status = map->m_flags & EXT4_MAP_UNWRITTEN ?
EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
if (!(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) &&
+ !(status & EXTENT_STATUS_WRITTEN) &&
ext4_find_delalloc_range(inode, map->m_lblk,
map->m_lblk + map->m_len - 1))
status |= EXTENT_STATUS_DELAYED;
status = map->m_flags & EXT4_MAP_UNWRITTEN ?
EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN;
if (!(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) &&
+ !(status & EXTENT_STATUS_WRITTEN) &&
ext4_find_delalloc_range(inode, map->m_lblk,
map->m_lblk + map->m_len - 1))
status |= EXTENT_STATUS_DELAYED;
* `handle' can be NULL if create is zero
*/
struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
- ext4_lblk_t block, int create)
+ ext4_lblk_t block, int map_flags)
{
struct ext4_map_blocks map;
struct buffer_head *bh;
+ int create = map_flags & EXT4_GET_BLOCKS_CREATE;
int err;
J_ASSERT(handle != NULL || create == 0);
map.m_lblk = block;
map.m_len = 1;
- err = ext4_map_blocks(handle, inode, &map,
- create ? EXT4_GET_BLOCKS_CREATE : 0);
+ err = ext4_map_blocks(handle, inode, &map, map_flags);
if (err == 0)
return create ? ERR_PTR(-ENOSPC) : NULL;
}
struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
- ext4_lblk_t block, int create)
+ ext4_lblk_t block, int map_flags)
{
struct buffer_head *bh;
- bh = ext4_getblk(handle, inode, block, create);
+ bh = ext4_getblk(handle, inode, block, map_flags);
if (IS_ERR(bh))
return bh;
if (!bh || buffer_uptodate(bh))
ext4_walk_page_buffers(handle, page_bufs, 0, len,
NULL, bget_one);
}
- /* As soon as we unlock the page, it can go away, but we have
- * references to buffers so we are safe */
+ /*
+ * We need to release the page lock before we start the
+ * journal, so grab a reference so the page won't disappear
+ * out from under us.
+ */
+ get_page(page);
unlock_page(page);
handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE,
ext4_writepage_trans_blocks(inode));
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
- goto out;
+ put_page(page);
+ goto out_no_pagelock;
}
-
BUG_ON(!ext4_handle_valid(handle));
+ lock_page(page);
+ put_page(page);
+ if (page->mapping != mapping) {
+ /* The page got truncated from under us */
+ ext4_journal_stop(handle);
+ ret = 0;
+ goto out;
+ }
+
if (inline_data) {
BUFFER_TRACE(inode_bh, "get write access");
ret = ext4_journal_get_write_access(handle, inode_bh);
NULL, bput_one);
ext4_set_inode_state(inode, EXT4_STATE_JDATA);
out:
+ unlock_page(page);
+out_no_pagelock:
brelse(inode_bh);
return ret;
}
int inode_size = EXT4_INODE_SIZE(sb);
oi.orig_ino = orig_ino;
- ino = orig_ino & ~(inodes_per_block - 1);
+ ino = (orig_ino & ~(inodes_per_block - 1)) + 1;
for (i = 0; i < inodes_per_block; i++, ino++, buf += inode_size) {
if (ino == orig_ino)
continue;