1 files changed, 93 insertions, 13 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 16421f662a7a..f70d52c46617 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -381,7 +381,7 @@ struct iattr {
  *                      trying again.  The aop will be taking reasonable
  *                      precautions not to livelock.  If the caller held a page
  *                      reference, it should drop it before retrying.  Returned
- *                      by readpage(), prepare_write(), and commit_write().
+ *                      by readpage().
  *
  * address_space_operation functions return these large constants to indicate
  * special semantics to the caller.  These are much larger than the bytes in a
@@ -394,6 +394,9 @@ enum positive_aop_returns {
         AOP_TRUNCATED_PAGE      = 0x80001,
 };
 
+#define AOP_FLAG_UNINTERRUPTIBLE        0x0001 /* will not do a short write */
+#define AOP_FLAG_CONT_EXPAND            0x0002 /* called from cont_expand */
+
 /*
  * oh the beauties of C type declarations.
  */
@@ -401,6 +404,39 @@ struct page;
 struct address_space;
 struct writeback_control;
 
+struct iov_iter {
+        const struct iovec *iov;
+        unsigned long nr_segs;
+        size_t iov_offset;
+        size_t count;
+};
+
+size_t iov_iter_copy_from_user_atomic(struct page *page,
+                struct iov_iter *i, unsigned long offset, size_t bytes);
+size_t iov_iter_copy_from_user(struct page *page,
+                struct iov_iter *i, unsigned long offset, size_t bytes);
+void iov_iter_advance(struct iov_iter *i, size_t bytes);
+int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
+size_t iov_iter_single_seg_count(struct iov_iter *i);
+
+static inline void iov_iter_init(struct iov_iter *i,
+                        const struct iovec *iov, unsigned long nr_segs,
+                        size_t count, size_t written)
+{
+        i->iov = iov;
+        i->nr_segs = nr_segs;
+        i->iov_offset = 0;
+        i->count = count + written;
+
+        iov_iter_advance(i, written);
+}
+
+static inline size_t iov_iter_count(struct iov_iter *i)
+{
+        return i->count;
+}
+
+
 struct address_space_operations {
         int (*writepage)(struct page *page, struct writeback_control *wbc);
         int (*readpage)(struct file *, struct page *);
@@ -421,6 +457,14 @@ struct address_space_operations {
          */
         int (*prepare_write)(struct file *, struct page *, unsigned, unsigned);
         int (*commit_write)(struct file *, struct page *, unsigned, unsigned);
+
+        int (*write_begin)(struct file *, struct address_space *mapping,
+                                loff_t pos, unsigned len, unsigned flags,
+                                struct page **pagep, void **fsdata);
+        int (*write_end)(struct file *, struct address_space *mapping,
+                                loff_t pos, unsigned len, unsigned copied,
+                                struct page *page, void *fsdata);
+
         /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
         sector_t (*bmap)(struct address_space *, sector_t);
         void (*invalidatepage) (struct page *, unsigned long);
@@ -435,6 +479,18 @@ struct address_space_operations {
         int (*launder_page) (struct page *);
 };
 
+/*
+ * pagecache_write_begin/pagecache_write_end must be used by general code
+ * to write into the pagecache.
+ */
+int pagecache_write_begin(struct file *, struct address_space *mapping,
+                                loff_t pos, unsigned len, unsigned flags,
+                                struct page **pagep, void **fsdata);
+
+int pagecache_write_end(struct file *, struct address_space *mapping,
+                                loff_t pos, unsigned len, unsigned copied,
+                                struct page *page, void *fsdata);
+
 struct backing_dev_info;
 struct address_space {
         struct inode            *host;          /* owner: inode, block_device */
@@ -697,16 +753,14 @@ struct fown_struct {
  * Track a single file's readahead state
  */
 struct file_ra_state {
-        pgoff_t start;                  /* where readahead started */
-        unsigned long size;             /* # of readahead pages */
-        unsigned long async_size;       /* do asynchronous readahead when
+        pgoff_t start;                  /* where readahead started */
+        unsigned int size;              /* # of readahead pages */
+        unsigned int async_size;        /* do asynchronous readahead when
                                            there are only # of pages ahead */
 
-        unsigned long ra_pages;         /* Maximum readahead window */
-        unsigned long mmap_hit;         /* Cache hit stat for mmap accesses */
-        unsigned long mmap_miss;        /* Cache miss stat for mmap accesses */
-        unsigned long prev_index;       /* Cache last read() position */
-        unsigned int prev_offset;       /* Offset where last read() ended in a page */
+        unsigned int ra_pages;          /* Maximum readahead window */
+        int mmap_miss;                  /* Cache miss stat for mmap accesses */
+        loff_t prev_pos;                /* Cache last read() position */
 };
 
 /*
@@ -883,6 +937,7 @@ 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 struct seq_operations locks_seq_operations;
 
 struct fasync_struct {
         int     magic;
@@ -1302,8 +1357,14 @@ struct file_system_type {
         struct module *owner;
         struct file_system_type * next;
         struct list_head fs_supers;
+
         struct lock_class_key s_lock_key;
         struct lock_class_key s_umount_key;
+
+        struct lock_class_key i_lock_key;
+        struct lock_class_key i_mutex_key;
+        struct lock_class_key i_mutex_dir_key;
+        struct lock_class_key i_alloc_sem_key;
 };
 
 extern int get_sb_bdev(struct file_system_type *fs_type,
@@ -1369,12 +1430,25 @@ extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size
  * Candidates for mandatory locking have the setgid bit set
  * but no group execute bit -  an otherwise meaningless combination.
  */
-#define MANDATORY_LOCK(inode) \
-        (IS_MANDLOCK(inode) && ((inode)->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
+
+static inline int __mandatory_lock(struct inode *ino)
+{
+        return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID;
+}
+
+/*
+ * ... and these candidates should be on MS_MANDLOCK mounted fs,
+ * otherwise these will be advisory locks
+ */
+
+static inline int mandatory_lock(struct inode *ino)
+{
+        return IS_MANDLOCK(ino) && __mandatory_lock(ino);
+}
 
 static inline int locks_verify_locked(struct inode *inode)
 {
-        if (MANDATORY_LOCK(inode))
+        if (mandatory_lock(inode))
                 return locks_mandatory_locked(inode);
         return 0;
 }
@@ -1385,7 +1459,7 @@ static inline int locks_verify_truncate(struct inode *inode,
                                     struct file *filp,
                                     loff_t size)
 {
-        if (inode->i_flock && MANDATORY_LOCK(inode))
+        if (inode->i_flock && mandatory_lock(inode))
                 return locks_mandatory_area(
                         FLOCK_VERIFY_WRITE, inode, filp,
                         size < inode->i_size ? size : inode->i_size,
@@ -1815,6 +1889,12 @@ extern int simple_prepare_write(struct file *file, struct page *page,
                         unsigned offset, unsigned to);
 extern int simple_commit_write(struct file *file, struct page *page,
                                 unsigned offset, unsigned to);
+extern int simple_write_begin(struct file *file, struct address_space *mapping,
+                        loff_t pos, unsigned len, unsigned flags,
+                        struct page **pagep, void **fsdata);
+extern int simple_write_end(struct file *file, struct address_space *mapping,
+                        loff_t pos, unsigned len, unsigned copied,
+                        struct page *page, void *fsdata);
 
 extern struct dentry *simple_lookup(struct inode *, struct dentry *, struct nameidata *);
 extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *);