr) (struct dentry *, struct iattr *);
        int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *);
        int (*setxattr) (struct dentry *, const char *,const void *,size_t,int);
@@ -1686,9 +1699,9 @@ extern void init_special_inode(struct inode *, umode_t, dev_t);
 extern void make_bad_inode(struct inode *);
 extern int is_bad_inode(struct inode *);
 
-extern const struct file_operations read_fifo_fops;
-extern const struct file_operations write_fifo_fops;
-extern const struct file_operations rdwr_fifo_fops;
+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 *);
 
@@ -1757,7 +1770,7 @@ extern int do_remount_sb(struct super_block *sb, int flags,
 extern sector_t bmap(struct inode *, sector_t);
 #endif
 extern int notify_change(struct dentry *, struct iattr *);
-extern int permission(struct inode *, int, struct nameidata *);
+extern int inode_permission(struct inode *, int);
 extern int generic_permission(struct inode *, int,
                int (*check_acl)(struct inode *, int));
 
@@ -1773,8 +1786,9 @@ static inline void allow_write_access(struct file *file)
                atomic_inc(&file->f_path.dentry->d_inode->i_writecount);
 }
 extern int do_pipe(int *);
-extern struct file *create_read_pipe(struct file *f);
-extern struct file *create_write_pipe(void);
+extern int do_pipe_flags(int *, int);
+extern struct file *create_read_pipe(struct file *f, int flags);
+extern struct file *create_write_pipe(int flags);
 extern void free_write_pipe(struct file *);
 
 extern struct file *do_filp_open(int dfd, const char *pathname,
@@ -1820,7 +1834,7 @@ extern void clear_inode(struct inode *);
 extern void destroy_inode(struct inode *);
 extern struct inode *new_inode(struct super_block *);
 extern int should_remove_suid(struct dentry *);
-extern int remove_suid(struct dentry *);
+extern int file_remove_suid(struct file *);
 
 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
 extern void remove_inode_hash(struct inode *);
@@ -2006,8 +2020,6 @@ extern void simple_release_fs(struct vfsmount **mount, int *count);
 
 extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
                        loff_t *ppos, const void *from, size_t available);
-extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
-                       const void *from, size_t available);
 
 #ifdef CONFIG_MIGRATION
 extern int buffer_migrate_page(struct address_space *,