Code to support CXL Dynamic Capacity devices will have extent ranges which need to be compared for intersection not a subset as is being checked in range_contains(). range_overlaps() is defined in btrfs with a different meaning from what is required in the standard range code. Dan Williams pointed this out in [1]. Adjust the btrfs call according to his suggestion there. Then add a generic range_overlaps(). Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Cc: Chris Mason <clm@xxxxxx> Cc: Josef Bacik <josef@xxxxxxxxxxxxxx> Cc: David Sterba <dsterba@xxxxxxxx> Cc: linux-btrfs@xxxxxxxxxxxxxxx Link: https://lore.kernel.org/all/65949f79ef908_8dc68294f2@xxxxxxxxxxxxxxxxxxxxxxxxx.notmuch/ [1] Acked-by: David Sterba <dsterba@xxxxxxxx> Reviewed-by: Davidlohr Bueso <dave@xxxxxxxxxxxx> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx> Reviewed-by: Fan Ni <fan.ni@xxxxxxxxxxx> Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> --- fs/btrfs/ordered-data.c | 10 +++++----- include/linux/range.h | 8 ++++++++ 2 files changed, 13 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index 2104d60c216166d577ef81750c63167248f33b6a..744c3375ee6a88e0fc01ef7664e923a48cbe6dca 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -111,8 +111,8 @@ static struct rb_node *__tree_search(struct rb_root *root, u64 file_offset, return NULL; } -static int range_overlaps(struct btrfs_ordered_extent *entry, u64 file_offset, - u64 len) +static int btrfs_range_overlaps(struct btrfs_ordered_extent *entry, u64 file_offset, + u64 len) { if (file_offset + len <= entry->file_offset || entry->file_offset + entry->num_bytes <= file_offset) @@ -985,7 +985,7 @@ struct btrfs_ordered_extent *btrfs_lookup_ordered_range( while (1) { entry = rb_entry(node, struct btrfs_ordered_extent, rb_node); - if (range_overlaps(entry, file_offset, len)) + if (btrfs_range_overlaps(entry, file_offset, len)) break; if (entry->file_offset >= file_offset + len) { @@ -1114,12 +1114,12 @@ struct btrfs_ordered_extent *btrfs_lookup_first_ordered_range( } if (prev) { entry = rb_entry(prev, struct btrfs_ordered_extent, rb_node); - if (range_overlaps(entry, file_offset, len)) + if (btrfs_range_overlaps(entry, file_offset, len)) goto out; } if (next) { entry = rb_entry(next, struct btrfs_ordered_extent, rb_node); - if (range_overlaps(entry, file_offset, len)) + if (btrfs_range_overlaps(entry, file_offset, len)) goto out; } /* No ordered extent in the range */ diff --git a/include/linux/range.h b/include/linux/range.h index 6ad0b73cb7adc0ee53451b8fed0a70772adc98fa..876cd5355158eff267a42991ba17fa35a1d31600 100644 --- a/include/linux/range.h +++ b/include/linux/range.h @@ -13,11 +13,19 @@ static inline u64 range_len(const struct range *range) return range->end - range->start + 1; } +/* True if r1 completely contains r2 */ static inline bool range_contains(struct range *r1, struct range *r2) { return r1->start <= r2->start && r1->end >= r2->end; } +/* True if any part of r1 overlaps r2 */ +static inline bool range_overlaps(const struct range *r1, + const struct range *r2) +{ + return r1->start <= r2->end && r1->end >= r2->start; +} + int add_range(struct range *range, int az, int nr_range, u64 start, u64 end); -- 2.47.0
