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>

diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c
index 2d008c1..c54ba52 100644 (file)
--- a/fs/ext4/block_validity.c
+++ b/fs/ext4/block_validity.c
@@ -220,14 +220,6 @@ int ext4_setup_system_zone(struct super_block *sb)
        int flex_size = ext4_flex_bg_size(sbi);
        int ret;
 
-       if (!test_opt(sb, BLOCK_VALIDITY)) {
-               if (sbi->system_blks)
-                       ext4_release_system_zone(sb);
-               return 0;
-       }
-       if (sbi->system_blks)
-               return 0;
-
        system_blks = kzalloc(sizeof(*system_blks), GFP_KERNEL);
        if (!system_blks)
                return -ENOMEM;

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 6507e30..0892d71 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4727,11 +4727,13 @@ no_journal:
 
        ext4_set_resv_clusters(sb);
 
-       err = ext4_setup_system_zone(sb);
-       if (err) {
-               ext4_msg(sb, KERN_ERR, "failed to initialize system "
-                        "zone (%d)", err);
-               goto failed_mount4a;
+       if (test_opt(sb, BLOCK_VALIDITY)) {
+               err = ext4_setup_system_zone(sb);
+               if (err) {
+                       ext4_msg(sb, KERN_ERR, "failed to initialize system "
+                                "zone (%d)", err);
+                       goto failed_mount4a;
+               }
        }
 
        ext4_ext_init(sb);
@@ -5747,9 +5749,16 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
                ext4_register_li_request(sb, first_not_zeroed);
        }
 
-       err = ext4_setup_system_zone(sb);
-       if (err)
-               goto restore_opts;
+       /*
+        * Handle creation of system zone data early because it can fail.
+        * Releasing of existing data is done when we are sure remount will
+        * succeed.
+        */
+       if (test_opt(sb, BLOCK_VALIDITY) && !sbi->system_blks) {
+               err = ext4_setup_system_zone(sb);
+               if (err)
+                       goto restore_opts;
+       }
 
        if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
                err = ext4_commit_super(sb, 1);
@@ -5771,6 +5780,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
                }
        }
 #endif
+       if (!test_opt(sb, BLOCK_VALIDITY) && sbi->system_blks)
+               ext4_release_system_zone(sb);
 
        /*
         * Some options can be enabled by ext4 and/or by VFS mount flag
@@ -5792,6 +5803,8 @@ restore_opts:
        sbi->s_commit_interval = old_opts.s_commit_interval;
        sbi->s_min_batch_time = old_opts.s_min_batch_time;
        sbi->s_max_batch_time = old_opts.s_max_batch_time;
+       if (!test_opt(sb, BLOCK_VALIDITY) && sbi->system_blks)
+               ext4_release_system_zone(sb);
 #ifdef CONFIG_QUOTA
        sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
        for (i = 0; i < EXT4_MAXQUOTAS; i++) {