From: Ojaswin Mujoo ojaswin@linux.ibm.com
commit e4e58e5df309d695799c494958962100a4c25039 upstream.
In __ext4_super() we always overwrote the user specified journal_ioprio value with a default value, expecting parse_apply_sb_mount_options() to later correctly set ctx->journal_ioprio to the user specified value. However, if parse_apply_sb_mount_options() returned early because of empty sbi->es_s->s_mount_opts, the correct journal_ioprio value was never set.
This patch fixes __ext4_super() to only use the default value if the user has not specified any value for journal_ioprio.
Similarly, the remount behavior was to either use journal_ioprio value specified during initial mount, or use the default value irrespective of the journal_ioprio value specified during remount. This patch modifies this to first check if a new value for ioprio has been passed during remount and apply it. If no new value is passed, use the value specified during initial mount.
Signed-off-by: Ojaswin Mujoo ojaswin@linux.ibm.com Reviewed-by: Ritesh Harjani riteshh@linux.ibm.com Tested-by: Ritesh Harjani riteshh@linux.ibm.com Link: https://lore.kernel.org/r/20220418083545.45778-1-ojaswin@linux.ibm.com Signed-off-by: Theodore Ts'o tytso@mit.edu Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ext4/super.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)
--- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4410,7 +4410,8 @@ static int __ext4_fill_super(struct fs_c int silent = fc->sb_flags & SB_SILENT;
/* Set defaults for the variables that will be set during parsing */ - ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO; + if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) + ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; sbi->s_sectors_written_start = @@ -6277,7 +6278,6 @@ static int __ext4_remount(struct fs_cont char *to_free[EXT4_MAXQUOTAS]; #endif
- ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
/* Store the original options */ old_sb_flags = sb->s_flags; @@ -6303,9 +6303,14 @@ static int __ext4_remount(struct fs_cont } else old_opts.s_qf_names[i] = NULL; #endif - if (sbi->s_journal && sbi->s_journal->j_task->io_context) - ctx->journal_ioprio = - sbi->s_journal->j_task->io_context->ioprio; + if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) { + if (sbi->s_journal && sbi->s_journal->j_task->io_context) + ctx->journal_ioprio = + sbi->s_journal->j_task->io_context->ioprio; + else + ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO; + + }
ext4_apply_options(fc, sb);