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erofs: use feature_incompat rather than requirements 

As Christoph said [1], "This is only cosmetic, why
not stick to feature_compat and feature_incompat?"

In my thought, requirements means "incompatible"
instead of "feature" though.

[1] https://lore.kernel.org/r/20190902125109.GA9826@infradead.org/
Reported-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190904020912.63925-7-gaoxiang25@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2019-09-04 10:08:53 +08:00 committed by Greg Kroah-Hartman
parent c39747f770
commit 426a930891
4 changed files with 14 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/erofs/decompressor.c
View File

@ -129,7 +129,8 @@ static int lz4_decompress(struct z_erofs_decompress_req *rq, u8 *out)
support_0padding = false;
/* decompression inplace is only safe when 0padding is enabled */
if (EROFS_SB(rq->sb)->requirements & EROFS_REQUIREMENT_LZ4_0PADDING) {
if (EROFS_SB(rq->sb)->feature_incompat &
EROFS_FEATURE_INCOMPAT_LZ4_0PADDING) {
support_0padding = true;
while (!src[inputmargin & ~PAGE_MASK])

12
fs/erofs/erofs_fs.h
View File

@ -11,17 +11,17 @@
#define EROFS_SUPER_OFFSET 1024
/*
* Any bits that aren't in EROFS_ALL_REQUIREMENTS should be
* incompatible with this kernel version.
* Any bits that aren't in EROFS_ALL_FEATURE_INCOMPAT should
* be incompatible with this kernel version.
*/
#define EROFS_REQUIREMENT_LZ4_0PADDING 0x00000001
#define EROFS_ALL_REQUIREMENTS EROFS_REQUIREMENT_LZ4_0PADDING
#define EROFS_FEATURE_INCOMPAT_LZ4_0PADDING 0x00000001
#define EROFS_ALL_FEATURE_INCOMPAT EROFS_FEATURE_INCOMPAT_LZ4_0PADDING
/* 128-byte erofs on-disk super block */
struct erofs_super_block {
__le32 magic; /* file system magic number */
__le32 checksum; /* crc32c(super_block) */
__le32 features; /* (aka. feature_compat) */
__le32 feature_compat;
__u8 blkszbits; /* support block_size == PAGE_SIZE only */
__u8 reserved;
@ -35,7 +35,7 @@ struct erofs_super_block {
__le32 xattr_blkaddr; /* start block address of shared xattr area */
__u8 uuid[16]; /* 128-bit uuid for volume */
__u8 volume_name[16]; /* volume name */
__le32 requirements; /* (aka. feature_incompat) */
__le32 feature_incompat;
__u8 reserved2[44];
};

2
fs/erofs/internal.h
View File

@ -96,7 +96,7 @@ struct erofs_sb_info {
u8 uuid[16]; /* 128-bit uuid for volume */
u8 volume_name[16]; /* volume name */
u32 requirements;
u32 feature_incompat;
unsigned int mount_opt;

10
fs/erofs/super.c
View File

@ -67,14 +67,14 @@ static void free_inode(struct inode *inode)
static bool check_layout_compatibility(struct super_block *sb,
struct erofs_super_block *layout)
{
const unsigned int requirements = le32_to_cpu(layout->requirements);
const unsigned int feature = le32_to_cpu(layout->feature_incompat);
EROFS_SB(sb)->requirements = requirements;
EROFS_SB(sb)->feature_incompat = feature;
/* check if current kernel meets all mandatory requirements */
if (requirements & (~EROFS_ALL_REQUIREMENTS)) {
errln("unidentified requirements %x, please upgrade kernel version",
requirements & ~EROFS_ALL_REQUIREMENTS);
if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
errln("unidentified incompatible feature %x, please upgrade kernel version",
feature & ~EROFS_ALL_FEATURE_INCOMPAT);
return false;
}
return true;