/* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_types.h" #include "xfs_bit.h" #include "xfs_log.h" #include "xfs_inum.h" #include "xfs_trans.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_dir2.h" #include "xfs_dmapi.h" #include "xfs_mount.h" #include "xfs_error.h" #include "xfs_log_priv.h" #include "xfs_buf_item.h" #include "xfs_bmap_btree.h" #include "xfs_alloc_btree.h" #include "xfs_ialloc_btree.h" #include "xfs_log_recover.h" #include "xfs_trans_priv.h" #include "xfs_dir2_sf.h" #include "xfs_attr_sf.h" #include "xfs_dinode.h" #include "xfs_inode.h" #include "xfs_rw.h" #define xlog_write_adv_cnt(ptr, len, off, bytes) \ { (ptr) += (bytes); \ (len) -= (bytes); \ (off) += (bytes);} /* Local miscellaneous function prototypes */ STATIC int xlog_bdstrat_cb(struct xfs_buf *); STATIC int xlog_commit_record(xfs_mount_t *mp, xlog_ticket_t *ticket, xlog_in_core_t **, xfs_lsn_t *); STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp, xfs_buftarg_t *log_target, xfs_daddr_t blk_offset, int num_bblks); STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes); STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog); STATIC void xlog_dealloc_log(xlog_t *log); STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[], int nentries, xfs_log_ticket_t tic, xfs_lsn_t *start_lsn, xlog_in_core_t **commit_iclog, uint flags); /* local state machine functions */ STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog); STATIC int xlog_state_get_iclog_space(xlog_t *log, int len, xlog_in_core_t **iclog, xlog_ticket_t *ticket, int *continued_write, int *logoffsetp); STATIC void xlog_state_put_ticket(xlog_t *log, xlog_ticket_t *tic); STATIC int xlog_state_release_iclog(xlog_t *log, xlog_in_core_t *iclog); STATIC void xlog_state_switch_iclogs(xlog_t *log, xlog_in_core_t *iclog, int eventual_size); STATIC int xlog_state_sync(xlog_t *log, xfs_lsn_t lsn, uint flags, int *log_flushed); STATIC int xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed); STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); /* local functions to manipulate grant head */ STATIC int xlog_grant_log_space(xlog_t *log, xlog_ticket_t *xtic); STATIC void xlog_grant_push_ail(xfs_mount_t *mp, int need_bytes); STATIC void xlog_regrant_reserve_log_space(xlog_t *log, xlog_ticket_t *ticket); STATIC int xlog_regrant_write_log_space(xlog_t *log, xlog_ticket_t *ticket); STATIC void xlog_ungrant_log_space(xlog_t *log, xlog_ticket_t *ticket); /* local ticket functions */ STATIC void xlog_state_ticket_alloc(xlog_t *log); STATIC xlog_ticket_t *xlog_ticket_get(xlog_t *log, int unit_bytes, int count, char clientid, uint flags); STATIC void xlog_ticket_put(xlog_t *log, xlog_ticket_t *ticket); #if defined(DEBUG) STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr); STATIC void xlog_verify_grant_head(xlog_t *log, int equals); STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, int count, boolean_t syncing); STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, xfs_lsn_t tail_lsn); #else #define xlog_verify_dest_ptr(a,b) #define xlog_verify_grant_head(a,b) #define xlog_verify_iclog(a,b,c,d) #define xlog_verify_tail_lsn(a,b,c) #endif STATIC int xlog_iclogs_empty(xlog_t *log); #if defined(XFS_LOG_TRACE) void xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string) { unsigned long cnts; if (!log->l_grant_trace) { log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP); if (!log->l_grant_trace) return; } /* ticket counts are 1 byte each */ cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8; ktrace_enter(log->l_grant_trace, (void *)tic, (void *)log->l_reserve_headq, (void *)log->l_write_headq, (void *)((unsigned long)log->l_grant_reserve_cycle), (void *)((unsigned long)log->l_grant_reserve_bytes), (void *)((unsigned long)log->l_grant_write_cycle), (void *)((unsigned long)log->l_grant_write_bytes), (void *)((unsigned long)log->l_curr_cycle), (void *)((unsigned long)log->l_curr_block), (void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)), (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)), (void *)string, (void *)((unsigned long)tic->t_trans_type), (void *)cnts, (void *)((unsigned long)tic->t_curr_res), (void *)((unsigned long)tic->t_unit_res)); } void xlog_trace_iclog(xlog_in_core_t *iclog, uint state) { if (!iclog->ic_trace) iclog->ic_trace = ktrace_alloc(256, KM_SLEEP); ktrace_enter(iclog->ic_trace, (void *)((unsigned long)state), (void *)((unsigned long)current_pid()), (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL); } #else #define xlog_trace_loggrant(log,tic,string) #define xlog_trace_iclog(iclog,state) #endif /* XFS_LOG_TRACE */ static void xlog_ins_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) { if (*qp) { tic->t_next = (*qp); tic->t_prev = (*qp)->t_prev; (*qp)->t_prev->t_next = tic; (*qp)->t_prev = tic; } else { tic->t_prev = tic->t_next = tic; *qp = tic; } tic->t_flags |= XLOG_TIC_IN_Q; } static void xlog_del_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) { if (tic == tic->t_next) { *qp = NULL; } else { *qp = tic->t_next; tic->t_next->t_prev = tic->t_prev; tic->t_prev->t_next = tic->t_next; } tic->t_next = tic->t_prev = NULL; tic->t_flags &= ~XLOG_TIC_IN_Q; } static void xlog_grant_sub_space(struct log *log, int bytes) { log->l_grant_write_bytes -= bytes; if (log->l_grant_write_bytes < 0) { log->l_grant_write_bytes += log->l_logsize; log->l_grant_write_cycle--; } log->l_grant_reserve_bytes -= bytes; if ((log)->l_grant_reserve_bytes < 0) { log->l_grant_reserve_bytes += log->l_logsize; log->l_grant_reserve_cycle--; } } static void xlog_grant_add_space_write(struct log *log, int bytes) { log->l_grant_write_bytes += bytes; if (log->l_grant_write_bytes > log->l_logsize) { log->l_grant_write_bytes -= log->l_logsize; log->l_grant_write_cycle++; } } static void xlog_grant_add_space_reserve(struct log *log, int bytes) { log->l_grant_reserve_bytes += bytes; if (log->l_grant_reserve_bytes > log->l_logsize) { log->l_grant_reserve_bytes -= log->l_logsize; log->l_grant_reserve_cycle++; } } static inline void xlog_grant_add_space(struct log *log, int bytes) { xlog_grant_add_space_write(log, bytes); xlog_grant_add_space_reserve(log, bytes); } 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++; } /* * 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(xfs_mount_t *mp, xfs_log_ticket_t xtic, void **iclog, uint flags) { xlog_t *log = mp->m_log; xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic; 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(mp, ticket, (xlog_in_core_t **)iclog, &lsn)))) { lsn = (xfs_lsn_t) -1; if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { flags |= XFS_LOG_REL_PERM_RESERV; } } if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || (flags & XFS_LOG_REL_PERM_RESERV)) { /* * Release ticket if not permanent reservation or a specific * request has been made to release a permanent reservation. */ xlog_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)"); xlog_ungrant_log_space(log, ticket); xlog_state_put_ticket(log, ticket); } else { xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)"); 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. */ if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) && (flags & XFS_LOG_REL_PERM_RESERV) == 0) ticket->t_flags |= XLOG_TIC_INITED; return lsn; } /* xfs_log_done */ /* * Force the in-core log to disk. If flags == XFS_LOG_SYNC, * the force is done synchronously. * * Asynchronous forces are implemented by setting the WANT_SYNC * bit in the appropriate in-core log and then returning. * * Synchronous forces are implemented with a semaphore. All callers * to force a given lsn to disk will wait on a semaphore 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 * semaphore. */ int _xfs_log_force( xfs_mount_t *mp, xfs_lsn_t lsn, uint flags, int *log_flushed) { xlog_t *log = mp->m_log; int dummy; if (!log_flushed) log_flushed = &dummy; ASSERT(flags & XFS_LOG_FORCE); XFS_STATS_INC(xs_log_force); if (log->l_flags & XLOG_IO_ERROR) return XFS_ERROR(EIO); if (lsn == 0) return xlog_state_sync_all(log, flags, log_flushed); else return xlog_state_sync(log, lsn, flags, log_flushed); } /* xfs_log_force */ /* * 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(xfs_mount_t *mp, /* mount of partition */ void *iclog_hndl, /* iclog to hang callback off */ xfs_log_callback_t *cb) { xlog_t *log = mp->m_log; xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; int abortflg; cb->cb_next = NULL; spin_lock(&log->l_icloglock); 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(&log->l_icloglock); return abortflg; } /* xfs_log_notify */ int xfs_log_release_iclog(xfs_mount_t *mp, void *iclog_hndl) { xlog_t *log = mp->m_log; xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; if (xlog_state_release_iclog(log, iclog)) { xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); return EIO; } return 0; } /* * 1. Reserve an amount of on-disk log space and return a ticket corresponding * to the reservation. * 2. Potentially, push buffers at tail of log to disk. * * 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(xfs_mount_t *mp, int unit_bytes, int cnt, xfs_log_ticket_t *ticket, __uint8_t client, uint flags, uint t_type) { xlog_t *log = mp->m_log; xlog_ticket_t *internal_ticket; int retval = 0; ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); ASSERT((flags & XFS_LOG_NOSLEEP) == 0); if (XLOG_FORCED_SHUTDOWN(log)) return XFS_ERROR(EIO); XFS_STATS_INC(xs_try_logspace); if (*ticket != NULL) { ASSERT(flags & XFS_LOG_PERM_RESERV); internal_ticket = (xlog_ticket_t *)*ticket; xlog_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)"); xlog_grant_push_ail(mp, internal_ticket->t_unit_res); retval = xlog_regrant_write_log_space(log, internal_ticket); } else { /* may sleep if need to allocate more tickets */ internal_ticket = xlog_ticket_get(log, unit_bytes, cnt, client, flags); internal_ticket->t_trans_type = t_type; *ticket = internal_ticket; xlog_trace_loggrant(log, internal_ticket, (internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ? "xfs_log_reserve: create new ticket (permanent trans)" : "xfs_log_reserve: create new ticket"); xlog_grant_push_ail(mp, (internal_ticket->t_unit_res * internal_ticket->t_cnt)); retval = xlog_grant_log_space(log, internal_ticket); } return retval; } /* xfs_log_reserve */ /* * Mount a log filesystem * * mp - ubiquitous xfs mount point structure * log_target - buftarg of on-disk log device * blk_offset - Start block # where block size is 512 bytes (BBSIZE) * num_bblocks - Number of BBSIZE blocks in on-disk log * * Return error or zero. */ int xfs_log_mount( xfs_mount_t *mp, xfs_buftarg_t *log_target, xfs_daddr_t blk_offset, int num_bblks) { int error; if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); else { cmn_err(CE_NOTE, "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", mp->m_fsname); ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); } mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); /* * Initialize the AIL now we have a log. */ spin_lock_init(&mp->m_ail_lock); error = xfs_trans_ail_init(mp); if (error) { cmn_err(CE_WARN, "XFS: AIL initialisation failed: error %d", error); goto error; } /* * 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) { cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); goto error; } } /* Normal transactions can now occur */ mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; /* End mounting message in xfs_log_mount_finish */ return 0; error: xfs_log_unmount_dealloc(mp); return error; } /* xfs_log_mount */ /* * 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. * * mp - ubiquitous xfs mount point structure */ int xfs_log_mount_finish(xfs_mount_t *mp, int mfsi_flags) { int error; if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) error = xlog_recover_finish(mp->m_log, mfsi_flags); else { error = 0; ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); } return error; } /* * Unmount processing for the log. */ int xfs_log_unmount(xfs_mount_t *mp) { int error; error = xfs_log_unmount_write(mp); xfs_log_unmount_dealloc(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. */ /* * 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 "nUmount" is a bit foo. * As far as I know, there weren't any dependencies on the old behaviour. */ int xfs_log_unmount_write(xfs_mount_t *mp) { xlog_t *log = mp->m_log; xlog_in_core_t *iclog; #ifdef DEBUG xlog_in_core_t *first_iclog; #endif xfs_log_iovec_t reg[1]; xfs_log_ticket_t tic = NULL; xfs_lsn_t lsn; int error; /* the data section must be 32 bit size aligned */ struct { __uint16_t magic; __uint16_t pad1; __uint32_t pad2; /* may as well make it 64 bits */ } magic = { XLOG_UNMOUNT_TYPE, 0, 0 }; /* * Don't write out unmount record on read-only mounts. * Or, if we are doing a forced umount (typically because of IO errors). */ if (mp->m_flags & XFS_MOUNT_RDONLY) return 0; xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC); #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))) { reg[0].i_addr = (void*)&magic; reg[0].i_len = sizeof(magic); XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_UNMOUNT); error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); if (!error) { /* remove inited flag */ ((xlog_ticket_t *)tic)->t_flags = 0; error = xlog_write(mp, reg, 1, tic, &lsn, NULL, XLOG_UNMOUNT_TRANS); /* * At this point, we're umounting anyway, * so there's no point in transitioning log state * to IOERROR. Just continue... */ } if (error) { xfs_fs_cmn_err(CE_ALERT, mp, "xfs_log_unmount: unmount record failed"); } spin_lock(&log->l_icloglock); iclog = log->l_iclog; iclog->ic_refcnt++; spin_unlock(&log->l_icloglock); xlog_state_want_sync(log, iclog); (void) xlog_state_release_iclog(log, iclog); spin_lock(&log->l_icloglock); if (!(iclog->ic_state == XLOG_STATE_ACTIVE || iclog->ic_state == XLOG_STATE_DIRTY)) { if (!XLOG_FORCED_SHUTDOWN(log)) { sv_wait(&iclog->ic_forcesema, PMEM, &log->l_icloglock, s); } else { spin_unlock(&log->l_icloglock); } } else { spin_unlock(&log->l_icloglock); } if (tic) { xlog_trace_loggrant(log, tic, "unmount rec"); xlog_ungrant_log_space(log, tic); xlog_state_put_ticket(log, tic); } } else { /* * We're already in forced_shutdown mode, couldn't * even attempt to write out the unmount transaction. * * Go through the motions of sync'ing and releasing * the iclog, even though no I/O will actually happen, * we need to wait for other log I/Os that may already * be in progress. Do this as a separate section of * code so we'll know if we ever get stuck here that * we're in this odd situation of trying to unmount * a file system that went into forced_shutdown as * the result of an unmount.. */ spin_lock(&log->l_icloglock); iclog = log->l_iclog; iclog->ic_refcnt++; spin_unlock(&log->l_icloglock); xlog_state_want_sync(log, iclog); (void) 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) ) { sv_wait(&iclog->ic_forcesema, PMEM, &log->l_icloglock, s); } else { spin_unlock(&log->l_icloglock); } } return 0; } /* xfs_log_unmount_write */ /* * Deallocate log structures for unmount/relocation. * * We need to stop the aild from running before we destroy * and deallocate the log as the aild references the log. */ void xfs_log_unmount_dealloc(xfs_mount_t *mp) { xfs_trans_ail_destroy(mp); xlog_dealloc_log(mp->m_log); } /* * Write region vectors to log. The write happens using the space reservation * of the ticket (tic). It is not a requirement that all writes for a given * transaction occur with one call to xfs_log_write(). */ int xfs_log_write(xfs_mount_t * mp, xfs_log_iovec_t reg[], int nentries, xfs_log_ticket_t tic, xfs_lsn_t *start_lsn) { int error; xlog_t *log = mp->m_log; if (XLOG_FORCED_SHUTDOWN(log)) return XFS_ERROR(EIO); if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) { xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); } return error; } /* xfs_log_write */ void xfs_log_move_tail(xfs_mount_t *mp, xfs_lsn_t tail_lsn) { xlog_ticket_t *tic; xlog_t *log = mp->m_log; int need_bytes, free_bytes, cycle, bytes; if (XLOG_FORCED_SHUTDOWN(log)) return; if (tail_lsn == 0) { /* needed since sync_lsn is 64 bits */ spin_lock(&log->l_icloglock); tail_lsn = log->l_last_sync_lsn; spin_unlock(&log->l_icloglock); } spin_lock(&log->l_grant_lock); /* Also an invalid lsn. 1 implies that we aren't passing in a valid * tail_lsn. */ if (tail_lsn != 1) { log->l_tail_lsn = tail_lsn; } if ((tic = log->l_write_headq)) { #ifdef DEBUG if (log->l_flags & XLOG_ACTIVE_RECOVERY) panic("Recovery problem"); #endif cycle = log->l_grant_write_cycle; bytes = log->l_grant_write_bytes; free_bytes = xlog_space_left(log, cycle, bytes); do { ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); if (free_bytes < tic->t_unit_res && tail_lsn != 1) break; tail_lsn = 0; free_bytes -= tic->t_unit_res; sv_signal(&tic->t_sema); tic = tic->t_next; } while (tic != log->l_write_headq); } if ((tic = log->l_reserve_headq)) { #ifdef DEBUG if (log->l_flags & XLOG_ACTIVE_RECOVERY) panic("Recovery problem"); #endif cycle = log->l_grant_reserve_cycle; bytes = log->l_grant_reserve_bytes; free_bytes = xlog_space_left(log, cycle, bytes); do { if (tic->t_flags & XLOG_TIC_PERM_RESERV) need_bytes = tic->t_unit_res*tic->t_cnt; else need_bytes = tic->t_unit_res; if (free_bytes < need_bytes && tail_lsn != 1) break; tail_lsn = 0; free_bytes -= need_bytes; sv_signal(&tic->t_sema); tic = tic->t_next; } while (tic != log->l_reserve_headq); } spin_unlock(&log->l_grant_lock); } /* xfs_log_move_tail */ /* * Determine if we have a transaction that has gone to disk * that needs to be covered. Log activity needs to be idle (no AIL and * nothing in the iclogs). And, we need to be in the right state indicating * something has gone out. */ int xfs_log_need_covered(xfs_mount_t *mp) { int needed = 0, gen; xlog_t *log = mp->m_log; if (!xfs_fs_writable(mp)) return 0; spin_lock(&log->l_icloglock); if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || (log->l_covered_state == XLOG_STATE_COVER_NEED2)) && !xfs_trans_first_ail(mp, &gen) && xlog_iclogs_empty(log)) { if (log->l_covered_state == XLOG_STATE_COVER_NEED) log->l_covered_state = XLOG_STATE_COVER_DONE; else { ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); log->l_covered_state = XLOG_STATE_COVER_DONE2; } needed = 1; } spin_unlock(&log->l_icloglock); return needed; } /****************************************************************************** * * local routines * ****************************************************************************** */ /* xfs_trans_tail_ail returns 0 when there is nothing in the list. * The log manager must keep track of the last LR which was committed * to disk. The lsn of this LR will become the new tail_lsn whenever * xfs_trans_tail_ail returns 0. If we don't do this, we run into * the situation where stuff could be written into the log but nothing * was ever in the AIL when asked. Eventually, we panic since the * tail hits the head. * * We may be holding the log iclog lock upon entering this routine. */ xfs_lsn_t xlog_assign_tail_lsn(xfs_mount_t *mp) { xfs_lsn_t tail_lsn; xlog_t *log = mp->m_log; tail_lsn = xfs_trans_tail_ail(mp); spin_lock(&log->l_grant_lock); if (tail_lsn != 0) { log->l_tail_lsn = tail_lsn; } else { tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; } spin_unlock(&log->l_grant_lock); return tail_lsn; } /* xlog_assign_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(xlog_t *log, int cycle, int bytes) { int free_bytes; int tail_bytes; int tail_cycle; tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); tail_cycle = CYCLE_LSN(log->l_tail_lsn); if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { free_bytes = log->l_logsize - (bytes - tail_bytes); } else if ((tail_cycle + 1) < cycle) { return 0; } else if (tail_cycle < cycle) { ASSERT(tail_cycle == (cycle - 1)); free_bytes = tail_bytes - 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_fs_cmn_err(CE_ALERT, log->l_mp, "xlog_space_left: head behind tail\n" " tail_cycle = %d, tail_bytes = %d\n" " GH cycle = %d, GH bytes = %d", tail_cycle, tail_bytes, cycle, bytes); ASSERT(0); free_bytes = log->l_logsize; } return free_bytes; } /* xlog_space_left */ /* * Log function which is called when an io completes. * * The log manager needs its own routine, in order to control what * happens with the buffer after the write completes. */ void xlog_iodone(xfs_buf_t *bp) { xlog_in_core_t *iclog; xlog_t *l; int aborted; iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); aborted = 0; /* * Some versions of cpp barf on the recursive definition of * ic_log -> hic_fields.ic_log and expand ic_log twice when * it is passed through two macros. Workaround broken cpp. */ l = iclog->ic_log; /* * If the ordered flag has been removed by a lower * layer, it means the underlyin device no longer supports * barrier I/O. Warn loudly and turn off barriers. */ if ((l->l_mp->m_flags & XFS_MOUNT_BARRIER) && !XFS_BUF_ORDERED(bp)) { l->l_mp->m_flags &= ~XFS_MOUNT_BARRIER; xfs_fs_cmn_err(CE_WARN, l->l_mp, "xlog_iodone: Barriers are no longer supported" " by device. Disabling barriers\n"); xfs_buftrace("XLOG_IODONE BARRIERS OFF", bp); } /* * Race to shutdown the filesystem if we see an error. */ if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); XFS_BUF_STALE(bp); xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); /* * This flag will be propagated to the trans-committed * callback routines to let them know that the log-commit * didn't succeed. */ aborted = XFS_LI_ABORTED; } else if (iclog->ic_state & XLOG_STATE_IOERROR) { aborted = XFS_LI_ABORTED; } /* log I/O is always issued ASYNC */ ASSERT(XFS_BUF_ISASYNC(bp)); xlog_state_done_syncing(iclog, aborted); /* * do not reference the buffer (bp) here as we could race * with it being freed after writing the unmount record to the * log. */ } /* xlog_iodone */ /* * 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. */ STATIC int xlog_bdstrat_cb(struct xfs_buf *bp) { xlog_in_core_t *iclog; iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) { /* note for irix bstrat will need struct bdevsw passed * Fix the following macro if the code ever is merged */ XFS_bdstrat(bp); return 0; } xfs_buftrace("XLOG__BDSTRAT IOERROR", bp); XFS_BUF_ERROR(bp, EIO); XFS_BUF_STALE(bp); xfs_biodone(bp); return XFS_ERROR(EIO); } /* * 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(xfs_mount_t *mp, xlog_t *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; /* * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers. */ if (mp->m_sb.sb_blocksize >= 16*1024) { log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; if (mp->m_logbufs <= 0) { switch (mp->m_sb.sb_blocksize) { case 16*1024: /* 16 KB */ log->l_iclog_bufs = 3; break; case 32*1024: /* 32 KB */ log->l_iclog_bufs = 4; break; case 64*1024: /* 64 KB */ log->l_iclog_bufs = 8; break; default: xlog_panic("XFS: Invalid blocksize"); break; } } } 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 */ /* * 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 xlog_t * xlog_alloc_log(xfs_mount_t *mp, xfs_buftarg_t *log_target, xfs_daddr_t blk_offset, int num_bblks) { xlog_t *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 iclogsize; log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP); 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; log->l_prev_block = -1; log->l_tail_lsn = xlog_assign_lsn(1, 0); /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ log->l_last_sync_lsn = log->l_tail_lsn; log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ log->l_grant_reserve_cycle = 1; log->l_grant_write_cycle = 1; if (xfs_sb_version_hassector(&mp->m_sb)) { log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; ASSERT(log->l_sectbb_log <= mp->m_sectbb_log); /* for larger sector sizes, must have v2 or external log */ ASSERT(log->l_sectbb_log == 0 || log->l_logBBstart == 0 || xfs_sb_version_haslogv2(&mp->m_sb)); ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT); } log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; xlog_get_iclog_buffer_size(mp, log); bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); ASSERT(XFS_BUF_ISBUSY(bp)); ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); log->l_xbuf = bp; spin_lock_init(&log->l_icloglock); spin_lock_init(&log->l_grant_lock); initnsema(&log->l_flushsema, 0, "ic-flush"); xlog_state_ticket_alloc(log); /* wait until after icloglock inited */ /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); 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. */ iclogsize = log->l_iclog_size; ASSERT(log->l_iclog_size >= 4096); for (i=0; i < log->l_iclog_bufs; i++) { *iclogp = (xlog_in_core_t *) kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP); iclog = *iclogp; iclog->ic_prev = prev_iclog; prev_iclog = iclog; bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp); if (!XFS_BUF_CPSEMA(bp)) ASSERT(0); XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); iclog->ic_bp = bp; iclog->hic_data = bp->b_addr; log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); 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 = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; iclog->ic_state = XLOG_STATE_ACTIVE; iclog->ic_log = log; iclog->ic_callback_tail = &(iclog->ic_callback); iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize; ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force"); sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write"); iclogp = &iclog->ic_next; } *iclogp = log->l_iclog; /* complete ring */ log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ return log; } /* 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(xfs_mount_t *mp, xlog_ticket_t *ticket, xlog_in_core_t **iclog, xfs_lsn_t *commitlsnp) { int error; xfs_log_iovec_t reg[1]; reg[0].i_addr = NULL; reg[0].i_len = 0; XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_COMMIT); ASSERT_ALWAYS(iclog); if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, iclog, XLOG_COMMIT_TRANS))) { xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); } return error; } /* xlog_commit_record */ /* * 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(xfs_mount_t *mp, int need_bytes) { xlog_t *log = mp->m_log; /* pointer to the log */ xfs_lsn_t tail_lsn; /* lsn of the log tail */ xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ int free_blocks; /* free blocks left to write to */ int free_bytes; /* free bytes left to write to */ int threshold_block; /* block in lsn we'd like to be at */ int threshold_cycle; /* lsn cycle we'd like to be at */ int free_threshold; ASSERT(BTOBB(need_bytes) < log->l_logBBsize); spin_lock(&log->l_grant_lock); free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, log->l_grant_reserve_bytes); tail_lsn = log->l_tail_lsn; 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) { threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; threshold_cycle = CYCLE_LSN(tail_lsn); 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. */ if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) threshold_lsn = log->l_last_sync_lsn; } spin_unlock(&log->l_grant_lock); /* * 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 (threshold_lsn && !XLOG_FORCED_SHUTDOWN(log)) xfs_trans_push_ail(mp, threshold_lsn); } /* xlog_grant_push_ail */ /* * 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(xlog_t *log, xlog_in_core_t *iclog) { xfs_caddr_t dptr; /* pointer to byte sized element */ 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); XFS_STATS_INC(xs_log_writes); ASSERT(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 */ spin_lock(&log->l_grant_lock); xlog_grant_add_space(log, roundoff); spin_unlock(&log->l_grant_lock); /* put cycle number in every block */ xlog_pack_data(log, iclog, roundoff); /* real byte length */ if (v2) { iclog->ic_header.h_len = cpu_to_be32(iclog->ic_offset + roundoff); } else { iclog->ic_header.h_len = cpu_to_be32(iclog->ic_offset); } bp = iclog->ic_bp; ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn))); XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); /* Do we need to split this write into 2 parts? */ if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); iclog->ic_bwritecnt = 2; /* split into 2 writes */ } else { iclog->ic_bwritecnt = 1; } XFS_BUF_SET_COUNT(bp, count); XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ XFS_BUF_ZEROFLAGS(bp); XFS_BUF_BUSY(bp); XFS_BUF_ASYNC(bp); /* * Do an ordered write for the log block. * Its unnecessary to flush the first split block in the log wrap case. */ if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER)) XFS_BUF_ORDERED(bp); 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, B_TRUE); /* account for log which doesn't start at block #0 */ XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); /* * Don't call xfs_bwrite here. We do log-syncs even when the filesystem * is shutting down. */ XFS_BUF_WRITE(bp); if ((error = XFS_bwrite(bp))) { xfs_ioerror_alert("xlog_sync", log->l_mp, bp, XFS_BUF_ADDR(bp)); return error; } if (split) { bp = iclog->ic_log->l_xbuf; ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ (__psint_t)count), split); XFS_BUF_SET_FSPRIVATE(bp, iclog); XFS_BUF_ZEROFLAGS(bp); XFS_BUF_BUSY(bp); XFS_BUF_ASYNC(bp); if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) XFS_BUF_ORDERED(bp); dptr = XFS_BUF_PTR(bp); /* * Bump the cycle numbers at the start of each block * since this part of the buffer is at the start of * a new cycle. Watch out for the header magic number * case, though. */ for (i = 0; i < split; i += BBSIZE) { be32_add_cpu((__be32 *)dptr, 1); if (be32_to_cpu(*(__be32 *)dptr) == XLOG_HEADER_MAGIC_NUM) be32_add_cpu((__be32 *)dptr, 1); dptr += BBSIZE; } ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); /* account for internal log which doesn't start at block #0 */ XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); XFS_BUF_WRITE(bp); if ((error = XFS_bwrite(bp))) { xfs_ioerror_alert("xlog_sync (split)", log->l_mp, bp, XFS_BUF_ADDR(bp)); return error; } } return 0; } /* xlog_sync */ /* * Deallocate a log structure */ STATIC void xlog_dealloc_log(xlog_t *log) { xlog_in_core_t *iclog, *next_iclog; xlog_ticket_t *tic, *next_tic; int i; iclog = log->l_iclog; for (i=0; i<log->l_iclog_bufs; i++) { sv_destroy(&iclog->ic_forcesema); sv_destroy(&iclog->ic_writesema); xfs_buf_free(iclog->ic_bp); #ifdef XFS_LOG_TRACE if (iclog->ic_trace != NULL) { ktrace_free(iclog->ic_trace); } #endif next_iclog = iclog->ic_next; kmem_free(iclog, sizeof(xlog_in_core_t)); iclog = next_iclog; } freesema(&log->l_flushsema); spinlock_destroy(&log->l_icloglock); spinlock_destroy(&log->l_grant_lock); /* XXXsup take a look at this again. */ if ((log->l_ticket_cnt != log->l_ticket_tcnt) && !XLOG_FORCED_SHUTDOWN(log)) { xfs_fs_cmn_err(CE_WARN, log->l_mp, "xlog_dealloc_log: (cnt: %d, total: %d)", log->l_ticket_cnt, log->l_ticket_tcnt); /* ASSERT(log->l_ticket_cnt == log->l_ticket_tcnt); */ } else { tic = log->l_unmount_free; while (tic) { next_tic = tic->t_next; kmem_free(tic, PAGE_SIZE); tic = next_tic; } } xfs_buf_free(log->l_xbuf); #ifdef XFS_LOG_TRACE if (log->l_trace != NULL) { ktrace_free(log->l_trace); } if (log->l_grant_trace != NULL) { ktrace_free(log->l_grant_trace); } #endif log->l_mp->m_log = NULL; kmem_free(log, sizeof(xlog_t)); } /* xlog_dealloc_log */ /* * Update counters atomically now that memcpy is done. */ /* ARGSUSED */ static inline void xlog_state_finish_copy(xlog_t *log, xlog_in_core_t *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 */ STATIC void xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket) { uint i; uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); /* match with XLOG_REG_TYPE_* in xfs_log.h */ static char *res_type_str[XLOG_REG_TYPE_MAX] = { "bformat", "bchunk", "efi_format", "efd_format", "iformat", "icore", "iext", "ibroot", "ilocal", "iattr_ext", "iattr_broot", "iattr_local", "qformat", "dquot", "quotaoff", "LR header", "unmount", "commit", "trans header" }; static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { "SETATTR_NOT_SIZE", "SETATTR_SIZE", "INACTIVE", "CREATE", "CREATE_TRUNC", "TRUNCATE_FILE", "REMOVE", "LINK", "RENAME", "MKDIR", "RMDIR", "SYMLINK", "SET_DMATTRS", "GROWFS", "STRAT_WRITE", "DIOSTRAT", "WRITE_SYNC", "WRITEID", "ADDAFORK", "ATTRINVAL", "ATRUNCATE", "ATTR_SET", "ATTR_RM", "ATTR_FLAG", "CLEAR_AGI_BUCKET", "QM_SBCHANGE", "DUMMY1", "DUMMY2", "QM_QUOTAOFF", "QM_DQALLOC", "QM_SETQLIM", "QM_DQCLUSTER", "QM_QINOCREATE", "QM_QUOTAOFF_END", "SB_UNIT", "FSYNC_TS", "GROWFSRT_ALLOC", "GROWFSRT_ZERO", "GROWFSRT_FREE", "SWAPEXT" }; xfs_fs_cmn_err(CE_WARN, mp, "xfs_log_write: reservation summary:\n" " trans type = %s (%u)\n" " unit res = %d bytes\n" " current res = %d bytes\n" " total reg = %u bytes (o/flow = %u bytes)\n" " ophdrs = %u (ophdr space = %u bytes)\n" " ophdr + reg = %u bytes\n" " num regions = %u\n", ((ticket->t_trans_type <= 0 || ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), ticket->t_trans_type, ticket->t_unit_res, ticket->t_curr_res, ticket->t_res_arr_sum, ticket->t_res_o_flow, ticket->t_res_num_ophdrs, ophdr_spc, ticket->t_res_arr_sum + ticket->t_res_o_flow + ophdr_spc, ticket->t_res_num); for (i = 0; i < ticket->t_res_num; i++) { uint r_type = ticket->t_res_arr[i].r_type; cmn_err(CE_WARN, "region[%u]: %s - %u bytes\n", i, ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? "bad-rtype" : res_type_str[r_type-1]), ticket->t_res_arr[i].r_len); } } /* * 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. */ STATIC int xlog_write(xfs_mount_t * mp, xfs_log_iovec_t reg[], int nentries, xfs_log_ticket_t tic, xfs_lsn_t *start_lsn, xlog_in_core_t **commit_iclog, uint flags) { xlog_t *log = mp->m_log; xlog_ticket_t *ticket = (xlog_ticket_t *)tic; xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */ xlog_op_header_t *logop_head; /* ptr to log operation header */ __psint_t ptr; /* copy address into data region */ int len; /* # xlog_write() bytes 2 still copy */ int index; /* region index currently copying */ int log_offset; /* offset (from 0) into data region */ int start_rec_copy; /* # bytes to copy for start record */ int partial_copy; /* did we split a region? */ int partial_copy_len;/* # bytes copied if split region */ int need_copy; /* # bytes need to memcpy this region */ int copy_len; /* # bytes actually memcpy'ing */ int copy_off; /* # bytes from entry start */ int contwr; /* continued write of in-core log? */ int error; int record_cnt = 0, data_cnt = 0; partial_copy_len = partial_copy = 0; /* Calculate potential maximum space. Each region gets its own * xlog_op_header_t and may need to be double word aligned. */ len = 0; if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */ len += sizeof(xlog_op_header_t); ticket->t_res_num_ophdrs++; } for (index = 0; index < nentries; index++) { len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ ticket->t_res_num_ophdrs++; len += reg[index].i_len; xlog_tic_add_region(ticket, reg[index].i_len, reg[index].i_type); } contwr = *start_lsn = 0; if (ticket->t_curr_res < len) { xlog_print_tic_res(mp, ticket); #ifdef DEBUG xlog_panic( "xfs_log_write: reservation ran out. Need to up reservation"); #else /* Customer configurable panic */ xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, "xfs_log_write: reservation ran out. Need to up reservation"); /* If we did not panic, shutdown the filesystem */ xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); #endif } else ticket->t_curr_res -= len; for (index = 0; index < nentries; ) { if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, &contwr, &log_offset))) return error; ASSERT(log_offset <= iclog->ic_size - 1); ptr = (__psint_t) ((char *)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 (index < nentries) { ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); start_rec_copy = 0; /* 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. */ if (ticket->t_flags & XLOG_TIC_INITED) { logop_head = (xlog_op_header_t *)ptr; logop_head->oh_tid = cpu_to_be32(ticket->t_tid); logop_head->oh_clientid = ticket->t_clientid; logop_head->oh_len = 0; logop_head->oh_flags = XLOG_START_TRANS; logop_head->oh_res2 = 0; ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ record_cnt++; start_rec_copy = sizeof(xlog_op_header_t); xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); } /* Copy log operation header directly into data section */ logop_head = (xlog_op_header_t *)ptr; logop_head->oh_tid = cpu_to_be32(ticket->t_tid); logop_head->oh_clientid = ticket->t_clientid; logop_head->oh_res2 = 0; /* header copied directly */ xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); /* are we copying a commit or unmount record? */ logop_head->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 (logop_head->oh_clientid) { case XFS_TRANSACTION: case XFS_VOLUME: case XFS_LOG: break; default: xfs_fs_cmn_err(CE_WARN, mp, "Bad XFS transaction clientid 0x%x in ticket 0x%p", logop_head->oh_clientid, tic); return XFS_ERROR(EIO); } /* Partial write last time? => (partial_copy != 0) * need_copy is the amount we'd like to copy if everything could * fit in the current memcpy. */ need_copy = reg[index].i_len - partial_copy_len; copy_off = partial_copy_len; if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ copy_len = need_copy; logop_head->oh_len = cpu_to_be32(copy_len); if (partial_copy) logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); partial_copy_len = partial_copy = 0; } else { /* partial write */ copy_len = iclog->ic_size - log_offset; logop_head->oh_len = cpu_to_be32(copy_len); logop_head->oh_flags |= XLOG_CONTINUE_TRANS; if (partial_copy) logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; partial_copy_len += copy_len; partial_copy++; len += sizeof(xlog_op_header_t); /* from splitting of region */ /* account for new log op header */ ticket->t_curr_res -= sizeof(xlog_op_header_t); ticket->t_res_num_ophdrs++; } xlog_verify_dest_ptr(log, ptr); /* copy region */ ASSERT(copy_len >= 0); memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); xlog_write_adv_cnt(ptr, len, log_offset, copy_len); /* make copy_len total bytes copied, including headers */ copy_len += start_rec_copy + sizeof(xlog_op_header_t); record_cnt++; data_cnt += contwr ? copy_len : 0; if (partial_copy) { /* copied partial region */ /* already marked WANT_SYNC by xlog_state_get_iclog_space */ xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); record_cnt = data_cnt = 0; if ((error = xlog_state_release_iclog(log, iclog))) return error; break; /* don't increment index */ } else { /* copied entire region */ index++; partial_copy_len = partial_copy = 0; if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); record_cnt = data_cnt = 0; xlog_state_want_sync(log, iclog); if (commit_iclog) { ASSERT(flags & XLOG_COMMIT_TRANS); *commit_iclog = iclog; } else if ((error = xlog_state_release_iclog(log, iclog))) return error; if (index == nentries) return 0; /* we are done */ else break; } } /* if (partial_copy) */ } /* while (index < nentries) */ } /* for (index = 0; index < nentries; ) */ ASSERT(len == 0); xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); if (commit_iclog) { ASSERT(flags & XLOG_COMMIT_TRANS); *commit_iclog = iclog; return 0; } return xlog_state_release_iclog(log, iclog); } /* xlog_write */ /***************************************************************************** * * 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 counting semaphore 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(xlog_t *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; iclog->ic_callback = NULL; /* don't need to free */ /* * 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( xlog_t *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( xlog_t *log, int aborted, xlog_in_core_t *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; spin_unlock(&log->l_icloglock); /* l_last_sync_lsn field protected by * l_grant_lock. Don't worry about iclog's lsn. * No one else can be here except us. */ spin_lock(&log->l_grant_lock); ASSERT(XFS_LSN_CMP(log->l_last_sync_lsn, be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); log->l_last_sync_lsn = be64_to_cpu(iclog->ic_header.h_lsn); spin_unlock(&log->l_grant_lock); /* * 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(&log->l_icloglock); } else { ioerrors++; } cb = iclog->ic_callback; while (cb) { iclog->ic_callback_tail = &(iclog->ic_callback); iclog->ic_callback = NULL; spin_unlock(&log->l_icloglock); /* 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(&log->l_icloglock); cb = iclog->ic_callback; } loopdidcallbacks++; funcdidcallbacks++; ASSERT(iclog->ic_callback == NULL); 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() */ sv_broadcast(&iclog->ic_forcesema); iclog = iclog->ic_next; } while (first_iclog != iclog); if (repeats > 5000) { flushcnt += repeats; repeats = 0; xfs_fs_cmn_err(CE_WARN, log->l_mp, "%s: possible infinite loop (%d iterations)", __FUNCTION__, flushcnt); } } while (!ioerrors && loopdidcallbacks); /* * make one last gasp attempt to see if iclogs are being left in * limbo.. */ #ifdef DEBUG if (funcdidcallbacks) { first_iclog = iclog = log->l_iclog; do { ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); /* * Terminate the loop if iclogs are found in states * which will cause other threads to clean up iclogs. * * SYNCING - i/o completion will go through logs * DONE_SYNC - interrupt thread should be waiting for * l_icloglock * IOERROR - give up hope all ye who enter here */ if (iclog->ic_state == XLOG_STATE_WANT_SYNC || iclog->ic_state == XLOG_STATE_SYNCING || iclog->ic_state == XLOG_STATE_DONE_SYNC || iclog->ic_state == XLOG_STATE_IOERROR ) break; iclog = iclog->ic_next; } while (first_iclog != iclog); } #endif flushcnt = 0; if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) { flushcnt = log->l_flushcnt; log->l_flushcnt = 0; } spin_unlock(&log->l_icloglock); while (flushcnt--) vsema(&log->l_flushsema); } /* xlog_state_do_callback */ /* * 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. Assume that the calls to cvsema won't * take a long time. At least we know it won't sleep. */ STATIC void xlog_state_done_syncing( xlog_in_core_t *iclog, int aborted) { xlog_t *log = iclog->ic_log; spin_lock(&log->l_icloglock); ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || iclog->ic_state == XLOG_STATE_IOERROR); ASSERT(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. */ sv_broadcast(&iclog->ic_writesema); 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. The flush semaphore is set to the number of in-core buffers and * decremented around disk syncing. Therefore, if all buffers are syncing, * this semaphore will cause new writes to sleep until a sync completes. * Otherwise, this code just does p() followed by v(). This approximates * a sleep/wakeup except we can't race. * * 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(xlog_t *log, int len, xlog_in_core_t **iclogp, xlog_ticket_t *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 XFS_ERROR(EIO); } iclog = log->l_iclog; if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) { log->l_flushcnt++; spin_unlock(&log->l_icloglock); xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH); XFS_STATS_INC(xs_log_noiclogs); /* Ensure that log writes happen */ psema(&log->l_flushsema, PINOD); goto restart; } ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); head = &iclog->ic_header; 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 */ if (iclog->ic_refcnt == 1) { spin_unlock(&log->l_icloglock); if ((error = xlog_state_release_iclog(log, iclog))) return error; } else { iclog->ic_refcnt--; 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 */ /* * Atomically get the log space required for a log ticket. * * Once a ticket gets put onto the reserveq, it will only return after * the needed reservation is satisfied. */ STATIC int xlog_grant_log_space(xlog_t *log, xlog_ticket_t *tic) { int free_bytes; int need_bytes; #ifdef DEBUG xfs_lsn_t tail_lsn; #endif #ifdef DEBUG if (log->l_flags & XLOG_ACTIVE_RECOVERY) panic("grant Recovery problem"); #endif /* Is there space or do we need to sleep? */ spin_lock(&log->l_grant_lock); xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter"); /* something is already sleeping; insert new transaction at end */ if (log->l_reserve_headq) { xlog_ins_ticketq(&log->l_reserve_headq, tic); xlog_trace_loggrant(log, tic, "xlog_grant_log_space: sleep 1"); /* * Gotta check this before going to sleep, while we're * holding the grant lock. */ if (XLOG_FORCED_SHUTDOWN(log)) goto error_return; XFS_STATS_INC(xs_sleep_logspace); sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); /* * If we got an error, and the filesystem is shutting down, * we'll catch it down below. So just continue... */ xlog_trace_loggrant(log, tic, "xlog_grant_log_space: wake 1"); spin_lock(&log->l_grant_lock); } if (tic->t_flags & XFS_LOG_PERM_RESERV) need_bytes = tic->t_unit_res*tic->t_ocnt; else need_bytes = tic->t_unit_res; redo: if (XLOG_FORCED_SHUTDOWN(log)) goto error_return; free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, log->l_grant_reserve_bytes); if (free_bytes < need_bytes) { if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) xlog_ins_ticketq(&log->l_reserve_headq, tic); xlog_trace_loggrant(log, tic, "xlog_grant_log_space: sleep 2"); XFS_STATS_INC(xs_sleep_logspace); sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); if (XLOG_FORCED_SHUTDOWN(log)) { spin_lock(&log->l_grant_lock); goto error_return; } xlog_trace_loggrant(log, tic, "xlog_grant_log_space: wake 2"); xlog_grant_push_ail(log->l_mp, need_bytes); spin_lock(&log->l_grant_lock); goto redo; } else if (tic->t_flags & XLOG_TIC_IN_Q) xlog_del_ticketq(&log->l_reserve_headq, tic); /* we've got enough space */ xlog_grant_add_space(log, need_bytes); #ifdef DEBUG tail_lsn = log->l_tail_lsn; /* * 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. */ if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); } #endif xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit"); xlog_verify_grant_head(log, 1); spin_unlock(&log->l_grant_lock); return 0; error_return: if (tic->t_flags & XLOG_TIC_IN_Q) xlog_del_ticketq(&log->l_reserve_headq, tic); xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret"); /* * 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. */ spin_unlock(&log->l_grant_lock); return XFS_ERROR(EIO); } /* xlog_grant_log_space */ /* * Replenish the byte reservation required by moving the grant write head. * * */ STATIC int xlog_regrant_write_log_space(xlog_t *log, xlog_ticket_t *tic) { int free_bytes, need_bytes; xlog_ticket_t *ntic; #ifdef DEBUG xfs_lsn_t tail_lsn; #endif tic->t_curr_res = tic->t_unit_res; xlog_tic_reset_res(tic); if (tic->t_cnt > 0) return 0; #ifdef DEBUG if (log->l_flags & XLOG_ACTIVE_RECOVERY) panic("regrant Recovery problem"); #endif spin_lock(&log->l_grant_lock); xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter"); if (XLOG_FORCED_SHUTDOWN(log)) goto error_return; /* 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. */ if ((ntic = log->l_write_headq)) { free_bytes = xlog_space_left(log, log->l_grant_write_cycle, log->l_grant_write_bytes); do { ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); if (free_bytes < ntic->t_unit_res) break; free_bytes -= ntic->t_unit_res; sv_signal(&ntic->t_sema); ntic = ntic->t_next; } while (ntic != log->l_write_headq); if (ntic != log->l_write_headq) { if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) xlog_ins_ticketq(&log->l_write_headq, tic); xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: sleep 1"); XFS_STATS_INC(xs_sleep_logspace); sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); /* If we're shutting down, this tic is already * off the queue */ if (XLOG_FORCED_SHUTDOWN(log)) { spin_lock(&log->l_grant_lock); goto error_return; } xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: wake 1"); xlog_grant_push_ail(log->l_mp, tic->t_unit_res); spin_lock(&log->l_grant_lock); } } need_bytes = tic->t_unit_res; redo: if (XLOG_FORCED_SHUTDOWN(log)) goto error_return; free_bytes = xlog_space_left(log, log->l_grant_write_cycle, log->l_grant_write_bytes); if (free_bytes < need_bytes) { if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) xlog_ins_ticketq(&log->l_write_headq, tic); XFS_STATS_INC(xs_sleep_logspace); sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); /* If we're shutting down, this tic is already off the queue */ if (XLOG_FORCED_SHUTDOWN(log)) { spin_lock(&log->l_grant_lock); goto error_return; } xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: wake 2"); xlog_grant_push_ail(log->l_mp, need_bytes); spin_lock(&log->l_grant_lock); goto redo; } else if (tic->t_flags & XLOG_TIC_IN_Q) xlog_del_ticketq(&log->l_write_headq, tic); /* we've got enough space */ xlog_grant_add_space_write(log, need_bytes); #ifdef DEBUG tail_lsn = log->l_tail_lsn; if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); } #endif xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit"); xlog_verify_grant_head(log, 1); spin_unlock(&log->l_grant_lock); return 0; error_return: if (tic->t_flags & XLOG_TIC_IN_Q) xlog_del_ticketq(&log->l_reserve_headq, tic); xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret"); /* * 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. */ spin_unlock(&log->l_grant_lock); return XFS_ERROR(EIO); } /* xlog_regrant_write_log_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(xlog_t *log, xlog_ticket_t *ticket) { xlog_trace_loggrant(log, ticket, "xlog_regrant_reserve_log_space: enter"); if (ticket->t_cnt > 0) ticket->t_cnt--; spin_lock(&log->l_grant_lock); xlog_grant_sub_space(log, ticket->t_curr_res); ticket->t_curr_res = ticket->t_unit_res; xlog_tic_reset_res(ticket); xlog_trace_loggrant(log, ticket, "xlog_regrant_reserve_log_space: sub current res"); xlog_verify_grant_head(log, 1); /* just return if we still have some of the pre-reserved space */ if (ticket->t_cnt > 0) { spin_unlock(&log->l_grant_lock); return; } xlog_grant_add_space_reserve(log, ticket->t_unit_res); xlog_trace_loggrant(log, ticket, "xlog_regrant_reserve_log_space: exit"); xlog_verify_grant_head(log, 0); spin_unlock(&log->l_grant_lock); 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(xlog_t *log, xlog_ticket_t *ticket) { if (ticket->t_cnt > 0) ticket->t_cnt--; spin_lock(&log->l_grant_lock); xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter"); xlog_grant_sub_space(log, ticket->t_curr_res); xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current"); /* If this is a permanent reservation ticket, we may be able to free * up more space based on the remaining count. */ if (ticket->t_cnt > 0) { ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt); } xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit"); xlog_verify_grant_head(log, 1); spin_unlock(&log->l_grant_lock); xfs_log_move_tail(log->l_mp, 1); } /* xlog_ungrant_log_space */ /* * Atomically put back used ticket. */ STATIC void xlog_state_put_ticket(xlog_t *log, xlog_ticket_t *tic) { spin_lock(&log->l_icloglock); xlog_ticket_put(log, tic); spin_unlock(&log->l_icloglock); } /* xlog_state_put_ticket */ /* * 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(xlog_t *log, xlog_in_core_t *iclog) { int sync = 0; /* do we sync? */ xlog_assign_tail_lsn(log->l_mp); spin_lock(&log->l_icloglock); if (iclog->ic_state & XLOG_STATE_IOERROR) { spin_unlock(&log->l_icloglock); return XFS_ERROR(EIO); } ASSERT(iclog->ic_refcnt > 0); ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || iclog->ic_state == XLOG_STATE_WANT_SYNC); if (--iclog->ic_refcnt == 0 && iclog->ic_state == XLOG_STATE_WANT_SYNC) { sync++; iclog->ic_state = XLOG_STATE_SYNCING; iclog->ic_header.h_tail_lsn = cpu_to_be64(log->l_tail_lsn); xlog_verify_tail_lsn(log, iclog, log->l_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(xlog_t *log, xlog_in_core_t *iclog, int eventual_size) { ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); if (!eventual_size) eventual_size = iclog->ic_offset; iclog->ic_state = XLOG_STATE_WANT_SYNC; iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); log->l_prev_block = log->l_curr_block; log->l_prev_cycle = log->l_curr_cycle; /* roll log?: ic_offset changed later */ log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); /* Round up to next log-sunit */ if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && log->l_mp->m_sb.sb_logsunit > 1) { __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); log->l_curr_block = roundup(log->l_curr_block, sunit_bb); } if (log->l_curr_block >= log->l_logBBsize) { log->l_curr_cycle++; if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) log->l_curr_cycle++; log->l_curr_block -= log->l_logBBsize; ASSERT(log->l_curr_block >= 0); } ASSERT(iclog == log->l_iclog); log->l_iclog = iclog->ic_next; } /* xlog_state_switch_iclogs */ /* * Write out all data in the in-core log as of this exact moment in time. * * Data may be written to the in-core log during this call. However, * we don't guarantee this data will be written out. A change from past * implementation means this routine will *not* write out zero length LRs. * * Basically, we try and perform an intelligent scan of the in-core logs. * If we determine there is no flushable data, we just return. There is no * flushable data if: * * 1. the current iclog is active and has no data; the previous iclog * is in the active or dirty state. * 2. the current iclog is drity, and the previous iclog is in the * active or dirty state. * * We may sleep (call psema) 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. */ STATIC int xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed) { xlog_in_core_t *iclog; xfs_lsn_t lsn; spin_lock(&log->l_icloglock); iclog = log->l_iclog; if (iclog->ic_state & XLOG_STATE_IOERROR) { spin_unlock(&log->l_icloglock); return XFS_ERROR(EIO); } /* If the head iclog is not active nor dirty, we just attach * ourselves to the head and go to sleep. */ if (iclog->ic_state == XLOG_STATE_ACTIVE || iclog->ic_state == XLOG_STATE_DIRTY) { /* * If the head is dirty or (active and empty), then * we need to look at the previous iclog. If the previous * iclog is active or dirty we are done. There is nothing * to sync out. Otherwise, we attach ourselves to the * previous iclog and go to sleep. */ if (iclog->ic_state == XLOG_STATE_DIRTY || (iclog->ic_refcnt == 0 && iclog->ic_offset == 0)) { iclog = iclog->ic_prev; if (iclog->ic_state == XLOG_STATE_ACTIVE || iclog->ic_state == XLOG_STATE_DIRTY) goto no_sleep; else goto maybe_sleep; } else { if (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. */ 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 XFS_ERROR(EIO); *log_flushed = 1; spin_lock(&log->l_icloglock); if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn && iclog->ic_state != XLOG_STATE_DIRTY) goto maybe_sleep; else goto no_sleep; } else { /* Someone else is writing to this iclog. * Use its call to flush out the data. However, * the other thread may not force out this LR, * so we mark it WANT_SYNC. */ xlog_state_switch_iclogs(log, iclog, 0); goto maybe_sleep; } } } /* By the time we come around again, the iclog could've been filled * which would give it another lsn. If we have a new lsn, just * return because the relevant data has been flushed. */ maybe_sleep: if (flags & XFS_LOG_SYNC) { /* * We must check if we're shutting down here, before * we wait, while we're holding the l_icloglock. * Then we check again after waking up, in case our * sleep was disturbed by a bad news. */ if (iclog->ic_state & XLOG_STATE_IOERROR) { spin_unlock(&log->l_icloglock); return XFS_ERROR(EIO); } XFS_STATS_INC(xs_log_force_sleep); sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s); /* * No need to grab the log lock here since we're * only deciding whether or not to return EIO * and the memory read should be atomic. */ if (iclog->ic_state & XLOG_STATE_IOERROR) return XFS_ERROR(EIO); *log_flushed = 1; } else { no_sleep: spin_unlock(&log->l_icloglock); } return 0; } /* xlog_state_sync_all */ /* * Used by code which implements synchronous log forces. * * 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. * * If filesystem activity goes to zero, the iclog will get flushed only by * bdflush(). */ STATIC int xlog_state_sync(xlog_t *log, xfs_lsn_t lsn, uint flags, int *log_flushed) { xlog_in_core_t *iclog; int already_slept = 0; try_again: spin_lock(&log->l_icloglock); iclog = log->l_iclog; if (iclog->ic_state & XLOG_STATE_IOERROR) { spin_unlock(&log->l_icloglock); return XFS_ERROR(EIO); } do { if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { iclog = iclog->ic_next; continue; } if (iclog->ic_state == XLOG_STATE_DIRTY) { spin_unlock(&log->l_icloglock); return 0; } if (iclog->ic_state == XLOG_STATE_ACTIVE) { /* * We sleep here if we haven't already slept (e.g. * this is the first time we've looked at the correct * iclog buf) and the buffer before us is going to * be sync'ed. The reason for this is that if we * are doing sync transactions here, by waiting for * the previous I/O to complete, we can allow a few * more transactions into this iclog before we close * it down. * * Otherwise, we mark the buffer WANT_SYNC, and bump * up the refcnt so we can release the log (which drops * the ref count). The state switch keeps new transaction * commits from using this buffer. When the current commits * finish writing into the buffer, the refcount will drop to * zero and the buffer will go out then. */ if (!already_slept && (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) { ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); XFS_STATS_INC(xs_log_force_sleep); sv_wait(&iclog->ic_prev->ic_writesema, PSWP, &log->l_icloglock, s); *log_flushed = 1; already_slept = 1; goto try_again; } else { iclog->ic_refcnt++; xlog_state_switch_iclogs(log, iclog, 0); spin_unlock(&log->l_icloglock); if (xlog_state_release_iclog(log, iclog)) return XFS_ERROR(EIO); *log_flushed = 1; spin_lock(&log->l_icloglock); } } if ((flags & XFS_LOG_SYNC) && /* sleep */ !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { /* * Don't wait on the forcesema if we know that we've * gotten a log write error. */ if (iclog->ic_state & XLOG_STATE_IOERROR) { spin_unlock(&log->l_icloglock); return XFS_ERROR(EIO); } XFS_STATS_INC(xs_log_force_sleep); sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s); /* * No need to grab the log lock here since we're * only deciding whether or not to return EIO * and the memory read should be atomic. */ if (iclog->ic_state & XLOG_STATE_IOERROR) return XFS_ERROR(EIO); *log_flushed = 1; } else { /* just return */ spin_unlock(&log->l_icloglock); } return 0; } while (iclog != log->l_iclog); spin_unlock(&log->l_icloglock); return 0; } /* xlog_state_sync */ /* * Called when we want to mark the current iclog as being ready to sync to * disk. */ STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) { spin_lock(&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)); } spin_unlock(&log->l_icloglock); } /* xlog_state_want_sync */ /***************************************************************************** * * TICKET functions * ***************************************************************************** */ /* * Algorithm doesn't take into account page size. ;-( */ STATIC void xlog_state_ticket_alloc(xlog_t *log) { xlog_ticket_t *t_list; xlog_ticket_t *next; xfs_caddr_t buf; uint i = (PAGE_SIZE / sizeof(xlog_ticket_t)) - 2; /* * The kmem_zalloc may sleep, so we shouldn't be holding the * global lock. XXXmiken: may want to use zone allocator. */ buf = (xfs_caddr_t) kmem_zalloc(PAGE_SIZE, KM_SLEEP); spin_lock(&log->l_icloglock); /* Attach 1st ticket to Q, so we can keep track of allocated memory */ t_list = (xlog_ticket_t *)buf; t_list->t_next = log->l_unmount_free; log->l_unmount_free = t_list++; log->l_ticket_cnt++; log->l_ticket_tcnt++; /* Next ticket becomes first ticket attached to ticket free list */ if (log->l_freelist != NULL) { ASSERT(log->l_tail != NULL); log->l_tail->t_next = t_list; } else { log->l_freelist = t_list; } log->l_ticket_cnt++; log->l_ticket_tcnt++; /* Cycle through rest of alloc'ed memory, building up free Q */ for ( ; i > 0; i--) { next = t_list + 1; t_list->t_next = next; t_list = next; log->l_ticket_cnt++; log->l_ticket_tcnt++; } t_list->t_next = NULL; log->l_tail = t_list; spin_unlock(&log->l_icloglock); } /* xlog_state_ticket_alloc */ /* * Put ticket into free list * * Assumption: log lock is held around this call. */ STATIC void xlog_ticket_put(xlog_t *log, xlog_ticket_t *ticket) { sv_destroy(&ticket->t_sema); /* * Don't think caching will make that much difference. It's * more important to make debug easier. */ #if 0 /* real code will want to use LIFO for caching */ ticket->t_next = log->l_freelist; log->l_freelist = ticket; /* no need to clear fields */ #else /* When we debug, it is easier if tickets are cycled */ ticket->t_next = NULL; if (log->l_tail) { log->l_tail->t_next = ticket; } else { ASSERT(log->l_freelist == NULL); log->l_freelist = ticket; } log->l_tail = ticket; #endif /* DEBUG */ log->l_ticket_cnt++; } /* xlog_ticket_put */ /* * Grab ticket off freelist or allocation some more */ STATIC xlog_ticket_t * xlog_ticket_get(xlog_t *log, int unit_bytes, int cnt, char client, uint xflags) { xlog_ticket_t *tic; uint num_headers; alloc: if (log->l_freelist == NULL) xlog_state_ticket_alloc(log); /* potentially sleep */ spin_lock(&log->l_icloglock); if (log->l_freelist == NULL) { spin_unlock(&log->l_icloglock); goto alloc; } tic = log->l_freelist; log->l_freelist = tic->t_next; if (log->l_freelist == NULL) log->l_tail = NULL; log->l_ticket_cnt--; spin_unlock(&log->l_icloglock); /* * 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 */ num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); 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 split-recs - ophdrs added when data split over LRs */ unit_bytes += sizeof(xlog_op_header_t) * num_headers; /* for roundoff padding for transaction data and one for commit record */ if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && log->l_mp->m_sb.sb_logsunit > 1) { /* log su roundoff */ unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; } else { /* BB roundoff */ unit_bytes += 2*BBSIZE; } tic->t_unit_res = unit_bytes; tic->t_curr_res = unit_bytes; tic->t_cnt = cnt; tic->t_ocnt = cnt; tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); tic->t_clientid = client; tic->t_flags = XLOG_TIC_INITED; tic->t_trans_type = 0; if (xflags & XFS_LOG_PERM_RESERV) tic->t_flags |= XLOG_TIC_PERM_RESERV; sv_init(&(tic->t_sema), SV_DEFAULT, "logtick"); xlog_tic_reset_res(tic); return tic; } /* xlog_ticket_get */ /****************************************************************************** * * Log debug routines * ****************************************************************************** */ #if defined(DEBUG) /* * Make sure that the destination ptr is within the valid data region of * one of the iclogs. This uses backup pointers stored in a different * part of the log in case we trash the log structure. */ void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr) { int i; int good_ptr = 0; for (i=0; i < log->l_iclog_bufs; i++) { if (ptr >= (__psint_t)log->l_iclog_bak[i] && ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) good_ptr++; } if (! good_ptr) xlog_panic("xlog_verify_dest_ptr: invalid ptr"); } /* xlog_verify_dest_ptr */ STATIC void xlog_verify_grant_head(xlog_t *log, int equals) { if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { if (equals) ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); else ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); } else { ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); } } /* xlog_verify_grant_head */ /* check if it will fit */ STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *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)) xlog_panic("xlog_verify_tail_lsn: ran out of log space"); } else { ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); if (BLOCK_LSN(tail_lsn) == log->l_prev_block) xlog_panic("xlog_verify_tail_lsn: tail wrapped"); blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; if (blocks < BTOBB(iclog->ic_offset) + 1) xlog_panic("xlog_verify_tail_lsn: ran out of log space"); } } /* 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(xlog_t *log, xlog_in_core_t *iclog, int count, boolean_t syncing) { xlog_op_header_t *ophead; xlog_in_core_t *icptr; xlog_in_core_2_t *xhdr; xfs_caddr_t ptr; xfs_caddr_t base_ptr; __psint_t field_offset; __uint8_t clientid; int len, i, j, k, op_len; int idx; /* check validity of iclog pointers */ spin_lock(&log->l_icloglock); icptr = log->l_iclog; for (i=0; i < log->l_iclog_bufs; i++) { if (icptr == NULL) xlog_panic("xlog_verify_iclog: invalid ptr"); icptr = icptr->ic_next; } if (icptr != log->l_iclog) xlog_panic("xlog_verify_iclog: corrupt iclog ring"); spin_unlock(&log->l_icloglock); /* check log magic numbers */ if (be32_to_cpu(iclog->ic_header.h_magicno) != XLOG_HEADER_MAGIC_NUM) xlog_panic("xlog_verify_iclog: invalid magic num"); ptr = (xfs_caddr_t) &iclog->ic_header; for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count; ptr += BBSIZE) { if (be32_to_cpu(*(__be32 *)ptr) == XLOG_HEADER_MAGIC_NUM) xlog_panic("xlog_verify_iclog: unexpected magic num"); } /* check fields */ len = be32_to_cpu(iclog->ic_header.h_num_logops); ptr = iclog->ic_datap; base_ptr = ptr; ophead = (xlog_op_header_t *)ptr; xhdr = (xlog_in_core_2_t *)&iclog->ic_header; for (i = 0; i < len; i++) { ophead = (xlog_op_header_t *)ptr; /* clientid is only 1 byte */ field_offset = (__psint_t) ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); if (syncing == B_FALSE || (field_offset & 0x1ff)) { clientid = ophead->oh_clientid; } else { idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); clientid = xlog_get_client_id( xhdr[j].hic_xheader.xh_cycle_data[k]); } else { clientid = xlog_get_client_id( iclog->ic_header.h_cycle_data[idx]); } } if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) cmn_err(CE_WARN, "xlog_verify_iclog: " "invalid clientid %d op 0x%p offset 0x%lx", clientid, ophead, (unsigned long)field_offset); /* check length */ field_offset = (__psint_t) ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); if (syncing == B_FALSE || (field_offset & 0x1ff)) { op_len = be32_to_cpu(ophead->oh_len); } else { idx = BTOBBT((__psint_t)&ophead->oh_len - (__psint_t)iclog->ic_datap); if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); } else { op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); } } ptr += sizeof(xlog_op_header_t) + op_len; } } /* xlog_verify_iclog */ #endif /* * Mark all iclogs IOERROR. l_icloglock is held by the caller. */ STATIC int xlog_state_ioerror( xlog_t *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. the filesystem gets marked 'SHUTDOWN' for all interested * parties to find out, 'atomically'. * b. those who're sleeping on log reservations, pinned objects and * other resources get woken up, and be told the bad news. * c. nothing new gets queued up after (a) and (b) are done. * d. if !logerror, flush the iclogs to disk, then seal them off * for business. */ int xfs_log_force_umount( struct xfs_mount *mp, int logerror) { xlog_ticket_t *tic; xlog_t *log; int retval; int dummy; 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; XFS_BUF_DONE(mp->m_sb_bp); return 0; } /* * Somebody could've already done the hard work for us. * No need to get locks for this. */ if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { ASSERT(XLOG_FORCED_SHUTDOWN(log)); return 1; } retval = 0; /* * We must hold both the GRANT lock and the LOG lock, * before we mark the filesystem SHUTDOWN and wake * everybody up to tell the bad news. */ spin_lock(&log->l_grant_lock); spin_lock(&log->l_icloglock); mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; XFS_BUF_DONE(mp->m_sb_bp); /* * This flag is sort of redundant because of the mount flag, but * it's good to maintain the separation between the log and the rest * of XFS. */ log->l_flags |= XLOG_IO_ERROR; /* * If we hit a log error, we want to mark all the iclogs IOERROR * while we're still holding the loglock. */ if (logerror) 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 reserve_headq as well as write_headq. * 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 GRANTLOCK. */ if ((tic = log->l_reserve_headq)) { do { sv_signal(&tic->t_sema); tic = tic->t_next; } while (tic != log->l_reserve_headq); } if ((tic = log->l_write_headq)) { do { sv_signal(&tic->t_sema); tic = tic->t_next; } while (tic != log->l_write_headq); } spin_unlock(&log->l_grant_lock); if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { ASSERT(!logerror); /* * Force the incore logs to disk before shutting the * log down completely. */ xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy); spin_lock(&log->l_icloglock); retval = xlog_state_ioerror(log); spin_unlock(&log->l_icloglock); } /* * Wake up everybody waiting on xfs_log_force. * Callback all log item committed functions as if the * log writes were completed. */ 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(xlog_t *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; }