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erofs: support user-defined fingerprint name

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When creating the EROFS image, users can specify the fingerprint name.
This is to prepare for the upcoming inode page cache share.

Signed-off-by: Hongzhen Luo <hongzhen@linux.alibaba.com>
Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Hongzhen Luo 2026-01-23 01:31:25 +00:00 committed by Gao Xiang
parent 4340ca47c3
commit e0bf7d1c07
5 changed files with 36 additions and 2 deletions
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9
fs/erofs/Kconfig
View File

@ -194,3 +194,12 @@ config EROFS_FS_PCPU_KTHREAD_HIPRI
at higher priority.
If unsure, say N.
config EROFS_FS_PAGE_CACHE_SHARE
bool "EROFS page cache share support (experimental)"
depends on EROFS_FS && EROFS_FS_XATTR && !EROFS_FS_ONDEMAND
help
This enables page cache sharing among inodes with identical
content fingerprints on the same machine.
If unsure, say N.

5
fs/erofs/erofs_fs.h
View File

@ -17,7 +17,7 @@
#define EROFS_FEATURE_COMPAT_XATTR_FILTER 0x00000004
#define EROFS_FEATURE_COMPAT_SHARED_EA_IN_METABOX 0x00000008
#define EROFS_FEATURE_COMPAT_PLAIN_XATTR_PFX 0x00000010
#define EROFS_FEATURE_COMPAT_ISHARE_XATTRS 0x00000020
/*
* Any bits that aren't in EROFS_ALL_FEATURE_INCOMPAT should
@ -83,7 +83,8 @@ struct erofs_super_block {
__le32 xattr_prefix_start; /* start of long xattr prefixes */
__le64 packed_nid; /* nid of the special packed inode */
__u8 xattr_filter_reserved; /* reserved for xattr name filter */
__u8 reserved[3];
__u8 ishare_xattr_prefix_id;
__u8 reserved[2];
__le32 build_time; /* seconds added to epoch for mkfs time */
__le64 rootnid_8b; /* (48BIT on) nid of root directory */
__le64 reserved2;

2
fs/erofs/internal.h
View File

@ -131,6 +131,7 @@ struct erofs_sb_info {
u32 xattr_blkaddr;
u32 xattr_prefix_start;
u8 xattr_prefix_count;
u8 ishare_xattr_prefix_id;
struct erofs_xattr_prefix_item *xattr_prefixes;
unsigned int xattr_filter_reserved;
#endif
@ -235,6 +236,7 @@ EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER)
EROFS_FEATURE_FUNCS(shared_ea_in_metabox, compat, COMPAT_SHARED_EA_IN_METABOX)
EROFS_FEATURE_FUNCS(plain_xattr_pfx, compat, COMPAT_PLAIN_XATTR_PFX)
EROFS_FEATURE_FUNCS(ishare_xattrs, compat, COMPAT_ISHARE_XATTRS)
static inline u64 erofs_nid_to_ino64(struct erofs_sb_info *sbi, erofs_nid_t nid)
{

9
fs/erofs/super.c
View File

@ -320,6 +320,15 @@ static int erofs_read_superblock(struct super_block *sb)
sbi->xattr_prefix_start = le32_to_cpu(dsb->xattr_prefix_start);
sbi->xattr_prefix_count = dsb->xattr_prefix_count;
sbi->xattr_filter_reserved = dsb->xattr_filter_reserved;
if (erofs_sb_has_ishare_xattrs(sbi)) {
if (dsb->ishare_xattr_prefix_id >= sbi->xattr_prefix_count) {
erofs_err(sb, "invalid ishare xattr prefix id %u",
dsb->ishare_xattr_prefix_id);
ret = -EFSCORRUPTED;
goto out;
}
sbi->ishare_xattr_prefix_id = dsb->ishare_xattr_prefix_id;
}
#endif
sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
if (erofs_sb_has_48bit(sbi) && dsb->rootnid_8b) {

13
fs/erofs/xattr.c
View File

@ -530,6 +530,19 @@ int erofs_xattr_prefixes_init(struct super_block *sb)
}
erofs_put_metabuf(&buf);
if (!ret && erofs_sb_has_ishare_xattrs(sbi)) {
struct erofs_xattr_prefix_item *pf = pfs + sbi->ishare_xattr_prefix_id;
struct erofs_xattr_long_prefix *newpfx;
newpfx = krealloc(pf->prefix,
sizeof(*newpfx) + pf->infix_len + 1, GFP_KERNEL);
if (newpfx) {
newpfx->infix[pf->infix_len] = '\0';
pf->prefix = newpfx;
} else {
ret = -ENOMEM;
}
}
sbi->xattr_prefixes = pfs;
if (ret)
erofs_xattr_prefixes_cleanup(sb);