On 2/1/22 7:13 AM, Lukas Czerner wrote:
> After commit 6e47a3cc68fc ("ext4: get rid of super block and sbi from
> handle_mount_ops()") the 'abort' options stopped working. This is
> because we're using ctx_set_mount_flags() helper that's expecting an
> argument with the appropriate bit set, but instead got
> EXT4_MF_FS_ABORTED which is a bit position. ext4_set_mount_flag() is
> using set_bit() while ctx_set_mount_flags() was using bitwise OR.
>
> Create a separate helper ctx_set_mount_flag() to handle setting the
> mount_flags correctly.
>
> While we're at it clean up the EXT4_SET_CTX macros so that we're only
> creating helpers that we actually use to avoid warnings.
>
> Fixes: 6e47a3cc68fc ("ext4: get rid of super block and sbi from handle_mount_ops()")
> Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx>
> Cc: Ye Bin <yebin10@xxxxxxxxxx>
ok thinking out loud here - reducing this to the functional change that
fixes the bug, (apologies for the surely-mangled whitespace, I'm being lazy),
it looks something like:
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index eee0d9ebfa6c..a3047b033053 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2045,8 +2045,8 @@ struct ext4_fs_context {
unsigned int mask_s_mount_opt;
unsigned int vals_s_mount_opt2;
unsigned int mask_s_mount_opt2;
- unsigned int vals_s_mount_flags;
- unsigned int mask_s_mount_flags;
+ unsigned long vals_s_mount_flags;
+ unsigned long mask_s_mount_flags;
unsigned int opt_flags; /* MOPT flags */
unsigned int spec;
u32 s_max_batch_time;
@@ -2165,7 +2165,13 @@ ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag) \
EXT4_SET_CTX(flags);
EXT4_SET_CTX(mount_opt);
EXT4_SET_CTX(mount_opt2);
-EXT4_SET_CTX(mount_flags);
+
+/* Setting the mount_flags field is special, it takes a bit number */
+static inline void ctx_set_mount_flag(struct ext4_fs_context *ctx, int bit)
+{
+ set_bit(bit, &ctx->mask_s_mount_flags);
+ set_bit(bit, &ctx->vals_s_mount_flags);
+}
static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
@@ -2235,7 +2241,7 @@ static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
param->key);
return 0;
case Opt_abort:
- ctx_set_mount_flags(ctx, EXT4_MF_FS_ABORTED);
+ ctx_set_mount_flag(ctx, EXT4_MF_FS_ABORTED);
return 0;
case Opt_i_version:
ext4_msg(NULL, KERN_WARNING, deprecated_msg, param->key, "5.20");
and that makes sense to me. I wonder if there's any further cleanup that could
make it slightly more clear or foolproof re: which flag matches which ctx_set_*
generated function, so the wrong thing doesn't get sent to the wrong routine,
but that's a different issue, so for the patch as you sent it,
Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxx>
> ---
> fs/ext4/super.c | 29 +++++++++++++++++++++--------
> 1 file changed, 21 insertions(+), 8 deletions(-)
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index eee0d9ebfa6c..6f74cd51df2e 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -2045,8 +2045,8 @@ struct ext4_fs_context {
> unsigned int mask_s_mount_opt;
> unsigned int vals_s_mount_opt2;
> unsigned int mask_s_mount_opt2;
> - unsigned int vals_s_mount_flags;
> - unsigned int mask_s_mount_flags;
> + unsigned long vals_s_mount_flags;
> + unsigned long mask_s_mount_flags;
> unsigned int opt_flags; /* MOPT flags */
> unsigned int spec;
> u32 s_max_batch_time;
> @@ -2149,23 +2149,36 @@ static inline void ctx_set_##name(struct ext4_fs_context *ctx, \
> { \
> ctx->mask_s_##name |= flag; \
> ctx->vals_s_##name |= flag; \
> -} \
> +}
> +
> +#define EXT4_CLEAR_CTX(name) \
> static inline void ctx_clear_##name(struct ext4_fs_context *ctx, \
> unsigned long flag) \
> { \
> ctx->mask_s_##name |= flag; \
> ctx->vals_s_##name &= ~flag; \
> -} \
> +}
> +
> +#define EXT4_TEST_CTX(name) \
> static inline unsigned long \
> ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag) \
> { \
> return (ctx->vals_s_##name & flag); \
> -} \
> +}
>
> -EXT4_SET_CTX(flags);
> +EXT4_SET_CTX(flags); /* set only */
> EXT4_SET_CTX(mount_opt);
> +EXT4_CLEAR_CTX(mount_opt);
> +EXT4_TEST_CTX(mount_opt);
> EXT4_SET_CTX(mount_opt2);
> -EXT4_SET_CTX(mount_flags);
> +EXT4_CLEAR_CTX(mount_opt2);
> +EXT4_TEST_CTX(mount_opt2);
> +
> +static inline void ctx_set_mount_flag(struct ext4_fs_context *ctx, int bit)
> +{
> + set_bit(bit, &ctx->mask_s_mount_flags);
> + set_bit(bit, &ctx->vals_s_mount_flags);
> +}
>
> static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
> {
> @@ -2235,7 +2248,7 @@ static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
> param->key);
> return 0;
> case Opt_abort:
> - ctx_set_mount_flags(ctx, EXT4_MF_FS_ABORTED);
> + ctx_set_mount_flag(ctx, EXT4_MF_FS_ABORTED);
> return 0;
> case Opt_i_version:
> ext4_msg(NULL, KERN_WARNING, deprecated_msg, param->key, "5.20");
