make get_file() return its argument

[pandora-kernel.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index e0bc4ff..b2ccd1e 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -92,6 +92,10 @@ struct inodes_stat_t {
 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
    (specialy hack for floppy.c) */
 #define FMODE_WRITE_IOCTL      ((__force fmode_t)0x100)
+/* 32bit hashes as llseek() offset (for directories) */
+#define FMODE_32BITHASH         ((__force fmode_t)0x200)
+/* 64bit hashes as llseek() offset (for directories) */
+#define FMODE_64BITHASH         ((__force fmode_t)0x400)
 
 /*
  * Don't update ctime and mtime.
@@ -482,6 +486,12 @@ struct iattr {
  */
 #include <linux/quota.h>
 
+/*
+ * Maximum number of layers of fs stack.  Needs to be limited to
+ * prevent kernel stack overflow
+ */
+#define FILESYSTEM_MAX_STACK_DEPTH 2
+
 /** 
  * enum positive_aop_returns - aop return codes with specific semantics
  *
@@ -525,6 +535,7 @@ enum positive_aop_returns {
 struct page;
 struct address_space;
 struct writeback_control;
+enum migrate_mode;
 
 struct iov_iter {
        const struct iovec *iov;
@@ -609,9 +620,12 @@ struct address_space_operations {
                        loff_t offset, unsigned long nr_segs);
        int (*get_xip_mem)(struct address_space *, pgoff_t, int,
                                                void **, unsigned long *);
-       /* migrate the contents of a page to the specified target */
+       /*
+        * migrate the contents of a page to the specified target. If sync
+        * is false, it must not block.
+        */
        int (*migratepage) (struct address_space *,
-                       struct page *, struct page *);
+                       struct page *, struct page *, enum migrate_mode);
        int (*launder_page) (struct page *);
        int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
                                        unsigned long);
@@ -903,9 +917,11 @@ static inline loff_t i_size_read(const struct inode *inode)
 static inline void i_size_write(struct inode *inode, loff_t i_size)
 {
 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
+       preempt_disable();
        write_seqcount_begin(&inode->i_size_seqcount);
        inode->i_size = i_size;
        write_seqcount_end(&inode->i_size_seqcount);
+       preempt_enable();
 #elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
        preempt_disable();
        inode->i_size = i_size;
@@ -1001,6 +1017,7 @@ struct file {
 #ifdef CONFIG_EPOLL
        /* Used by fs/eventpoll.c to link all the hooks to this file */
        struct list_head        f_ep_links;
+       struct list_head        f_tfile_llink;
 #endif /* #ifdef CONFIG_EPOLL */
        struct address_space    *f_mapping;
 #ifdef CONFIG_DEBUG_WRITECOUNT
@@ -1015,7 +1032,11 @@ struct file_handle {
        unsigned char f_handle[0];
 };
 
-#define get_file(x)    atomic_long_inc(&(x)->f_count)
+static inline struct file *get_file(struct file *f)
+{
+       atomic_long_inc(&f->f_count);
+       return f;
+}
 #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
 #define file_count(x)  atomic_long_read(&(x)->f_count)
 
@@ -1202,6 +1223,7 @@ extern int vfs_setlease(struct file *, long, struct file_lock **);
 extern int lease_modify(struct file_lock **, int);
 extern int lock_may_read(struct inode *, loff_t start, unsigned long count);
 extern int lock_may_write(struct inode *, loff_t start, unsigned long count);
+extern void locks_delete_block(struct file_lock *waiter);
 extern void lock_flocks(void);
 extern void unlock_flocks(void);
 #else /* !CONFIG_FILE_LOCKING */
@@ -1346,6 +1368,10 @@ static inline int lock_may_write(struct inode *inode, loff_t start,
        return 1;
 }
 
+static inline void locks_delete_block(struct file_lock *waiter)
+{
+}
+
 static inline void lock_flocks(void)
 {
 }
@@ -1481,6 +1507,11 @@ struct super_block {
        int cleancache_poolid;
 
        struct shrinker s_shrink;       /* per-sb shrinker handle */
+
+       /*
+        * Indicates how deep in a filesystem stack this SB is
+        */
+       int s_stack_depth;
 };
 
 /* superblock cache pruning functions */
@@ -2057,7 +2088,7 @@ extern long do_sys_open(int dfd, const char __user *filename, int flags,
                        int mode);
 extern struct file *filp_open(const char *, int, int);
 extern struct file *file_open_root(struct dentry *, struct vfsmount *,
-                                  const char *, int);
+                                  const char *, int, umode_t);
 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
                                 const struct cred *);
 extern int filp_close(struct file *, fl_owner_t id);
@@ -2088,10 +2119,12 @@ extern void unregister_blkdev(unsigned int, const char *);
 extern struct block_device *bdget(dev_t);
 extern struct block_device *bdgrab(struct block_device *bdev);
 extern void bd_set_size(struct block_device *, loff_t size);
+extern sector_t blkdev_max_block(struct block_device *bdev);
 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 +2132,7 @@ 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)
@@ -2579,12 +2613,13 @@ extern int generic_check_addressable(unsigned, u64);
 
 #ifdef CONFIG_MIGRATION
 extern int buffer_migrate_page(struct address_space *,
-                               struct page *, struct page *);
+                               struct page *, struct page *,
+                               enum migrate_mode);
 #else
 #define buffer_migrate_page NULL
 #endif
 
-extern int inode_change_ok(const struct inode *, struct iattr *);
+extern int setattr_prepare(struct dentry *, struct iattr *);
 extern int inode_newsize_ok(const struct inode *, loff_t offset);
 extern void setattr_copy(struct inode *inode, const struct iattr *attr);