diff options
author | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-05-13 23:02:19 -0400 |
---|---|---|
committer | Theodore Ts'o <tytso@mit.edu> | 2018-05-13 23:02:19 -0400 |
commit | c89128a008381478121a76537762eb3a62052971 (patch) | |
tree | cd2c288c593548436d55a79e790b5f1d33dc6bd5 /fs/ext4/super.c | |
parent | db6516a5e7ddb6dc72d167b920f2f272596ea22d (diff) | |
download | linux-stable-c89128a008381478121a76537762eb3a62052971.tar.gz linux-stable-c89128a008381478121a76537762eb3a62052971.tar.bz2 linux-stable-c89128a008381478121a76537762eb3a62052971.zip |
ext4: handle errors on ext4_commit_super
When remounting ext4 from ro to rw, currently it allows its transition,
even if ext4_commit_super() returns EIO. Even worse thing is, after that,
fs/buffer complains buffer dirty bits like:
Call trace:
[<ffffff9750c259dc>] mark_buffer_dirty+0x184/0x1a4
[<ffffff9750cb398c>] __ext4_handle_dirty_super+0x4c/0xfc
[<ffffff9750c7a9fc>] ext4_file_open+0x154/0x1c0
[<ffffff9750bea51c>] do_dentry_open+0x114/0x2d0
[<ffffff9750bea75c>] vfs_open+0x5c/0x94
[<ffffff9750bf879c>] path_openat+0x668/0xfe8
[<ffffff9750bf8088>] do_filp_open+0x74/0x120
[<ffffff9750beac98>] do_sys_open+0x148/0x254
[<ffffff9750beade0>] SyS_openat+0x10/0x18
[<ffffff9750a83ab0>] el0_svc_naked+0x24/0x28
EXT4-fs (dm-1): previous I/O error to superblock detected
Buffer I/O error on dev dm-1, logical block 0, lost sync page write
EXT4-fs (dm-1): re-mounted. Opts: (null)
Buffer I/O error on dev dm-1, logical block 80, lost async page write
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/super.c')
-rw-r--r-- | fs/ext4/super.c | 35 |
1 files changed, 21 insertions, 14 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index d6d6e7db73d6..1388e56bb3f5 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2146,12 +2146,12 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, int read_only) { struct ext4_sb_info *sbi = EXT4_SB(sb); - int res = 0; + int err = 0; if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { ext4_msg(sb, KERN_ERR, "revision level too high, " "forcing read-only mode"); - res = SB_RDONLY; + err = -EROFS; } if (read_only) goto done; @@ -2184,7 +2184,7 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, if (sbi->s_journal) ext4_set_feature_journal_needs_recovery(sb); - ext4_commit_super(sb, 1); + err = ext4_commit_super(sb, 1); done: if (test_opt(sb, DEBUG)) printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " @@ -2196,7 +2196,7 @@ done: sbi->s_mount_opt, sbi->s_mount_opt2); cleancache_init_fs(sb); - return res; + return err; } int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) @@ -4254,8 +4254,12 @@ no_journal: goto failed_mount4; } - if (ext4_setup_super(sb, es, sb_rdonly(sb))) + ret = ext4_setup_super(sb, es, sb_rdonly(sb)); + if (ret == -EROFS) { sb->s_flags |= SB_RDONLY; + ret = 0; + } else if (ret) + goto failed_mount4a; /* determine the minimum size of new large inodes, if present */ if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE && @@ -4790,11 +4794,7 @@ static int ext4_commit_super(struct super_block *sb, int sync) unlock_buffer(sbh); error = __sync_dirty_buffer(sbh, REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0)); - if (error) - return error; - - error = buffer_write_io_error(sbh); - if (error) { + if (buffer_write_io_error(sbh)) { ext4_msg(sb, KERN_ERR, "I/O error while writing " "superblock"); clear_buffer_write_io_error(sbh); @@ -5195,8 +5195,12 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) if (sbi->s_journal) ext4_clear_journal_err(sb, es); sbi->s_mount_state = le16_to_cpu(es->s_state); - if (!ext4_setup_super(sb, es, 0)) - sb->s_flags &= ~SB_RDONLY; + + err = ext4_setup_super(sb, es, 0); + if (err) + goto restore_opts; + + sb->s_flags &= ~SB_RDONLY; if (ext4_has_feature_mmp(sb)) if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) { @@ -5220,8 +5224,11 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) } ext4_setup_system_zone(sb); - if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) - ext4_commit_super(sb, 1); + if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) { + err = ext4_commit_super(sb, 1); + if (err) + goto restore_opts; + } #ifdef CONFIG_QUOTA /* Release old quota file names */ |