ocfs2: properly update i_mtime on buffered write
We weren't always updating i_mtime on writes, so fix ocfs2_commit_write() to
handle this.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Acked-by: Zach Brown <zach.brown@oracle.com>
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index f1d1c34..3d7c082 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -391,31 +391,28 @@
static int ocfs2_commit_write(struct file *file, struct page *page,
unsigned from, unsigned to)
{
- int ret, extending = 0, locklevel = 0;
- loff_t new_i_size;
+ int ret;
struct buffer_head *di_bh = NULL;
struct inode *inode = page->mapping->host;
struct ocfs2_journal_handle *handle = NULL;
+ struct ocfs2_dinode *di;
mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to);
/* NOTE: ocfs2_file_aio_write has ensured that it's safe for
- * us to sample inode->i_size here without the metadata lock:
+ * us to continue here without rechecking the I/O against
+ * changed inode values.
*
* 1) We're currently holding the inode alloc lock, so no
* nodes can change it underneath us.
*
* 2) We've had to take the metadata lock at least once
- * already to check for extending writes, hence insuring
- * that our current copy is also up to date.
+ * already to check for extending writes, suid removal, etc.
+ * The meta data update code then ensures that we don't get a
+ * stale inode allocation image (i_size, i_clusters, etc).
*/
- new_i_size = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
- if (new_i_size > i_size_read(inode)) {
- extending = 1;
- locklevel = 1;
- }
- ret = ocfs2_meta_lock_with_page(inode, NULL, &di_bh, locklevel, page);
+ ret = ocfs2_meta_lock_with_page(inode, NULL, &di_bh, 1, page);
if (ret != 0) {
mlog_errno(ret);
goto out;
@@ -427,23 +424,20 @@
goto out_unlock_meta;
}
- if (extending) {
- handle = ocfs2_start_walk_page_trans(inode, page, from, to);
- if (IS_ERR(handle)) {
- ret = PTR_ERR(handle);
- handle = NULL;
- goto out_unlock_data;
- }
+ handle = ocfs2_start_walk_page_trans(inode, page, from, to);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ goto out_unlock_data;
+ }
- /* Mark our buffer early. We'd rather catch this error up here
- * as opposed to after a successful commit_write which would
- * require us to set back inode->i_size. */
- ret = ocfs2_journal_access(handle, inode, di_bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
- if (ret < 0) {
- mlog_errno(ret);
- goto out_commit;
- }
+ /* Mark our buffer early. We'd rather catch this error up here
+ * as opposed to after a successful commit_write which would
+ * require us to set back inode->i_size. */
+ ret = ocfs2_journal_access(handle, inode, di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out_commit;
}
/* might update i_size */
@@ -453,37 +447,28 @@
goto out_commit;
}
- if (extending) {
- loff_t size = (u64) i_size_read(inode);
- struct ocfs2_dinode *di =
- (struct ocfs2_dinode *)di_bh->b_data;
+ di = (struct ocfs2_dinode *)di_bh->b_data;
- /* ocfs2_mark_inode_dirty is too heavy to use here. */
- inode->i_blocks = ocfs2_align_bytes_to_sectors(size);
- inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+ /* ocfs2_mark_inode_dirty() is too heavy to use here. */
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
+ di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
- di->i_size = cpu_to_le64(size);
- di->i_ctime = di->i_mtime =
- cpu_to_le64(inode->i_mtime.tv_sec);
- di->i_ctime_nsec = di->i_mtime_nsec =
- cpu_to_le32(inode->i_mtime.tv_nsec);
+ inode->i_blocks = ocfs2_align_bytes_to_sectors((u64)(i_size_read(inode)));
+ di->i_size = cpu_to_le64((u64)i_size_read(inode));
- ret = ocfs2_journal_dirty(handle, di_bh);
- if (ret < 0) {
- mlog_errno(ret);
- goto out_commit;
- }
+ ret = ocfs2_journal_dirty(handle, di_bh);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out_commit;
}
- BUG_ON(extending && (i_size_read(inode) != new_i_size));
-
out_commit:
- if (handle)
- ocfs2_commit_trans(handle);
+ ocfs2_commit_trans(handle);
out_unlock_data:
ocfs2_data_unlock(inode, 1);
out_unlock_meta:
- ocfs2_meta_unlock(inode, locklevel);
+ ocfs2_meta_unlock(inode, 1);
out:
if (di_bh)
brelse(di_bh);