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ext4: fix incorrect options show of original mount_opt and extend mount_opt2 

[ Upstream commit e3645d72f8 ]

Current _ext4_show_options() do not distinguish MOPT_2 flag, so it mixed
extend sbi->s_mount_opt2 options with sbi->s_mount_opt, it could lead to
show incorrect options, e.g. show fc_debug_force if we mount with
errors=continue mode and miss it if we set.

  $ mkfs.ext4 /dev/pmem0
  $ mount -o errors=remount-ro /dev/pmem0 /mnt
  $ cat /proc/fs/ext4/pmem0/options | grep fc_debug_force
    #empty
  $ mount -o remount,errors=continue /mnt
  $ cat /proc/fs/ext4/pmem0/options | grep fc_debug_force
    fc_debug_force
  $ mount -o remount,errors=remount-ro,fc_debug_force /mnt
  $ cat /proc/fs/ext4/pmem0/options | grep fc_debug_force
    #empty

Fixes: 995a3ed67f ("ext4: add fast_commit feature and handling for extended mount options")
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230129034939.3702550-1-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhang Yi 2023-01-29 11:49:39 +08:00 committed by Greg Kroah-Hartman
parent 2b7cf1bcd4
commit f19d8f9368
2 changed files with 22 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/ext4/ext4.h
View File

@ -1529,6 +1529,7 @@ struct ext4_sb_info {
unsigned int s_mount_opt2;
unsigned long s_mount_flags;
unsigned int s_def_mount_opt;
unsigned int s_def_mount_opt2;
ext4_fsblk_t s_sb_block;
atomic64_t s_resv_clusters;
kuid_t s_resuid;

28
fs/ext4/super.c
View File

@ -2894,7 +2894,7 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
int def_errors, def_mount_opt = sbi->s_def_mount_opt;
int def_errors;
const struct mount_opts *m;
char sep = nodefs ? '\n' : ',';
@ -2906,15 +2906,28 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
for (m = ext4_mount_opts; m->token != Opt_err; m++) {
int want_set = m->flags & MOPT_SET;
int opt_2 = m->flags & MOPT_2;
unsigned int mount_opt, def_mount_opt;
if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
m->flags & MOPT_SKIP)
continue;
if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
continue; /* skip if same as the default */
if (opt_2) {
mount_opt = sbi->s_mount_opt2;
def_mount_opt = sbi->s_def_mount_opt2;
} else {
mount_opt = sbi->s_mount_opt;
def_mount_opt = sbi->s_def_mount_opt;
}
/* skip if same as the default */
if (!nodefs && !(m->mount_opt & (mount_opt ^ def_mount_opt)))
continue;
/* select Opt_noFoo vs Opt_Foo */
if ((want_set &&
(sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
(!want_set && (sbi->s_mount_opt & m->mount_opt)))
continue; /* select Opt_noFoo vs Opt_Foo */
(mount_opt & m->mount_opt) != m->mount_opt) ||
(!want_set && (mount_opt & m->mount_opt)))
continue;
SEQ_OPTS_PRINT("%s", token2str(m->token));
}
@ -2942,7 +2955,7 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
if (nodefs || sbi->s_stripe)
SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
if (nodefs || EXT4_MOUNT_DATA_FLAGS &
(sbi->s_mount_opt ^ def_mount_opt)) {
(sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
SEQ_OPTS_PUTS("data=journal");
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
@ -5087,6 +5100,7 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
goto failed_mount;
sbi->s_def_mount_opt = sbi->s_mount_opt;
sbi->s_def_mount_opt2 = sbi->s_mount_opt2;
err = ext4_check_opt_consistency(fc, sb);
if (err < 0)