1 files changed, 55 insertions, 25 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index ba98668a1826..0c4df261af7e 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -58,14 +58,15 @@ struct inodes_stat_t {
 
 #define NR_FILE  8192   /* this can well be larger on a larger system */
 
-#define MAY_EXEC 1
-#define MAY_WRITE 2
-#define MAY_READ 4
-#define MAY_APPEND 8
-#define MAY_ACCESS 16
-#define MAY_OPEN 32
-#define MAY_CHDIR 64
-#define MAY_NOT_BLOCK 128       /* called from RCU mode, don't block */
+#define MAY_EXEC                0x00000001
+#define MAY_WRITE               0x00000002
+#define MAY_READ                0x00000004
+#define MAY_APPEND              0x00000008
+#define MAY_ACCESS              0x00000010
+#define MAY_OPEN                0x00000020
+#define MAY_CHDIR               0x00000040
+/* called from RCU mode, don't block */
+#define MAY_NOT_BLOCK           0x00000080
 
 /*
  * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond
@@ -767,14 +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;
@@ -782,7 +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 */
@@ -796,9 +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;
@@ -822,7 +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 */
 };
 
@@ -963,7 +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
@@ -1627,9 +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 *);
@@ -1748,6 +1765,19 @@ static inline void mark_inode_dirty_sync(struct inode *inode)
 }
 
 /**
+ * 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
  *
@@ -1757,7 +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)
@@ -1779,7 +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--;
 }
 
 /**
@@ -1792,7 +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)
@@ -2401,8 +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);
 
@@ -2628,8 +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; */
 }