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erofs: enable long extended attribute name prefixes

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Let's enable long xattr name prefix feature.  Old kernels will just
ignore / skip such extended attributes.  In addition, in case you
don't want to mount such images, add another incompatible feature as
an option for this.

Signed-off-by: Jingbo Xu <[email protected]>
Reviewed-by: Gao Xiang <[email protected]>
Acked-by: Chao Yu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Gao Xiang: minor commit message fix. ]
Signed-off-by: Gao Xiang <[email protected]>
This commit is contained in:
Jingbo Xu authored and Gao Xiang committed 2023-04-17 01:15:53 +08:00
1 parent 82bc1ef41d
commit 6a318ccd7e
3 files changed
+11 -1
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fs/erofs/erofs_fs.h
+3 -1
View File
@@ -27,6 +27,7 @@
#define EROFS_FEATURE_INCOMPAT_ZTAILPACKING 0x00000010
#define EROFS_FEATURE_INCOMPAT_FRAGMENTS 0x00000020
#define EROFS_FEATURE_INCOMPAT_DEDUPE 0x00000020
#define EROFS_FEATURE_INCOMPAT_XATTR_PREFIXES 0x00000040
#define EROFS_ALL_FEATURE_INCOMPAT \
(EROFS_FEATURE_INCOMPAT_ZERO_PADDING | \
EROFS_FEATURE_INCOMPAT_COMPR_CFGS | \
@@ -36,7 +37,8 @@
EROFS_FEATURE_INCOMPAT_COMPR_HEAD2 | \
EROFS_FEATURE_INCOMPAT_ZTAILPACKING | \
EROFS_FEATURE_INCOMPAT_FRAGMENTS | \
EROFS_FEATURE_INCOMPAT_DEDUPE)
EROFS_FEATURE_INCOMPAT_DEDUPE | \
EROFS_FEATURE_INCOMPAT_XATTR_PREFIXES)
#define EROFS_SB_EXTSLOT_SIZE 16
fs/erofs/internal.h
+1
View File
@@ -285,6 +285,7 @@ EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)
EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES)
EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
/* atomic flag definitions */
fs/erofs/super.c
+7
View File
@@ -385,6 +385,8 @@ static int erofs_read_superblock(struct super_block *sb)
sbi->meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
#ifdef CONFIG_EROFS_FS_XATTR
sbi->xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
sbi->xattr_prefix_start = le32_to_cpu(dsb->xattr_prefix_start);
sbi->xattr_prefix_count = dsb->xattr_prefix_count;
#endif
sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
sbi->root_nid = le16_to_cpu(dsb->root_nid);
@@ -820,6 +822,10 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
if (err)
return err;
err = erofs_xattr_prefixes_init(sb);
if (err)
return err;
err = erofs_register_sysfs(sb);
if (err)
return err;
@@ -979,6 +985,7 @@ static void erofs_put_super(struct super_block *sb)
erofs_unregister_sysfs(sb);
erofs_shrinker_unregister(sb);
erofs_xattr_prefixes_cleanup(sb);
#ifdef CONFIG_EROFS_FS_ZIP
iput(sbi->managed_cache);
sbi->managed_cache = NULL;