diff options
Diffstat (limited to 'fs/exofs/common.h')
| -rw-r--r-- | fs/exofs/common.h | 63 |
1 files changed, 57 insertions, 6 deletions
diff --git a/fs/exofs/common.h b/fs/exofs/common.h index ce1c7169259..b1b178e6171 100644 --- a/fs/exofs/common.h +++ b/fs/exofs/common.h @@ -49,6 +49,7 @@ #define EXOFS_MIN_PID 0x10000 /* Smallest partition ID */ #define EXOFS_OBJ_OFF 0x10000 /* offset for objects */ #define EXOFS_SUPER_ID 0x10000 /* object ID for on-disk superblock */ +#define EXOFS_DEVTABLE_ID 0x10001 /* object ID for on-disk device table */ #define EXOFS_ROOT_ID 0x10002 /* object ID for root directory */ /* exofs Application specific page/attribute */ @@ -78,17 +79,67 @@ enum { #define EXOFS_SUPER_MAGIC 0x5DF5 /* - * The file system control block - stored in an object's data (mainly, the one - * with ID EXOFS_SUPER_ID). This is where the in-memory superblock is stored - * on disk. Right now it just has a magic value, which is basically a sanity - * check on our ability to communicate with the object store. + * The file system control block - stored in object EXOFS_SUPER_ID's data. + * This is where the in-memory superblock is stored on disk. */ +enum {EXOFS_FSCB_VER = 1, EXOFS_DT_VER = 1}; struct exofs_fscb { __le64 s_nextid; /* Highest object ID used */ - __le32 s_numfiles; /* Number of files on fs */ + __le64 s_numfiles; /* Number of files on fs */ + __le32 s_version; /* == EXOFS_FSCB_VER */ __le16 s_magic; /* Magic signature */ __le16 s_newfs; /* Non-zero if this is a new fs */ -}; + + /* From here on it's a static part, only written by mkexofs */ + __le64 s_dev_table_oid; /* Resurved, not used */ + __le64 s_dev_table_count; /* == 0 means no dev_table */ +} __packed; + +/* + * Describes the raid used in the FS. It is part of the device table. + * This here is taken from the pNFS-objects definition. In exofs we + * use one raid policy through-out the filesystem. (NOTE: the funny + * alignment at begining. We take care of it at exofs_device_table. + */ +struct exofs_dt_data_map { + __le32 cb_num_comps; + __le64 cb_stripe_unit; + __le32 cb_group_width; + __le32 cb_group_depth; + __le32 cb_mirror_cnt; + __le32 cb_raid_algorithm; +} __packed; + +/* + * This is an osd device information descriptor. It is a single entry in + * the exofs device table. It describes an osd target lun which + * contains data belonging to this FS. (Same partition_id on all devices) + */ +struct exofs_dt_device_info { + __le32 systemid_len; + u8 systemid[OSD_SYSTEMID_LEN]; + __le64 long_name_offset; /* If !0 then offset-in-file */ + __le32 osdname_len; /* */ + u8 osdname[44]; /* Embbeded, Ususally an asci uuid */ +} __packed; + +/* + * The EXOFS device table - stored in object EXOFS_DEVTABLE_ID's data. + * It contains the raid used for this multy-device FS and an array of + * participating devices. + */ +struct exofs_device_table { + __le32 dt_version; /* == EXOFS_DT_VER */ + struct exofs_dt_data_map dt_data_map; /* Raid policy to use */ + + /* Resurved space For future use. Total includeing this: + * (8 * sizeof(le64)) + */ + __le64 __Resurved[4]; + + __le64 dt_num_devices; /* Array size */ + struct exofs_dt_device_info dt_dev_table[]; /* Array of devices */ +} __packed; /**************************************************************************** * inode-related things |