| Message ID | 20240813123452.2824659-11-yi.zhang@huaweicloud.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | ext4: simplify the counting and management of delalloc reserved blocks | expand |
On Tue 13-08-24 20:34:50, Zhang Yi wrote: > From: Zhang Yi <yi.zhang@huawei.com> > > Since we don't add delayed flag in unwritten extents, all of the four > extent status types EXTENT_STATUS_WRITTEN, EXTENT_STATUS_UNWRITTEN, > EXTENT_STATUS_DELAYED and EXTENT_STATUS_HOLE are exclusive now, add > assertion when storing pblock before inserting extent into status tree > and add comment to the status definition. > > Suggested-by: Jan Kara <jack@suse.cz> > Signed-off-by: Zhang Yi <yi.zhang@huawei.com> Looks good. Feel free to add: Reviewed-by: Jan Kara <jack@suse.cz> Honza > --- > fs/ext4/extents_status.h | 12 ++++++++++-- > 1 file changed, 10 insertions(+), 2 deletions(-) > > diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h > index 3ca40f018994..7d7af642f7b2 100644 > --- a/fs/ext4/extents_status.h > +++ b/fs/ext4/extents_status.h > @@ -42,6 +42,10 @@ enum { > #define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS) > #define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT) > > +/* > + * Besides EXTENT_STATUS_REFERENCED, all these extent type masks > + * are exclusive, only one type can be set at a time. > + */ > #define EXTENT_STATUS_WRITTEN (1 << ES_WRITTEN_B) > #define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B) > #define EXTENT_STATUS_DELAYED (1 << ES_DELAYED_B) > @@ -51,7 +55,9 @@ enum { > #define ES_TYPE_MASK ((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \ > EXTENT_STATUS_UNWRITTEN | \ > EXTENT_STATUS_DELAYED | \ > - EXTENT_STATUS_HOLE) << ES_SHIFT) > + EXTENT_STATUS_HOLE)) > + > +#define ES_TYPE_VALID(type) ((type) && !((type) & ((type) - 1))) > > struct ext4_sb_info; > struct ext4_extent; > @@ -156,7 +162,7 @@ static inline unsigned int ext4_es_status(struct extent_status *es) > > static inline unsigned int ext4_es_type(struct extent_status *es) > { > - return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT; > + return (es->es_pblk >> ES_SHIFT) & ES_TYPE_MASK; > } > > static inline int ext4_es_is_written(struct extent_status *es) > @@ -228,6 +234,8 @@ static inline void ext4_es_store_pblock_status(struct extent_status *es, > ext4_fsblk_t pb, > unsigned int status) > { > + WARN_ON_ONCE(!ES_TYPE_VALID(status & ES_TYPE_MASK)); > + > es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) | > (pb & ~ES_MASK); > } > -- > 2.39.2 >
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h index 3ca40f018994..7d7af642f7b2 100644 --- a/fs/ext4/extents_status.h +++ b/fs/ext4/extents_status.h @@ -42,6 +42,10 @@ enum { #define ES_SHIFT (sizeof(ext4_fsblk_t)*8 - ES_FLAGS) #define ES_MASK (~((ext4_fsblk_t)0) << ES_SHIFT) +/* + * Besides EXTENT_STATUS_REFERENCED, all these extent type masks + * are exclusive, only one type can be set at a time. + */ #define EXTENT_STATUS_WRITTEN (1 << ES_WRITTEN_B) #define EXTENT_STATUS_UNWRITTEN (1 << ES_UNWRITTEN_B) #define EXTENT_STATUS_DELAYED (1 << ES_DELAYED_B) @@ -51,7 +55,9 @@ enum { #define ES_TYPE_MASK ((ext4_fsblk_t)(EXTENT_STATUS_WRITTEN | \ EXTENT_STATUS_UNWRITTEN | \ EXTENT_STATUS_DELAYED | \ - EXTENT_STATUS_HOLE) << ES_SHIFT) + EXTENT_STATUS_HOLE)) + +#define ES_TYPE_VALID(type) ((type) && !((type) & ((type) - 1))) struct ext4_sb_info; struct ext4_extent; @@ -156,7 +162,7 @@ static inline unsigned int ext4_es_status(struct extent_status *es) static inline unsigned int ext4_es_type(struct extent_status *es) { - return (es->es_pblk & ES_TYPE_MASK) >> ES_SHIFT; + return (es->es_pblk >> ES_SHIFT) & ES_TYPE_MASK; } static inline int ext4_es_is_written(struct extent_status *es) @@ -228,6 +234,8 @@ static inline void ext4_es_store_pblock_status(struct extent_status *es, ext4_fsblk_t pb, unsigned int status) { + WARN_ON_ONCE(!ES_TYPE_VALID(status & ES_TYPE_MASK)); + es->es_pblk = (((ext4_fsblk_t)status << ES_SHIFT) & ES_MASK) | (pb & ~ES_MASK); }