diff options
Diffstat (limited to 'fs/xfs/xfs_log.c')
| -rw-r--r-- | fs/xfs/xfs_log.c | 4116 |
1 files changed, 4116 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c new file mode 100644 index 000000000..8b1b0862e --- /dev/null +++ b/fs/xfs/xfs_log.c @@ -0,0 +1,4116 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2005 Silicon Graphics, Inc. + * All Rights Reserved. + */ +#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_mount.h" +#include "xfs_errortag.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" +#include "xfs_sb.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, + void *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(log->l_mp, 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(mp, 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 to 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) +{ + 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(mp, xs_try_logspace); + + ASSERT(*ticp == NULL); + tic = xlog_ticket_alloc(log, unit_bytes, cnt, client, permanent, + KM_SLEEP | KM_MAYFAIL); + if (!tic) + return -ENOMEM; + + *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, + bool regrant) +{ + 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; + regrant = false; + } + + + if (!regrant) { + 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); + } 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; + } + + xfs_log_ticket_put(ticket); + 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 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) +{ + bool fatal = xfs_sb_version_hascrc(&mp->m_sb); + 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; + } else if (mp->m_sb.sb_logsunit > 1 && + mp->m_sb.sb_logsunit % mp->m_sb.sb_blocksize) { + xfs_warn(mp, + "log stripe unit %u bytes must be a multiple of block size", + mp->m_sb.sb_logsunit); + error = -EINVAL; + fatal = true; + } + if (error) { + /* + * Log check errors are always fatal on v5; or whenever bad + * metadata leads to a crash. + */ + if (fatal) { + xfs_crit(mp, "AAIEEE! Log failed size checks. Abort!"); + ASSERT(0); + goto out_free_log; + } + xfs_crit(mp, "Log size out of supported range."); + xfs_crit(mp, +"Continuing onwards, but if log hangs are 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); + xlog_recover_cancel(mp->m_log); + 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( + struct xfs_mount *mp) +{ + int error = 0; + bool readonly = (mp->m_flags & XFS_MOUNT_RDONLY); + bool recovered = mp->m_log->l_flags & XLOG_RECOVERY_NEEDED; + + if (mp->m_flags & XFS_MOUNT_NORECOVERY) { + ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); + return 0; + } else if (readonly) { + /* Allow unlinked processing to proceed */ + mp->m_flags &= ~XFS_MOUNT_RDONLY; + } + + /* + * During the second phase of log recovery, we need iget and + * iput to behave like they do for an active filesystem. + * xfs_fs_drop_inode needs to be able to prevent the deletion + * of inodes before we're done replaying log items on those + * inodes. Turn it off immediately after recovery finishes + * so that we don't leak the quota inodes if subsequent mount + * activities fail. + * + * We let all inodes involved in redo item processing end up on + * the LRU instead of being evicted immediately so that if we do + * something to an unlinked inode, the irele won't cause + * premature truncation and freeing of the inode, which results + * in log recovery failure. We have to evict the unreferenced + * lru inodes after clearing SB_ACTIVE because we don't + * otherwise clean up the lru if there's a subsequent failure in + * xfs_mountfs, which leads to us leaking the inodes if nothing + * else (e.g. quotacheck) references the inodes before the + * mount failure occurs. + */ + mp->m_super->s_flags |= SB_ACTIVE; + error = xlog_recover_finish(mp->m_log); + if (!error) + xfs_log_work_queue(mp); + mp->m_super->s_flags &= ~SB_ACTIVE; + evict_inodes(mp->m_super); + + /* + * Drain the buffer LRU after log recovery. This is required for v4 + * filesystems to avoid leaving around buffers with NULL verifier ops, + * but we do it unconditionally to make sure we're always in a clean + * cache state after mount. + * + * Don't push in the error case because the AIL may have pending intents + * that aren't removed until recovery is cancelled. + */ + if (!error && recovered) { + xfs_log_force(mp, XFS_LOG_SYNC); + xfs_ail_push_all_sync(mp->m_ail); + } + xfs_wait_buftarg(mp->m_ddev_targp); + + if (readonly) + mp->m_flags |= XFS_MOUNT_RDONLY; + + return error; +} + +/* + * The mount has failed. Cancel the recovery if it hasn't completed and destroy + * the log. + */ +int +xfs_log_mount_cancel( + struct xfs_mount *mp) +{ + int error; + + error = xlog_recover_cancel(mp->m_log); + xfs_log_unmount(mp); + + 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. + */ + +/* Actually write the unmount record to disk. */ +static void +xfs_log_write_unmount_record( + struct xfs_mount *mp) +{ + /* the data section must be 32 bit size aligned */ + struct xfs_unmount_log_format 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 = ®, + }; + struct xlog *log = mp->m_log; + struct xlog_in_core *iclog; + struct xlog_ticket *tic = NULL; + xfs_lsn_t lsn; + uint flags = XLOG_UNMOUNT_TRANS; + int error; + + error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0); + if (error) + goto out_err; + + /* + * If we think the summary counters are bad, clear the unmount header + * flag in the unmount record so that the summary counters will be + * recalculated during log recovery at next mount. Refer to + * xlog_check_unmount_rec for more details. + */ + if (XFS_TEST_ERROR((mp->m_flags & XFS_MOUNT_BAD_SUMMARY), mp, + XFS_ERRTAG_FORCE_SUMMARY_RECALC)) { + xfs_alert(mp, "%s: will fix summary counters at next mount", + __func__); + flags &= ~XLOG_UNMOUNT_TRANS; + } + + /* 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, flags); + /* + * At this point, we're umounting anyway, so there's no point in + * transitioning log state to IOERROR. Just continue... + */ +out_err: + 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); + switch (iclog->ic_state) { + default: + if (!XLOG_FORCED_SHUTDOWN(log)) { + xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); + break; + } + /* fall through */ + case XLOG_STATE_ACTIVE: + case XLOG_STATE_DIRTY: + spin_unlock(&log->l_icloglock); + break; + } + + if (tic) { + trace_xfs_log_umount_write(log, tic); + xlog_ungrant_log_space(log, tic); + xfs_log_ticket_put(tic); + } +} + +/* + * 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. + */ + +static 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 + int error; + + /* + * Don't write out unmount record on norecovery mounts or ro devices. + * Or, if we are doing a forced umount (typically because of IO errors). + */ + if (mp->m_flags & XFS_MOUNT_NORECOVERY || + xfs_readonly_buftarg(log->l_mp->m_logdev_targp)) { + ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); + return 0; + } + + error = xfs_log_force(mp, XFS_LOG_SYNC); + 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))) { + xfs_log_write_unmount_record(mp); + } 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); + INIT_LIST_HEAD(&item->li_bio_list); + INIT_LIST_HEAD(&item->li_trans); +} + +/* + * 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. + */ +static int +xfs_log_need_covered(xfs_mount_t *mp) +{ + struct xlog *log = mp->m_log; + int needed = 0; + + if (!xfs_fs_writable(mp, SB_FREEZE_WRITE)) + 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->ail_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->ail_lock); + tail_lsn = xlog_assign_tail_lsn_locked(mp); + spin_unlock(&mp->m_ail->ail_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"); + xfs_alert(log->l_mp, + " tail_cycle = %d, tail_bytes = %d", + tail_cycle, tail_bytes); + xfs_alert(log->l_mp, + " GH cycle = %d, GH bytes = %d", + 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. + */ +static void +xlog_iodone(xfs_buf_t *bp) +{ + struct xlog_in_core *iclog = bp->b_log_item; + struct xlog *l = iclog->ic_log; + int aborted = 0; + + /* + * Race to shutdown the filesystem if we see an error or the iclog is in + * IOABORT state. The IOABORT state is only set in DEBUG mode to inject + * CRC errors into log recovery. + */ + if (XFS_TEST_ERROR(bp->b_error, l->l_mp, XFS_ERRTAG_IODONE_IOERR) || + iclog->ic_state & XLOG_STATE_IOABORT) { + if (iclog->ic_state & XLOG_STATE_IOABORT) + iclog->ic_state &= ~XLOG_STATE_IOABORT; + + 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(bp->b_flags & XBF_ASYNC); + 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_sync_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. + */ +static 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)) { + /* + * Dump a transaction into the log that contains no real change. + * This is needed to stamp the current tail LSN into the log + * during the covering operation. + * + * We cannot use an inode here for this - that will push dirty + * state back up into the VFS and then periodic inode flushing + * will prevent log covering from making progress. Hence we + * synchronously log the superblock instead to ensure the + * superblock is immediately unpinned and can be written back. + */ + xfs_sync_sb(mp, true); + } 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), XBF_NO_IOACCT); + 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); + + /* use high priority wq for log I/O completion */ + bp->b_ioend_wq = mp->m_log_workqueue; + 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), + XBF_NO_IOACCT); + if (!bp) + goto out_free_iclog; + + ASSERT(xfs_buf_islocked(bp)); + xfs_buf_unlock(bp); + + /* use high priority wq for log I/O completion */ + bp->b_ioend_wq = mp->m_log_workqueue; + bp->b_iodone = xlog_iodone; + iclog->ic_bp = bp; + iclog->ic_data = bp->b_addr; +#ifdef DEBUG + log->l_iclog_bak[i] = &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); + if (prev_iclog == log->l_iclog) + break; + } + 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; + char *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_update((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; + int xheads; + + xheads = size / XLOG_HEADER_CYCLE_SIZE; + if (size % XLOG_HEADER_CYCLE_SIZE) + xheads++; + + for (i = 1; i < xheads; 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_log_item; + + 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_submit(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(log->l_mp, 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(log->l_mp, 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); + /* + * Intentionally corrupt the log record CRC based on the error injection + * frequency, if defined. This facilitates testing log recovery in the + * event of torn writes. Hence, set the IOABORT state to abort the log + * write on I/O completion and shutdown the fs. The subsequent mount + * detects the bad CRC and attempts to recover. + */ + if (XFS_TEST_ERROR(false, log->l_mp, XFS_ERRTAG_LOG_BAD_CRC)) { + iclog->ic_header.h_crc &= cpu_to_le32(0xAAAAAAAA); + iclog->ic_state |= XLOG_STATE_IOABORT; + xfs_warn(log->l_mp, + "Intentionally corrupted log record at LSN 0x%llx. Shutdown imminent.", + be64_to_cpu(iclog->ic_header.h_lsn)); + } + + bp->b_io_length = BTOBB(count); + bp->b_log_item = iclog; + bp->b_flags &= ~XBF_FLUSH; + bp->b_flags |= (XBF_ASYNC | XBF_SYNCIO | XBF_WRITE | 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. + */ + 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_log_item = iclog; + bp->b_flags &= ~XBF_FLUSH; + bp->b_flags |= (XBF_ASYNC | XBF_SYNCIO | XBF_WRITE | 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); + 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 */ +#define REG_TYPE_STR(type, str) [XLOG_REG_TYPE_##type] = str + static char *res_type_str[XLOG_REG_TYPE_MAX + 1] = { + REG_TYPE_STR(BFORMAT, "bformat"), + REG_TYPE_STR(BCHUNK, "bchunk"), + REG_TYPE_STR(EFI_FORMAT, "efi_format"), + REG_TYPE_STR(EFD_FORMAT, "efd_format"), + REG_TYPE_STR(IFORMAT, "iformat"), + REG_TYPE_STR(ICORE, "icore"), + REG_TYPE_STR(IEXT, "iext"), + REG_TYPE_STR(IBROOT, "ibroot"), + REG_TYPE_STR(ILOCAL, "ilocal"), + REG_TYPE_STR(IATTR_EXT, "iattr_ext"), + REG_TYPE_STR(IATTR_BROOT, "iattr_broot"), + REG_TYPE_STR(IATTR_LOCAL, "iattr_local"), + REG_TYPE_STR(QFORMAT, "qformat"), + REG_TYPE_STR(DQUOT, "dquot"), + REG_TYPE_STR(QUOTAOFF, "quotaoff"), + REG_TYPE_STR(LRHEADER, "LR header"), + REG_TYPE_STR(UNMOUNT, "unmount"), + REG_TYPE_STR(COMMIT, "commit"), + REG_TYPE_STR(TRANSHDR, "trans header"), + REG_TYPE_STR(ICREATE, "inode create") + }; +#undef REG_TYPE_STR + + xfs_warn(mp, "ticket reservation summary:"); + xfs_warn(mp, " unit res = %d bytes", + ticket->t_unit_res); + xfs_warn(mp, " current res = %d bytes", + ticket->t_curr_res); + xfs_warn(mp, " total reg = %u bytes (o/flow = %u bytes)", + ticket->t_res_arr_sum, ticket->t_res_o_flow); + xfs_warn(mp, " ophdrs = %u (ophdr space = %u bytes)", + ticket->t_res_num_ophdrs, ophdr_spc); + xfs_warn(mp, " ophdr + reg = %u bytes", + ticket->t_res_arr_sum + ticket->t_res_o_flow + ophdr_spc); + xfs_warn(mp, " num regions = %u", + 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]), + ticket->t_res_arr[i].r_len); + } +} + +/* + * Print a summary of the transaction. + */ +void +xlog_print_trans( + struct xfs_trans *tp) +{ + struct xfs_mount *mp = tp->t_mountp; + struct xfs_log_item *lip; + + /* dump core transaction and ticket info */ + xfs_warn(mp, "transaction summary:"); + xfs_warn(mp, " log res = %d", tp->t_log_res); + xfs_warn(mp, " log count = %d", tp->t_log_count); + xfs_warn(mp, " flags = 0x%x", tp->t_flags); + + xlog_print_tic_res(mp, tp->t_ticket); + + /* dump each log item */ + list_for_each_entry(lip, &tp->t_items, li_trans) { + struct xfs_log_vec *lv = lip->li_lv; + struct xfs_log_iovec *vec; + int i; + + xfs_warn(mp, "log item: "); + xfs_warn(mp, " type = 0x%x", lip->li_type); + xfs_warn(mp, " flags = 0x%lx", lip->li_flags); + if (!lv) + continue; + xfs_warn(mp, " niovecs = %d", lv->lv_niovecs); + xfs_warn(mp, " size = %d", lv->lv_size); + xfs_warn(mp, " bytes = %d", lv->lv_bytes); + xfs_warn(mp, " buf len = %d", lv->lv_buf_len); + + /* dump each iovec for the log item */ + vec = lv->lv_iovecp; + for (i = 0; i < lv->lv_niovecs; i++) { + int dumplen = min(vec->i_len, 32); + + xfs_warn(mp, " iovec[%d]", i); + xfs_warn(mp, " type = 0x%x", vec->i_type); + xfs_warn(mp, " len = %d", vec->i_len); + xfs_warn(mp, " first %d bytes of iovec[%d]:", dumplen, i); + xfs_hex_dump(vec->i_addr, dumplen); + + vec++; + } + } +} + +/* + * 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 "PTR_FMT, + 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) { + xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, + "ctx ticket reservation ran out. Need to up reservation"); + xlog_print_tic_res(log->l_mp, ticket); + xfs_force_shutdown(log->l_mp, SHUTDOWN_LOG_IO_ERROR); + } + + 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. + * + * Unmount records just log an opheader, so can have + * empty payloads with no data region to copy. Hence we + * only copy the payload if the vector says it has data + * to copy. + */ + ASSERT(copy_len >= 0); + if (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) { + 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 */ + + 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); + +#ifdef DEBUG + /* + * Make one last gasp attempt to see if iclogs are being left in limbo. + * If the above loop finds an iclog earlier than the current iclog and + * in one of the syncing states, the current iclog is put into + * DO_CALLBACK and the callbacks are deferred to the completion of the + * earlier iclog. Walk the iclogs in order and make sure that no iclog + * is in DO_CALLBACK unless an earlier iclog is in one of the syncing + * states. + * + * Note that SYNCING|IOABORT is a valid state so we cannot just check + * for ic_state == SYNCING. + */ + 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_up_all(&log->l_flush_wait); + + spin_unlock(&log->l_icloglock); +} + + +/* + * 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(log->l_mp, 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) { + /* + * Rewind the current block before the cycle is bumped to make + * sure that the combined LSN never transiently moves forward + * when the log wraps to the next cycle. This is to support the + * unlocked sample of these fields from xlog_valid_lsn(). Most + * other cases should acquire l_icloglock. + */ + log->l_curr_block -= log->l_logBBsize; + ASSERT(log->l_curr_block >= 0); + smp_wmb(); + log->l_curr_cycle++; + if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) + log->l_curr_cycle++; + } + 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) +{ + struct xlog *log = mp->m_log; + struct xlog_in_core *iclog; + xfs_lsn_t lsn; + + XFS_STATS_INC(mp, xs_log_force); + trace_xfs_log_force(mp, 0, _RET_IP_); + + xlog_cil_force(log); + + spin_lock(&log->l_icloglock); + iclog = log->l_iclog; + if (iclog->ic_state & XLOG_STATE_IOERROR) + goto out_error; + + if (iclog->ic_state == XLOG_STATE_DIRTY || + (iclog->ic_state == XLOG_STATE_ACTIVE && + atomic_read(&iclog->ic_refcnt) == 0 && iclog->ic_offset == 0)) { + /* + * 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. + */ + iclog = iclog->ic_prev; + if (iclog->ic_state == XLOG_STATE_ACTIVE || + iclog->ic_state == XLOG_STATE_DIRTY) + goto out_unlock; + } else if (iclog->ic_state == XLOG_STATE_ACTIVE) { + 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; + + spin_lock(&log->l_icloglock); + if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn || + iclog->ic_state == XLOG_STATE_DIRTY) + goto out_unlock; + } 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); + } + } else { + /* + * If the head iclog is not active nor dirty, we just attach + * ourselves to the head and go to sleep if necessary. + */ + ; + } + + if (!(flags & XFS_LOG_SYNC)) + goto out_unlock; + + if (iclog->ic_state & XLOG_STATE_IOERROR) + goto out_error; + XFS_STATS_INC(mp, xs_log_force_sleep); + xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); + if (iclog->ic_state & XLOG_STATE_IOERROR) + return -EIO; + return 0; + +out_unlock: + spin_unlock(&log->l_icloglock); + return 0; +out_error: + spin_unlock(&log->l_icloglock); + return -EIO; +} + +static int +__xfs_log_force_lsn( + struct xfs_mount *mp, + xfs_lsn_t lsn, + uint flags, + int *log_flushed, + bool already_slept) +{ + struct xlog *log = mp->m_log; + struct xlog_in_core *iclog; + + spin_lock(&log->l_icloglock); + iclog = log->l_iclog; + if (iclog->ic_state & XLOG_STATE_IOERROR) + goto out_error; + + while (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { + iclog = iclog->ic_next; + if (iclog == log->l_iclog) + goto out_unlock; + } + + if (iclog->ic_state == XLOG_STATE_DIRTY) + goto out_unlock; + + 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(mp, xs_log_force_sleep); + + xlog_wait(&iclog->ic_prev->ic_write_wait, + &log->l_icloglock); + return -EAGAIN; + } + 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) || + (iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) + goto out_unlock; + + if (iclog->ic_state & XLOG_STATE_IOERROR) + goto out_error; + + XFS_STATS_INC(mp, xs_log_force_sleep); + xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); + if (iclog->ic_state & XLOG_STATE_IOERROR) + return -EIO; + return 0; + +out_unlock: + spin_unlock(&log->l_icloglock); + return 0; +out_error: + spin_unlock(&log->l_icloglock); + return -EIO; +} + +/* + * 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 wait queue. All callers trying + * to force a given lsn to disk must wait on the queue 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 queue. + */ +int +xfs_log_force_lsn( + struct xfs_mount *mp, + xfs_lsn_t lsn, + uint flags, + int *log_flushed) +{ + int ret; + ASSERT(lsn != 0); + + XFS_STATS_INC(mp, xs_log_force); + trace_xfs_log_force(mp, lsn, _RET_IP_); + + lsn = xlog_cil_force_lsn(mp->m_log, lsn); + if (lsn == NULLCOMMITLSN) + return 0; + + ret = __xfs_log_force_lsn(mp, lsn, flags, log_flushed, false); + if (ret == -EAGAIN) + ret = __xfs_log_force_lsn(mp, lsn, flags, log_flushed, true); + return ret; +} + +/* + * 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; + 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. + */ +STATIC void +xlog_verify_dest_ptr( + struct xlog *log, + void *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; + void *base_ptr, *ptr, *p; + ptrdiff_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__); + + base_ptr = ptr = &iclog->ic_header; + p = &iclog->ic_header; + for (ptr += BBSIZE; ptr < base_ptr + 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); + base_ptr = ptr = iclog->ic_datap; + ophead = ptr; + xhdr = iclog->ic_data; + for (i = 0; i < len; i++) { + ophead = ptr; + + /* clientid is only 1 byte */ + p = &ophead->oh_clientid; + field_offset = p - base_ptr; + if (!syncing || (field_offset & 0x1ff)) { + clientid = ophead->oh_clientid; + } else { + idx = BTOBBT((char *)&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 "PTR_FMT" offset 0x%lx", + __func__, clientid, ophead, + (unsigned long)field_offset); + + /* check length */ + p = &ophead->oh_len; + field_offset = p - base_ptr; + if (!syncing || (field_offset & 0x1ff)) { + op_len = be32_to_cpu(ophead->oh_len); + } else { + idx = BTOBBT((uintptr_t)&ophead->oh_len - + (uintptr_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) + mp->m_sb_bp->b_flags |= XBF_DONE; + 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); + + /* + * 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) + mp->m_sb_bp->b_flags |= XBF_DONE; + + /* + * 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. + */ + spin_lock(&log->l_cilp->xc_push_lock); + wake_up_all(&log->l_cilp->xc_commit_wait); + spin_unlock(&log->l_cilp->xc_push_lock); + 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; +} + +/* + * Verify that an LSN stamped into a piece of metadata is valid. This is + * intended for use in read verifiers on v5 superblocks. + */ +bool +xfs_log_check_lsn( + struct xfs_mount *mp, + xfs_lsn_t lsn) +{ + struct xlog *log = mp->m_log; + bool valid; + + /* + * norecovery mode skips mount-time log processing and unconditionally + * resets the in-core LSN. We can't validate in this mode, but + * modifications are not allowed anyways so just return true. + */ + if (mp->m_flags & XFS_MOUNT_NORECOVERY) + return true; + + /* + * Some metadata LSNs are initialized to NULL (e.g., the agfl). This is + * handled by recovery and thus safe to ignore here. + */ + if (lsn == NULLCOMMITLSN) + return true; + + valid = xlog_valid_lsn(mp->m_log, lsn); + + /* warn the user about what's gone wrong before verifier failure */ + if (!valid) { + spin_lock(&log->l_icloglock); + xfs_warn(mp, +"Corruption warning: Metadata has LSN (%d:%d) ahead of current LSN (%d:%d). " +"Please unmount and run xfs_repair (>= v4.3) to resolve.", + CYCLE_LSN(lsn), BLOCK_LSN(lsn), + log->l_curr_cycle, log->l_curr_block); + spin_unlock(&log->l_icloglock); + } + + return valid; +} + +bool +xfs_log_in_recovery( + struct xfs_mount *mp) +{ + struct xlog *log = mp->m_log; + + return log->l_flags & XLOG_ACTIVE_RECOVERY; +} |