Merge git://github.com/rustyrussell/linux

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

diff --git a/include/linux/fs.h b/include/linux/fs.h
index c1884e9..0c4df26 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -768,14 +768,25 @@ struct inode {
 
        /* Stat data, not accessed from path walking */
        unsigned long           i_ino;
-       unsigned int            i_nlink;
+       /*
+        * Filesystems may only read i_nlink directly.  They shall use the
+        * following functions for modification:
+        *
+        *    (set|clear|inc|drop)_nlink
+        *    inode_(inc|dec)_link_count
+        */
+       union {
+               const unsigned int i_nlink;
+               unsigned int __i_nlink;
+       };
        dev_t                   i_rdev;
-       loff_t                  i_size;
        struct timespec         i_atime;
        struct timespec         i_mtime;
        struct timespec         i_ctime;
-       unsigned int            i_blkbits;
+       spinlock_t              i_lock; /* i_blocks, i_bytes, maybe i_size */
+       unsigned short          i_bytes;
        blkcnt_t                i_blocks;
+       loff_t                  i_size;
 
 #ifdef __NEED_I_SIZE_ORDERED
        seqcount_t              i_size_seqcount;
@@ -783,7 +794,6 @@ struct inode {
 
        /* Misc */
        unsigned long           i_state;
-       spinlock_t              i_lock; /* i_blocks, i_bytes, maybe i_size */
        struct mutex            i_mutex;
 
        unsigned long           dirtied_when;   /* jiffies of first dirtying */
@@ -797,9 +807,10 @@ struct inode {
                struct rcu_head         i_rcu;
        };
        atomic_t                i_count;
+       unsigned int            i_blkbits;
        u64                     i_version;
-       unsigned short          i_bytes;
        atomic_t                i_dio_count;
+       atomic_t                i_writecount;
        const struct file_operations    *i_fop; /* former ->i_op->default_file_ops */
        struct file_lock        *i_flock;
        struct address_space    i_data;
@@ -823,7 +834,6 @@ struct inode {
 #ifdef CONFIG_IMA
        atomic_t                i_readcount; /* struct files open RO */
 #endif
-       atomic_t                i_writecount;
        void                    *i_private; /* fs or device private pointer */
 };
 
@@ -964,7 +974,12 @@ struct file {
 #define f_dentry       f_path.dentry
 #define f_vfsmnt       f_path.mnt
        const struct file_operations    *f_op;
-       spinlock_t              f_lock;  /* f_ep_links, f_flags, no IRQ */
+
+       /*
+        * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.
+        * Must not be taken from IRQ context.
+        */
+       spinlock_t              f_lock;
 #ifdef CONFIG_SMP
        int                     f_sb_list_cpu;
 #endif
@@ -1064,6 +1079,8 @@ static inline int file_check_writeable(struct file *filp)
 #define FL_LEASE       32      /* lease held on this file */
 #define FL_CLOSE       64      /* unlock on close */
 #define FL_SLEEP       128     /* A blocking lock */
+#define FL_DOWNGRADE_PENDING   256 /* Lease is being downgraded */
+#define FL_UNLOCK_PENDING      512 /* Lease is being broken */
 
 /*
  * Special return value from posix_lock_file() and vfs_lock_file() for
@@ -1110,7 +1127,7 @@ struct file_lock {
        struct list_head fl_link;       /* doubly linked list of all locks */
        struct list_head fl_block;      /* circular list of blocked processes */
        fl_owner_t fl_owner;
-       unsigned char fl_flags;
+       unsigned int fl_flags;
        unsigned char fl_type;
        unsigned int fl_pid;
        struct pid *fl_nspid;
@@ -1120,7 +1137,9 @@ struct file_lock {
        loff_t fl_end;
 
        struct fasync_struct *  fl_fasync; /* for lease break notifications */
-       unsigned long fl_break_time;    /* for nonblocking lease breaks */
+       /* for lease breaks: */
+       unsigned long fl_break_time;
+       unsigned long fl_downgrade_time;
 
        const struct file_lock_operations *fl_ops;      /* Callbacks for filesystems */
        const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */
@@ -1624,9 +1643,10 @@ struct inode_operations {
 struct seq_file;
 
 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
-                               unsigned long nr_segs, unsigned long fast_segs,
-                               struct iovec *fast_pointer,
-                               struct iovec **ret_pointer);
+                             unsigned long nr_segs, unsigned long fast_segs,
+                             struct iovec *fast_pointer,
+                             struct iovec **ret_pointer,
+                             int check_access);
 
 extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
 extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
@@ -1744,6 +1764,19 @@ 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
@@ -1754,7 +1787,7 @@ static inline void mark_inode_dirty_sync(struct inode *inode)
  */
 static inline void inc_nlink(struct inode *inode)
 {
-       inode->i_nlink++;
+       inode->__i_nlink++;
 }
 
 static inline void inode_inc_link_count(struct inode *inode)
@@ -1776,7 +1809,7 @@ static inline void inode_inc_link_count(struct inode *inode)
  */
 static inline void drop_nlink(struct inode *inode)
 {
-       inode->i_nlink--;
+       inode->__i_nlink--;
 }
 
 /**
@@ -1789,7 +1822,7 @@ static inline void drop_nlink(struct inode *inode)
  */
 static inline void clear_nlink(struct inode *inode)
 {
-       inode->i_nlink = 0;
+       inode->__i_nlink = 0;
 }
 
 static inline void inode_dec_link_count(struct inode *inode)
@@ -2398,8 +2431,8 @@ file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
 extern loff_t noop_llseek(struct file *file, loff_t offset, int origin);
 extern loff_t no_llseek(struct file *file, loff_t offset, int origin);
 extern loff_t generic_file_llseek(struct file *file, loff_t offset, int origin);
-extern loff_t generic_file_llseek_unlocked(struct file *file, loff_t offset,
-                       int origin);
+extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
+               int origin, loff_t maxsize);
 extern int generic_file_open(struct inode * inode, struct file * filp);
 extern int nonseekable_open(struct inode * inode, struct file * filp);
 
@@ -2625,8 +2658,8 @@ static const struct file_operations __fops = {                            \
        .llseek  = generic_file_llseek,                                 \
 };
 
-static inline void __attribute__((format(printf, 1, 2)))
-__simple_attr_check_format(const char *fmt, ...)
+static inline __printf(1, 2)
+void __simple_attr_check_format(const char *fmt, ...)
 {
        /* don't do anything, just let the compiler check the arguments; */
 }