prepare/commit_write no longer returns AOP_TRUNCATED_PAGE since OCFS2 and GFS2
were converted to the new aops, so we can make some simplifications for that.
Cc: Linux Filesystems <linux-fsdevel@xxxxxxxxxxxxxxx>
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Documentation/filesystems/vfs.txt | 6 -----
fs/ecryptfs/mmap.c | 39 +++++++++-----------------------------
include/linux/fs.h | 2 -
mm/filemap.c | 21 +++++++-------------
4 files changed, 20 insertions(+), 48 deletions(-)
Index: linux-2.6/Documentation/filesystems/vfs.txt
===================================================================
--- linux-2.6.orig/Documentation/filesystems/vfs.txt
+++ linux-2.6/Documentation/filesystems/vfs.txt
@@ -619,11 +619,7 @@ struct address_space_operations {
any basic-blocks on storage, then those blocks should be
pre-read (if they haven't been read already) so that the
updated blocks can be written out properly.
- The page will be locked. If prepare_write wants to unlock the
- page it, like readpage, may do so and return
- AOP_TRUNCATED_PAGE.
- In this case the prepare_write will be retried one the lock is
- regained.
+ The page will be locked.
Note: the page _must not_ be marked uptodate in this function
(or anywhere else) unless it actually is uptodate right now. As
Index: linux-2.6/fs/ecryptfs/mmap.c
===================================================================
--- linux-2.6.orig/fs/ecryptfs/mmap.c
+++ linux-2.6/fs/ecryptfs/mmap.c
@@ -412,11 +412,9 @@ out:
return rc;
}
-static
-void ecryptfs_release_lower_page(struct page *lower_page, int page_locked)
+static void ecryptfs_release_lower_page(struct page *lower_page)
{
- if (page_locked)
- unlock_page(lower_page);
+ unlock_page(lower_page);
page_cache_release(lower_page);
}
@@ -437,7 +435,6 @@ static int ecryptfs_write_inode_size_to_
const struct address_space_operations *lower_a_ops;
u64 file_size;
-retry:
header_page = grab_cache_page(lower_inode->i_mapping, 0);
if (!header_page) {
ecryptfs_printk(KERN_ERR, "grab_cache_page for "
@@ -448,11 +445,7 @@ retry:
lower_a_ops = lower_inode->i_mapping->a_ops;
rc = lower_a_ops->prepare_write(lower_file, header_page, 0, 8);
if (rc) {
- if (rc == AOP_TRUNCATED_PAGE) {
- ecryptfs_release_lower_page(header_page, 0);
- goto retry;
- } else
- ecryptfs_release_lower_page(header_page, 1);
+ ecryptfs_release_lower_page(header_page);
goto out;
}
file_size = (u64)i_size_read(inode);
@@ -466,11 +459,7 @@ retry:
if (rc < 0)
ecryptfs_printk(KERN_ERR, "Error commiting header page "
"write\n");
- if (rc == AOP_TRUNCATED_PAGE) {
- ecryptfs_release_lower_page(header_page, 0);
- goto retry;
- } else
- ecryptfs_release_lower_page(header_page, 1);
+ ecryptfs_release_lower_page(header_page);
lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty_sync(inode);
out:
@@ -573,16 +562,11 @@ retry:
byte_offset,
region_bytes);
if (rc) {
- if (rc == AOP_TRUNCATED_PAGE) {
- ecryptfs_release_lower_page(*lower_page, 0);
- goto retry;
- } else {
- ecryptfs_printk(KERN_ERR, "prepare_write for "
- "lower_page_index = [0x%.16x] failed; rc = "
- "[%d]\n", lower_page_index, rc);
- ecryptfs_release_lower_page(*lower_page, 1);
- (*lower_page) = NULL;
- }
+ ecryptfs_printk(KERN_ERR, "prepare_write for "
+ "lower_page_index = [0x%.16x] failed; rc = "
+ "[%d]\n", lower_page_index, rc);
+ ecryptfs_release_lower_page(*lower_page);
+ (*lower_page) = NULL;
}
out:
return rc;
@@ -598,19 +582,16 @@ ecryptfs_commit_lower_page(struct page *
struct file *lower_file, int byte_offset,
int region_size)
{
- int page_locked = 1;
int rc = 0;
rc = lower_inode->i_mapping->a_ops->commit_write(
lower_file, lower_page, byte_offset, region_size);
- if (rc == AOP_TRUNCATED_PAGE)
- page_locked = 0;
if (rc < 0) {
ecryptfs_printk(KERN_ERR,
"Error committing write; rc = [%d]\n", rc);
} else
rc = 0;
- ecryptfs_release_lower_page(lower_page, page_locked);
+ ecryptfs_release_lower_page(lower_page);
return rc;
}
Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -1987,8 +1987,11 @@ again:
ret = aops->readpage(file, page);
page_cache_release(page);
if (ret) {
- if (ret == AOP_TRUNCATED_PAGE)
- goto again;
+ /*
+ * ret cannot be AOP_TRUNCATED_PAGE, because
+ * the only filesystems that return that from
+ * ->readpage actually use ->write_begin
+ */
return ret;
}
goto again;
@@ -1996,13 +1999,10 @@ again:
ret = aops->prepare_write(file, page, offset, offset+len);
if (ret) {
- if (ret != AOP_TRUNCATED_PAGE)
- unlock_page(page);
+ unlock_page(page);
page_cache_release(page);
if (pos + len > inode->i_size)
vmtruncate(inode, inode->i_size);
- if (ret == AOP_TRUNCATED_PAGE)
- goto again;
}
return ret;
}
@@ -2027,7 +2027,6 @@ int pagecache_write_end(struct file *fil
ret = aops->commit_write(file, page, offset, offset+len);
unlock_page(page);
page_cache_release(page);
- BUG_ON(ret == AOP_TRUNCATED_PAGE); /* can't deal with */
if (ret < 0) {
if (pos + len > inode->i_size)
@@ -2258,8 +2257,7 @@ static ssize_t generic_perform_write_2co
continue;
fs_write_aop_error:
- if (status != AOP_TRUNCATED_PAGE)
- unlock_page(page);
+ unlock_page(page);
page_cache_release(page);
if (src_page)
page_cache_release(src_page);
@@ -2271,10 +2269,7 @@ fs_write_aop_error:
*/
if (pos + bytes > inode->i_size)
vmtruncate(inode, inode->i_size);
- if (status == AOP_TRUNCATED_PAGE)
- continue;
- else
- break;
+ break;
} while (iov_iter_count(i));
return written ? written : status;
Index: linux-2.6/include/linux/fs.h
===================================================================
--- linux-2.6.orig/include/linux/fs.h
+++ linux-2.6/include/linux/fs.h
@@ -378,7 +378,7 @@ 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
--
-
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