| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_shared.h" |
| #include "xfs_format.h" |
| #include "xfs_log_format.h" |
| #include "xfs_trans_resv.h" |
| #include "xfs_sb.h" |
| #include "xfs_ag.h" |
| #include "xfs_mount.h" |
| #include "xfs_error.h" |
| #include "xfs_trans.h" |
| #include "xfs_trans_priv.h" |
| #include "xfs_log.h" |
| #include "xfs_log_priv.h" |
| #include "xfs_log_recover.h" |
| #include "xfs_inode.h" |
| #include "xfs_trace.h" |
| #include "xfs_fsops.h" |
| #include "xfs_cksum.h" |
| #include "xfs_sysfs.h" |
| |
| kmem_zone_t *xfs_log_ticket_zone; |
| |
| /* Local miscellaneous function prototypes */ |
| STATIC int |
| xlog_commit_record( |
| struct xlog *log, |
| struct xlog_ticket *ticket, |
| struct xlog_in_core **iclog, |
| xfs_lsn_t *commitlsnp); |
| |
| STATIC struct xlog * |
| xlog_alloc_log( |
| struct xfs_mount *mp, |
| struct xfs_buftarg *log_target, |
| xfs_daddr_t blk_offset, |
| int num_bblks); |
| STATIC int |
| xlog_space_left( |
| struct xlog *log, |
| atomic64_t *head); |
| STATIC int |
| xlog_sync( |
| struct xlog *log, |
| struct xlog_in_core *iclog); |
| STATIC void |
| xlog_dealloc_log( |
| struct xlog *log); |
| |
| /* local state machine functions */ |
| STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); |
| STATIC void |
| xlog_state_do_callback( |
| struct xlog *log, |
| int aborted, |
| struct xlog_in_core *iclog); |
| STATIC int |
| xlog_state_get_iclog_space( |
| struct xlog *log, |
| int len, |
| struct xlog_in_core **iclog, |
| struct xlog_ticket *ticket, |
| int *continued_write, |
| int *logoffsetp); |
| STATIC int |
| xlog_state_release_iclog( |
| struct xlog *log, |
| struct xlog_in_core *iclog); |
| STATIC void |
| xlog_state_switch_iclogs( |
| struct xlog *log, |
| struct xlog_in_core *iclog, |
| int eventual_size); |
| STATIC void |
| xlog_state_want_sync( |
| struct xlog *log, |
| struct xlog_in_core *iclog); |
| |
| STATIC void |
| xlog_grant_push_ail( |
| struct xlog *log, |
| int need_bytes); |
| STATIC void |
| xlog_regrant_reserve_log_space( |
| struct xlog *log, |
| struct xlog_ticket *ticket); |
| STATIC void |
| xlog_ungrant_log_space( |
| struct xlog *log, |
| struct xlog_ticket *ticket); |
| |
| #if defined(DEBUG) |
| STATIC void |
| xlog_verify_dest_ptr( |
| struct xlog *log, |
| char *ptr); |
| STATIC void |
| xlog_verify_grant_tail( |
| struct xlog *log); |
| STATIC void |
| xlog_verify_iclog( |
| struct xlog *log, |
| struct xlog_in_core *iclog, |
| int count, |
| bool syncing); |
| STATIC void |
| xlog_verify_tail_lsn( |
| struct xlog *log, |
| struct xlog_in_core *iclog, |
| xfs_lsn_t tail_lsn); |
| #else |
| #define xlog_verify_dest_ptr(a,b) |
| #define xlog_verify_grant_tail(a) |
| #define xlog_verify_iclog(a,b,c,d) |
| #define xlog_verify_tail_lsn(a,b,c) |
| #endif |
| |
| STATIC int |
| xlog_iclogs_empty( |
| struct xlog *log); |
| |
| static void |
| xlog_grant_sub_space( |
| struct xlog *log, |
| atomic64_t *head, |
| int bytes) |
| { |
| int64_t head_val = atomic64_read(head); |
| int64_t new, old; |
| |
| do { |
| int cycle, space; |
| |
| xlog_crack_grant_head_val(head_val, &cycle, &space); |
| |
| space -= bytes; |
| if (space < 0) { |
| space += log->l_logsize; |
| cycle--; |
| } |
| |
| old = head_val; |
| new = xlog_assign_grant_head_val(cycle, space); |
| head_val = atomic64_cmpxchg(head, old, new); |
| } while (head_val != old); |
| } |
| |
| static void |
| xlog_grant_add_space( |
| struct xlog *log, |
| atomic64_t *head, |
| int bytes) |
| { |
| int64_t head_val = atomic64_read(head); |
| int64_t new, old; |
| |
| do { |
| int tmp; |
| int cycle, space; |
| |
| xlog_crack_grant_head_val(head_val, &cycle, &space); |
| |
| tmp = log->l_logsize - space; |
| if (tmp > bytes) |
| space += bytes; |
| else { |
| space = bytes - tmp; |
| cycle++; |
| } |
| |
| old = head_val; |
| new = xlog_assign_grant_head_val(cycle, space); |
| head_val = atomic64_cmpxchg(head, old, new); |
| } while (head_val != old); |
| } |
| |
| STATIC void |
| xlog_grant_head_init( |
| struct xlog_grant_head *head) |
| { |
| xlog_assign_grant_head(&head->grant, 1, 0); |
| INIT_LIST_HEAD(&head->waiters); |
| spin_lock_init(&head->lock); |
| } |
| |
| STATIC void |
| xlog_grant_head_wake_all( |
| struct xlog_grant_head *head) |
| { |
| struct xlog_ticket *tic; |
| |
| spin_lock(&head->lock); |
| list_for_each_entry(tic, &head->waiters, t_queue) |
| wake_up_process(tic->t_task); |
| spin_unlock(&head->lock); |
| } |
| |
| static inline int |
| xlog_ticket_reservation( |
| struct xlog *log, |
| struct xlog_grant_head *head, |
| struct xlog_ticket *tic) |
| { |
| if (head == &log->l_write_head) { |
| ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); |
| return tic->t_unit_res; |
| } else { |
| if (tic->t_flags & XLOG_TIC_PERM_RESERV) |
| return tic->t_unit_res * tic->t_cnt; |
| else |
| return tic->t_unit_res; |
| } |
| } |
| |
| STATIC bool |
| xlog_grant_head_wake( |
| struct xlog *log, |
| struct xlog_grant_head *head, |
| int *free_bytes) |
| { |
| struct xlog_ticket *tic; |
| int need_bytes; |
| |
| list_for_each_entry(tic, &head->waiters, t_queue) { |
| need_bytes = xlog_ticket_reservation(log, head, tic); |
| if (*free_bytes < need_bytes) |
| return false; |
| |
| *free_bytes -= need_bytes; |
| trace_xfs_log_grant_wake_up(log, tic); |
| wake_up_process(tic->t_task); |
| } |
| |
| return true; |
| } |
| |
| STATIC int |
| xlog_grant_head_wait( |
| struct xlog *log, |
| struct xlog_grant_head *head, |
| struct xlog_ticket *tic, |
| int need_bytes) __releases(&head->lock) |
| __acquires(&head->lock) |
| { |
| list_add_tail(&tic->t_queue, &head->waiters); |
| |
| do { |
| if (XLOG_FORCED_SHUTDOWN(log)) |
| goto shutdown; |
| xlog_grant_push_ail(log, need_bytes); |
| |
| __set_current_state(TASK_UNINTERRUPTIBLE); |
| spin_unlock(&head->lock); |
| |
| XFS_STATS_INC(xs_sleep_logspace); |
| |
| trace_xfs_log_grant_sleep(log, tic); |
| schedule(); |
| trace_xfs_log_grant_wake(log, tic); |
| |
| spin_lock(&head->lock); |
| if (XLOG_FORCED_SHUTDOWN(log)) |
| goto shutdown; |
| } while (xlog_space_left(log, &head->grant) < need_bytes); |
| |
| list_del_init(&tic->t_queue); |
| return 0; |
| shutdown: |
| list_del_init(&tic->t_queue); |
| return -EIO; |
| } |
| |
| /* |
| * Atomically get the log space required for a log ticket. |
| * |
| * Once a ticket gets put onto head->waiters, it will only return after the |
| * needed reservation is satisfied. |
| * |
| * This function is structured so that it has a lock free fast path. This is |
| * necessary because every new transaction reservation will come through this |
| * path. Hence any lock will be globally hot if we take it unconditionally on |
| * every pass. |
| * |
| * As tickets are only ever moved on and off head->waiters under head->lock, we |
| * only need to take that lock if we are going to add the ticket to the queue |
| * and sleep. We can avoid taking the lock if the ticket was never added to |
| * head->waiters because the t_queue list head will be empty and we hold the |
| * only reference to it so it can safely be checked unlocked. |
| */ |
| STATIC int |
| xlog_grant_head_check( |
| struct xlog *log, |
| struct xlog_grant_head *head, |
| struct xlog_ticket *tic, |
| int *need_bytes) |
| { |
| int free_bytes; |
| int error = 0; |
| |
| ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
| |
| /* |
| * If there are other waiters on the queue then give them a chance at |
| * logspace before us. Wake up the first waiters, if we do not wake |
| * up all the waiters then go to sleep waiting for more free space, |
| * otherwise try to get some space for this transaction. |
| */ |
| *need_bytes = xlog_ticket_reservation(log, head, tic); |
| free_bytes = xlog_space_left(log, &head->grant); |
| if (!list_empty_careful(&head->waiters)) { |
| spin_lock(&head->lock); |
| if (!xlog_grant_head_wake(log, head, &free_bytes) || |
| free_bytes < *need_bytes) { |
| error = xlog_grant_head_wait(log, head, tic, |
| *need_bytes); |
| } |
| spin_unlock(&head->lock); |
| } else if (free_bytes < *need_bytes) { |
| spin_lock(&head->lock); |
| error = xlog_grant_head_wait(log, head, tic, *need_bytes); |
| spin_unlock(&head->lock); |
| } |
| |
| return error; |
| } |
| |
| static void |
| xlog_tic_reset_res(xlog_ticket_t *tic) |
| { |
| tic->t_res_num = 0; |
| tic->t_res_arr_sum = 0; |
| tic->t_res_num_ophdrs = 0; |
| } |
| |
| static void |
| xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) |
| { |
| if (tic->t_res_num == XLOG_TIC_LEN_MAX) { |
| /* add to overflow and start again */ |
| tic->t_res_o_flow += tic->t_res_arr_sum; |
| tic->t_res_num = 0; |
| tic->t_res_arr_sum = 0; |
| } |
| |
| tic->t_res_arr[tic->t_res_num].r_len = len; |
| tic->t_res_arr[tic->t_res_num].r_type = type; |
| tic->t_res_arr_sum += len; |
| tic->t_res_num++; |
| } |
| |
| /* |
| * Replenish the byte reservation required by moving the grant write head. |
| */ |
| int |
| xfs_log_regrant( |
| struct xfs_mount *mp, |
| struct xlog_ticket *tic) |
| { |
| struct xlog *log = mp->m_log; |
| int need_bytes; |
| int error = 0; |
| |
| if (XLOG_FORCED_SHUTDOWN(log)) |
| return -EIO; |
| |
| XFS_STATS_INC(xs_try_logspace); |
| |
| /* |
| * This is a new transaction on the ticket, so we need to change the |
| * transaction ID so that the next transaction has a different TID in |
| * the log. Just add one to the existing tid so that we can see chains |
| * of rolling transactions in the log easily. |
| */ |
| tic->t_tid++; |
| |
| xlog_grant_push_ail(log, tic->t_unit_res); |
| |
| tic->t_curr_res = tic->t_unit_res; |
| xlog_tic_reset_res(tic); |
| |
| if (tic->t_cnt > 0) |
| return 0; |
| |
| trace_xfs_log_regrant(log, tic); |
| |
| error = xlog_grant_head_check(log, &log->l_write_head, tic, |
| &need_bytes); |
| if (error) |
| goto out_error; |
| |
| xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); |
| trace_xfs_log_regrant_exit(log, tic); |
| xlog_verify_grant_tail(log); |
| return 0; |
| |
| out_error: |
| /* |
| * If we are failing, make sure the ticket doesn't have any current |
| * reservations. We don't want to add this back when the ticket/ |
| * transaction gets cancelled. |
| */ |
| tic->t_curr_res = 0; |
| tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ |
| return error; |
| } |
| |
| /* |
| * Reserve log space and return a ticket corresponding the reservation. |
| * |
| * Each reservation is going to reserve extra space for a log record header. |
| * When writes happen to the on-disk log, we don't subtract the length of the |
| * log record header from any reservation. By wasting space in each |
| * reservation, we prevent over allocation problems. |
| */ |
| int |
| xfs_log_reserve( |
| struct xfs_mount *mp, |
| int unit_bytes, |
| int cnt, |
| struct xlog_ticket **ticp, |
| __uint8_t client, |
| bool permanent, |
| uint t_type) |
| { |
| struct xlog *log = mp->m_log; |
| struct xlog_ticket *tic; |
| int need_bytes; |
| int error = 0; |
| |
| ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); |
| |
| if (XLOG_FORCED_SHUTDOWN(log)) |
| return -EIO; |
| |
| XFS_STATS_INC(xs_try_logspace); |
| |
| ASSERT(*ticp == NULL); |
| tic = xlog_ticket_alloc(log, unit_bytes, cnt, client, permanent, |
| KM_SLEEP | KM_MAYFAIL); |
| if (!tic) |
| return -ENOMEM; |
| |
| tic->t_trans_type = t_type; |
| *ticp = tic; |
| |
| xlog_grant_push_ail(log, tic->t_cnt ? tic->t_unit_res * tic->t_cnt |
| : tic->t_unit_res); |
| |
| trace_xfs_log_reserve(log, tic); |
| |
| error = xlog_grant_head_check(log, &log->l_reserve_head, tic, |
| &need_bytes); |
| if (error) |
| goto out_error; |
| |
| xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes); |
| xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); |
| trace_xfs_log_reserve_exit(log, tic); |
| xlog_verify_grant_tail(log); |
| return 0; |
| |
| out_error: |
| /* |
| * If we are failing, make sure the ticket doesn't have any current |
| * reservations. We don't want to add this back when the ticket/ |
| * transaction gets cancelled. |
| */ |
| tic->t_curr_res = 0; |
| tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ |
| return error; |
| } |
| |
| |
| /* |
| * NOTES: |
| * |
| * 1. currblock field gets updated at startup and after in-core logs |
| * marked as with WANT_SYNC. |
| */ |
| |
| /* |
| * This routine is called when a user of a log manager ticket is done with |
| * the reservation. If the ticket was ever used, then a commit record for |
| * the associated transaction is written out as a log operation header with |
| * no data. The flag XLOG_TIC_INITED is set when the first write occurs with |
| * a given ticket. If the ticket was one with a permanent reservation, then |
| * a few operations are done differently. Permanent reservation tickets by |
| * default don't release the reservation. They just commit the current |
| * transaction with the belief that the reservation is still needed. A flag |
| * must be passed in before permanent reservations are actually released. |
| * When these type of tickets are not released, they need to be set into |
| * the inited state again. By doing this, a start record will be written |
| * out when the next write occurs. |
| */ |
| xfs_lsn_t |
| xfs_log_done( |
| struct xfs_mount *mp, |
| struct xlog_ticket *ticket, |
| struct xlog_in_core **iclog, |
| uint flags) |
| { |
| struct xlog *log = mp->m_log; |
| xfs_lsn_t lsn = 0; |
| |
| if (XLOG_FORCED_SHUTDOWN(log) || |
| /* |
| * If nothing was ever written, don't write out commit record. |
| * If we get an error, just continue and give back the log ticket. |
| */ |
| (((ticket->t_flags & XLOG_TIC_INITED) == 0) && |
| (xlog_commit_record(log, ticket, iclog, &lsn)))) { |
| lsn = (xfs_lsn_t) -1; |
| if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { |
| flags |= XFS_LOG_REL_PERM_RESERV; |
| } |
| } |
| |
| |
| if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || |
| (flags & XFS_LOG_REL_PERM_RESERV)) { |
| trace_xfs_log_done_nonperm(log, ticket); |
| |
| /* |
| * Release ticket if not permanent reservation or a specific |
| * request has been made to release a permanent reservation. |
| */ |
| xlog_ungrant_log_space(log, ticket); |
| xfs_log_ticket_put(ticket); |
| } else { |
| trace_xfs_log_done_perm(log, ticket); |
| |
| xlog_regrant_reserve_log_space(log, ticket); |
| /* If this ticket was a permanent reservation and we aren't |
| * trying to release it, reset the inited flags; so next time |
| * we write, a start record will be written out. |
| */ |
| ticket->t_flags |= XLOG_TIC_INITED; |
| } |
| |
| return lsn; |
| } |
| |
| /* |
| * Attaches a new iclog I/O completion callback routine during |
| * transaction commit. If the log is in error state, a non-zero |
| * return code is handed back and the caller is responsible for |
| * executing the callback at an appropriate time. |
| */ |
| int |
| xfs_log_notify( |
| struct xfs_mount *mp, |
| struct xlog_in_core *iclog, |
| xfs_log_callback_t *cb) |
| { |
| int abortflg; |
| |
| spin_lock(&iclog->ic_callback_lock); |
| abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); |
| if (!abortflg) { |
| ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || |
| (iclog->ic_state == XLOG_STATE_WANT_SYNC)); |
| cb->cb_next = NULL; |
| *(iclog->ic_callback_tail) = cb; |
| iclog->ic_callback_tail = &(cb->cb_next); |
| } |
| spin_unlock(&iclog->ic_callback_lock); |
| return abortflg; |
| } |
| |
| int |
| xfs_log_release_iclog( |
| struct xfs_mount *mp, |
| struct xlog_in_core *iclog) |
| { |
| if (xlog_state_release_iclog(mp->m_log, iclog)) { |
| xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Mount a log filesystem |
| * |
| * mp - ubiquitous xfs mount point structure |
| * log_target - buftarg of on-disk log device |
| * blk_offset - Start block # where block size is 512 bytes (BBSIZE) |
| * num_bblocks - Number of BBSIZE blocks in on-disk log |
| * |
| * Return error or zero. |
| */ |
| int |
| xfs_log_mount( |
| xfs_mount_t *mp, |
| xfs_buftarg_t *log_target, |
| xfs_daddr_t blk_offset, |
| int num_bblks) |
| { |
| int error = 0; |
| int min_logfsbs; |
| |
| if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { |
| xfs_notice(mp, "Mounting V%d Filesystem", |
| XFS_SB_VERSION_NUM(&mp->m_sb)); |
| } else { |
| xfs_notice(mp, |
| "Mounting V%d filesystem in no-recovery mode. Filesystem will be inconsistent.", |
| XFS_SB_VERSION_NUM(&mp->m_sb)); |
| ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
| } |
| |
| mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); |
| if (IS_ERR(mp->m_log)) { |
| error = PTR_ERR(mp->m_log); |
| goto out; |
| } |
| |
| /* |
| * Validate the given log space and drop a critical message via syslog |
| * if the log size is too small that would lead to some unexpected |
| * situations in transaction log space reservation stage. |
| * |
| * Note: we can't just reject the mount if the validation fails. This |
| * would mean that people would have to downgrade their kernel just to |
| * remedy the situation as there is no way to grow the log (short of |
| * black magic surgery with xfs_db). |
| * |
| * We can, however, reject mounts for CRC format filesystems, as the |
| * mkfs binary being used to make the filesystem should never create a |
| * filesystem with a log that is too small. |
| */ |
| min_logfsbs = xfs_log_calc_minimum_size(mp); |
| |
| if (mp->m_sb.sb_logblocks < min_logfsbs) { |
| xfs_warn(mp, |
| "Log size %d blocks too small, minimum size is %d blocks", |
| mp->m_sb.sb_logblocks, min_logfsbs); |
| error = -EINVAL; |
| } else if (mp->m_sb.sb_logblocks > XFS_MAX_LOG_BLOCKS) { |
| xfs_warn(mp, |
| "Log size %d blocks too large, maximum size is %lld blocks", |
| mp->m_sb.sb_logblocks, XFS_MAX_LOG_BLOCKS); |
| error = -EINVAL; |
| } else if (XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks) > XFS_MAX_LOG_BYTES) { |
| xfs_warn(mp, |
| "log size %lld bytes too large, maximum size is %lld bytes", |
| XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks), |
| XFS_MAX_LOG_BYTES); |
| error = -EINVAL; |
| } |
| if (error) { |
| if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| xfs_crit(mp, "AAIEEE! Log failed size checks. Abort!"); |
| ASSERT(0); |
| goto out_free_log; |
| } |
| xfs_crit(mp, |
| "Log size out of supported range. Continuing onwards, but if log hangs are\n" |
| "experienced then please report this message in the bug report."); |
| } |
| |
| /* |
| * Initialize the AIL now we have a log. |
| */ |
| error = xfs_trans_ail_init(mp); |
| if (error) { |
| xfs_warn(mp, "AIL initialisation failed: error %d", error); |
| goto out_free_log; |
| } |
| mp->m_log->l_ailp = mp->m_ail; |
| |
| /* |
| * skip log recovery on a norecovery mount. pretend it all |
| * just worked. |
| */ |
| if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { |
| int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
| |
| if (readonly) |
| mp->m_flags &= ~XFS_MOUNT_RDONLY; |
| |
| error = xlog_recover(mp->m_log); |
| |
| if (readonly) |
| mp->m_flags |= XFS_MOUNT_RDONLY; |
| if (error) { |
| xfs_warn(mp, "log mount/recovery failed: error %d", |
| error); |
| goto out_destroy_ail; |
| } |
| } |
| |
| error = xfs_sysfs_init(&mp->m_log->l_kobj, &xfs_log_ktype, &mp->m_kobj, |
| "log"); |
| if (error) |
| goto out_destroy_ail; |
| |
| /* Normal transactions can now occur */ |
| mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; |
| |
| /* |
| * Now the log has been fully initialised and we know were our |
| * space grant counters are, we can initialise the permanent ticket |
| * needed for delayed logging to work. |
| */ |
| xlog_cil_init_post_recovery(mp->m_log); |
| |
| return 0; |
| |
| out_destroy_ail: |
| xfs_trans_ail_destroy(mp); |
| out_free_log: |
| xlog_dealloc_log(mp->m_log); |
| out: |
| return error; |
| } |
| |
| /* |
| * Finish the recovery of the file system. This is separate from the |
| * xfs_log_mount() call, because it depends on the code in xfs_mountfs() to read |
| * in the root and real-time bitmap inodes between calling xfs_log_mount() and |
| * here. |
| * |
| * If we finish recovery successfully, start the background log work. If we are |
| * not doing recovery, then we have a RO filesystem and we don't need to start |
| * it. |
| */ |
| int |
| xfs_log_mount_finish(xfs_mount_t *mp) |
| { |
| int error = 0; |
| |
| if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { |
| error = xlog_recover_finish(mp->m_log); |
| if (!error) |
| xfs_log_work_queue(mp); |
| } else { |
| ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
| } |
| |
| |
| return error; |
| } |
| |
| /* |
| * Final log writes as part of unmount. |
| * |
| * Mark the filesystem clean as unmount happens. Note that during relocation |
| * this routine needs to be executed as part of source-bag while the |
| * deallocation must not be done until source-end. |
| */ |
| |
| /* |
| * Unmount record used to have a string "Unmount filesystem--" in the |
| * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). |
| * We just write the magic number now since that particular field isn't |
| * currently architecture converted and "Unmount" is a bit foo. |
| * As far as I know, there weren't any dependencies on the old behaviour. |
| */ |
| |
| int |
| xfs_log_unmount_write(xfs_mount_t *mp) |
| { |
| struct xlog *log = mp->m_log; |
| xlog_in_core_t *iclog; |
| #ifdef DEBUG |
| xlog_in_core_t *first_iclog; |
| #endif |
| xlog_ticket_t *tic = NULL; |
| xfs_lsn_t lsn; |
| int error; |
| |
| /* |
| * Don't write out unmount record on read-only mounts. |
| * Or, if we are doing a forced umount (typically because of IO errors). |
| */ |
| if (mp->m_flags & XFS_MOUNT_RDONLY) |
| return 0; |
| |
| error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
| ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); |
| |
| #ifdef DEBUG |
| first_iclog = iclog = log->l_iclog; |
| do { |
| if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { |
| ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); |
| ASSERT(iclog->ic_offset == 0); |
| } |
| iclog = iclog->ic_next; |
| } while (iclog != first_iclog); |
| #endif |
| if (! (XLOG_FORCED_SHUTDOWN(log))) { |
| error = xfs_log_reserve(mp, 600, 1, &tic, |
| XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); |
| if (!error) { |
| /* the data section must be 32 bit size aligned */ |
| struct { |
| __uint16_t magic; |
| __uint16_t pad1; |
| __uint32_t pad2; /* may as well make it 64 bits */ |
| } magic = { |
| .magic = XLOG_UNMOUNT_TYPE, |
| }; |
| struct xfs_log_iovec reg = { |
| .i_addr = &magic, |
| .i_len = sizeof(magic), |
| .i_type = XLOG_REG_TYPE_UNMOUNT, |
| }; |
| struct xfs_log_vec vec = { |
| .lv_niovecs = 1, |
| .lv_iovecp = ®, |
| }; |
| |
| /* remove inited flag, and account for space used */ |
| tic->t_flags = 0; |
| tic->t_curr_res -= sizeof(magic); |
| error = xlog_write(log, &vec, tic, &lsn, |
| NULL, XLOG_UNMOUNT_TRANS); |
| /* |
| * At this point, we're umounting anyway, |
| * so there's no point in transitioning log state |
| * to IOERROR. Just continue... |
| */ |
| } |
| |
| if (error) |
| xfs_alert(mp, "%s: unmount record failed", __func__); |
| |
| |
| spin_lock(&log->l_icloglock); |
| iclog = log->l_iclog; |
| atomic_inc(&iclog->ic_refcnt); |
| xlog_state_want_sync(log, iclog); |
| spin_unlock(&log->l_icloglock); |
| error = xlog_state_release_iclog(log, iclog); |
| |
| spin_lock(&log->l_icloglock); |
| if (!(iclog->ic_state == XLOG_STATE_ACTIVE || |
| iclog->ic_state == XLOG_STATE_DIRTY)) { |
| if (!XLOG_FORCED_SHUTDOWN(log)) { |
| xlog_wait(&iclog->ic_force_wait, |
| &log->l_icloglock); |
| } else { |
| spin_unlock(&log->l_icloglock); |
| } |
| } else { |
| spin_unlock(&log->l_icloglock); |
| } |
| if (tic) { |
| trace_xfs_log_umount_write(log, tic); |
| xlog_ungrant_log_space(log, tic); |
| xfs_log_ticket_put(tic); |
| } |
| } else { |
| /* |
| * We're already in forced_shutdown mode, couldn't |
| * even attempt to write out the unmount transaction. |
| * |
| * Go through the motions of sync'ing and releasing |
| * the iclog, even though no I/O will actually happen, |
| * we need to wait for other log I/Os that may already |
| * be in progress. Do this as a separate section of |
| * code so we'll know if we ever get stuck here that |
| * we're in this odd situation of trying to unmount |
| * a file system that went into forced_shutdown as |
| * the result of an unmount.. |
| */ |
| spin_lock(&log->l_icloglock); |
| iclog = log->l_iclog; |
| atomic_inc(&iclog->ic_refcnt); |
| |
| xlog_state_want_sync(log, iclog); |
| spin_unlock(&log->l_icloglock); |
| error = xlog_state_release_iclog(log, iclog); |
| |
| spin_lock(&log->l_icloglock); |
| |
| if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE |
| || iclog->ic_state == XLOG_STATE_DIRTY |
| || iclog->ic_state == XLOG_STATE_IOERROR) ) { |
| |
| xlog_wait(&iclog->ic_force_wait, |
| &log->l_icloglock); |
| } else { |
| spin_unlock(&log->l_icloglock); |
| } |
| } |
| |
| return error; |
| } /* xfs_log_unmount_write */ |
| |
| /* |
| * Empty the log for unmount/freeze. |
| * |
| * To do this, we first need to shut down the background log work so it is not |
| * trying to cover the log as we clean up. We then need to unpin all objects in |
| * the log so we can then flush them out. Once they have completed their IO and |
| * run the callbacks removing themselves from the AIL, we can write the unmount |
| * record. |
| */ |
| void |
| xfs_log_quiesce( |
| struct xfs_mount *mp) |
| { |
| cancel_delayed_work_sync(&mp->m_log->l_work); |
| xfs_log_force(mp, XFS_LOG_SYNC); |
| |
| /* |
| * The superblock buffer is uncached and while xfs_ail_push_all_sync() |
| * will push it, xfs_wait_buftarg() will not wait for it. Further, |
| * xfs_buf_iowait() cannot be used because it was pushed with the |
| * XBF_ASYNC flag set, so we need to use a lock/unlock pair to wait for |
| * the IO to complete. |
| */ |
| xfs_ail_push_all_sync(mp->m_ail); |
| xfs_wait_buftarg(mp->m_ddev_targp); |
| xfs_buf_lock(mp->m_sb_bp); |
| xfs_buf_unlock(mp->m_sb_bp); |
| |
| xfs_log_unmount_write(mp); |
| } |
| |
| /* |
| * Shut down and release the AIL and Log. |
| * |
| * During unmount, we need to ensure we flush all the dirty metadata objects |
| * from the AIL so that the log is empty before we write the unmount record to |
| * the log. Once this is done, we can tear down the AIL and the log. |
| */ |
| void |
| xfs_log_unmount( |
| struct xfs_mount *mp) |
| { |
| xfs_log_quiesce(mp); |
| |
| xfs_trans_ail_destroy(mp); |
| |
| xfs_sysfs_del(&mp->m_log->l_kobj); |
| |
| xlog_dealloc_log(mp->m_log); |
| } |
| |
| void |
| xfs_log_item_init( |
| struct xfs_mount *mp, |
| struct xfs_log_item *item, |
| int type, |
| const struct xfs_item_ops *ops) |
| { |
| item->li_mountp = mp; |
| item->li_ailp = mp->m_ail; |
| item->li_type = type; |
| item->li_ops = ops; |
| item->li_lv = NULL; |
| |
| INIT_LIST_HEAD(&item->li_ail); |
| INIT_LIST_HEAD(&item->li_cil); |
| } |
| |
| /* |
| * Wake up processes waiting for log space after we have moved the log tail. |
| */ |
| void |
| xfs_log_space_wake( |
| struct xfs_mount *mp) |
| { |
| struct xlog *log = mp->m_log; |
| int free_bytes; |
| |
| if (XLOG_FORCED_SHUTDOWN(log)) |
| return; |
| |
| if (!list_empty_careful(&log->l_write_head.waiters)) { |
| ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
| |
| spin_lock(&log->l_write_head.lock); |
| free_bytes = xlog_space_left(log, &log->l_write_head.grant); |
| xlog_grant_head_wake(log, &log->l_write_head, &free_bytes); |
| spin_unlock(&log->l_write_head.lock); |
| } |
| |
| if (!list_empty_careful(&log->l_reserve_head.waiters)) { |
| ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
| |
| spin_lock(&log->l_reserve_head.lock); |
| free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); |
| xlog_grant_head_wake(log, &log->l_reserve_head, &free_bytes); |
| spin_unlock(&log->l_reserve_head.lock); |
| } |
| } |
| |
| /* |
| * Determine if we have a transaction that has gone to disk that needs to be |
| * covered. To begin the transition to the idle state firstly the log needs to |
| * be idle. That means the CIL, the AIL and the iclogs needs to be empty before |
| * we start attempting to cover the log. |
| * |
| * Only if we are then in a state where covering is needed, the caller is |
| * informed that dummy transactions are required to move the log into the idle |
| * state. |
| * |
| * If there are any items in the AIl or CIL, then we do not want to attempt to |
| * cover the log as we may be in a situation where there isn't log space |
| * available to run a dummy transaction and this can lead to deadlocks when the |
| * tail of the log is pinned by an item that is modified in the CIL. Hence |
| * there's no point in running a dummy transaction at this point because we |
| * can't start trying to idle the log until both the CIL and AIL are empty. |
| */ |
| int |
| xfs_log_need_covered(xfs_mount_t *mp) |
| { |
| struct xlog *log = mp->m_log; |
| int needed = 0; |
| |
| if (!xfs_fs_writable(mp)) |
| return 0; |
| |
| if (!xlog_cil_empty(log)) |
| return 0; |
| |
| spin_lock(&log->l_icloglock); |
| switch (log->l_covered_state) { |
| case XLOG_STATE_COVER_DONE: |
| case XLOG_STATE_COVER_DONE2: |
| case XLOG_STATE_COVER_IDLE: |
| break; |
| case XLOG_STATE_COVER_NEED: |
| case XLOG_STATE_COVER_NEED2: |
| if (xfs_ail_min_lsn(log->l_ailp)) |
| break; |
| if (!xlog_iclogs_empty(log)) |
| break; |
| |
| needed = 1; |
| if (log->l_covered_state == XLOG_STATE_COVER_NEED) |
| log->l_covered_state = XLOG_STATE_COVER_DONE; |
| else |
| log->l_covered_state = XLOG_STATE_COVER_DONE2; |
| break; |
| default: |
| needed = 1; |
| break; |
| } |
| spin_unlock(&log->l_icloglock); |
| return needed; |
| } |
| |
| /* |
| * We may be holding the log iclog lock upon entering this routine. |
| */ |
| xfs_lsn_t |
| xlog_assign_tail_lsn_locked( |
| struct xfs_mount *mp) |
| { |
| struct xlog *log = mp->m_log; |
| struct xfs_log_item *lip; |
| xfs_lsn_t tail_lsn; |
| |
| assert_spin_locked(&mp->m_ail->xa_lock); |
| |
| /* |
| * To make sure we always have a valid LSN for the log tail we keep |
| * track of the last LSN which was committed in log->l_last_sync_lsn, |
| * and use that when the AIL was empty. |
| */ |
| lip = xfs_ail_min(mp->m_ail); |
| if (lip) |
| tail_lsn = lip->li_lsn; |
| else |
| tail_lsn = atomic64_read(&log->l_last_sync_lsn); |
| trace_xfs_log_assign_tail_lsn(log, tail_lsn); |
| atomic64_set(&log->l_tail_lsn, tail_lsn); |
| return tail_lsn; |
| } |
| |
| xfs_lsn_t |
| xlog_assign_tail_lsn( |
| struct xfs_mount *mp) |
| { |
| xfs_lsn_t tail_lsn; |
| |
| spin_lock(&mp->m_ail->xa_lock); |
| tail_lsn = xlog_assign_tail_lsn_locked(mp); |
| spin_unlock(&mp->m_ail->xa_lock); |
| |
| return tail_lsn; |
| } |
| |
| /* |
| * Return the space in the log between the tail and the head. The head |
| * is passed in the cycle/bytes formal parms. In the special case where |
| * the reserve head has wrapped passed the tail, this calculation is no |
| * longer valid. In this case, just return 0 which means there is no space |
| * in the log. This works for all places where this function is called |
| * with the reserve head. Of course, if the write head were to ever |
| * wrap the tail, we should blow up. Rather than catch this case here, |
| * we depend on other ASSERTions in other parts of the code. XXXmiken |
| * |
| * This code also handles the case where the reservation head is behind |
| * the tail. The details of this case are described below, but the end |
| * result is that we return the size of the log as the amount of space left. |
| */ |
| STATIC int |
| xlog_space_left( |
| struct xlog *log, |
| atomic64_t *head) |
| { |
| int free_bytes; |
| int tail_bytes; |
| int tail_cycle; |
| int head_cycle; |
| int head_bytes; |
| |
| xlog_crack_grant_head(head, &head_cycle, &head_bytes); |
| xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_bytes); |
| tail_bytes = BBTOB(tail_bytes); |
| if (tail_cycle == head_cycle && head_bytes >= tail_bytes) |
| free_bytes = log->l_logsize - (head_bytes - tail_bytes); |
| else if (tail_cycle + 1 < head_cycle) |
| return 0; |
| else if (tail_cycle < head_cycle) { |
| ASSERT(tail_cycle == (head_cycle - 1)); |
| free_bytes = tail_bytes - head_bytes; |
| } else { |
| /* |
| * The reservation head is behind the tail. |
| * In this case we just want to return the size of the |
| * log as the amount of space left. |
| */ |
| xfs_alert(log->l_mp, |
| "xlog_space_left: head behind tail\n" |
| " tail_cycle = %d, tail_bytes = %d\n" |
| " GH cycle = %d, GH bytes = %d", |
| tail_cycle, tail_bytes, head_cycle, head_bytes); |
| ASSERT(0); |
| free_bytes = log->l_logsize; |
| } |
| return free_bytes; |
| } |
| |
| |
| /* |
| * Log function which is called when an io completes. |
| * |
| * The log manager needs its own routine, in order to control what |
| * happens with the buffer after the write completes. |
| */ |
| void |
| xlog_iodone(xfs_buf_t *bp) |
| { |
| struct xlog_in_core *iclog = bp->b_fspriv; |
| struct xlog *l = iclog->ic_log; |
| int aborted = 0; |
| |
| /* |
| * Race to shutdown the filesystem if we see an error. |
| */ |
| if (XFS_TEST_ERROR(bp->b_error, l->l_mp, |
| XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { |
| xfs_buf_ioerror_alert(bp, __func__); |
| xfs_buf_stale(bp); |
| xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); |
| /* |
| * This flag will be propagated to the trans-committed |
| * callback routines to let them know that the log-commit |
| * didn't succeed. |
| */ |
| aborted = XFS_LI_ABORTED; |
| } else if (iclog->ic_state & XLOG_STATE_IOERROR) { |
| aborted = XFS_LI_ABORTED; |
| } |
| |
| /* log I/O is always issued ASYNC */ |
| ASSERT(XFS_BUF_ISASYNC(bp)); |
| xlog_state_done_syncing(iclog, aborted); |
| |
| /* |
| * drop the buffer lock now that we are done. Nothing references |
| * the buffer after this, so an unmount waiting on this lock can now |
| * tear it down safely. As such, it is unsafe to reference the buffer |
| * (bp) after the unlock as we could race with it being freed. |
| */ |
| xfs_buf_unlock(bp); |
| } |
| |
| /* |
| * Return size of each in-core log record buffer. |
| * |
| * All machines get 8 x 32kB buffers by default, unless tuned otherwise. |
| * |
| * If the filesystem blocksize is too large, we may need to choose a |
| * larger size since the directory code currently logs entire blocks. |
| */ |
| |
| STATIC void |
| xlog_get_iclog_buffer_size( |
| struct xfs_mount *mp, |
| struct xlog *log) |
| { |
| int size; |
| int xhdrs; |
| |
| if (mp->m_logbufs <= 0) |
| log->l_iclog_bufs = XLOG_MAX_ICLOGS; |
| else |
| log->l_iclog_bufs = mp->m_logbufs; |
| |
| /* |
| * Buffer size passed in from mount system call. |
| */ |
| if (mp->m_logbsize > 0) { |
| size = log->l_iclog_size = mp->m_logbsize; |
| log->l_iclog_size_log = 0; |
| while (size != 1) { |
| log->l_iclog_size_log++; |
| size >>= 1; |
| } |
| |
| if (xfs_sb_version_haslogv2(&mp->m_sb)) { |
| /* # headers = size / 32k |
| * one header holds cycles from 32k of data |
| */ |
| |
| xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; |
| if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) |
| xhdrs++; |
| log->l_iclog_hsize = xhdrs << BBSHIFT; |
| log->l_iclog_heads = xhdrs; |
| } else { |
| ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); |
| log->l_iclog_hsize = BBSIZE; |
| log->l_iclog_heads = 1; |
| } |
| goto done; |
| } |
| |
| /* All machines use 32kB buffers by default. */ |
| log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; |
| log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; |
| |
| /* the default log size is 16k or 32k which is one header sector */ |
| log->l_iclog_hsize = BBSIZE; |
| log->l_iclog_heads = 1; |
| |
| done: |
| /* are we being asked to make the sizes selected above visible? */ |
| if (mp->m_logbufs == 0) |
| mp->m_logbufs = log->l_iclog_bufs; |
| if (mp->m_logbsize == 0) |
| mp->m_logbsize = log->l_iclog_size; |
| } /* xlog_get_iclog_buffer_size */ |
| |
| |
| void |
| xfs_log_work_queue( |
| struct xfs_mount *mp) |
| { |
| queue_delayed_work(mp->m_log_workqueue, &mp->m_log->l_work, |
| msecs_to_jiffies(xfs_syncd_centisecs * 10)); |
| } |
| |
| /* |
| * Every sync period we need to unpin all items in the AIL and push them to |
| * disk. If there is nothing dirty, then we might need to cover the log to |
| * indicate that the filesystem is idle. |
| */ |
| void |
| xfs_log_worker( |
| struct work_struct *work) |
| { |
| struct xlog *log = container_of(to_delayed_work(work), |
| struct xlog, l_work); |
| struct xfs_mount *mp = log->l_mp; |
| |
| /* dgc: errors ignored - not fatal and nowhere to report them */ |
| if (xfs_log_need_covered(mp)) |
| xfs_fs_log_dummy(mp); |
| else |
| xfs_log_force(mp, 0); |
| |
| /* start pushing all the metadata that is currently dirty */ |
| xfs_ail_push_all(mp->m_ail); |
| |
| /* queue us up again */ |
| xfs_log_work_queue(mp); |
| } |
| |
| /* |
| * This routine initializes some of the log structure for a given mount point. |
| * Its primary purpose is to fill in enough, so recovery can occur. However, |
| * some other stuff may be filled in too. |
| */ |
| STATIC struct xlog * |
| xlog_alloc_log( |
| struct xfs_mount *mp, |
| struct xfs_buftarg *log_target, |
| xfs_daddr_t blk_offset, |
| int num_bblks) |
| { |
| struct xlog *log; |
| xlog_rec_header_t *head; |
| xlog_in_core_t **iclogp; |
| xlog_in_core_t *iclog, *prev_iclog=NULL; |
| xfs_buf_t *bp; |
| int i; |
| int error = -ENOMEM; |
| uint log2_size = 0; |
| |
| log = kmem_zalloc(sizeof(struct xlog), KM_MAYFAIL); |
| if (!log) { |
| xfs_warn(mp, "Log allocation failed: No memory!"); |
| goto out; |
| } |
| |
| log->l_mp = mp; |
| log->l_targ = log_target; |
| log->l_logsize = BBTOB(num_bblks); |
| log->l_logBBstart = blk_offset; |
| log->l_logBBsize = num_bblks; |
| log->l_covered_state = XLOG_STATE_COVER_IDLE; |
| log->l_flags |= XLOG_ACTIVE_RECOVERY; |
| INIT_DELAYED_WORK(&log->l_work, xfs_log_worker); |
| |
| log->l_prev_block = -1; |
| /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ |
| xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0); |
| xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0); |
| log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ |
| |
| xlog_grant_head_init(&log->l_reserve_head); |
| xlog_grant_head_init(&log->l_write_head); |
| |
| error = -EFSCORRUPTED; |
| if (xfs_sb_version_hassector(&mp->m_sb)) { |
| log2_size = mp->m_sb.sb_logsectlog; |
| if (log2_size < BBSHIFT) { |
| xfs_warn(mp, "Log sector size too small (0x%x < 0x%x)", |
| log2_size, BBSHIFT); |
| goto out_free_log; |
| } |
| |
| log2_size -= BBSHIFT; |
| if (log2_size > mp->m_sectbb_log) { |
| xfs_warn(mp, "Log sector size too large (0x%x > 0x%x)", |
| log2_size, mp->m_sectbb_log); |
| goto out_free_log; |
| } |
| |
| /* for larger sector sizes, must have v2 or external log */ |
| if (log2_size && log->l_logBBstart > 0 && |
| !xfs_sb_version_haslogv2(&mp->m_sb)) { |
| xfs_warn(mp, |
| "log sector size (0x%x) invalid for configuration.", |
| log2_size); |
| goto out_free_log; |
| } |
| } |
| log->l_sectBBsize = 1 << log2_size; |
| |
| xlog_get_iclog_buffer_size(mp, log); |
| |
| /* |
| * Use a NULL block for the extra log buffer used during splits so that |
| * it will trigger errors if we ever try to do IO on it without first |
| * having set it up properly. |
| */ |
| error = -ENOMEM; |
| bp = xfs_buf_alloc(mp->m_logdev_targp, XFS_BUF_DADDR_NULL, |
| BTOBB(log->l_iclog_size), 0); |
| if (!bp) |
| goto out_free_log; |
| |
| /* |
| * The iclogbuf buffer locks are held over IO but we are not going to do |
| * IO yet. Hence unlock the buffer so that the log IO path can grab it |
| * when appropriately. |
| */ |
| ASSERT(xfs_buf_islocked(bp)); |
| xfs_buf_unlock(bp); |
| |
| bp->b_iodone = xlog_iodone; |
| log->l_xbuf = bp; |
| |
| spin_lock_init(&log->l_icloglock); |
| init_waitqueue_head(&log->l_flush_wait); |
| |
| iclogp = &log->l_iclog; |
| /* |
| * The amount of memory to allocate for the iclog structure is |
| * rather funky due to the way the structure is defined. It is |
| * done this way so that we can use different sizes for machines |
| * with different amounts of memory. See the definition of |
| * xlog_in_core_t in xfs_log_priv.h for details. |
| */ |
| ASSERT(log->l_iclog_size >= 4096); |
| for (i=0; i < log->l_iclog_bufs; i++) { |
| *iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL); |
| if (!*iclogp) |
| goto out_free_iclog; |
| |
| iclog = *iclogp; |
| iclog->ic_prev = prev_iclog; |
| prev_iclog = iclog; |
| |
| bp = xfs_buf_get_uncached(mp->m_logdev_targp, |
| BTOBB(log->l_iclog_size), 0); |
| if (!bp) |
| goto out_free_iclog; |
| |
| ASSERT(xfs_buf_islocked(bp)); |
| xfs_buf_unlock(bp); |
| |
| bp->b_iodone = xlog_iodone; |
| iclog->ic_bp = bp; |
| iclog->ic_data = bp->b_addr; |
| #ifdef DEBUG |
| log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); |
| #endif |
| head = &iclog->ic_header; |
| memset(head, 0, sizeof(xlog_rec_header_t)); |
| head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); |
| head->h_version = cpu_to_be32( |
| xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); |
| head->h_size = cpu_to_be32(log->l_iclog_size); |
| /* new fields */ |
| head->h_fmt = cpu_to_be32(XLOG_FMT); |
| memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); |
| |
| iclog->ic_size = BBTOB(bp->b_length) - log->l_iclog_hsize; |
| iclog->ic_state = XLOG_STATE_ACTIVE; |
| iclog->ic_log = log; |
| atomic_set(&iclog->ic_refcnt, 0); |
| spin_lock_init(&iclog->ic_callback_lock); |
| iclog->ic_callback_tail = &(iclog->ic_callback); |
| iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; |
| |
| init_waitqueue_head(&iclog->ic_force_wait); |
| init_waitqueue_head(&iclog->ic_write_wait); |
| |
| iclogp = &iclog->ic_next; |
| } |
| *iclogp = log->l_iclog; /* complete ring */ |
| log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ |
| |
| error = xlog_cil_init(log); |
| if (error) |
| goto out_free_iclog; |
| return log; |
| |
| out_free_iclog: |
| for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { |
| prev_iclog = iclog->ic_next; |
| if (iclog->ic_bp) |
| xfs_buf_free(iclog->ic_bp); |
| kmem_free(iclog); |
| } |
| spinlock_destroy(&log->l_icloglock); |
| xfs_buf_free(log->l_xbuf); |
| out_free_log: |
| kmem_free(log); |
| out: |
| return ERR_PTR(error); |
| } /* xlog_alloc_log */ |
| |
| |
| /* |
| * Write out the commit record of a transaction associated with the given |
| * ticket. Return the lsn of the commit record. |
| */ |
| STATIC int |
| xlog_commit_record( |
| struct xlog *log, |
| struct xlog_ticket *ticket, |
| struct xlog_in_core **iclog, |
| xfs_lsn_t *commitlsnp) |
| { |
| struct xfs_mount *mp = log->l_mp; |
| int error; |
| struct xfs_log_iovec reg = { |
| .i_addr = NULL, |
| .i_len = 0, |
| .i_type = XLOG_REG_TYPE_COMMIT, |
| }; |
| struct xfs_log_vec vec = { |
| .lv_niovecs = 1, |
| .lv_iovecp = ®, |
| }; |
| |
| ASSERT_ALWAYS(iclog); |
| error = xlog_write(log, &vec, ticket, commitlsnp, iclog, |
| XLOG_COMMIT_TRANS); |
| if (error) |
| xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
| return error; |
| } |
| |
| /* |
| * Push on the buffer cache code if we ever use more than 75% of the on-disk |
| * log space. This code pushes on the lsn which would supposedly free up |
| * the 25% which we want to leave free. We may need to adopt a policy which |
| * pushes on an lsn which is further along in the log once we reach the high |
| * water mark. In this manner, we would be creating a low water mark. |
| */ |
| STATIC void |
| xlog_grant_push_ail( |
| struct xlog *log, |
| int need_bytes) |
| { |
| xfs_lsn_t threshold_lsn = 0; |
| xfs_lsn_t last_sync_lsn; |
| int free_blocks; |
| int free_bytes; |
| int threshold_block; |
| int threshold_cycle; |
| int free_threshold; |
| |
| ASSERT(BTOBB(need_bytes) < log->l_logBBsize); |
| |
| free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); |
| free_blocks = BTOBBT(free_bytes); |
| |
| /* |
| * Set the threshold for the minimum number of free blocks in the |
| * log to the maximum of what the caller needs, one quarter of the |
| * log, and 256 blocks. |
| */ |
| free_threshold = BTOBB(need_bytes); |
| free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); |
| free_threshold = MAX(free_threshold, 256); |
| if (free_blocks >= free_threshold) |
| return; |
| |
| xlog_crack_atomic_lsn(&log->l_tail_lsn, &threshold_cycle, |
| &threshold_block); |
| threshold_block += free_threshold; |
| if (threshold_block >= log->l_logBBsize) { |
| threshold_block -= log->l_logBBsize; |
| threshold_cycle += 1; |
| } |
| threshold_lsn = xlog_assign_lsn(threshold_cycle, |
| threshold_block); |
| /* |
| * Don't pass in an lsn greater than the lsn of the last |
| * log record known to be on disk. Use a snapshot of the last sync lsn |
| * so that it doesn't change between the compare and the set. |
| */ |
| last_sync_lsn = atomic64_read(&log->l_last_sync_lsn); |
| if (XFS_LSN_CMP(threshold_lsn, last_sync_lsn) > 0) |
| threshold_lsn = last_sync_lsn; |
| |
| /* |
| * Get the transaction layer to kick the dirty buffers out to |
| * disk asynchronously. No point in trying to do this if |
| * the filesystem is shutting down. |
| */ |
| if (!XLOG_FORCED_SHUTDOWN(log)) |
| xfs_ail_push(log->l_ailp, threshold_lsn); |
| } |
| |
| /* |
| * Stamp cycle number in every block |
| */ |
| STATIC void |
| xlog_pack_data( |
| struct xlog *log, |
| struct xlog_in_core *iclog, |
| int roundoff) |
| { |
| int i, j, k; |
| int size = iclog->ic_offset + roundoff; |
| __be32 cycle_lsn; |
| xfs_caddr_t dp; |
| |
| cycle_lsn = CYCLE_LSN_DISK(iclog->ic_header.h_lsn); |
| |
| dp = iclog->ic_datap; |
| for (i = 0; i < BTOBB(size); i++) { |
| if (i >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) |
| break; |
| iclog->ic_header.h_cycle_data[i] = *(__be32 *)dp; |
| *(__be32 *)dp = cycle_lsn; |
| dp += BBSIZE; |
| } |
| |
| if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { |
| xlog_in_core_2_t *xhdr = iclog->ic_data; |
| |
| for ( ; i < BTOBB(size); i++) { |
| j = i / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); |
| k = i % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); |
| xhdr[j].hic_xheader.xh_cycle_data[k] = *(__be32 *)dp; |
| *(__be32 *)dp = cycle_lsn; |
| dp += BBSIZE; |
| } |
| |
| for (i = 1; i < log->l_iclog_heads; i++) |
| xhdr[i].hic_xheader.xh_cycle = cycle_lsn; |
| } |
| } |
| |
| /* |
| * Calculate the checksum for a log buffer. |
| * |
| * This is a little more complicated than it should be because the various |
| * headers and the actual data are non-contiguous. |
| */ |
| __le32 |
| xlog_cksum( |
| struct xlog *log, |
| struct xlog_rec_header *rhead, |
| char *dp, |
| int size) |
| { |
| __uint32_t crc; |
| |
| /* first generate the crc for the record header ... */ |
| crc = xfs_start_cksum((char *)rhead, |
| sizeof(struct xlog_rec_header), |
| offsetof(struct xlog_rec_header, h_crc)); |
| |
| /* ... then for additional cycle data for v2 logs ... */ |
| if (xfs_sb_version_haslogv2(&log->l_mp->m_sb)) { |
| union xlog_in_core2 *xhdr = (union xlog_in_core2 *)rhead; |
| int i; |
| |
| for (i = 1; i < log->l_iclog_heads; i++) { |
| crc = crc32c(crc, &xhdr[i].hic_xheader, |
| sizeof(struct xlog_rec_ext_header)); |
| } |
| } |
| |
| /* ... and finally for the payload */ |
| crc = crc32c(crc, dp, size); |
| |
| return xfs_end_cksum(crc); |
| } |
| |
| /* |
| * The bdstrat callback function for log bufs. This gives us a central |
| * place to trap bufs in case we get hit by a log I/O error and need to |
| * shutdown. Actually, in practice, even when we didn't get a log error, |
| * we transition the iclogs to IOERROR state *after* flushing all existing |
| * iclogs to disk. This is because we don't want anymore new transactions to be |
| * started or completed afterwards. |
| * |
| * We lock the iclogbufs here so that we can serialise against IO completion |
| * during unmount. We might be processing a shutdown triggered during unmount, |
| * and that can occur asynchronously to the unmount thread, and hence we need to |
| * ensure that completes before tearing down the iclogbufs. Hence we need to |
| * hold the buffer lock across the log IO to acheive that. |
| */ |
| STATIC int |
| xlog_bdstrat( |
| struct xfs_buf *bp) |
| { |
| struct xlog_in_core *iclog = bp->b_fspriv; |
| |
| xfs_buf_lock(bp); |
| if (iclog->ic_state & XLOG_STATE_IOERROR) { |
| xfs_buf_ioerror(bp, -EIO); |
| xfs_buf_stale(bp); |
| xfs_buf_ioend(bp); |
| /* |
| * It would seem logical to return EIO here, but we rely on |
| * the log state machine to propagate I/O errors instead of |
| * doing it here. Similarly, IO completion will unlock the |
| * buffer, so we don't do it here. |
| */ |
| return 0; |
| } |
| |
| xfs_buf_iorequest(bp); |
| return 0; |
| } |
| |
| /* |
| * Flush out the in-core log (iclog) to the on-disk log in an asynchronous |
| * fashion. Previously, we should have moved the current iclog |
| * ptr in the log to point to the next available iclog. This allows further |
| * write to continue while this code syncs out an iclog ready to go. |
| * Before an in-core log can be written out, the data section must be scanned |
| * to save away the 1st word of each BBSIZE block into the header. We replace |
| * it with the current cycle count. Each BBSIZE block is tagged with the |
| * cycle count because there in an implicit assumption that drives will |
| * guarantee that entire 512 byte blocks get written at once. In other words, |
| * we can't have part of a 512 byte block written and part not written. By |
| * tagging each block, we will know which blocks are valid when recovering |
| * after an unclean shutdown. |
| * |
| * This routine is single threaded on the iclog. No other thread can be in |
| * this routine with the same iclog. Changing contents of iclog can there- |
| * fore be done without grabbing the state machine lock. Updating the global |
| * log will require grabbing the lock though. |
| * |
| * The entire log manager uses a logical block numbering scheme. Only |
| * log_sync (and then only bwrite()) know about the fact that the log may |
| * not start with block zero on a given device. The log block start offset |
| * is added immediately before calling bwrite(). |
| */ |
| |
| STATIC int |
| xlog_sync( |
| struct xlog *log, |
| struct xlog_in_core *iclog) |
| { |
| xfs_buf_t *bp; |
| int i; |
| uint count; /* byte count of bwrite */ |
| uint count_init; /* initial count before roundup */ |
| int roundoff; /* roundoff to BB or stripe */ |
| int split = 0; /* split write into two regions */ |
| int error; |
| int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb); |
| int size; |
| |
| XFS_STATS_INC(xs_log_writes); |
| ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
| |
| /* Add for LR header */ |
| count_init = log->l_iclog_hsize + iclog->ic_offset; |
| |
| /* Round out the log write size */ |
| if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { |
| /* we have a v2 stripe unit to use */ |
| count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); |
| } else { |
| count = BBTOB(BTOBB(count_init)); |
| } |
| roundoff = count - count_init; |
| ASSERT(roundoff >= 0); |
| ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && |
| roundoff < log->l_mp->m_sb.sb_logsunit) |
| || |
| (log->l_mp->m_sb.sb_logsunit <= 1 && |
| roundoff < BBTOB(1))); |
| |
| /* move grant heads by roundoff in sync */ |
| xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff); |
| xlog_grant_add_space(log, &log->l_write_head.grant, roundoff); |
| |
| /* put cycle number in every block */ |
| xlog_pack_data(log, iclog, roundoff); |
| |
| /* real byte length */ |
| size = iclog->ic_offset; |
| if (v2) |
| size += roundoff; |
| iclog->ic_header.h_len = cpu_to_be32(size); |
| |
| bp = iclog->ic_bp; |
| XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn))); |
| |
| XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); |
| |
| /* Do we need to split this write into 2 parts? */ |
| if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { |
| char *dptr; |
| |
| split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); |
| count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); |
| iclog->ic_bwritecnt = 2; |
| |
| /* |
| * Bump the cycle numbers at the start of each block in the |
| * part of the iclog that ends up in the buffer that gets |
| * written to the start of the log. |
| * |
| * Watch out for the header magic number case, though. |
| */ |
| dptr = (char *)&iclog->ic_header + count; |
| for (i = 0; i < split; i += BBSIZE) { |
| __uint32_t cycle = be32_to_cpu(*(__be32 *)dptr); |
| if (++cycle == XLOG_HEADER_MAGIC_NUM) |
| cycle++; |
| *(__be32 *)dptr = cpu_to_be32(cycle); |
| |
| dptr += BBSIZE; |
| } |
| } else { |
| iclog->ic_bwritecnt = 1; |
| } |
| |
| /* calculcate the checksum */ |
| iclog->ic_header.h_crc = xlog_cksum(log, &iclog->ic_header, |
| iclog->ic_datap, size); |
| |
| bp->b_io_length = BTOBB(count); |
| bp->b_fspriv = iclog; |
| XFS_BUF_ZEROFLAGS(bp); |
| XFS_BUF_ASYNC(bp); |
| bp->b_flags |= XBF_SYNCIO; |
| |
| if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) { |
| bp->b_flags |= XBF_FUA; |
| |
| /* |
| * Flush the data device before flushing the log to make |
| * sure all meta data written back from the AIL actually made |
| * it to disk before stamping the new log tail LSN into the |
| * log buffer. For an external log we need to issue the |
| * flush explicitly, and unfortunately synchronously here; |
| * for an internal log we can simply use the block layer |
| * state machine for preflushes. |
| */ |
| if (log->l_mp->m_logdev_targp != log->l_mp->m_ddev_targp) |
| xfs_blkdev_issue_flush(log->l_mp->m_ddev_targp); |
| else |
| bp->b_flags |= XBF_FLUSH; |
| } |
| |
| ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); |
| ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); |
| |
| xlog_verify_iclog(log, iclog, count, true); |
| |
| /* account for log which doesn't start at block #0 */ |
| XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); |
| /* |
| * Don't call xfs_bwrite here. We do log-syncs even when the filesystem |
| * is shutting down. |
| */ |
| XFS_BUF_WRITE(bp); |
| |
| error = xlog_bdstrat(bp); |
| if (error) { |
| xfs_buf_ioerror_alert(bp, "xlog_sync"); |
| return error; |
| } |
| if (split) { |
| bp = iclog->ic_log->l_xbuf; |
| XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ |
| xfs_buf_associate_memory(bp, |
| (char *)&iclog->ic_header + count, split); |
| bp->b_fspriv = iclog; |
| XFS_BUF_ZEROFLAGS(bp); |
| XFS_BUF_ASYNC(bp); |
| bp->b_flags |= XBF_SYNCIO; |
| if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) |
| bp->b_flags |= XBF_FUA; |
| |
| ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); |
| ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); |
| |
| /* account for internal log which doesn't start at block #0 */ |
| XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); |
| XFS_BUF_WRITE(bp); |
| error = xlog_bdstrat(bp); |
| if (error) { |
| xfs_buf_ioerror_alert(bp, "xlog_sync (split)"); |
| return error; |
| } |
| } |
| return 0; |
| } /* xlog_sync */ |
| |
| /* |
| * Deallocate a log structure |
| */ |
| STATIC void |
| xlog_dealloc_log( |
| struct xlog *log) |
| { |
| xlog_in_core_t *iclog, *next_iclog; |
| int i; |
| |
| xlog_cil_destroy(log); |
| |
| /* |
| * Cycle all the iclogbuf locks to make sure all log IO completion |
| * is done before we tear down these buffers. |
| */ |
| iclog = log->l_iclog; |
| for (i = 0; i < log->l_iclog_bufs; i++) { |
| xfs_buf_lock(iclog->ic_bp); |
| xfs_buf_unlock(iclog->ic_bp); |
| iclog = iclog->ic_next; |
| } |
| |
| /* |
| * Always need to ensure that the extra buffer does not point to memory |
| * owned by another log buffer before we free it. Also, cycle the lock |
| * first to ensure we've completed IO on it. |
| */ |
| xfs_buf_lock(log->l_xbuf); |
| xfs_buf_unlock(log->l_xbuf); |
| xfs_buf_set_empty(log->l_xbuf, BTOBB(log->l_iclog_size)); |
| xfs_buf_free(log->l_xbuf); |
| |
| iclog = log->l_iclog; |
| for (i = 0; i < log->l_iclog_bufs; i++) { |
| xfs_buf_free(iclog->ic_bp); |
| next_iclog = iclog->ic_next; |
| kmem_free(iclog); |
| iclog = next_iclog; |
| } |
| spinlock_destroy(&log->l_icloglock); |
| |
| log->l_mp->m_log = NULL; |
| kmem_free(log); |
| } /* xlog_dealloc_log */ |
| |
| /* |
| * Update counters atomically now that memcpy is done. |
| */ |
| /* ARGSUSED */ |
| static inline void |
| xlog_state_finish_copy( |
| struct xlog *log, |
| struct xlog_in_core *iclog, |
| int record_cnt, |
| int copy_bytes) |
| { |
| spin_lock(&log->l_icloglock); |
| |
| be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); |
| iclog->ic_offset += copy_bytes; |
| |
| spin_unlock(&log->l_icloglock); |
| } /* xlog_state_finish_copy */ |
| |
| |
| |
| |
| /* |
| * print out info relating to regions written which consume |
| * the reservation |
| */ |
| void |
| xlog_print_tic_res( |
| struct xfs_mount *mp, |
| struct xlog_ticket *ticket) |
| { |
| uint i; |
| uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); |
| |
| /* match with XLOG_REG_TYPE_* in xfs_log.h */ |
| static char *res_type_str[XLOG_REG_TYPE_MAX] = { |
| "bformat", |
| "bchunk", |
| "efi_format", |
| "efd_format", |
| "iformat", |
| "icore", |
| "iext", |
| "ibroot", |
| "ilocal", |
| "iattr_ext", |
| "iattr_broot", |
| "iattr_local", |
| "qformat", |
| "dquot", |
| "quotaoff", |
| "LR header", |
| "unmount", |
| "commit", |
| "trans header" |
| }; |
| static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { |
| "SETATTR_NOT_SIZE", |
| "SETATTR_SIZE", |
| "INACTIVE", |
| "CREATE", |
| "CREATE_TRUNC", |
| "TRUNCATE_FILE", |
| "REMOVE", |
| "LINK", |
| "RENAME", |
| "MKDIR", |
| "RMDIR", |
| "SYMLINK", |
| "SET_DMATTRS", |
| "GROWFS", |
| "STRAT_WRITE", |
| "DIOSTRAT", |
| "WRITE_SYNC", |
| "WRITEID", |
| "ADDAFORK", |
| "ATTRINVAL", |
| "ATRUNCATE", |
| "ATTR_SET", |
| "ATTR_RM", |
| "ATTR_FLAG", |
| "CLEAR_AGI_BUCKET", |
| "QM_SBCHANGE", |
| "DUMMY1", |
| "DUMMY2", |
| "QM_QUOTAOFF", |
| "QM_DQALLOC", |
| "QM_SETQLIM", |
| "QM_DQCLUSTER", |
| "QM_QINOCREATE", |
| "QM_QUOTAOFF_END", |
| "SB_UNIT", |
| "FSYNC_TS", |
| "GROWFSRT_ALLOC", |
| "GROWFSRT_ZERO", |
| "GROWFSRT_FREE", |
| "SWAPEXT" |
| }; |
| |
| xfs_warn(mp, |
| "xlog_write: reservation summary:\n" |
| " trans type = %s (%u)\n" |
| " unit res = %d bytes\n" |
| " current res = %d bytes\n" |
| " total reg = %u bytes (o/flow = %u bytes)\n" |
| " ophdrs = %u (ophdr space = %u bytes)\n" |
| " ophdr + reg = %u bytes\n" |
| " num regions = %u\n", |
| ((ticket->t_trans_type <= 0 || |
| ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? |
| "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), |
| ticket->t_trans_type, |
| ticket->t_unit_res, |
| ticket->t_curr_res, |
| ticket->t_res_arr_sum, ticket->t_res_o_flow, |
| ticket->t_res_num_ophdrs, ophdr_spc, |
| ticket->t_res_arr_sum + |
| ticket->t_res_o_flow + ophdr_spc, |
| ticket->t_res_num); |
| |
| for (i = 0; i < ticket->t_res_num; i++) { |
| uint r_type = ticket->t_res_arr[i].r_type; |
| xfs_warn(mp, "region[%u]: %s - %u bytes", i, |
| ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? |
| "bad-rtype" : res_type_str[r_type-1]), |
| ticket->t_res_arr[i].r_len); |
| } |
| |
| xfs_alert_tag(mp, XFS_PTAG_LOGRES, |
| "xlog_write: reservation ran out. Need to up reservation"); |
| xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
| } |
| |
| /* |
| * Calculate the potential space needed by the log vector. Each region gets |
| * its own xlog_op_header_t and may need to be double word aligned. |
| */ |
| static int |
| xlog_write_calc_vec_length( |
| struct xlog_ticket *ticket, |
| struct xfs_log_vec *log_vector) |
| { |
| struct xfs_log_vec *lv; |
| int headers = 0; |
| int len = 0; |
| int i; |
| |
| /* acct for start rec of xact */ |
| if (ticket->t_flags & XLOG_TIC_INITED) |
| headers++; |
| |
| for (lv = log_vector; lv; lv = lv->lv_next) { |
| /* we don't write ordered log vectors */ |
| if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) |
| continue; |
| |
| headers += lv->lv_niovecs; |
| |
| for (i = 0; i < lv->lv_niovecs; i++) { |
| struct xfs_log_iovec *vecp = &lv->lv_iovecp[i]; |
| |
| len += vecp->i_len; |
| xlog_tic_add_region(ticket, vecp->i_len, vecp->i_type); |
| } |
| } |
| |
| ticket->t_res_num_ophdrs += headers; |
| len += headers * sizeof(struct xlog_op_header); |
| |
| return len; |
| } |
| |
| /* |
| * If first write for transaction, insert start record We can't be trying to |
| * commit if we are inited. We can't have any "partial_copy" if we are inited. |
| */ |
| static int |
| xlog_write_start_rec( |
| struct xlog_op_header *ophdr, |
| struct xlog_ticket *ticket) |
| { |
| if (!(ticket->t_flags & XLOG_TIC_INITED)) |
| return 0; |
| |
| ophdr->oh_tid = cpu_to_be32(ticket->t_tid); |
| ophdr->oh_clientid = ticket->t_clientid; |
| ophdr->oh_len = 0; |
| ophdr->oh_flags = XLOG_START_TRANS; |
| ophdr->oh_res2 = 0; |
| |
| ticket->t_flags &= ~XLOG_TIC_INITED; |
| |
| return sizeof(struct xlog_op_header); |
| } |
| |
| static xlog_op_header_t * |
| xlog_write_setup_ophdr( |
| struct xlog *log, |
| struct xlog_op_header *ophdr, |
| struct xlog_ticket *ticket, |
| uint flags) |
| { |
| ophdr->oh_tid = cpu_to_be32(ticket->t_tid); |
| ophdr->oh_clientid = ticket->t_clientid; |
| ophdr->oh_res2 = 0; |
| |
| /* are we copying a commit or unmount record? */ |
| ophdr->oh_flags = flags; |
| |
| /* |
| * We've seen logs corrupted with bad transaction client ids. This |
| * makes sure that XFS doesn't generate them on. Turn this into an EIO |
| * and shut down the filesystem. |
| */ |
| switch (ophdr->oh_clientid) { |
| case XFS_TRANSACTION: |
| case XFS_VOLUME: |
| case XFS_LOG: |
| break; |
| default: |
| xfs_warn(log->l_mp, |
| "Bad XFS transaction clientid 0x%x in ticket 0x%p", |
| ophdr->oh_clientid, ticket); |
| return NULL; |
| } |
| |
| return ophdr; |
| } |
| |
| /* |
| * Set up the parameters of the region copy into the log. This has |
| * to handle region write split across multiple log buffers - this |
| * state is kept external to this function so that this code can |
| * be written in an obvious, self documenting manner. |
| */ |
| static int |
| xlog_write_setup_copy( |
| struct xlog_ticket *ticket, |
| struct xlog_op_header *ophdr, |
| int space_available, |
| int space_required, |
| int *copy_off, |
| int *copy_len, |
| int *last_was_partial_copy, |
| int *bytes_consumed) |
| { |
| int still_to_copy; |
| |
| still_to_copy = space_required - *bytes_consumed; |
| *copy_off = *bytes_consumed; |
| |
| if (still_to_copy <= space_available) { |
| /* write of region completes here */ |
| *copy_len = still_to_copy; |
| ophdr->oh_len = cpu_to_be32(*copy_len); |
| if (*last_was_partial_copy) |
| ophdr->oh_flags |= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); |
| *last_was_partial_copy = 0; |
| *bytes_consumed = 0; |
| return 0; |
| } |
| |
| /* partial write of region, needs extra log op header reservation */ |
| *copy_len = space_available; |
| ophdr->oh_len = cpu_to_be32(*copy_len); |
| ophdr->oh_flags |= XLOG_CONTINUE_TRANS; |
| if (*last_was_partial_copy) |
| ophdr->oh_flags |= XLOG_WAS_CONT_TRANS; |
| *bytes_consumed += *copy_len; |
| (*last_was_partial_copy)++; |
| |
| /* account for new log op header */ |
| ticket->t_curr_res -= sizeof(struct xlog_op_header); |
| ticket->t_res_num_ophdrs++; |
| |
| return sizeof(struct xlog_op_header); |
| } |
| |
| static int |
| xlog_write_copy_finish( |
| struct xlog *log, |
| struct xlog_in_core *iclog, |
| uint flags, |
| int *record_cnt, |
| int *data_cnt, |
| int *partial_copy, |
| int *partial_copy_len, |
| int log_offset, |
| struct xlog_in_core **commit_iclog) |
| { |
| if (*partial_copy) { |
| /* |
| * This iclog has already been marked WANT_SYNC by |
| * xlog_state_get_iclog_space. |
| */ |
| xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); |
| *record_cnt = 0; |
| *data_cnt = 0; |
| return xlog_state_release_iclog(log, iclog); |
| } |
| |
| *partial_copy = 0; |
| *partial_copy_len = 0; |
| |
| if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { |
| /* no more space in this iclog - push it. */ |
| xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); |
| *record_cnt = 0; |
| *data_cnt = 0; |
| |
| spin_lock(&log->l_icloglock); |
| xlog_state_want_sync(log, iclog); |
| spin_unlock(&log->l_icloglock); |
| |
| if (!commit_iclog) |
| return xlog_state_release_iclog(log, iclog); |
| ASSERT(flags & XLOG_COMMIT_TRANS); |
| *commit_iclog = iclog; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Write some region out to in-core log |
| * |
| * This will be called when writing externally provided regions or when |
| * writing out a commit record for a given transaction. |
| * |
| * General algorithm: |
| * 1. Find total length of this write. This may include adding to the |
| * lengths passed in. |
| * 2. Check whether we violate the tickets reservation. |
| * 3. While writing to this iclog |
| * A. Reserve as much space in this iclog as can get |
| * B. If this is first write, save away start lsn |
| * C. While writing this region: |
| * 1. If first write of transaction, write start record |
| * 2. Write log operation header (header per region) |
| * 3. Find out if we can fit entire region into this iclog |
| * 4. Potentially, verify destination memcpy ptr |
| * 5. Memcpy (partial) region |
| * 6. If partial copy, release iclog; otherwise, continue |
| * copying more regions into current iclog |
| * 4. Mark want sync bit (in simulation mode) |
| * 5. Release iclog for potential flush to on-disk log. |
| * |
| * ERRORS: |
| * 1. Panic if reservation is overrun. This should never happen since |
| * reservation amounts are generated internal to the filesystem. |
| * NOTES: |
| * 1. Tickets are single threaded data structures. |
| * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the |
| * syncing routine. When a single log_write region needs to span |
| * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set |
| * on all log operation writes which don't contain the end of the |
| * region. The XLOG_END_TRANS bit is used for the in-core log |
| * operation which contains the end of the continued log_write region. |
| * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, |
| * we don't really know exactly how much space will be used. As a result, |
| * we don't update ic_offset until the end when we know exactly how many |
| * bytes have been written out. |
| */ |
| int |
| xlog_write( |
| struct xlog *log, |
| struct xfs_log_vec *log_vector, |
| struct xlog_ticket *ticket, |
| xfs_lsn_t *start_lsn, |
| struct xlog_in_core **commit_iclog, |
| uint flags) |
| { |
| struct xlog_in_core *iclog = NULL; |
| struct xfs_log_iovec *vecp; |
| struct xfs_log_vec *lv; |
| int len; |
| int index; |
| int partial_copy = 0; |
| int partial_copy_len = 0; |
| int contwr = 0; |
| int record_cnt = 0; |
| int data_cnt = 0; |
| int error; |
| |
| *start_lsn = 0; |
| |
| len = xlog_write_calc_vec_length(ticket, log_vector); |
| |
| /* |
| * Region headers and bytes are already accounted for. |
| * We only need to take into account start records and |
| * split regions in this function. |
| */ |
| if (ticket->t_flags & XLOG_TIC_INITED) |
| ticket->t_curr_res -= sizeof(xlog_op_header_t); |
| |
| /* |
| * Commit record headers need to be accounted for. These |
| * come in as separate writes so are easy to detect. |
| */ |
| if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS)) |
| ticket->t_curr_res -= sizeof(xlog_op_header_t); |
| |
| if (ticket->t_curr_res < 0) |
| xlog_print_tic_res(log->l_mp, ticket); |
| |
| index = 0; |
| lv = log_vector; |
| vecp = lv->lv_iovecp; |
| while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { |
| void *ptr; |
| int log_offset; |
| |
| error = xlog_state_get_iclog_space(log, len, &iclog, ticket, |
| &contwr, &log_offset); |
| if (error) |
| return error; |
| |
| ASSERT(log_offset <= iclog->ic_size - 1); |
| ptr = iclog->ic_datap + log_offset; |
| |
| /* start_lsn is the first lsn written to. That's all we need. */ |
| if (!*start_lsn) |
| *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
| |
| /* |
| * This loop writes out as many regions as can fit in the amount |
| * of space which was allocated by xlog_state_get_iclog_space(). |
| */ |
| while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { |
| struct xfs_log_iovec *reg; |
| struct xlog_op_header *ophdr; |
| int start_rec_copy; |
| int copy_len; |
| int copy_off; |
| bool ordered = false; |
| |
| /* ordered log vectors have no regions to write */ |
| if (lv->lv_buf_len == XFS_LOG_VEC_ORDERED) { |
| ASSERT(lv->lv_niovecs == 0); |
| ordered = true; |
| goto next_lv; |
| } |
| |
| reg = &vecp[index]; |
| ASSERT(reg->i_len % sizeof(__int32_t) == 0); |
| ASSERT((unsigned long)ptr % sizeof(__int32_t) == 0); |
| |
| start_rec_copy = xlog_write_start_rec(ptr, ticket); |
| if (start_rec_copy) { |
| record_cnt++; |
| xlog_write_adv_cnt(&ptr, &len, &log_offset, |
| start_rec_copy); |
| } |
| |
| ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags); |
| if (!ophdr) |
| return -EIO; |
| |
| xlog_write_adv_cnt(&ptr, &len, &log_offset, |
| sizeof(struct xlog_op_header)); |
| |
| len += xlog_write_setup_copy(ticket, ophdr, |
| iclog->ic_size-log_offset, |
| reg->i_len, |
| ©_off, ©_len, |
| &partial_copy, |
| &partial_copy_len); |
| xlog_verify_dest_ptr(log, ptr); |
| |
| /* copy region */ |
| ASSERT(copy_len >= 0); |
| memcpy(ptr, reg->i_addr + copy_off, copy_len); |
| xlog_write_adv_cnt(&ptr, &len, &log_offset, copy_len); |
| |
| copy_len += start_rec_copy + sizeof(xlog_op_header_t); |
| record_cnt++; |
| data_cnt += contwr ? copy_len : 0; |
| |
| error = xlog_write_copy_finish(log, iclog, flags, |
| &record_cnt, &data_cnt, |
| &partial_copy, |
| &partial_copy_len, |
| log_offset, |
| commit_iclog); |
| if (error) |
| return error; |
| |
| /* |
| * if we had a partial copy, we need to get more iclog |
| * space but we don't want to increment the region |
| * index because there is still more is this region to |
| * write. |
| * |
| * If we completed writing this region, and we flushed |
| * the iclog (indicated by resetting of the record |
| * count), then we also need to get more log space. If |
| * this was the last record, though, we are done and |
| * can just return. |
| */ |
| if (partial_copy) |
| break; |
| |
| if (++index == lv->lv_niovecs) { |
| next_lv: |
| lv = lv->lv_next; |
| index = 0; |
| if (lv) |
| vecp = lv->lv_iovecp; |
| } |
| if (record_cnt == 0 && ordered == false) { |
| if (!lv) |
| return 0; |
| break; |
| } |
| } |
| } |
| |
| ASSERT(len == 0); |
| |
| xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); |
| if (!commit_iclog) |
| return xlog_state_release_iclog(log, iclog); |
| |
| ASSERT(flags & XLOG_COMMIT_TRANS); |
| *commit_iclog = iclog; |
| return 0; |
| } |
| |
| |
| /***************************************************************************** |
| * |
| * State Machine functions |
| * |
| ***************************************************************************** |
| */ |
| |
| /* Clean iclogs starting from the head. This ordering must be |
| * maintained, so an iclog doesn't become ACTIVE beyond one that |
| * is SYNCING. This is also required to maintain the notion that we use |
| * a ordered wait queue to hold off would be writers to the log when every |
| * iclog is trying to sync to disk. |
| * |
| * State Change: DIRTY -> ACTIVE |
| */ |
| STATIC void |
| xlog_state_clean_log( |
| struct xlog *log) |
| { |
| xlog_in_core_t *iclog; |
| int changed = 0; |
| |
| iclog = log->l_iclog; |
| do { |
| if (iclog->ic_state == XLOG_STATE_DIRTY) { |
| iclog->ic_state = XLOG_STATE_ACTIVE; |
| iclog->ic_offset = 0; |
| ASSERT(iclog->ic_callback == NULL); |
| /* |
| * If the number of ops in this iclog indicate it just |
| * contains the dummy transaction, we can |
| * change state into IDLE (the second time around). |
| * Otherwise we should change the state into |
| * NEED a dummy. |
| * We don't need to cover the dummy. |
| */ |
| if (!changed && |
| (be32_to_cpu(iclog->ic_header.h_num_logops) == |
| XLOG_COVER_OPS)) { |
| changed = 1; |
| } else { |
| /* |
| * We have two dirty iclogs so start over |
| * This could also be num of ops indicates |
| * this is not the dummy going out. |
| */ |
| changed = 2; |
| } |
| iclog->ic_header.h_num_logops = 0; |
| memset(iclog->ic_header.h_cycle_data, 0, |
| sizeof(iclog->ic_header.h_cycle_data)); |
| iclog->ic_header.h_lsn = 0; |
| } else if (iclog->ic_state == XLOG_STATE_ACTIVE) |
| /* do nothing */; |
| else |
| break; /* stop cleaning */ |
| iclog = iclog->ic_next; |
| } while (iclog != log->l_iclog); |
| |
| /* log is locked when we are called */ |
| /* |
| * Change state for the dummy log recording. |
| * We usually go to NEED. But we go to NEED2 if the changed indicates |
| * we are done writing the dummy record. |
| * If we are done with the second dummy recored (DONE2), then |
| * we go to IDLE. |
| */ |
| if (changed) { |
| switch (log->l_covered_state) { |
| case XLOG_STATE_COVER_IDLE: |
| case XLOG_STATE_COVER_NEED: |
| case XLOG_STATE_COVER_NEED2: |
| log->l_covered_state = XLOG_STATE_COVER_NEED; |
| break; |
| |
| case XLOG_STATE_COVER_DONE: |
| if (changed == 1) |
| log->l_covered_state = XLOG_STATE_COVER_NEED2; |
| else |
| log->l_covered_state = XLOG_STATE_COVER_NEED; |
| break; |
| |
| case XLOG_STATE_COVER_DONE2: |
| if (changed == 1) |
| log->l_covered_state = XLOG_STATE_COVER_IDLE; |
| else |
| log->l_covered_state = XLOG_STATE_COVER_NEED; |
| break; |
| |
| default: |
| ASSERT(0); |
| } |
| } |
| } /* xlog_state_clean_log */ |
| |
| STATIC xfs_lsn_t |
| xlog_get_lowest_lsn( |
| struct xlog *log) |
| { |
| xlog_in_core_t *lsn_log; |
| xfs_lsn_t lowest_lsn, lsn; |
| |
| lsn_log = log->l_iclog; |
| lowest_lsn = 0; |
| do { |
| if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { |
| lsn = be64_to_cpu(lsn_log->ic_header.h_lsn); |
| if ((lsn && !lowest_lsn) || |
| (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { |
| lowest_lsn = lsn; |
| } |
| } |
| lsn_log = lsn_log->ic_next; |
| } while (lsn_log != log->l_iclog); |
| return lowest_lsn; |
| } |
| |
| |
| STATIC void |
| xlog_state_do_callback( |
| struct xlog *log, |
| int aborted, |
| struct xlog_in_core *ciclog) |
| { |
| xlog_in_core_t *iclog; |
| xlog_in_core_t *first_iclog; /* used to know when we've |
| * processed all iclogs once */ |
| xfs_log_callback_t *cb, *cb_next; |
| int flushcnt = 0; |
| xfs_lsn_t lowest_lsn; |
| int ioerrors; /* counter: iclogs with errors */ |
| int loopdidcallbacks; /* flag: inner loop did callbacks*/ |
| int funcdidcallbacks; /* flag: function did callbacks */ |
| int repeats; /* for issuing console warnings if |
| * looping too many times */ |
| int wake = 0; |
| |
| spin_lock(&log->l_icloglock); |
| first_iclog = iclog = log->l_iclog; |
| ioerrors = 0; |
| funcdidcallbacks = 0; |
| repeats = 0; |
| |
| do { |
| /* |
| * Scan all iclogs starting with the one pointed to by the |
| * log. Reset this starting point each time the log is |
| * unlocked (during callbacks). |
| * |
| * Keep looping through iclogs until one full pass is made |
| * without running any callbacks. |
| */ |
| first_iclog = log->l_iclog; |
| iclog = log->l_iclog; |
| loopdidcallbacks = 0; |
| repeats++; |
| |
| do { |
| |
| /* skip all iclogs in the ACTIVE & DIRTY states */ |
| if (iclog->ic_state & |
| (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { |
| iclog = iclog->ic_next; |
| continue; |
| } |
| |
| /* |
| * Between marking a filesystem SHUTDOWN and stopping |
| * the log, we do flush all iclogs to disk (if there |
| * wasn't a log I/O error). So, we do want things to |
| * go smoothly in case of just a SHUTDOWN w/o a |
| * LOG_IO_ERROR. |
| */ |
| if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { |
| /* |
| * Can only perform callbacks in order. Since |
| * this iclog is not in the DONE_SYNC/ |
| * DO_CALLBACK state, we skip the rest and |
| * just try to clean up. If we set our iclog |
| * to DO_CALLBACK, we will not process it when |
| * we retry since a previous iclog is in the |
| * CALLBACK and the state cannot change since |
| * we are holding the l_icloglock. |
| */ |
| if (!(iclog->ic_state & |
| (XLOG_STATE_DONE_SYNC | |
| XLOG_STATE_DO_CALLBACK))) { |
| if (ciclog && (ciclog->ic_state == |
| XLOG_STATE_DONE_SYNC)) { |
| ciclog->ic_state = XLOG_STATE_DO_CALLBACK; |
| } |
| break; |
| } |
| /* |
| * We now have an iclog that is in either the |
| * DO_CALLBACK or DONE_SYNC states. The other |
| * states (WANT_SYNC, SYNCING, or CALLBACK were |
| * caught by the above if and are going to |
| * clean (i.e. we aren't doing their callbacks) |
| * see the above if. |
| */ |
| |
| /* |
| * We will do one more check here to see if we |
| * have chased our tail around. |
| */ |
| |
| lowest_lsn = xlog_get_lowest_lsn(log); |
| if (lowest_lsn && |
| XFS_LSN_CMP(lowest_lsn, |
| be64_to_cpu(iclog->ic_header.h_lsn)) < 0) { |
| iclog = iclog->ic_next; |
| continue; /* Leave this iclog for |
| * another thread */ |
| } |
| |
| iclog->ic_state = XLOG_STATE_CALLBACK; |
| |
| |
| /* |
| * Completion of a iclog IO does not imply that |
| * a transaction has completed, as transactions |
| * can be large enough to span many iclogs. We |
| * cannot change the tail of the log half way |
| * through a transaction as this may be the only |
| * transaction in the log and moving th etail to |
| * point to the middle of it will prevent |
| * recovery from finding the start of the |
| * transaction. Hence we should only update the |
| * last_sync_lsn if this iclog contains |
| * transaction completion callbacks on it. |
| * |
| * We have to do this before we drop the |
| * icloglock to ensure we are the only one that |
| * can update it. |
| */ |
| ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), |
| be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); |
| if (iclog->ic_callback) |
| atomic64_set(&log->l_last_sync_lsn, |
| be64_to_cpu(iclog->ic_header.h_lsn)); |
| |
| } else |
| ioerrors++; |
| |
| spin_unlock(&log->l_icloglock); |
| |
| /* |
| * Keep processing entries in the callback list until |
| * we come around and it is empty. We need to |
| * atomically see that the list is empty and change the |
| * state to DIRTY so that we don't miss any more |
| * callbacks being added. |
| */ |
| spin_lock(&iclog->ic_callback_lock); |
| cb = iclog->ic_callback; |
| while (cb) { |
| iclog->ic_callback_tail = &(iclog->ic_callback); |
| iclog->ic_callback = NULL; |
| spin_unlock(&iclog->ic_callback_lock); |
| |
| /* perform callbacks in the order given */ |
| for (; cb; cb = cb_next) { |
| cb_next = cb->cb_next; |
| cb->cb_func(cb->cb_arg, aborted); |
| } |
| spin_lock(&iclog->ic_callback_lock); |
| cb = iclog->ic_callback; |
| } |
| |
| loopdidcallbacks++; |
| funcdidcallbacks++; |
| |
| spin_lock(&log->l_icloglock); |
| ASSERT(iclog->ic_callback == NULL); |
| spin_unlock(&iclog->ic_callback_lock); |
| if (!(iclog->ic_state & XLOG_STATE_IOERROR)) |
| iclog->ic_state = XLOG_STATE_DIRTY; |
| |
| /* |
| * Transition from DIRTY to ACTIVE if applicable. |
| * NOP if STATE_IOERROR. |
| */ |
| xlog_state_clean_log(log); |
| |
| /* wake up threads waiting in xfs_log_force() */ |
| wake_up_all(&iclog->ic_force_wait); |
| |
| iclog = iclog->ic_next; |
| } while (first_iclog != iclog); |
| |
| if (repeats > 5000) { |
| flushcnt += repeats; |
| repeats = 0; |
| xfs_warn(log->l_mp, |
| "%s: possible infinite loop (%d iterations)", |
| __func__, flushcnt); |
| } |
| } while (!ioerrors && loopdidcallbacks); |
| |
| /* |
| * make one last gasp attempt to see if iclogs are being left in |
| * limbo.. |
| */ |
| #ifdef DEBUG |
| if (funcdidcallbacks) { |
| first_iclog = iclog = log->l_iclog; |
| do { |
| ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); |
| /* |
| * Terminate the loop if iclogs are found in states |
| * which will cause other threads to clean up iclogs. |
| * |
| * SYNCING - i/o completion will go through logs |
| * DONE_SYNC - interrupt thread should be waiting for |
| * l_icloglock |
| * IOERROR - give up hope all ye who enter here |
| */ |
| if (iclog->ic_state == XLOG_STATE_WANT_SYNC || |
| iclog->ic_state == XLOG_STATE_SYNCING || |
| iclog->ic_state == XLOG_STATE_DONE_SYNC || |
| iclog->ic_state == XLOG_STATE_IOERROR ) |
| break; |
| iclog = iclog->ic_next; |
| } while (first_iclog != iclog); |
| } |
| #endif |
| |
| if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) |
| wake = 1; |
| spin_unlock(&log->l_icloglock); |
| |
| if (wake) |
| wake_up_all(&log->l_flush_wait); |
| } |
| |
| |
| /* |
| * Finish transitioning this iclog to the dirty state. |
| * |
| * Make sure that we completely execute this routine only when this is |
| * the last call to the iclog. There is a good chance that iclog flushes, |
| * when we reach the end of the physical log, get turned into 2 separate |
| * calls to bwrite. Hence, one iclog flush could generate two calls to this |
| * routine. By using the reference count bwritecnt, we guarantee that only |
| * the second completion goes through. |
| * |
| * Callbacks could take time, so they are done outside the scope of the |
| * global state machine log lock. |
| */ |
| STATIC void |
| xlog_state_done_syncing( |
| xlog_in_core_t *iclog, |
| int aborted) |
| { |
| struct xlog *log = iclog->ic_log; |
| |
| spin_lock(&log->l_icloglock); |
| |
| ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || |
| iclog->ic_state == XLOG_STATE_IOERROR); |
| ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
| ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); |
| |
| |
| /* |
| * If we got an error, either on the first buffer, or in the case of |
| * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, |
| * and none should ever be attempted to be written to disk |
| * again. |
| */ |
| if (iclog->ic_state != XLOG_STATE_IOERROR) { |
| if (--iclog->ic_bwritecnt == 1) { |
| spin_unlock(&log->l_icloglock); |
| return; |
| } |
| iclog->ic_state = XLOG_STATE_DONE_SYNC; |
| } |
| |
| /* |
| * Someone could be sleeping prior to writing out the next |
| * iclog buffer, we wake them all, one will get to do the |
| * I/O, the others get to wait for the result. |
| */ |
| wake_up_all(&iclog->ic_write_wait); |
| spin_unlock(&log->l_icloglock); |
| xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ |
| } /* xlog_state_done_syncing */ |
| |
| |
| /* |
| * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must |
| * sleep. We wait on the flush queue on the head iclog as that should be |
| * the first iclog to complete flushing. Hence if all iclogs are syncing, |
| * we will wait here and all new writes will sleep until a sync completes. |
| * |
| * The in-core logs are used in a circular fashion. They are not used |
| * out-of-order even when an iclog past the head is free. |
| * |
| * return: |
| * * log_offset where xlog_write() can start writing into the in-core |
| * log's data space. |
| * * in-core log pointer to which xlog_write() should write. |
| * * boolean indicating this is a continued write to an in-core log. |
| * If this is the last write, then the in-core log's offset field |
| * needs to be incremented, depending on the amount of data which |
| * is copied. |
| */ |
| STATIC int |
| xlog_state_get_iclog_space( |
| struct xlog *log, |
| int len, |
| struct xlog_in_core **iclogp, |
| struct xlog_ticket *ticket, |
| int *continued_write, |
| int *logoffsetp) |
| { |
| int log_offset; |
| xlog_rec_header_t *head; |
| xlog_in_core_t *iclog; |
| int error; |
| |
| restart: |
| spin_lock(&log->l_icloglock); |
| if (XLOG_FORCED_SHUTDOWN(log)) { |
| spin_unlock(&log->l_icloglock); |
| return -EIO; |
| } |
| |
| iclog = log->l_iclog; |
| if (iclog->ic_state != XLOG_STATE_ACTIVE) { |
| XFS_STATS_INC(xs_log_noiclogs); |
| |
| /* Wait for log writes to have flushed */ |
| xlog_wait(&log->l_flush_wait, &log->l_icloglock); |
| goto restart; |
| } |
| |
| head = &iclog->ic_header; |
| |
| atomic_inc(&iclog->ic_refcnt); /* prevents sync */ |
| log_offset = iclog->ic_offset; |
| |
| /* On the 1st write to an iclog, figure out lsn. This works |
| * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are |
| * committing to. If the offset is set, that's how many blocks |
| * must be written. |
| */ |
| if (log_offset == 0) { |
| ticket->t_curr_res -= log->l_iclog_hsize; |
| xlog_tic_add_region(ticket, |
| log->l_iclog_hsize, |
| XLOG_REG_TYPE_LRHEADER); |
| head->h_cycle = cpu_to_be32(log->l_curr_cycle); |
| head->h_lsn = cpu_to_be64( |
| xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); |
| ASSERT(log->l_curr_block >= 0); |
| } |
| |
| /* If there is enough room to write everything, then do it. Otherwise, |
| * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC |
| * bit is on, so this will get flushed out. Don't update ic_offset |
| * until you know exactly how many bytes get copied. Therefore, wait |
| * until later to update ic_offset. |
| * |
| * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's |
| * can fit into remaining data section. |
| */ |
| if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { |
| xlog_state_switch_iclogs(log, iclog, iclog->ic_size); |
| |
| /* |
| * If I'm the only one writing to this iclog, sync it to disk. |
| * We need to do an atomic compare and decrement here to avoid |
| * racing with concurrent atomic_dec_and_lock() calls in |
| * xlog_state_release_iclog() when there is more than one |
| * reference to the iclog. |
| */ |
| if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) { |
| /* we are the only one */ |
| spin_unlock(&log->l_icloglock); |
| error = xlog_state_release_iclog(log, iclog); |
| if (error) |
| return error; |
| } else { |
| spin_unlock(&log->l_icloglock); |
| } |
| goto restart; |
| } |
| |
| /* Do we have enough room to write the full amount in the remainder |
| * of this iclog? Or must we continue a write on the next iclog and |
| * mark this iclog as completely taken? In the case where we switch |
| * iclogs (to mark it taken), this particular iclog will release/sync |
| * to disk in xlog_write(). |
| */ |
| if (len <= iclog->ic_size - iclog->ic_offset) { |
| *continued_write = 0; |
| iclog->ic_offset += len; |
| } else { |
| *continued_write = 1; |
| xlog_state_switch_iclogs(log, iclog, iclog->ic_size); |
| } |
| *iclogp = iclog; |
| |
| ASSERT(iclog->ic_offset <= iclog->ic_size); |
| spin_unlock(&log->l_icloglock); |
| |
| *logoffsetp = log_offset; |
| return 0; |
| } /* xlog_state_get_iclog_space */ |
| |
| /* The first cnt-1 times through here we don't need to |
| * move the grant write head because the permanent |
| * reservation has reserved cnt times the unit amount. |
| * Release part of current permanent unit reservation and |
| * reset current reservation to be one units worth. Also |
| * move grant reservation head forward. |
| */ |
| STATIC void |
| xlog_regrant_reserve_log_space( |
| struct xlog *log, |
| struct xlog_ticket *ticket) |
| { |
| trace_xfs_log_regrant_reserve_enter(log, ticket); |
| |
| if (ticket->t_cnt > 0) |
| ticket->t_cnt--; |
| |
| xlog_grant_sub_space(log, &log->l_reserve_head.grant, |
| ticket->t_curr_res); |
| xlog_grant_sub_space(log, &log->l_write_head.grant, |
| ticket->t_curr_res); |
| ticket->t_curr_res = ticket->t_unit_res; |
| xlog_tic_reset_res(ticket); |
| |
| trace_xfs_log_regrant_reserve_sub(log, ticket); |
| |
| /* just return if we still have some of the pre-reserved space */ |
| if (ticket->t_cnt > 0) |
| return; |
| |
| xlog_grant_add_space(log, &log->l_reserve_head.grant, |
| ticket->t_unit_res); |
| |
| trace_xfs_log_regrant_reserve_exit(log, ticket); |
| |
| ticket->t_curr_res = ticket->t_unit_res; |
| xlog_tic_reset_res(ticket); |
| } /* xlog_regrant_reserve_log_space */ |
| |
| |
| /* |
| * Give back the space left from a reservation. |
| * |
| * All the information we need to make a correct determination of space left |
| * is present. For non-permanent reservations, things are quite easy. The |
| * count should have been decremented to zero. We only need to deal with the |
| * space remaining in the current reservation part of the ticket. If the |
| * ticket contains a permanent reservation, there may be left over space which |
| * needs to be released. A count of N means that N-1 refills of the current |
| * reservation can be done before we need to ask for more space. The first |
| * one goes to fill up the first current reservation. Once we run out of |
| * space, the count will stay at zero and the only space remaining will be |
| * in the current reservation field. |
| */ |
| STATIC void |
| xlog_ungrant_log_space( |
| struct xlog *log, |
| struct xlog_ticket *ticket) |
| { |
| int bytes; |
| |
| if (ticket->t_cnt > 0) |
| ticket->t_cnt--; |
| |
| trace_xfs_log_ungrant_enter(log, ticket); |
| trace_xfs_log_ungrant_sub(log, ticket); |
| |
| /* |
| * If this is a permanent reservation ticket, we may be able to free |
| * up more space based on the remaining count. |
| */ |
| bytes = ticket->t_curr_res; |
| if (ticket->t_cnt > 0) { |
| ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); |
| bytes += ticket->t_unit_res*ticket->t_cnt; |
| } |
| |
| xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes); |
| xlog_grant_sub_space(log, &log->l_write_head.grant, bytes); |
| |
| trace_xfs_log_ungrant_exit(log, ticket); |
| |
| xfs_log_space_wake(log->l_mp); |
| } |
| |
| /* |
| * Flush iclog to disk if this is the last reference to the given iclog and |
| * the WANT_SYNC bit is set. |
| * |
| * When this function is entered, the iclog is not necessarily in the |
| * WANT_SYNC state. It may be sitting around waiting to get filled. |
| * |
| * |
| */ |
| STATIC int |
| xlog_state_release_iclog( |
| struct xlog *log, |
| struct xlog_in_core *iclog) |
| { |
| int sync = 0; /* do we sync? */ |
| |
| if (iclog->ic_state & XLOG_STATE_IOERROR) |
| return -EIO; |
| |
| ASSERT(atomic_read(&iclog->ic_refcnt) > 0); |
| if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) |
| return 0; |
| |
| if (iclog->ic_state & XLOG_STATE_IOERROR) { |
| spin_unlock(&log->l_icloglock); |
| return -EIO; |
| } |
| ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || |
| iclog->ic_state == XLOG_STATE_WANT_SYNC); |
| |
| if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { |
| /* update tail before writing to iclog */ |
| xfs_lsn_t tail_lsn = xlog_assign_tail_lsn(log->l_mp); |
| sync++; |
| iclog->ic_state = XLOG_STATE_SYNCING; |
| iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn); |
| xlog_verify_tail_lsn(log, iclog, tail_lsn); |
| /* cycle incremented when incrementing curr_block */ |
| } |
| spin_unlock(&log->l_icloglock); |
| |
| /* |
| * We let the log lock go, so it's possible that we hit a log I/O |
| * error or some other SHUTDOWN condition that marks the iclog |
| * as XLOG_STATE_IOERROR before the bwrite. However, we know that |
| * this iclog has consistent data, so we ignore IOERROR |
| * flags after this point. |
| */ |
| if (sync) |
| return xlog_sync(log, iclog); |
| return 0; |
| } /* xlog_state_release_iclog */ |
| |
| |
| /* |
| * This routine will mark the current iclog in the ring as WANT_SYNC |
| * and move the current iclog pointer to the next iclog in the ring. |
| * When this routine is called from xlog_state_get_iclog_space(), the |
| * exact size of the iclog has not yet been determined. All we know is |
| * that every data block. We have run out of space in this log record. |
| */ |
| STATIC void |
| xlog_state_switch_iclogs( |
| struct xlog *log, |
| struct xlog_in_core *iclog, |
| int eventual_size) |
| { |
| ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); |
| if (!eventual_size) |
| eventual_size = iclog->ic_offset; |
| iclog->ic_state = XLOG_STATE_WANT_SYNC; |
| iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); |
| log->l_prev_block = log->l_curr_block; |
| log->l_prev_cycle = log->l_curr_cycle; |
| |
| /* roll log?: ic_offset changed later */ |
| log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); |
| |
| /* Round up to next log-sunit */ |
| if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
| log->l_mp->m_sb.sb_logsunit > 1) { |
| __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); |
| log->l_curr_block = roundup(log->l_curr_block, sunit_bb); |
| } |
| |
| if (log->l_curr_block >= log->l_logBBsize) { |
| log->l_curr_cycle++; |
| if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) |
| log->l_curr_cycle++; |
| log->l_curr_block -= log->l_logBBsize; |
| ASSERT(log->l_curr_block >= 0); |
| } |
| ASSERT(iclog == log->l_iclog); |
| log->l_iclog = iclog->ic_next; |
| } /* xlog_state_switch_iclogs */ |
| |
| /* |
| * Write out all data in the in-core log as of this exact moment in time. |
| * |
| * Data may be written to the in-core log during this call. However, |
| * we don't guarantee this data will be written out. A change from past |
| * implementation means this routine will *not* write out zero length LRs. |
| * |
| * Basically, we try and perform an intelligent scan of the in-core logs. |
| * If we determine there is no flushable data, we just return. There is no |
| * flushable data if: |
| * |
| * 1. the current iclog is active and has no data; the previous iclog |
| * is in the active or dirty state. |
| * 2. the current iclog is drity, and the previous iclog is in the |
| * active or dirty state. |
| * |
| * We may sleep if: |
| * |
| * 1. the current iclog is not in the active nor dirty state. |
| * 2. the current iclog dirty, and the previous iclog is not in the |
| * active nor dirty state. |
| * 3. the current iclog is active, and there is another thread writing |
| * to this particular iclog. |
| * 4. a) the current iclog is active and has no other writers |
| * b) when we return from flushing out this iclog, it is still |
| * not in the active nor dirty state. |
| */ |
| int |
| _xfs_log_force( |
| struct xfs_mount *mp, |
| uint flags, |
| int *log_flushed) |
| { |
| struct xlog *log = mp->m_log; |
| struct xlog_in_core *iclog; |
| xfs_lsn_t lsn; |
| |
| XFS_STATS_INC(xs_log_force); |
| |
| xlog_cil_force(log); |
| |
| spin_lock(&log->l_icloglock); |
| |
| iclog = log->l_iclog; |
| if (iclog->ic_state & XLOG_STATE_IOERROR) { |
| spin_unlock(&log->l_icloglock); |
| return -EIO; |
| } |
| |
| /* If the head iclog is not active nor dirty, we just attach |
| * ourselves to the head and go to sleep. |
| */ |
| if (iclog->ic_state == XLOG_STATE_ACTIVE || |
| iclog->ic_state == XLOG_STATE_DIRTY) { |
| /* |
| * If the head is dirty or (active and empty), then |
| * we need to look at the previous iclog. If the previous |
| * iclog is active or dirty we are done. There is nothing |
| * to sync out. Otherwise, we attach ourselves to the |
| * previous iclog and go to sleep. |
| */ |
| if (iclog->ic_state == XLOG_STATE_DIRTY || |
| (atomic_read(&iclog->ic_refcnt) == 0 |
| && iclog->ic_offset == 0)) { |
| iclog = iclog->ic_prev; |
| if (iclog->ic_state == XLOG_STATE_ACTIVE || |
| iclog->ic_state == XLOG_STATE_DIRTY) |
| goto no_sleep; |
| else |
| goto maybe_sleep; |
| } else { |
| if (atomic_read(&iclog->ic_refcnt) == 0) { |
| /* We are the only one with access to this |
| * iclog. Flush it out now. There should |
| * be a roundoff of zero to show that someone |
| * has already taken care of the roundoff from |
| * the previous sync. |
| */ |
| atomic_inc(&iclog->ic_refcnt); |
| lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
| xlog_state_switch_iclogs(log, iclog, 0); |
| spin_unlock(&log->l_icloglock); |
| |
| if (xlog_state_release_iclog(log, iclog)) |
| return -EIO; |
| |
| if (log_flushed) |
| *log_flushed = 1; |
| spin_lock(&log->l_icloglock); |
| if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn && |
| iclog->ic_state != XLOG_STATE_DIRTY) |
| goto maybe_sleep; |
| else |
| goto no_sleep; |
| } else { |
| /* Someone else is writing to this iclog. |
| * Use its call to flush out the data. However, |
| * the other thread may not force out this LR, |
| * so we mark it WANT_SYNC. |
| */ |
| xlog_state_switch_iclogs(log, iclog, 0); |
| goto maybe_sleep; |
| } |
| } |
| } |
| |
| /* By the time we come around again, the iclog could've been filled |
| * which would give it another lsn. If we have a new lsn, just |
| * return because the relevant data has been flushed. |
| */ |
| maybe_sleep: |
| if (flags & XFS_LOG_SYNC) { |
| /* |
| * We must check if we're shutting down here, before |
| * we wait, while we're holding the l_icloglock. |
| * Then we check again after waking up, in case our |
| * sleep was disturbed by a bad news. |
| */ |
| if (iclog->ic_state & XLOG_STATE_IOERROR) { |
| spin_unlock(&log->l_icloglock); |
| return -EIO; |
| } |
| XFS_STATS_INC(xs_log_force_sleep); |
| xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); |
| /* |
| * No need to grab the log lock here since we're |
| * only deciding whether or not to return EIO |
| * and the memory read should be atomic. |
| */ |
| if (iclog->ic_state & XLOG_STATE_IOERROR) |
| return -EIO; |
| if (log_flushed) |
| *log_flushed = 1; |
| } else { |
| |
| no_sleep: |
| spin_unlock(&log->l_icloglock); |
| } |
| return 0; |
| } |
| |
| /* |
| * Wrapper for _xfs_log_force(), to be used when caller doesn't care |
| * about errors or whether the log was flushed or not. This is the normal |
| * interface to use when trying to unpin items or move the log forward. |
| */ |
| void |
| xfs_log_force( |
| xfs_mount_t *mp, |
| uint flags) |
| { |
| int error; |
| |
| trace_xfs_log_force(mp, 0); |
| error = _xfs_log_force(mp, flags, NULL); |
| if (error) |
| xfs_warn(mp, "%s: error %d returned.", __func__, error); |
| } |
| |
| /* |
| * Force the in-core log to disk for a specific LSN. |
| * |
| * Find in-core log with lsn. |
| * If it is in the DIRTY state, just return. |
| * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC |
| * state and go to sleep or return. |
| * If it is in any other state, go to sleep or return. |
| * |
| * Synchronous forces are implemented with a signal variable. All callers |
| * to force a given lsn to disk will wait on a the sv attached to the |
| * specific in-core log. When given in-core log finally completes its |
| * write to disk, that thread will wake up all threads waiting on the |
| * sv. |
| */ |
| int |
| _xfs_log_force_lsn( |
| struct xfs_mount *mp, |
| xfs_lsn_t lsn, |
| uint flags, |
| int *log_flushed) |
| { |
| struct xlog *log = mp->m_log; |
| struct xlog_in_core *iclog; |
| int already_slept = 0; |
| |
| ASSERT(lsn != 0); |
| |
| XFS_STATS_INC(xs_log_force); |
| |
| lsn = xlog_cil_force_lsn(log, lsn); |
| if (lsn == NULLCOMMITLSN) |
| return 0; |
| |
| try_again: |
| spin_lock(&log->l_icloglock); |
| iclog = log->l_iclog; |
| if (iclog->ic_state & XLOG_STATE_IOERROR) { |
| spin_unlock(&log->l_icloglock); |
| return -EIO; |
| } |
| |
| do { |
| if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { |
| iclog = iclog->ic_next; |
| continue; |
| } |
| |
| if (iclog->ic_state == XLOG_STATE_DIRTY) { |
| spin_unlock(&log->l_icloglock); |
| return 0; |
| } |
| |
| if (iclog->ic_state == XLOG_STATE_ACTIVE) { |
| /* |
| * We sleep here if we haven't already slept (e.g. |
| * this is the first time we've looked at the correct |
| * iclog buf) and the buffer before us is going to |
| * be sync'ed. The reason for this is that if we |
| * are doing sync transactions here, by waiting for |
| * the previous I/O to complete, we can allow a few |
| * more transactions into this iclog before we close |
| * it down. |
| * |
| * Otherwise, we mark the buffer WANT_SYNC, and bump |
| * up the refcnt so we can release the log (which |
| * drops the ref count). The state switch keeps new |
| * transaction commits from using this buffer. When |
| * the current commits finish writing into the buffer, |
| * the refcount will drop to zero and the buffer will |
| * go out then. |
| */ |
| if (!already_slept && |
| (iclog->ic_prev->ic_state & |
| (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) { |
| ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); |
| |
| XFS_STATS_INC(xs_log_force_sleep); |
| |
| xlog_wait(&iclog->ic_prev->ic_write_wait, |
| &log->l_icloglock); |
| if (log_flushed) |
| *log_flushed = 1; |
| already_slept = 1; |
| goto try_again; |
| } |
| atomic_inc(&iclog->ic_refcnt); |
| xlog_state_switch_iclogs(log, iclog, 0); |
| spin_unlock(&log->l_icloglock); |
| if (xlog_state_release_iclog(log, iclog)) |
| return -EIO; |
| if (log_flushed) |
| *log_flushed = 1; |
| spin_lock(&log->l_icloglock); |
| } |
| |
| if ((flags & XFS_LOG_SYNC) && /* sleep */ |
| !(iclog->ic_state & |
| (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { |
| /* |
| * Don't wait on completion if we know that we've |
| * gotten a log write error. |
| */ |
| if (iclog->ic_state & XLOG_STATE_IOERROR) { |
| spin_unlock(&log->l_icloglock); |
| return -EIO; |
| } |
| XFS_STATS_INC(xs_log_force_sleep); |
| xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); |
| /* |
| * No need to grab the log lock here since we're |
| * only deciding whether or not to return EIO |
| * and the memory read should be atomic. |
| */ |
| if (iclog->ic_state & XLOG_STATE_IOERROR) |
| return -EIO; |
| |
| if (log_flushed) |
| *log_flushed = 1; |
| } else { /* just return */ |
| spin_unlock(&log->l_icloglock); |
| } |
| |
| return 0; |
| } while (iclog != log->l_iclog); |
| |
| spin_unlock(&log->l_icloglock); |
| return 0; |
| } |
| |
| /* |
| * Wrapper for _xfs_log_force_lsn(), to be used when caller doesn't care |
| * about errors or whether the log was flushed or not. This is the normal |
| * interface to use when trying to unpin items or move the log forward. |
| */ |
| void |
| xfs_log_force_lsn( |
| xfs_mount_t *mp, |
| xfs_lsn_t lsn, |
| uint flags) |
| { |
| int error; |
| |
| trace_xfs_log_force(mp, lsn); |
| error = _xfs_log_force_lsn(mp, lsn, flags, NULL); |
| if (error) |
| xfs_warn(mp, "%s: error %d returned.", __func__, error); |
| } |
| |
| /* |
| * Called when we want to mark the current iclog as being ready to sync to |
| * disk. |
| */ |
| STATIC void |
| xlog_state_want_sync( |
| struct xlog *log, |
| struct xlog_in_core *iclog) |
| { |
| assert_spin_locked(&log->l_icloglock); |
| |
| if (iclog->ic_state == XLOG_STATE_ACTIVE) { |
| xlog_state_switch_iclogs(log, iclog, 0); |
| } else { |
| ASSERT(iclog->ic_state & |
| (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); |
| } |
| } |
| |
| |
| /***************************************************************************** |
| * |
| * TICKET functions |
| * |
| ***************************************************************************** |
| */ |
| |
| /* |
| * Free a used ticket when its refcount falls to zero. |
| */ |
| void |
| xfs_log_ticket_put( |
| xlog_ticket_t *ticket) |
| { |
| ASSERT(atomic_read(&ticket->t_ref) > 0); |
| if (atomic_dec_and_test(&ticket->t_ref)) |
| kmem_zone_free(xfs_log_ticket_zone, ticket); |
| } |
| |
| xlog_ticket_t * |
| xfs_log_ticket_get( |
| xlog_ticket_t *ticket) |
| { |
| ASSERT(atomic_read(&ticket->t_ref) > 0); |
| atomic_inc(&ticket->t_ref); |
| return ticket; |
| } |
| |
| /* |
| * Figure out the total log space unit (in bytes) that would be |
| * required for a log ticket. |
| */ |
| int |
| xfs_log_calc_unit_res( |
| struct xfs_mount *mp, |
| int unit_bytes) |
| { |
| struct xlog *log = mp->m_log; |
| int iclog_space; |
| uint num_headers; |
| |
| /* |
| * Permanent reservations have up to 'cnt'-1 active log operations |
| * in the log. A unit in this case is the amount of space for one |
| * of these log operations. Normal reservations have a cnt of 1 |
| * and their unit amount is the total amount of space required. |
| * |
| * The following lines of code account for non-transaction data |
| * which occupy space in the on-disk log. |
| * |
| * Normal form of a transaction is: |
| * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> |
| * and then there are LR hdrs, split-recs and roundoff at end of syncs. |
| * |
| * We need to account for all the leadup data and trailer data |
| * around the transaction data. |
| * And then we need to account for the worst case in terms of using |
| * more space. |
| * The worst case will happen if: |
| * - the placement of the transaction happens to be such that the |
| * roundoff is at its maximum |
| * - the transaction data is synced before the commit record is synced |
| * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> |
| * Therefore the commit record is in its own Log Record. |
| * This can happen as the commit record is called with its |
| * own region to xlog_write(). |
| * This then means that in the worst case, roundoff can happen for |
| * the commit-rec as well. |
| * The commit-rec is smaller than padding in this scenario and so it is |
| * not added separately. |
| */ |
| |
| /* for trans header */ |
| unit_bytes += sizeof(xlog_op_header_t); |
| unit_bytes += sizeof(xfs_trans_header_t); |
| |
| /* for start-rec */ |
| unit_bytes += sizeof(xlog_op_header_t); |
| |
| /* |
| * for LR headers - the space for data in an iclog is the size minus |
| * the space used for the headers. If we use the iclog size, then we |
| * undercalculate the number of headers required. |
| * |
| * Furthermore - the addition of op headers for split-recs might |
| * increase the space required enough to require more log and op |
| * headers, so take that into account too. |
| * |
| * IMPORTANT: This reservation makes the assumption that if this |
| * transaction is the first in an iclog and hence has the LR headers |
| * accounted to it, then the remaining space in the iclog is |
| * exclusively for this transaction. i.e. if the transaction is larger |
| * than the iclog, it will be the only thing in that iclog. |
| * Fundamentally, this means we must pass the entire log vector to |
| * xlog_write to guarantee this. |
| */ |
| iclog_space = log->l_iclog_size - log->l_iclog_hsize; |
| num_headers = howmany(unit_bytes, iclog_space); |
| |
| /* for split-recs - ophdrs added when data split over LRs */ |
| unit_bytes += sizeof(xlog_op_header_t) * num_headers; |
| |
| /* add extra header reservations if we overrun */ |
| while (!num_headers || |
| howmany(unit_bytes, iclog_space) > num_headers) { |
| unit_bytes += sizeof(xlog_op_header_t); |
| num_headers++; |
| } |
| unit_bytes += log->l_iclog_hsize * num_headers; |
| |
| /* for commit-rec LR header - note: padding will subsume the ophdr */ |
| unit_bytes += log->l_iclog_hsize; |
| |
| /* for roundoff padding for transaction data and one for commit record */ |
| if (xfs_sb_version_haslogv2(&mp->m_sb) && mp->m_sb.sb_logsunit > 1) { |
| /* log su roundoff */ |
| unit_bytes += 2 * mp->m_sb.sb_logsunit; |
| } else { |
| /* BB roundoff */ |
| unit_bytes += 2 * BBSIZE; |
| } |
| |
| return unit_bytes; |
| } |
| |
| /* |
| * Allocate and initialise a new log ticket. |
| */ |
| struct xlog_ticket * |
| xlog_ticket_alloc( |
| struct xlog *log, |
| int unit_bytes, |
| int cnt, |
| char client, |
| bool permanent, |
| xfs_km_flags_t alloc_flags) |
| { |
| struct xlog_ticket *tic; |
| int unit_res; |
| |
| tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags); |
| if (!tic) |
| return NULL; |
| |
| unit_res = xfs_log_calc_unit_res(log->l_mp, unit_bytes); |
| |
| atomic_set(&tic->t_ref, 1); |
| tic->t_task = current; |
| INIT_LIST_HEAD(&tic->t_queue); |
| tic->t_unit_res = unit_res; |
| tic->t_curr_res = unit_res; |
| tic->t_cnt = cnt; |
| tic->t_ocnt = cnt; |
| tic->t_tid = prandom_u32(); |
| tic->t_clientid = client; |
| tic->t_flags = XLOG_TIC_INITED; |
| tic->t_trans_type = 0; |
| if (permanent) |
| tic->t_flags |= XLOG_TIC_PERM_RESERV; |
| |
| xlog_tic_reset_res(tic); |
| |
| return tic; |
| } |
| |
| |
| /****************************************************************************** |
| * |
| * Log debug routines |
| * |
| ****************************************************************************** |
| */ |
| #if defined(DEBUG) |
| /* |
| * Make sure that the destination ptr is within the valid data region of |
| * one of the iclogs. This uses backup pointers stored in a different |
| * part of the log in case we trash the log structure. |
| */ |
| void |
| xlog_verify_dest_ptr( |
| struct xlog *log, |
| char *ptr) |
| { |
| int i; |
| int good_ptr = 0; |
| |
| for (i = 0; i < log->l_iclog_bufs; i++) { |
| if (ptr >= log->l_iclog_bak[i] && |
| ptr <= log->l_iclog_bak[i] + log->l_iclog_size) |
| good_ptr++; |
| } |
| |
| if (!good_ptr) |
| xfs_emerg(log->l_mp, "%s: invalid ptr", __func__); |
| } |
| |
| /* |
| * Check to make sure the grant write head didn't just over lap the tail. If |
| * the cycles are the same, we can't be overlapping. Otherwise, make sure that |
| * the cycles differ by exactly one and check the byte count. |
| * |
| * This check is run unlocked, so can give false positives. Rather than assert |
| * on failures, use a warn-once flag and a panic tag to allow the admin to |
| * determine if they want to panic the machine when such an error occurs. For |
| * debug kernels this will have the same effect as using an assert but, unlinke |
| * an assert, it can be turned off at runtime. |
| */ |
| STATIC void |
| xlog_verify_grant_tail( |
| struct xlog *log) |
| { |
| int tail_cycle, tail_blocks; |
| int cycle, space; |
| |
| xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space); |
| xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks); |
| if (tail_cycle != cycle) { |
| if (cycle - 1 != tail_cycle && |
| !(log->l_flags & XLOG_TAIL_WARN)) { |
| xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, |
| "%s: cycle - 1 != tail_cycle", __func__); |
| log->l_flags |= XLOG_TAIL_WARN; |
| } |
| |
| if (space > BBTOB(tail_blocks) && |
| !(log->l_flags & XLOG_TAIL_WARN)) { |
| xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, |
| "%s: space > BBTOB(tail_blocks)", __func__); |
| log->l_flags |= XLOG_TAIL_WARN; |
| } |
| } |
| } |
| |
| /* check if it will fit */ |
| STATIC void |
| xlog_verify_tail_lsn( |
| struct xlog *log, |
| struct xlog_in_core *iclog, |
| xfs_lsn_t tail_lsn) |
| { |
| int blocks; |
| |
| if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { |
| blocks = |
| log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); |
| if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) |
| xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
| } else { |
| ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); |
| |
| if (BLOCK_LSN(tail_lsn) == log->l_prev_block) |
| xfs_emerg(log->l_mp, "%s: tail wrapped", __func__); |
| |
| blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; |
| if (blocks < BTOBB(iclog->ic_offset) + 1) |
| xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
| } |
| } /* xlog_verify_tail_lsn */ |
| |
| /* |
| * Perform a number of checks on the iclog before writing to disk. |
| * |
| * 1. Make sure the iclogs are still circular |
| * 2. Make sure we have a good magic number |
| * 3. Make sure we don't have magic numbers in the data |
| * 4. Check fields of each log operation header for: |
| * A. Valid client identifier |
| * B. tid ptr value falls in valid ptr space (user space code) |
| * C. Length in log record header is correct according to the |
| * individual operation headers within record. |
| * 5. When a bwrite will occur within 5 blocks of the front of the physical |
| * log, check the preceding blocks of the physical log to make sure all |
| * the cycle numbers agree with the current cycle number. |
| */ |
| STATIC void |
| xlog_verify_iclog( |
| struct xlog *log, |
| struct xlog_in_core *iclog, |
| int count, |
| bool syncing) |
| { |
| xlog_op_header_t *ophead; |
| xlog_in_core_t *icptr; |
| xlog_in_core_2_t *xhdr; |
| xfs_caddr_t ptr; |
| xfs_caddr_t base_ptr; |
| __psint_t field_offset; |
| __uint8_t clientid; |
| int len, i, j, k, op_len; |
| int idx; |
| |
| /* check validity of iclog pointers */ |
| spin_lock(&log->l_icloglock); |
| icptr = log->l_iclog; |
| for (i = 0; i < log->l_iclog_bufs; i++, icptr = icptr->ic_next) |
| ASSERT(icptr); |
| |
| if (icptr != log->l_iclog) |
| xfs_emerg(log->l_mp, "%s: corrupt iclog ring", __func__); |
| spin_unlock(&log->l_icloglock); |
| |
| /* check log magic numbers */ |
| if (iclog->ic_header.h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
| xfs_emerg(log->l_mp, "%s: invalid magic num", __func__); |
| |
| ptr = (xfs_caddr_t) &iclog->ic_header; |
| for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count; |
| ptr += BBSIZE) { |
| if (*(__be32 *)ptr == cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
| xfs_emerg(log->l_mp, "%s: unexpected magic num", |
| __func__); |
| } |
| |
| /* check fields */ |
| len = be32_to_cpu(iclog->ic_header.h_num_logops); |
| ptr = iclog->ic_datap; |
| base_ptr = ptr; |
| ophead = (xlog_op_header_t *)ptr; |
| xhdr = iclog->ic_data; |
| for (i = 0; i < len; i++) { |
| ophead = (xlog_op_header_t *)ptr; |
| |
| /* clientid is only 1 byte */ |
| field_offset = (__psint_t) |
| ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); |
| if (!syncing || (field_offset & 0x1ff)) { |
| clientid = ophead->oh_clientid; |
| } else { |
| idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); |
| if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { |
| j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); |
| k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); |
| clientid = xlog_get_client_id( |
| xhdr[j].hic_xheader.xh_cycle_data[k]); |
| } else { |
| clientid = xlog_get_client_id( |
| iclog->ic_header.h_cycle_data[idx]); |
| } |
| } |
| if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) |
| xfs_warn(log->l_mp, |
| "%s: invalid clientid %d op 0x%p offset 0x%lx", |
| __func__, clientid, ophead, |
| (unsigned long)field_offset); |
| |
| /* check length */ |
| field_offset = (__psint_t) |
| ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); |
| if (!syncing || (field_offset & 0x1ff)) { |
| op_len = be32_to_cpu(ophead->oh_len); |
| } else { |
| idx = BTOBBT((__psint_t)&ophead->oh_len - |
| (__psint_t)iclog->ic_datap); |
| if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { |
| j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); |
| k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); |
| op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); |
| } else { |
| op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); |
| } |
| } |
| ptr += sizeof(xlog_op_header_t) + op_len; |
| } |
| } /* xlog_verify_iclog */ |
| #endif |
| |
| /* |
| * Mark all iclogs IOERROR. l_icloglock is held by the caller. |
| */ |
| STATIC int |
| xlog_state_ioerror( |
| struct xlog *log) |
| { |
| xlog_in_core_t *iclog, *ic; |
| |
| iclog = log->l_iclog; |
| if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { |
| /* |
| * Mark all the incore logs IOERROR. |
| * From now on, no log flushes will result. |
| */ |
| ic = iclog; |
| do { |
| ic->ic_state = XLOG_STATE_IOERROR; |
| ic = ic->ic_next; |
| } while (ic != iclog); |
| return 0; |
| } |
| /* |
| * Return non-zero, if state transition has already happened. |
| */ |
| return 1; |
| } |
| |
| /* |
| * This is called from xfs_force_shutdown, when we're forcibly |
| * shutting down the filesystem, typically because of an IO error. |
| * Our main objectives here are to make sure that: |
| * a. if !logerror, flush the logs to disk. Anything modified |
| * after this is ignored. |
| * b. the filesystem gets marked 'SHUTDOWN' for all interested |
| * parties to find out, 'atomically'. |
| * c. those who're sleeping on log reservations, pinned objects and |
| * other resources get woken up, and be told the bad news. |
| * d. nothing new gets queued up after (b) and (c) are done. |
| * |
| * Note: for the !logerror case we need to flush the regions held in memory out |
| * to disk first. This needs to be done before the log is marked as shutdown, |
| * otherwise the iclog writes will fail. |
| */ |
| int |
| xfs_log_force_umount( |
| struct xfs_mount *mp, |
| int logerror) |
| { |
| struct xlog *log; |
| int retval; |
| |
| log = mp->m_log; |
| |
| /* |
| * If this happens during log recovery, don't worry about |
| * locking; the log isn't open for business yet. |
| */ |
| if (!log || |
| log->l_flags & XLOG_ACTIVE_RECOVERY) { |
| mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
| if (mp->m_sb_bp) |
| XFS_BUF_DONE(mp->m_sb_bp); |
| return 0; |
| } |
| |
| /* |
| * Somebody could've already done the hard work for us. |
| * No need to get locks for this. |
| */ |
| if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { |
| ASSERT(XLOG_FORCED_SHUTDOWN(log)); |
| return 1; |
| } |
| |
| /* |
| * Flush all the completed transactions to disk before marking the log |
| * being shut down. We need to do it in this order to ensure that |
| * completed operations are safely on disk before we shut down, and that |
| * we don't have to issue any buffer IO after the shutdown flags are set |
| * to guarantee this. |
| */ |
| if (!logerror) |
| _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
| |
| /* |
| * mark the filesystem and the as in a shutdown state and wake |
| * everybody up to tell them the bad news. |
| */ |
| spin_lock(&log->l_icloglock); |
| mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
| if (mp->m_sb_bp) |
| XFS_BUF_DONE(mp->m_sb_bp); |
| |
| /* |
| * Mark the log and the iclogs with IO error flags to prevent any |
| * further log IO from being issued or completed. |
| */ |
| log->l_flags |= XLOG_IO_ERROR; |
| retval = xlog_state_ioerror(log); |
| spin_unlock(&log->l_icloglock); |
| |
| /* |
| * We don't want anybody waiting for log reservations after this. That |
| * means we have to wake up everybody queued up on reserveq as well as |
| * writeq. In addition, we make sure in xlog_{re}grant_log_space that |
| * we don't enqueue anything once the SHUTDOWN flag is set, and this |
| * action is protected by the grant locks. |
| */ |
| xlog_grant_head_wake_all(&log->l_reserve_head); |
| xlog_grant_head_wake_all(&log->l_write_head); |
| |
| /* |
| * Wake up everybody waiting on xfs_log_force. Wake the CIL push first |
| * as if the log writes were completed. The abort handling in the log |
| * item committed callback functions will do this again under lock to |
| * avoid races. |
| */ |
| wake_up_all(&log->l_cilp->xc_commit_wait); |
| xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); |
| |
| #ifdef XFSERRORDEBUG |
| { |
| xlog_in_core_t *iclog; |
| |
| spin_lock(&log->l_icloglock); |
| iclog = log->l_iclog; |
| do { |
| ASSERT(iclog->ic_callback == 0); |
| iclog = iclog->ic_next; |
| } while (iclog != log->l_iclog); |
| spin_unlock(&log->l_icloglock); |
| } |
| #endif |
| /* return non-zero if log IOERROR transition had already happened */ |
| return retval; |
| } |
| |
| STATIC int |
| xlog_iclogs_empty( |
| struct xlog *log) |
| { |
| xlog_in_core_t *iclog; |
| |
| iclog = log->l_iclog; |
| do { |
| /* endianness does not matter here, zero is zero in |
| * any language. |
| */ |
| if (iclog->ic_header.h_num_logops) |
| return 0; |
| iclog = iclog->ic_next; |
| } while (iclog != log->l_iclog); |
| return 1; |
| } |
| |