From: Robin Dong <sanbai@xxxxxxxxxx>
Signed-off-by: Robin Dong <sanbai@xxxxxxxxxx>
---
fs/ext4/extents.c | 34 ++++++++++++++++++++++++++++++++--
1 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f84c122..7e3d4c8 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3533,8 +3533,11 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path, int flags,
unsigned int allocated, ext4_fsblk_t newblock)
{
+ struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+ struct ext4_map_blocks convert_map;
int ret = 0;
int err = 0;
+ int offset;
ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
ext_debug("ext4_ext_handle_uninitialized_extents: inode %lu, logical"
@@ -3598,8 +3601,14 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
}
/* buffered write, writepage time, convert*/
- ret = ext4_ext_convert_to_initialized(handle, inode, map, path);
+ offset = map->m_lblk & (sbi->s_cluster_ratio - 1);
+ convert_map.m_len =
+ EXT4_C2B(sbi, EXT4_NUM_B2C(sbi, offset + map->m_len));
+ convert_map.m_lblk = map->m_lblk - offset;
+ ret = ext4_ext_convert_to_initialized(handle, inode,
+ &convert_map, path);
if (ret >= 0) {
+ ret = map->m_len;
ext4_update_inode_fsync_trans(handle, inode, 1);
err = check_eofblocks_fl(handle, inode, map->m_lblk, path,
map->m_len);
@@ -4318,8 +4327,9 @@ static void ext4_falloc_update_inode(struct inode *inode,
long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
{
struct inode *inode = file->f_path.dentry->d_inode;
+ struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
handle_t *handle;
- loff_t new_size;
+ loff_t new_size, old_size;
unsigned int max_blocks;
int ret = 0;
int ret2 = 0;
@@ -4349,6 +4359,8 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
*/
max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits)
- map.m_lblk;
+
+ old_size = i_size_read(inode);
/*
* credits to insert 1 extent into extent tree
*/
@@ -4403,6 +4415,24 @@ retry:
goto retry;
}
mutex_unlock(&inode->i_mutex);
+
+ /* if the fallocate expand the file size, we need to zeroout
+ * extra pages in cluster */
+ if (len + offset > old_size) {
+ credits = ext4_chunk_trans_blocks(inode, sbi->s_cluster_ratio);
+ handle = ext4_journal_start(inode, credits);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ goto out;
+ }
+ ext4_ext_truncate_zero_pages(handle, inode, old_size);
+ if (IS_SYNC(inode))
+ ext4_handle_sync(handle);
+ ext4_mark_inode_dirty(handle, inode);
+ ext4_journal_stop(handle);
+ }
+
+out:
trace_ext4_fallocate_exit(inode, offset, max_blocks,
ret > 0 ? ret2 : ret);
return ret > 0 ? ret2 : ret;
--
1.7.3.2
--
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