[PATCH] Save some bytes in struct inode

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

diff --git a/include/linux/fs.h b/include/linux/fs.h
index f53bf4f..70b99fb 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -250,6 +250,8 @@ extern int dir_notify_enable;
 #define FS_NOTAIL_FL                   0x00008000 /* file tail should not be merged */
 #define FS_DIRSYNC_FL                  0x00010000 /* dirsync behaviour (directories only) */
 #define FS_TOPDIR_FL                   0x00020000 /* Top of directory hierarchies*/
+#define FS_EXTENT_FL                   0x00080000 /* Extents */
+#define FS_DIRECTIO_FL                 0x00100000 /* Use direct i/o */
 #define FS_RESERVED_FL                 0x80000000 /* reserved for ext2 lib */
 
 #define FS_FL_USER_VISIBLE             0x0003DFFF /* User visible flags */
@@ -274,7 +276,7 @@ extern int dir_notify_enable;
 #include <linux/radix-tree.h>
 #include <linux/prio_tree.h>
 #include <linux/init.h>
-#include <linux/sched.h>
+#include <linux/pid.h>
 #include <linux/mutex.h>
 
 #include <asm/atomic.h>
@@ -541,19 +543,22 @@ struct inode {
        struct list_head        i_dentry;
        unsigned long           i_ino;
        atomic_t                i_count;
-       umode_t                 i_mode;
        unsigned int            i_nlink;
        uid_t                   i_uid;
        gid_t                   i_gid;
        dev_t                   i_rdev;
+       unsigned long           i_version;
        loff_t                  i_size;
+#ifdef __NEED_I_SIZE_ORDERED
+       seqcount_t              i_size_seqcount;
+#endif
        struct timespec         i_atime;
        struct timespec         i_mtime;
        struct timespec         i_ctime;
        unsigned int            i_blkbits;
-       unsigned long           i_version;
        blkcnt_t                i_blocks;
        unsigned short          i_bytes;
+       umode_t                 i_mode;
        spinlock_t              i_lock; /* i_blocks, i_bytes, maybe i_size */
        struct mutex            i_mutex;
        struct rw_semaphore     i_alloc_sem;
@@ -596,9 +601,6 @@ struct inode {
        void                    *i_security;
 #endif
        void                    *i_private; /* fs or device private pointer */
-#ifdef __NEED_I_SIZE_ORDERED
-       seqcount_t              i_size_seqcount;
-#endif
 };
 
 /*
@@ -621,6 +623,9 @@ enum inode_i_mutex_lock_class
        I_MUTEX_QUOTA
 };
 
+extern void inode_double_lock(struct inode *inode1, struct inode *inode2);
+extern void inode_double_unlock(struct inode *inode1, struct inode *inode2);
+
 /*
  * NOTE: in a 32bit arch with a preemptable kernel and
  * an UP compile the i_size_read/write must be atomic
@@ -631,7 +636,7 @@ enum inode_i_mutex_lock_class
  * cmpxchg8b without the need of the lock prefix). For SMP compiles
  * and 64bit archs it makes no difference if preempt is enabled or not.
  */
-static inline loff_t i_size_read(struct inode *inode)
+static inline loff_t i_size_read(const struct inode *inode)
 {
 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
        loff_t i_size;
@@ -654,7 +659,11 @@ static inline loff_t i_size_read(struct inode *inode)
 #endif
 }
 
-
+/*
+ * NOTE: unlike i_size_read(), i_size_write() does need locking around it
+ * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount
+ * can be lost, resulting in subsequent i_size_read() calls spinning forever.
+ */
 static inline void i_size_write(struct inode *inode, loff_t i_size)
 {
 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
@@ -670,12 +679,12 @@ static inline void i_size_write(struct inode *inode, loff_t i_size)
 #endif
 }
 
-static inline unsigned iminor(struct inode *inode)
+static inline unsigned iminor(const struct inode *inode)
 {
        return MINOR(inode->i_rdev);
 }
 
-static inline unsigned imajor(struct inode *inode)
+static inline unsigned imajor(const struct inode *inode)
 {
        return MAJOR(inode->i_rdev);
 }
@@ -968,36 +977,13 @@ enum {
 #define vfs_check_frozen(sb, level) \
        wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
 
-static inline void get_fs_excl(void)
-{
-       atomic_inc(&current->fs_excl);
-}
-
-static inline void put_fs_excl(void)
-{
-       atomic_dec(&current->fs_excl);
-}
-
-static inline int has_fs_excl(void)
-{
-       return atomic_read(&current->fs_excl);
-}
-
-
-/*
- * Superblock locking.
- */
-static inline void lock_super(struct super_block * sb)
-{
-       get_fs_excl();
-       mutex_lock(&sb->s_lock);
-}
+#define get_fs_excl() atomic_inc(&current->fs_excl)
+#define put_fs_excl() atomic_dec(&current->fs_excl)
+#define has_fs_excl() atomic_read(&current->fs_excl)
 
-static inline void unlock_super(struct super_block * sb)
-{
-       put_fs_excl();
-       mutex_unlock(&sb->s_lock);
-}
+/* not quite ready to be deprecated, but... */
+extern void lock_super(struct super_block *);
+extern void unlock_super(struct super_block *);
 
 /*
  * VFS helper functions..
@@ -1495,7 +1481,9 @@ extern char * getname(const char __user *);
 extern void __init vfs_caches_init_early(void);
 extern void __init vfs_caches_init(unsigned long);
 
-#define __getname()    kmem_cache_alloc(names_cachep, SLAB_KERNEL)
+extern struct kmem_cache *names_cachep;
+
+#define __getname()    kmem_cache_alloc(names_cachep, GFP_KERNEL)
 #define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
 #ifndef CONFIG_AUDITSYSCALL
 #define putname(name)   __putname(name)
@@ -1703,6 +1691,8 @@ extern void __iget(struct inode * inode);
 extern void clear_inode(struct inode *);
 extern void destroy_inode(struct inode *);
 extern struct inode *new_inode(struct super_block *);
+extern int __remove_suid(struct dentry *, int);
+extern int should_remove_suid(struct dentry *);
 extern int remove_suid(struct dentry *);
 extern void remove_dquot_ref(struct super_block *, int, struct list_head *);
 
@@ -1749,6 +1739,8 @@ extern ssize_t generic_file_splice_read(struct file *, loff_t *,
                struct pipe_inode_info *, size_t, unsigned int);
 extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
                struct file *, loff_t *, size_t, unsigned int);
+extern ssize_t generic_file_splice_write_nolock(struct pipe_inode_info *,
+               struct file *, loff_t *, size_t, unsigned int);
 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
                struct file *out, loff_t *, size_t len, unsigned int flags);
 extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,