AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-24 04:20:53 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

ext4: make ext4_ind_map_blocks work with fiemap

Browse Source 
For indirect block mapping if the i_block > max supported block in inode
then ext4_ind_map_blocks() returns a -EIO error. But in case of fiemap
this could be a valid query to ->iomap_begin call.
So check if the offset >= s_bitmap_maxbytes in ext4_iomap_begin_report(),
then simply skip calling ext4_map_blocks().

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/87fa0ddc5967fa707656212a3b66a7233425325c.1582880246.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Ritesh Harjani 2020-02-28 14:56:57 +05:30 committed by Theodore Ts'o
parent ac58e4fb03
commit b2c5764262
1 changed files with 16 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/ext4/inode.c
View File

@ -3546,12 +3546,28 @@ static int ext4_iomap_begin_report(struct inode *inode, loff_t offset,
map.m_len = min_t(loff_t, (offset + length - 1) >> blkbits,
EXT4_MAX_LOGICAL_BLOCK) - map.m_lblk + 1;
/*
* Fiemap callers may call for offset beyond s_bitmap_maxbytes.
* So handle it here itself instead of querying ext4_map_blocks().
* Since ext4_map_blocks() will warn about it and will return
* -EIO error.
*/
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
if (offset >= sbi->s_bitmap_maxbytes) {
map.m_flags = 0;
goto set_iomap;
}
}
ret = ext4_map_blocks(NULL, inode, &map, 0);
if (ret < 0)
return ret;
if (ret == 0)
delalloc = ext4_iomap_is_delalloc(inode, &map);
set_iomap:
ext4_set_iomap(inode, iomap, &map, offset, length);
if (delalloc && iomap->type == IOMAP_HOLE)
iomap->type = IOMAP_DELALLOC;