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scoutfs-utils: support single dirent format

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Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2018-04-04 09:15:54 -05:00
committed by Mark Swan
parent 787555158a
commit 0770cc8c57
5 changed files with 104 additions and 128 deletions
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utils/src/format.h
+12 -25
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@@ -266,29 +266,13 @@ struct scoutfs_inode_key {
__u8 type;
} __packed;
/* value is struct scoutfs_dirent without the name */
/* value is struct scoutfs_dirent with the name */
struct scoutfs_dirent_key {
__u8 zone;
__be64 ino;
__u8 type;
__u8 name[0];
} __packed;
/* value is struct scoutfs_dirent with the name */
struct scoutfs_readdir_key {
__u8 zone;
__be64 ino;
__u8 type;
__be64 pos;
} __packed;
/* value is empty */
struct scoutfs_link_backref_key {
__u8 zone;
__be64 ino;
__u8 type;
__be64 dir_ino;
__u8 name[0];
__be64 major;
__be64 minor;
} __packed;
/* key is bytes of encoded block mapping */
@@ -494,13 +478,17 @@ struct scoutfs_inode {
#define SCOUTFS_SYMLINK_MAX_SIZE 4096
/*
* Dirents are stored in items with an offset of the hash of their name.
* Colliding names are packed into the value.
* Dirents are stored in multiple places to isolate contention when
* performing different operations: hashed by name for creation and
* lookup, at incrementing positions for readdir and resolving inodes to
* paths. Each entry has all the metadata needed to reference all the
* items (so an entry cached by lookup can be used to unlink all the
* items).
*/
struct scoutfs_dirent {
__le64 ino;
__le64 counter;
__le64 readdir_pos;
__le64 hash;
__le64 pos;
__u8 type;
__u8 name[0];
} __packed;
@@ -526,9 +514,8 @@ enum {
SCOUTFS_DT_WHT,
};
/* ino_path can search for backref items with a null term */
#define SCOUTFS_MAX_KEY_SIZE \
offsetof(struct scoutfs_link_backref_key, name[SCOUTFS_NAME_LEN + 1])
sizeof(struct scoutfs_dirent_key)
#define SCOUTFS_MAX_VAL_SIZE SCOUTFS_BLOCK_MAPPING_MAX_BYTES