ext4: handle option set by mount flags correctly
Currently there is a problem with mount options that can be both set by vfs using mount flags or by a string parsing in ext4. i_version/iversion options gets lost after remount, for example $ mount -o i_version /dev/pmem0 /mnt $ grep pmem0 /proc/self/mountinfo | grep i_version 310 95 259:0 / /mnt rw,relatime shared:163 - ext4 /dev/pmem0 rw,seclabel,i_version $ mount -o remount,ro /mnt $ grep pmem0 /proc/self/mountinfo | grep i_version nolazytime gets ignored by ext4 on remount, for example $ mount -o lazytime /dev/pmem0 /mnt $ grep pmem0 /proc/self/mountinfo | grep lazytime 310 95 259:0 / /mnt rw,relatime shared:163 - ext4 /dev/pmem0 rw,lazytime,seclabel $ mount -o remount,nolazytime /mnt $ grep pmem0 /proc/self/mountinfo | grep lazytime 310 95 259:0 / /mnt rw,relatime shared:163 - ext4 /dev/pmem0 rw,lazytime,seclabel Fix it by applying the SB_LAZYTIME and SB_I_VERSION flags from *flags to s_flags before we parse the option and use the resulting state of the same flags in *flags at the end of successful remount. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com> Link: https://lore.kernel.org/r/20200723150526.19931-1-lczerner@redhat.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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@ -5512,7 +5512,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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{
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struct ext4_super_block *es;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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unsigned long old_sb_flags;
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unsigned long old_sb_flags, vfs_flags;
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struct ext4_mount_options old_opts;
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int enable_quota = 0;
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ext4_group_t g;
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@ -5555,6 +5555,14 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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if (sbi->s_journal && sbi->s_journal->j_task->io_context)
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journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
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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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* either way we need to make sure it matches in both *flags and
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* s_flags. Copy those selected flags from *flags to s_flags
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*/
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vfs_flags = SB_LAZYTIME | SB_I_VERSION;
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sb->s_flags = (sb->s_flags & ~vfs_flags) | (*flags & vfs_flags);
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if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
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err = -EINVAL;
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goto restore_opts;
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@ -5608,9 +5616,6 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
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}
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if (*flags & SB_LAZYTIME)
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sb->s_flags |= SB_LAZYTIME;
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if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
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if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
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err = -EROFS;
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@ -5758,7 +5763,13 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
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}
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#endif
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*flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
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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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* either way we need to make sure it matches in both *flags and
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* s_flags. Copy those selected flags from s_flags to *flags
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*/
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*flags = (*flags & ~vfs_flags) | (sb->s_flags & vfs_flags);
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ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
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kfree(orig_data);
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return 0;
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