implement simple fs aops

Implement new aops for some of the simpler filesystems.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

6 files changed, 45 insertions, 21 deletions

diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index ddc003a9d214..dbd257d956c4 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -41,8 +41,8 @@ extern struct super_block * configfs_sb;
 
 static const struct address_space_operations configfs_aops = {
         .readpage       = simple_readpage,
-        .prepare_write  = simple_prepare_write,
-        .commit_write   = simple_commit_write
+        .write_begin    = simple_write_begin,
+        .write_end      = simple_write_end,
 };
 
 static struct backing_dev_info configfs_backing_dev_info = {
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 950c2fbb815b..70fbb29fb202 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -189,15 +189,19 @@ static int hugetlbfs_readpage(struct file *file, struct page * page)
         return -EINVAL;
 }
 
-static int hugetlbfs_prepare_write(struct file *file,
-                        struct page *page, unsigned offset, unsigned to)
+static int hugetlbfs_write_begin(struct file *file,
+                        struct address_space *mapping,
+                        loff_t pos, unsigned len, unsigned flags,
+                        struct page **pagep, void **fsdata)
 {
         return -EINVAL;
 }
 
-static int hugetlbfs_commit_write(struct file *file,
-                        struct page *page, unsigned offset, unsigned to)
+static int hugetlbfs_write_end(struct file *file, struct address_space *mapping,
+                        loff_t pos, unsigned len, unsigned copied,
+                        struct page *page, void *fsdata)
 {
+        BUG();
         return -EINVAL;
 }
 
@@ -569,8 +573,8 @@ static void hugetlbfs_destroy_inode(struct inode *inode)
 
 static const struct address_space_operations hugetlbfs_aops = {
         .readpage       = hugetlbfs_readpage,
-        .prepare_write  = hugetlbfs_prepare_write,
-        .commit_write   = hugetlbfs_commit_write,
+        .write_begin    = hugetlbfs_write_begin,
+        .write_end      = hugetlbfs_write_end,
         .set_page_dirty = hugetlbfs_set_page_dirty,
 };
 
diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
index 97bdc0b2f9d2..b41a514b0976 100644
--- a/fs/ramfs/file-mmu.c
+++ b/fs/ramfs/file-mmu.c
@@ -29,8 +29,8 @@
 
 const struct address_space_operations ramfs_aops = {
         .readpage       = simple_readpage,
-        .prepare_write  = simple_prepare_write,
-        .commit_write   = simple_commit_write,
+        .write_begin    = simple_write_begin,
+        .write_end      = simple_write_end,
         .set_page_dirty = __set_page_dirty_no_writeback,
 };
 
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 237fe8b8e819..0989bc2c2f69 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -29,8 +29,8 @@ static int ramfs_nommu_setattr(struct dentry *, struct iattr *);
 
 const struct address_space_operations ramfs_aops = {
         .readpage               = simple_readpage,
-        .prepare_write          = simple_prepare_write,
-        .commit_write           = simple_commit_write,
+        .write_begin            = simple_write_begin,
+        .write_end              = simple_write_end,
         .set_page_dirty         = __set_page_dirty_no_writeback,
 };
 
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 9236635111f4..c4ef945d39c8 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -24,8 +24,8 @@ extern struct super_block * sysfs_sb;
 
 static const struct address_space_operations sysfs_aops = {
         .readpage       = simple_readpage,
-        .prepare_write  = simple_prepare_write,
-        .commit_write   = simple_commit_write
+        .write_begin    = simple_write_begin,
+        .write_end      = simple_write_end,
 };
 
 static struct backing_dev_info sysfs_backing_dev_info = {
diff --git a/mm/shmem.c b/mm/shmem.c
index 2c39925fe073..131f2938f3ad 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1108,7 +1108,7 @@ static int shmem_getpage(struct inode *inode, unsigned long idx,
          * Normally, filepage is NULL on entry, and either found
          * uptodate immediately, or allocated and zeroed, or read
          * in under swappage, which is then assigned to filepage.
-         * But shmem_readpage and shmem_prepare_write pass in a locked
+         * But shmem_readpage and shmem_write_begin pass in a locked
          * filepage, which may be found not uptodate by other callers
          * too, and may need to be copied from the swappage read in.
          */
@@ -1445,7 +1445,7 @@ static const struct inode_operations shmem_symlink_inode_operations;
 static const struct inode_operations shmem_symlink_inline_operations;
 
 /*
- * Normally tmpfs avoids the use of shmem_readpage and shmem_prepare_write;
+ * Normally tmpfs avoids the use of shmem_readpage and shmem_write_begin;
  * but providing them allows a tmpfs file to be used for splice, sendfile, and
  * below the loop driver, in the generic fashion that many filesystems support.
  */
@@ -1458,10 +1458,30 @@ static int shmem_readpage(struct file *file, struct page *page)
 }
 
 static int
-shmem_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
+shmem_write_begin(struct file *file, struct address_space *mapping,
+                        loff_t pos, unsigned len, unsigned flags,
+                        struct page **pagep, void **fsdata)
 {
-        struct inode *inode = page->mapping->host;
-        return shmem_getpage(inode, page->index, &page, SGP_WRITE, NULL);
+        struct inode *inode = mapping->host;
+        pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+        *pagep = NULL;
+        return shmem_getpage(inode, index, pagep, SGP_WRITE, NULL);
+}
+
+static int
+shmem_write_end(struct file *file, struct address_space *mapping,
+                        loff_t pos, unsigned len, unsigned copied,
+                        struct page *page, void *fsdata)
+{
+        struct inode *inode = mapping->host;
+
+        set_page_dirty(page);
+        page_cache_release(page);
+
+        if (pos+copied > inode->i_size)
+                i_size_write(inode, pos+copied);
+
+        return copied;
 }
 
 static ssize_t
@@ -2337,8 +2357,8 @@ static const struct address_space_operations shmem_aops = {
         .set_page_dirty = __set_page_dirty_no_writeback,
 #ifdef CONFIG_TMPFS
         .readpage       = shmem_readpage,
-        .prepare_write  = shmem_prepare_write,
-        .commit_write   = simple_commit_write,
+        .write_begin    = shmem_write_begin,
+        .write_end      = shmem_write_end,
 #endif
         .migratepage    = migrate_page,
 };