[#LU-15083] osp_last_used_init() returns -28

[ 408.221734] LustreError: 17651:0:(osp_dev.c:374:osp_last_used_init()) temp-OST0000-osc-MDT0000: Can not get ids -28 from old objid!
[ 408.222498] LustreError: 17651:0:(obd_config.c:774:class_setup()) setup temp-OST0000-osc-MDT0000 failed (-28)
[ 408.222533] LustreError: 17651:0:(obd_config.c:2001:class_config_llog_handler()) MGC123.123.123.123@tcp: cfg command failed: rc = -28
[ 408.223280] Lustre: cmd=cf003 0:temp-OST0000-osc-MDT0000 1:temp-OST0000_UUID 2:123.123.123.123@tcp
[ 408.223300] LustreError: 13754:0:(mgc_request.c:612:do_requeue()) failed processing log: -28

Lustre version: 2.14.55 (09e2e43241, git://git.whamcloud.com/fs/lustre-release.git)

Linux version: Ubuntu 20.04 5.4.0-89 (49208326b3, git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal)

./configure --with-linux=$KERNEL_SRC_PATH --with-o2ib=no

- osp_last_used_init() calls osp_find_or_create_local_file(), which calls ldiskfs_xattr_set() internally.

ldiskfs_xattr_set() retries ldiskfs_xattr_set_handle() (line 2511) many times but ended up failing because ldiskfs_handle_has_enough_credits() (line 2344) returns 0 (handle>h_buffer_credits < credits).

/* ldiskfs/xattr.c */

...

2300 int
2301 ldiskfs_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
2302                       const char *name, const void *value, size_t value_len,
2303                       int flags)
2304 {
2305         struct ldiskfs_xattr_info i = {
2306                 .name_index = name_index,
2307                 .name = name,
2308                 .value = value,
2309                 .value_len = value_len,
2310                 .in_inode = 0,
2311         };
2312         struct ldiskfs_xattr_ibody_find is = {
2313                 .s = { .not_found = -ENODATA, },
2314         };
2315         struct ldiskfs_xattr_block_find bs = {
2316                 .s = { .not_found = -ENODATA, },
2317         };
2318         int no_expand;
2319         int error;
2320
2321         if (!name)
2322                 return -EINVAL;
2323         if (strlen(name) > 255)
2324                 return -ERANGE;
2325
2326         ldiskfs_write_lock_xattr(inode, &no_expand);
2327
2328         /* Check journal credits under write lock. */
2329         if (ldiskfs_handle_valid(handle)) {
2330                 struct buffer_head *bh;
2331                 int credits;
2332
2333                 bh = ldiskfs_xattr_get_block(inode);
2334                 if (IS_ERR(bh)) {
2335                         error = PTR_ERR(bh);
2336                         goto cleanup;
2337                 }
2338
2339                 credits = __ldiskfs_xattr_set_credits(inode->i_sb, inode, bh,
2340                                                    value_len,
2341                                                    flags & XATTR_CREATE);
2342                 brelse(bh);
2343
2344                 if (!ldiskfs_handle_has_enough_credits(handle, credits)) {
2345                         error = -ENOSPC;
2346                         goto cleanup;
2347                 }
2348                 WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS));
2349         }

...

2486 int
2487 ldiskfs_xattr_set(struct inode *inode, int name_index, const char *name,
2488                const void *value, size_t value_len, int flags)
2489 {
2490         handle_t *handle;
2491         struct super_block *sb = inode->i_sb;
2492         int error, retries = 0;
2493         int credits;
2494
2495         error = dquot_initialize(inode);
2496         if (error)
2497                 return error;
2498
2499 retry:
2500         error = ldiskfs_xattr_set_credits(inode, value_len, flags & XATTR_CREATE,
2501                                        &credits);
2502         if (error)
2503                 return error;
2504
2505         handle = ldiskfs_journal_start(inode, LDISKFS_HT_XATTR, credits);
2506         if (IS_ERR(handle)) {
2507                 error = PTR_ERR(handle);
2508         } else {
2509                 int error2;
2510
2511                 error = ldiskfs_xattr_set_handle(handle, inode, name_index, name,
2512                                               value, value_len, flags);
2513                 error2 = ldiskfs_journal_stop(handle);
2514                 if (error == -ENOSPC &&
2515                     ldiskfs_should_retry_alloc(sb, &retries))
2516                         goto retry;
2517                 if (error == 0)
2518                         error = error2;
2519         }
2520
2521         return error;
2522 }

[LU-15083] osp_last_used_init() returns -28 Created: 12/Oct/21 Updated: 16/Feb/23 Resolved: 30/Nov/21
Status:	Resolved
Project:	Lustre
Component/s:	None
Affects Version/s:	Lustre 2.14.0
Fix Version/s:	Lustre 2.15.0

[LU-15083] osp_last_used_init() returns -28 Created: 12/Oct/21 Updated: 16/Feb/23 Resolved: 30/Nov/21