From 1972708a897e99b25cd7d246bd37d44a592c4b54 Mon Sep 17 00:00:00 2001 From: Dennis Zhou Date: Mon, 4 Feb 2019 15:19:57 -0500 Subject: [PATCH] btrfs: add helpers for compression type and level It is very easy to miss places that rely on a certain bitshifting for decoding the type_level overloading. Add helpers to do this instead. Cc: Omar Sandoval Reviewed-by: Nikolay Borisov Reviewed-by: Josef Bacik Signed-off-by: Dennis Zhou Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/compression.c | 2 +- fs/btrfs/compression.h | 10 ++++++++++ fs/btrfs/zlib.c | 2 +- 3 files changed, 12 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 548057630b69..94a0b0a3a301 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -1036,9 +1036,9 @@ int btrfs_compress_pages(unsigned int type_level, struct address_space *mapping, unsigned long *total_in, unsigned long *total_out) { + int type = btrfs_compress_type(type_level); struct list_head *workspace; int ret; - int type = type_level & 0xF; workspace = find_workspace(type); diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h index ddda9b80bf20..004db0b3111b 100644 --- a/fs/btrfs/compression.h +++ b/fs/btrfs/compression.h @@ -64,6 +64,16 @@ struct compressed_bio { u32 sums; }; +static inline unsigned int btrfs_compress_type(unsigned int type_level) +{ + return (type_level & 0xF); +} + +static inline unsigned int btrfs_compress_level(unsigned int type_level) +{ + return ((type_level & 0xF0) >> 4); +} + void __init btrfs_init_compress(void); void __cold btrfs_exit_compress(void); diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c index 970ff3e35bb3..2bd655c4f8b4 100644 --- a/fs/btrfs/zlib.c +++ b/fs/btrfs/zlib.c @@ -393,7 +393,7 @@ static int zlib_decompress(struct list_head *ws, unsigned char *data_in, static void zlib_set_level(struct list_head *ws, unsigned int type) { struct workspace *workspace = list_entry(ws, struct workspace, list); - unsigned level = (type & 0xF0) >> 4; + unsigned int level = btrfs_compress_level(type); if (level > 9) level = 9; -- GitLab