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ext4: correctly restore system zone info when remount fails
When remounting filesystem fails late during remount handling and block_validity mount option is also changed during the remount, we fail to restore system zone information to a state matching the mount option. This is mostly harmless, just the block validity checking will not match the situation described by the mount option. Make sure these two are always consistent. Reported-by: Lukas Czerner <lczerner@redhat.com> Reviewed-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20200728130437.7804-7-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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@ -220,14 +220,6 @@ int ext4_setup_system_zone(struct super_block *sb)
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int flex_size = ext4_flex_bg_size(sbi);
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int ret;
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if (!test_opt(sb, BLOCK_VALIDITY)) {
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if (sbi->system_blks)
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ext4_release_system_zone(sb);
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return 0;
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}
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if (sbi->system_blks)
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return 0;
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system_blks = kzalloc(sizeof(*system_blks), GFP_KERNEL);
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if (!system_blks)
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return -ENOMEM;
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@ -4727,11 +4727,13 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
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ext4_set_resv_clusters(sb);
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err = ext4_setup_system_zone(sb);
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if (err) {
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ext4_msg(sb, KERN_ERR, "failed to initialize system "
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"zone (%d)", err);
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goto failed_mount4a;
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if (test_opt(sb, BLOCK_VALIDITY)) {
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err = ext4_setup_system_zone(sb);
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if (err) {
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ext4_msg(sb, KERN_ERR, "failed to initialize system "
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"zone (%d)", err);
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goto failed_mount4a;
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}
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}
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ext4_ext_init(sb);
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@ -5747,9 +5749,16 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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ext4_register_li_request(sb, first_not_zeroed);
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}
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err = ext4_setup_system_zone(sb);
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if (err)
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goto restore_opts;
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/*
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* Handle creation of system zone data early because it can fail.
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* Releasing of existing data is done when we are sure remount will
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* succeed.
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*/
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if (test_opt(sb, BLOCK_VALIDITY) && !sbi->system_blks) {
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err = ext4_setup_system_zone(sb);
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if (err)
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goto restore_opts;
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}
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if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
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err = ext4_commit_super(sb, 1);
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@ -5771,6 +5780,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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}
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}
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#endif
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if (!test_opt(sb, BLOCK_VALIDITY) && sbi->system_blks)
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ext4_release_system_zone(sb);
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/*
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* Some options can be enabled by ext4 and/or by VFS mount flag
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@ -5792,6 +5803,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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sbi->s_commit_interval = old_opts.s_commit_interval;
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sbi->s_min_batch_time = old_opts.s_min_batch_time;
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sbi->s_max_batch_time = old_opts.s_max_batch_time;
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if (!test_opt(sb, BLOCK_VALIDITY) && sbi->system_blks)
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ext4_release_system_zone(sb);
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#ifdef CONFIG_QUOTA
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sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
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for (i = 0; i < EXT4_MAXQUOTAS; i++) {
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