allow the temp files created by open() to be linked to

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 43db02e..ab11c44 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1506,6 +1506,11 @@ int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
  * to have different dirent layouts depending on the binary type.
  */
 typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
+struct dir_context {
+       const filldir_t actor;
+       loff_t pos;
+};
+
 struct block_device_operations;
 
 /* These macros are for out of kernel modules to test that
@@ -1521,7 +1526,7 @@ struct file_operations {
        ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
        ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
        ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
-       int (*readdir) (struct file *, void *, filldir_t);
+       int (*iterate) (struct file *, struct dir_context *);
        unsigned int (*poll) (struct file *, struct poll_table_struct *);
        long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
        long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
@@ -1575,6 +1580,7 @@ struct inode_operations {
        int (*atomic_open)(struct inode *, struct dentry *,
                           struct file *, unsigned open_flag,
                           umode_t create_mode, int *opened);
+       int (*tmpfile) (struct inode *, struct dentry *, umode_t);
 } ____cacheline_aligned;
 
 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
@@ -1738,6 +1744,7 @@ struct super_operations {
 #define I_REFERENCED           (1 << 8)
 #define __I_DIO_WAKEUP         9
 #define I_DIO_WAKEUP           (1 << I_DIO_WAKEUP)
+#define I_LINKABLE             (1 << 10)
 
 #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)
 
@@ -2414,8 +2421,6 @@ extern ssize_t generic_file_splice_write(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,
-               size_t len, unsigned int flags);
 
 extern void
 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
@@ -2496,6 +2501,7 @@ loff_t inode_get_bytes(struct inode *inode);
 void inode_set_bytes(struct inode *inode, loff_t bytes);
 
 extern int vfs_readdir(struct file *, filldir_t, void *);
+extern int iterate_dir(struct file *, struct dir_context *);
 
 extern int vfs_stat(const char __user *, struct kstat *);
 extern int vfs_lstat(const char __user *, struct kstat *);
@@ -2526,7 +2532,7 @@ extern void iterate_supers_type(struct file_system_type *,
 extern int dcache_dir_open(struct inode *, struct file *);
 extern int dcache_dir_close(struct inode *, struct file *);
 extern loff_t dcache_dir_lseek(struct file *, loff_t, int);
-extern int dcache_readdir(struct file *, void *, filldir_t);
+extern int dcache_readdir(struct file *, struct dir_context *);
 extern int simple_setattr(struct dentry *, struct iattr *);
 extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 extern int simple_statfs(struct dentry *, struct kstatfs *);
@@ -2690,4 +2696,41 @@ static inline void inode_has_no_xattr(struct inode *inode)
                inode->i_flags |= S_NOSEC;
 }
 
+static inline bool dir_emit(struct dir_context *ctx,
+                           const char *name, int namelen,
+                           u64 ino, unsigned type)
+{
+       return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0;
+}
+static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx)
+{
+       return ctx->actor(ctx, ".", 1, ctx->pos,
+                         file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0;
+}
+static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx)
+{
+       return ctx->actor(ctx, "..", 2, ctx->pos,
+                         parent_ino(file->f_path.dentry), DT_DIR) == 0;
+}
+static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx)
+{
+       if (ctx->pos == 0) {
+               if (!dir_emit_dot(file, ctx))
+                       return false;
+               ctx->pos = 1;
+       }
+       if (ctx->pos == 1) {
+               if (!dir_emit_dotdot(file, ctx))
+                       return false;
+               ctx->pos = 2;
+       }
+       return true;
+}
+static inline bool dir_relax(struct inode *inode)
+{
+       mutex_unlock(&inode->i_mutex);
+       mutex_lock(&inode->i_mutex);
+       return !IS_DEADDIR(inode);
+}
+
 #endif /* _LINUX_FS_H */