malhuda/msm-4.14
1
0
Fork 0
mirror of https://github.com/rd-stuffs/msm-4.14.git synced 2025-02-20 11:45:48 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

ext4: fix check to prevent initializing reserved inodes

Browse Source 
Commit 8844618d8aa7: "ext4: only look at the bg_flags field if it is
valid" will complain if block group zero does not have the
EXT4_BG_INODE_ZEROED flag set.  Unfortunately, this is not correct,
since a freshly created file system has this flag cleared.  It gets
almost immediately after the file system is mounted read-write --- but
the following somewhat unlikely sequence will end up triggering a
false positive report of a corrupted file system:

   mkfs.ext4 /dev/vdc
   mount -o ro /dev/vdc /vdc
   mount -o remount,rw /dev/vdc

Instead, when initializing the inode table for block group zero, test
to make sure that itable_unused count is not too large, since that is
the case that will result in some or all of the reserved inodes
getting cleared.

This fixes the failures reported by Eric Whiteney when running
generic/230 and generic/231 in the the nojournal test case.

Fixes: 8844618d8aa7 ("ext4: only look at the bg_flags field if it is valid")
Reported-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Git-Repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Git-Commit: 5012284700775a4e6e3fbe7eac4c543c4874b559
Change-Id: I9ae663e67e6ee32ef0c0e98a9e0ae9193cf7c880
Signed-off-by: Ankit Jain <jankit@codeaurora.org>
This commit is contained in:
Theodore Ts'o 2018-07-28 08:12:04 -04:00 committed by Ankit Jain
parent 88532b424b
commit ca05d702a3
2 changed files with 5 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
fs/ext4/ialloc.c
View File

@ -1394,7 +1394,10 @@ int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
ext4_itable_unused_count(sb, gdp)),
sbi->s_inodes_per_block);
if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) {
if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group) ||
((group == 0) && ((EXT4_INODES_PER_GROUP(sb) -
ext4_itable_unused_count(sb, gdp)) <
EXT4_FIRST_INO(sb)))) {
ext4_error(sb, "Something is wrong with group %u: "
"used itable blocks: %d; "
"itable unused count: %u",

8
fs/ext4/super.c
View File

@ -3100,14 +3100,8 @@ static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
if (!gdp)
continue;
if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))
continue;
if (group != 0)
if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
break;
ext4_error(sb, "Inode table for bg 0 marked as "
"needing zeroing");
if (sb_rdonly(sb))
return ngroups;
}
return group;