From: Hongzhen Luo <[email protected]>

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 <[email protected]>
[hongbo: forward port, minor fixes and cleanup]
Signed-off-by: Hongbo Li <[email protected]>
---
 fs/erofs/Kconfig    | 10 ++++++++++
 fs/erofs/erofs_fs.h |  6 ++++--
 fs/erofs/internal.h |  6 ++++++
 fs/erofs/super.c    |  3 ++-
 fs/erofs/xattr.c    | 47 +++++++++++++++++++++++++++++++++++++++++++++
 fs/erofs/xattr.h    |  6 ++++++
 6 files changed, 75 insertions(+), 3 deletions(-)

diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig
index d81f3318417d..ef30cb452244 100644
--- a/fs/erofs/Kconfig
+++ b/fs/erofs/Kconfig
@@ -194,3 +194,13 @@ config EROFS_FS_PCPU_KTHREAD_HIPRI
          at higher priority.
 
          If unsure, say N.
+
+config EROFS_FS_INODE_SHARE
+       bool "EROFS inode page cache share support"
+       depends on EROFS_FS && EROFS_FS_XATTR
+       default n
+       help
+         This permits EROFS to share page cache for files with same
+         fingerprints.
+
+         If unsure, say N.
\ No newline at end of file
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index 3d5738f80072..f6ea8c35db45 100644
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -35,8 +35,9 @@
 #define EROFS_FEATURE_INCOMPAT_XATTR_PREFIXES  0x00000040
 #define EROFS_FEATURE_INCOMPAT_48BIT           0x00000080
 #define EROFS_FEATURE_INCOMPAT_METABOX         0x00000100
+#define EROFS_FEATURE_INCOMPAT_ISHARE_KEY      0x00000200
 #define EROFS_ALL_FEATURE_INCOMPAT             \
-       ((EROFS_FEATURE_INCOMPAT_METABOX << 1) - 1)
+       ((EROFS_FEATURE_INCOMPAT_ISHARE_KEY << 1) - 1)
 
 #define EROFS_SB_EXTSLOT_SIZE  16
 
@@ -86,7 +87,8 @@ struct erofs_super_block {
        __u8 reserved[3];
        __le32 build_time;      /* seconds added to epoch for mkfs time */
        __le64 rootnid_8b;      /* (48BIT on) nid of root directory */
-       __le64 reserved2;
+       __le32 ishare_key_start;        /* start of ishare key */
+       __le32 reserved2;
        __le64 metabox_nid;     /* (METABOX on) nid of the metabox inode */
        __le64 reserved3;       /* [align to extslot 1] */
 };
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index eac067446140..245b9e3897bc 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -167,6 +167,11 @@ struct erofs_sb_info {
        struct erofs_domain *domain;
        char *fsid;
        char *domain_id;
+
+       /* inode page cache share support */
+       u32 ishare_key_start;
+       int ishare_key_idx;
+       char *ishare_key;
 };
 
 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
@@ -232,6 +237,7 @@ EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
 EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES)
 EROFS_FEATURE_FUNCS(48bit, incompat, INCOMPAT_48BIT)
 EROFS_FEATURE_FUNCS(metabox, incompat, INCOMPAT_METABOX)
+EROFS_FEATURE_FUNCS(ishare_key, incompat, INCOMPAT_ISHARE_KEY)
 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)
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index f9d8f978bf81..283449024996 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -339,7 +339,7 @@ static int erofs_read_superblock(struct super_block *sb)
                        return -EFSCORRUPTED;   /* self-loop detection */
        }
        sbi->inos = le64_to_cpu(dsb->inos);
-
+       sbi->ishare_key_start = le32_to_cpu(dsb->ishare_key_start);
        sbi->epoch = (s64)le64_to_cpu(dsb->epoch);
        sbi->fixed_nsec = le32_to_cpu(dsb->fixed_nsec);
        super_set_uuid(sb, (void *)dsb->uuid, sizeof(dsb->uuid));
@@ -738,6 +738,7 @@ static int erofs_fc_fill_super(struct super_block *sb, 
struct fs_context *fc)
        if (err)
                return err;
 
+       erofs_xattr_set_ishare_key(sb);
        erofs_set_sysfs_name(sb);
        err = erofs_register_sysfs(sb);
        if (err)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 396536d9a862..6610c007ee4c 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -564,3 +564,50 @@ struct posix_acl *erofs_get_acl(struct inode *inode, int 
type, bool rcu)
        return acl;
 }
 #endif
+
+#ifdef CONFIG_EROFS_FS_INODE_SHARE
+void erofs_xattr_set_ishare_key(struct super_block *sb)
+{
+       struct erofs_sb_info *sbi = EROFS_SB(sb);
+       struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
+       struct xattr_handler const *handler;
+       erofs_off_t pos;
+       char *key;
+       int len, i;
+       void *ptr;
+
+       if (!erofs_sb_has_fragments(sbi) || !erofs_sb_has_ishare_key(sbi) ||
+           !sbi->packed_inode)
+               return;
+
+       buf.mapping = sbi->packed_inode->i_mapping;
+       pos = sbi->ishare_key_start << 2;
+       (void)erofs_init_metabuf(&buf, sb, false);
+       ptr = erofs_read_metadata(sb, &buf, &pos, &len);
+
+       if (IS_ERR(ptr))
+               goto out;
+
+       for (i = 0; ARRAY_SIZE(erofs_xattr_handlers) - 1; i++) {
+               handler = erofs_xattr_handlers[i];
+               if (!handler)
+                       break;
+               if (!memcmp(handler->prefix, ptr, strlen(handler->prefix)))
+                       break;
+       }
+
+       if (!handler)
+               goto out;
+
+       len -= strlen(handler->prefix);
+       key = kzalloc(len + 1, GFP_KERNEL);
+       if (!key)
+               goto out;
+
+       memcpy(key, ptr + strlen(handler->prefix), len);
+       sbi->ishare_key = key;
+       sbi->ishare_key_idx = handler->flags;
+out:
+       erofs_put_metabuf(&buf);
+}
+#endif
diff --git a/fs/erofs/xattr.h b/fs/erofs/xattr.h
index 6317caa8413e..99c4674cfd51 100644
--- a/fs/erofs/xattr.h
+++ b/fs/erofs/xattr.h
@@ -67,4 +67,10 @@ struct posix_acl *erofs_get_acl(struct inode *inode, int 
type, bool rcu);
 #define erofs_get_acl  (NULL)
 #endif
 
+#ifdef CONFIG_EROFS_FS_INODE_SHARE
+void erofs_xattr_set_ishare_key(struct super_block *sb);
+#else
+static inline void erofs_xattr_set_ishare_key(struct super_block *sb) {}
+#endif
+
 #endif
-- 
2.22.0


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