ext4: update EOFBLOCKS flag on fallocate properly

EOFBLOCK_FL should be updated if called w/o FALLOCATE_FL_KEEP_SIZE
Currently it happens only if new extent was allocated.

TESTCASE:
fallocate test_file -n -l4096
fallocate test_file -l4096
Last fallocate cmd has updated size, but keept EOFBLOCK_FL set. And
fsck will complain about that.

Also remove ping pong in ext4_fallocate() in case of new extents,
where ext4_ext_map_blocks() clear EOFBLOCKS bit, and later
ext4_falloc_update_inode() restore it again.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 4546da4..3647ae0 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -539,6 +539,8 @@ struct ext4_new_group_data {
 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT          0x0020
        /* Don't normalize allocation size (used for fallocate) */
 #define EXT4_GET_BLOCKS_NO_NORMALIZE           0x0040
+       /* Request will not result in inode size update (user for fallocate) */
+#define EXT4_GET_BLOCKS_KEEP_SIZE              0x0080
 
 /*
  * Flags used by ext4_free_blocks

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index d0e3f33..8686eb7 100644 (file)
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3432,14 +3432,8 @@ 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);
-       if (ret >= 0) {
+       if (ret >= 0)
                ext4_update_inode_fsync_trans(handle, inode, 1);
-               err = check_eofblocks_fl(handle, inode, map->m_lblk, path,
-                                        map->m_len);
-               if (err < 0)
-                       goto out2;
-       }
-
 out:
        if (ret <= 0) {
                err = ret;
@@ -3480,6 +3474,12 @@ out:
 
 map_out:
        map->m_flags |= EXT4_MAP_MAPPED;
+       if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) {
+               err = check_eofblocks_fl(handle, inode, map->m_lblk, path,
+                                        map->m_len);
+               if (err < 0)
+                       goto out2;
+       }
 out1:
        if (allocated > map->m_len)
                allocated = map->m_len;
@@ -3955,7 +3955,10 @@ got_allocated_blocks:
                        map->m_flags |= EXT4_MAP_UNINIT;
        }
 
-       err = check_eofblocks_fl(handle, inode, map->m_lblk, path, ar.len);
+       err = 0;
+       if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0)
+               err = check_eofblocks_fl(handle, inode, map->m_lblk,
+                                        path, ar.len);
        if (!err)
                err = ext4_ext_insert_extent(handle, inode, path,
                                             &newex, flags);
@@ -4214,6 +4217,7 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
        int ret = 0;
        int ret2 = 0;
        int retries = 0;
+       int flags;
        struct ext4_map_blocks map;
        unsigned int credits, blkbits = inode->i_blkbits;
 
@@ -4250,6 +4254,10 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
                trace_ext4_fallocate_exit(inode, offset, max_blocks, ret);
                return ret;
        }
+       flags = EXT4_GET_BLOCKS_CREATE_UNINIT_EXT |
+               EXT4_GET_BLOCKS_NO_NORMALIZE;
+       if (mode & FALLOC_FL_KEEP_SIZE)
+               flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
 retry:
        while (ret >= 0 && ret < max_blocks) {
                map.m_lblk = map.m_lblk + ret;
@@ -4259,9 +4267,7 @@ retry:
                        ret = PTR_ERR(handle);
                        break;
                }
-               ret = ext4_map_blocks(handle, inode, &map,
-                                     EXT4_GET_BLOCKS_CREATE_UNINIT_EXT |
-                                     EXT4_GET_BLOCKS_NO_NORMALIZE);
+               ret = ext4_map_blocks(handle, inode, &map, flags);
                if (ret <= 0) {
 #ifdef EXT4FS_DEBUG
                        WARN_ON(ret <= 0);

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index ff6aace..87ec615 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -477,9 +477,11 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
         */
        down_read((&EXT4_I(inode)->i_data_sem));
        if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
-               retval = ext4_ext_map_blocks(handle, inode, map, 0);
+               retval = ext4_ext_map_blocks(handle, inode, map, flags &
+                                            EXT4_GET_BLOCKS_KEEP_SIZE);
        } else {
-               retval = ext4_ind_map_blocks(handle, inode, map, 0);
+               retval = ext4_ind_map_blocks(handle, inode, map, flags &
+                                            EXT4_GET_BLOCKS_KEEP_SIZE);
        }
        up_read((&EXT4_I(inode)->i_data_sem));