diff options
Diffstat (limited to 'include/linux/gfs2_ondisk.h')
| -rw-r--r-- | include/linux/gfs2_ondisk.h | 58 |
1 files changed, 28 insertions, 30 deletions
diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h index c56b4bce56d0..4f4462974c14 100644 --- a/include/linux/gfs2_ondisk.h +++ b/include/linux/gfs2_ondisk.h @@ -81,7 +81,11 @@ struct gfs2_meta_header { __be32 mh_type; __be64 __pad0; /* Was generation number in gfs1 */ __be32 mh_format; - __be32 __pad1; /* Was incarnation number in gfs1 */ + /* This union is to keep userspace happy */ + union { + __be32 mh_jid; /* Was incarnation number in gfs1 */ + __be32 __pad1; + }; }; /* @@ -176,33 +180,6 @@ struct gfs2_rgrp { }; /* - * quota linked list: user quotas and group quotas form two separate - * singly linked lists. ll_next stores uids or gids of next quotas in the - * linked list. - -Given the uid/gid, how to calculate the quota file offsets for the corresponding -gfs2_quota structures on disk: - -for user quotas, given uid, -offset = uid * sizeof(struct gfs2_quota); - -for group quotas, given gid, -offset = (gid * sizeof(struct gfs2_quota)) + sizeof(struct gfs2_quota); - - - uid:0 gid:0 uid:12 gid:12 uid:17 gid:17 uid:5142 gid:5142 -+-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+ -| valid | valid | :: | valid | valid | :: | valid | inval | :: | inval | valid | -+-------+-------+ +-------+-------+ +-------+- - - -+ +- - - -+-------+ -next:12 next:12 next:17 next:5142 next:NULL next:NULL - | | | | |<-- user quota list | - \______|___________/ \______|___________/ group quota list -->| - | | | - \__________________/ \_______________________________________/ - -*/ - -/* * quota structure */ @@ -210,8 +187,7 @@ struct gfs2_quota { __be64 qu_limit; __be64 qu_warn; __be64 qu_value; - __be32 qu_ll_next; /* location of next quota in list */ - __u8 qu_reserved[60]; + __u8 qu_reserved[64]; }; /* @@ -333,6 +309,28 @@ struct gfs2_leaf { /* * Extended attribute header format + * + * This works in a similar way to dirents. There is a fixed size header + * followed by a variable length section made up of the name and the + * associated data. In the case of a "stuffed" entry, the value is + * inline directly after the name, the ea_num_ptrs entry will be + * zero in that case. For non-"stuffed" entries, there will be + * a set of pointers (aligned to 8 byte boundary) to the block(s) + * containing the value. + * + * The blocks containing the values and the blocks containing the + * extended attribute headers themselves all start with the common + * metadata header. Each inode, if it has extended attributes, will + * have either a single block containing the extended attribute headers + * or a single indirect block pointing to blocks containing the + * extended attribure headers. + * + * The maximim size of the data part of an extended attribute is 64k + * so the number of blocks required depends upon block size. Since the + * block size also determines the number of pointers in an indirect + * block, its a fairly complicated calculation to work out the maximum + * number of blocks that an inode may have relating to extended attributes. + * */ #define GFS2_EA_MAX_NAME_LEN 255 |