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-rw-r--r--mm/shmem.c34
1 files changed, 27 insertions, 7 deletions
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,
};