Each extent_map will end up with a pointer to its associated fscrypt_info if any, which should have the same lifetime as the extent_map. Add creation of fscrypt_infos for new extent_maps, and freeing as appropriate. Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@xxxxxxxxxx> --- fs/btrfs/extent_map.c | 8 ++++++++ fs/btrfs/extent_map.h | 3 +++ fs/btrfs/inode.c | 8 ++++++++ 3 files changed, 19 insertions(+) diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c index 0cdb3e86f29b..4fa5f97559da 100644 --- a/fs/btrfs/extent_map.c +++ b/fs/btrfs/extent_map.c @@ -65,6 +65,8 @@ void free_extent_map(struct extent_map *em) if (!em) return; if (refcount_dec_and_test(&em->refs)) { + if (em->fscrypt_info) + fscrypt_free_extent_info(&em->fscrypt_info); WARN_ON(extent_map_in_tree(em)); WARN_ON(!list_empty(&em->list)); if (test_bit(EXTENT_FLAG_FS_MAPPING, &em->flags)) @@ -207,6 +209,12 @@ static int mergable_maps(struct extent_map *prev, struct extent_map *next) if (!list_empty(&prev->list) || !list_empty(&next->list)) return 0; + /* + * Don't merge adjacent encrypted maps. + */ + if (prev->fscrypt_info || next->fscrypt_info) + return 0; + ASSERT(next->block_start != EXTENT_MAP_DELALLOC && prev->block_start != EXTENT_MAP_DELALLOC); diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h index 35d27c756e08..3a1b66b1cedf 100644 --- a/fs/btrfs/extent_map.h +++ b/fs/btrfs/extent_map.h @@ -27,6 +27,8 @@ enum { EXTENT_FLAG_FS_MAPPING, /* This em is merged from two or more physically adjacent ems */ EXTENT_FLAG_MERGED, + /* This em has a fscrypt info */ + EXTENT_FLAG_ENCRYPTED, }; struct extent_map { @@ -50,6 +52,7 @@ struct extent_map { */ u64 generation; unsigned long flags; + struct fscrypt_info *fscrypt_info; /* Used for chunk mappings, flag EXTENT_FLAG_FS_MAPPING must be set */ struct map_lookup *map_lookup; refcount_t refs; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 40c2ec328730..b43fc253ecd1 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7460,6 +7460,14 @@ static struct extent_map *create_io_em(struct btrfs_inode *inode, u64 start, em->compress_type = compress_type; } + ret = fscrypt_prepare_new_extent(&inode->vfs_inode, &em->fscrypt_info); + if (ret < 0) { + free_extent_map(em); + return ERR_PTR(ret); + } + if (em->fscrypt_info) + set_bit(EXTENT_FLAG_ENCRYPTED, &em->flags); + ret = btrfs_replace_extent_map_range(inode, em, true); if (ret) { free_extent_map(em); -- 2.40.1
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