From: Theodore Ts'o Date: Mon, 1 Sep 2014 18:33:09 +0000 (-0400) Subject: ext4: fix accidental flag aliasing in ext4_map_blocks flags X-Git-Tag: firefly_0821_release~176^2~2990^2~55 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=bd30d702fc320085f178d22866b32fdc4736c991;p=firefly-linux-kernel-4.4.55.git ext4: fix accidental flag aliasing in ext4_map_blocks flags Commit b8a8684502a0f introduced an accidental flag aliasing between EXT4_EX_NOCACHE and EXT4_GET_BLOCKS_CONVERT_UNWRITTEN. Fortunately, this didn't introduce any untorward side effects --- we got lucky. Nevertheless, fix this and leave a warning to hopefully avoid this from happening in the future. Signed-off-by: Theodore Ts'o --- diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index cf3ad75d3015..550b4f99a843 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -569,6 +569,7 @@ enum { #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200 /* Convert written extents to unwritten */ #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0400 +/* DO NOT ASSIGN ADDITIONAL FLAG VALUES WITHOUT ADJUSTING THE FLAGS BELOW */ /* * The bit position of these flags must not overlap with any of the @@ -579,8 +580,8 @@ enum { * caching the extents when reading from the extent tree while a * truncate or punch hole operation is in progress. */ -#define EXT4_EX_NOCACHE 0x0400 -#define EXT4_EX_FORCE_CACHE 0x0800 +#define EXT4_EX_NOCACHE 0x0800 +#define EXT4_EX_FORCE_CACHE 0x1000 /* * Flags used by ext4_free_blocks