^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 1) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 2) * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 3) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) #include <linux/string.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) #include <linux/time.h>
8da4b8c48e7b4 (Andy Shevchenko 2016-05-20 17:01:00 -0700 7) #include <linux/uuid.h>
f466c6fdb3b1f (Al Viro 2012-03-17 01:16:43 -0400 8) #include "reiserfs.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9)
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 10) /* find where objectid map starts */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11) #define objectid_map(s,rs) (old_format_only (s) ? \
3e8962be915ba (Al Viro 2005-05-01 08:59:18 -0700 12) (__le32 *)((struct reiserfs_super_block_v1 *)(rs) + 1) :\
3e8962be915ba (Al Viro 2005-05-01 08:59:18 -0700 13) (__le32 *)((rs) + 1))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15) #ifdef CONFIG_REISERFS_CHECK
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 17) static void check_objectid_map(struct super_block *s, __le32 * map)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 19) if (le32_to_cpu(map[0]) != 1)
c3a9c2109f848 (Jeff Mahoney 2009-03-30 14:02:25 -0400 20) reiserfs_panic(s, "vs-15010", "map corrupted: %lx",
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 21) (long unsigned int)le32_to_cpu(map[0]));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22)
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 23) /* FIXME: add something else here */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 25)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 26) #else
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 27) static void check_objectid_map(struct super_block *s, __le32 * map)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 28) {;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 29) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 30) #endif
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31)
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 32) /*
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 33) * When we allocate objectids we allocate the first unused objectid.
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 34) * Each sequence of objectids in use (the odd sequences) is followed
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 35) * by a sequence of objectids not in use (the even sequences). We
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 36) * only need to record the last objectid in each of these sequences
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 37) * (both the odd and even sequences) in order to fully define the
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 38) * boundaries of the sequences. A consequence of allocating the first
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 39) * objectid not in use is that under most conditions this scheme is
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 40) * extremely compact. The exception is immediately after a sequence
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 41) * of operations which deletes a large number of objects of
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 42) * non-sequential objectids, and even then it will become compact
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 43) * again as soon as more objects are created. Note that many
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 44) * interesting optimizations of layout could result from complicating
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 45) * objectid assignment, but we have deferred making them for now.
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 46) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 47)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 48) /* get unique object identifier */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 49) __u32 reiserfs_get_unused_objectid(struct reiserfs_transaction_handle *th)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 50) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 51) struct super_block *s = th->t_super;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 52) struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 53) __le32 *map = objectid_map(s, rs);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 54) __u32 unused_objectid;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 55)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 56) BUG_ON(!th->t_trans_id);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 57)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 58) check_objectid_map(s, map);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 59)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 60) reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 61) /* comment needed -Hans */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 62) unused_objectid = le32_to_cpu(map[1]);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 63) if (unused_objectid == U32_MAX) {
45b03d5e8e674 (Jeff Mahoney 2009-03-30 14:02:21 -0400 64) reiserfs_warning(s, "reiserfs-15100", "no more object ids");
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 65) reiserfs_restore_prepared_buffer(s, SB_BUFFER_WITH_SB(s));
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 66) return 0;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 67) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 68)
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 69) /*
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 70) * This incrementation allocates the first unused objectid. That
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 71) * is to say, the first entry on the objectid map is the first
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 72) * unused objectid, and by incrementing it we use it. See below
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 73) * where we check to see if we eliminated a sequence of unused
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 74) * objectids....
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 75) */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 76) map[1] = cpu_to_le32(unused_objectid + 1);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 77)
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 78) /*
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 79) * Now we check to see if we eliminated the last remaining member of
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 80) * the first even sequence (and can eliminate the sequence by
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 81) * eliminating its last objectid from oids), and can collapse the
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 82) * first two odd sequences into one sequence. If so, then the net
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 83) * result is to eliminate a pair of objectids from oids. We do this
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 84) * by shifting the entire map to the left.
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 85) */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 86) if (sb_oid_cursize(rs) > 2 && map[1] == map[2]) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 87) memmove(map + 1, map + 3,
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 88) (sb_oid_cursize(rs) - 3) * sizeof(__u32));
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 89) set_sb_oid_cursize(rs, sb_oid_cursize(rs) - 2);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 90) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 91)
09f1b80ba8c96 (Jeff Mahoney 2014-04-23 10:00:39 -0400 92) journal_mark_dirty(th, SB_BUFFER_WITH_SB(s));
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 93) return unused_objectid;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 95)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 96) /* makes object identifier unused */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 97) void reiserfs_release_objectid(struct reiserfs_transaction_handle *th,
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 98) __u32 objectid_to_release)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 99) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 100) struct super_block *s = th->t_super;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 101) struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 102) __le32 *map = objectid_map(s, rs);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 103) int i = 0;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 104)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 105) BUG_ON(!th->t_trans_id);
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 106) /*return; */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 107) check_objectid_map(s, map);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 108)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 109) reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
09f1b80ba8c96 (Jeff Mahoney 2014-04-23 10:00:39 -0400 110) journal_mark_dirty(th, SB_BUFFER_WITH_SB(s));
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 111)
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 112) /*
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 113) * start at the beginning of the objectid map (i = 0) and go to
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 114) * the end of it (i = disk_sb->s_oid_cursize). Linear search is
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 115) * what we use, though it is possible that binary search would be
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 116) * more efficient after performing lots of deletions (which is
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 117) * when oids is large.) We only check even i's.
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 118) */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 119) while (i < sb_oid_cursize(rs)) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 120) if (objectid_to_release == le32_to_cpu(map[i])) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 121) /* This incrementation unallocates the objectid. */
9e902df6be2cb (Marcin Slusarz 2008-04-28 02:16:20 -0700 122) le32_add_cpu(&map[i], 1);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 123)
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 124) /*
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 125) * Did we unallocate the last member of an
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 126) * odd sequence, and can shrink oids?
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 127) */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 128) if (map[i] == map[i + 1]) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 129) /* shrink objectid map */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 130) memmove(map + i, map + i + 2,
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 131) (sb_oid_cursize(rs) - i -
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 132) 2) * sizeof(__u32));
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 133) set_sb_oid_cursize(rs, sb_oid_cursize(rs) - 2);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 134)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 135) RFALSE(sb_oid_cursize(rs) < 2 ||
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 136) sb_oid_cursize(rs) > sb_oid_maxsize(rs),
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 137) "vs-15005: objectid map corrupted cur_size == %d (max == %d)",
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 138) sb_oid_cursize(rs), sb_oid_maxsize(rs));
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 139) }
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 140) return;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 141) }
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 142)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 143) if (objectid_to_release > le32_to_cpu(map[i]) &&
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 144) objectid_to_release < le32_to_cpu(map[i + 1])) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 145) /* size of objectid map is not changed */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 146) if (objectid_to_release + 1 == le32_to_cpu(map[i + 1])) {
9e902df6be2cb (Marcin Slusarz 2008-04-28 02:16:20 -0700 147) le32_add_cpu(&map[i + 1], -1);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 148) return;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 149) }
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 150)
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 151) /*
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 152) * JDM comparing two little-endian values for
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 153) * equality -- safe
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 154) */
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 155) /*
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 156) * objectid map must be expanded, but
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 157) * there is no space
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 158) */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 159) if (sb_oid_cursize(rs) == sb_oid_maxsize(rs)) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 160) PROC_INFO_INC(s, leaked_oid);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 161) return;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 162) }
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 163)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 164) /* expand the objectid map */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 165) memmove(map + i + 3, map + i + 1,
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 166) (sb_oid_cursize(rs) - i - 1) * sizeof(__u32));
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 167) map[i + 1] = cpu_to_le32(objectid_to_release);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 168) map[i + 2] = cpu_to_le32(objectid_to_release + 1);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 169) set_sb_oid_cursize(rs, sb_oid_cursize(rs) + 2);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 170) return;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 171) }
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 172) i += 2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 173) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 174)
0030b64570c86 (Jeff Mahoney 2009-03-30 14:02:28 -0400 175) reiserfs_error(s, "vs-15011", "tried to free free object id (%lu)",
0030b64570c86 (Jeff Mahoney 2009-03-30 14:02:28 -0400 176) (long unsigned)objectid_to_release);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 177) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 178)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 179) int reiserfs_convert_objectid_map_v1(struct super_block *s)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 180) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 181) struct reiserfs_super_block *disk_sb = SB_DISK_SUPER_BLOCK(s);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 182) int cur_size = sb_oid_cursize(disk_sb);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 183) int new_size = (s->s_blocksize - SB_SIZE) / sizeof(__u32) / 2 * 2;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 184) int old_max = sb_oid_maxsize(disk_sb);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 185) struct reiserfs_super_block_v1 *disk_sb_v1;
4a70aebb12689 (zhengbin 2019-09-25 16:47:07 -0700 186) __le32 *objectid_map;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 187) int i;
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 188)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 189) disk_sb_v1 =
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 190) (struct reiserfs_super_block_v1 *)(SB_BUFFER_WITH_SB(s)->b_data);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 191) objectid_map = (__le32 *) (disk_sb_v1 + 1);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 192)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 193) if (cur_size > new_size) {
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 194) /*
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 195) * mark everyone used that was listed as free at
098297b27d23a (Jeff Mahoney 2014-04-23 10:00:36 -0400 196) * the end of the objectid map
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 197) */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 198) objectid_map[new_size - 1] = objectid_map[cur_size - 1];
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 199) set_sb_oid_cursize(disk_sb, new_size);
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 200) }
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 201) /* move the smaller objectid map past the end of the new super */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 202) for (i = new_size - 1; i >= 0; i--) {
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 203) objectid_map[i + (old_max - new_size)] = objectid_map[i];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 204) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 205)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 206) /* set the max size so we don't overflow later */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 207) set_sb_oid_maxsize(disk_sb, new_size);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 208)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 209) /* Zero out label and generate random UUID */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 210) memset(disk_sb->s_label, 0, sizeof(disk_sb->s_label));
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 211) generate_random_uuid(disk_sb->s_uuid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 212)
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 213) /* finally, zero out the unused chunk of the new super */
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 214) memset(disk_sb->s_unused, 0, sizeof(disk_sb->s_unused));
bd4c625c061c2 (Linus Torvalds 2005-07-12 20:21:28 -0700 215) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 216) }
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