diff options
Diffstat (limited to 'sys/gnu/fs/xfs/xfs_log.c')
| -rw-r--r-- | sys/gnu/fs/xfs/xfs_log.c | 3708 |
1 files changed, 0 insertions, 3708 deletions
diff --git a/sys/gnu/fs/xfs/xfs_log.c b/sys/gnu/fs/xfs/xfs_log.c deleted file mode 100644 index 46c0d3d..0000000 --- a/sys/gnu/fs/xfs/xfs_log.c +++ /dev/null @@ -1,3708 +0,0 @@ -/* - * 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_dir.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_dir_sf.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); -} - - -/* - * 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, spl; - - cb->cb_next = NULL; - spl = LOG_LOCK(log); - 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); - } - LOG_UNLOCK(log, spl); - 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, XFS_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) -{ - 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(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY); - } - - mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); - - /* - * skip log recovery on a norecovery mount. pretend it all - * just worked. - */ - if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { - int error; - xfs_vfs_t *vfsp = XFS_MTOVFS(mp); - int readonly = (vfsp->vfs_flag & VFS_RDONLY); - - if (readonly) - vfsp->vfs_flag &= ~VFS_RDONLY; - - error = xlog_recover(mp->m_log); - - if (readonly) - vfsp->vfs_flag |= VFS_RDONLY; - if (error) { - cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); - xlog_dealloc_log(mp->m_log); - return error; - } - } - - /* Normal transactions can now occur */ - mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; - - /* End mounting message in xfs_log_mount_finish */ - return 0; -} /* 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(XFS_MTOVFS(mp)->vfs_flag & VFS_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; - SPLDECL(s); - - /* 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 (XFS_MTOVFS(mp)->vfs_flag & VFS_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, 0); - 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"); - } - - - s = LOG_LOCK(log); - iclog = log->l_iclog; - iclog->ic_refcnt++; - LOG_UNLOCK(log, s); - xlog_state_want_sync(log, iclog); - (void) xlog_state_release_iclog(log, iclog); - - s = LOG_LOCK(log); - 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 { - LOG_UNLOCK(log, s); - } - } else { - LOG_UNLOCK(log, s); - } - if (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.. - */ - s = LOG_LOCK(log); - iclog = log->l_iclog; - iclog->ic_refcnt++; - LOG_UNLOCK(log, s); - - xlog_state_want_sync(log, iclog); - (void) xlog_state_release_iclog(log, iclog); - - s = LOG_LOCK(log); - - 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 { - LOG_UNLOCK(log, s); - } - } - - return 0; -} /* xfs_log_unmount_write */ - -/* - * Deallocate log structures for unmount/relocation. - */ -void -xfs_log_unmount_dealloc(xfs_mount_t *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, XFS_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; - SPLDECL(s); - - if (XLOG_FORCED_SHUTDOWN(log)) - return; - ASSERT(!XFS_FORCED_SHUTDOWN(mp)); - - if (tail_lsn == 0) { - /* needed since sync_lsn is 64 bits */ - s = LOG_LOCK(log); - tail_lsn = log->l_last_sync_lsn; - LOG_UNLOCK(log, s); - } - - s = GRANT_LOCK(log); - - /* 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); - } - GRANT_UNLOCK(log, s); -} /* 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) -{ - SPLDECL(s); - int needed = 0, gen; - xlog_t *log = mp->m_log; - xfs_vfs_t *vfsp = XFS_MTOVFS(mp); - - if (/* fs_frozen(vfsp) RMC */ 0 || XFS_FORCED_SHUTDOWN(mp) || - (vfsp->vfs_flag & VFS_RDONLY)) - return 0; - - s = LOG_LOCK(log); - 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; - } - LOG_UNLOCK(log, s); - 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; - SPLDECL(s); - xlog_t *log = mp->m_log; - - tail_lsn = xfs_trans_tail_ail(mp); - s = GRANT_LOCK(log); - if (tail_lsn != 0) { - log->l_tail_lsn = tail_lsn; - } else { - tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; - } - GRANT_UNLOCK(log, s); - - 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. - */ -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; - - /* - * 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, XFS_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; - } - xlog_state_done_syncing(iclog, aborted); - if (!(XFS_BUF_ISASYNC(bp))) { - /* - * Corresponding psema() will be done in bwrite(). If we don't - * vsema() here, panic. - */ - XFS_BUF_V_IODONESEMA(bp); - } else - XFS_BUF_VSEMA(bp); -} /* 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. - * - * Low memory machines only get 2 16KB buffers. We don't want to waste - * memory here. However, all other machines get at least 2 32KB buffers. - * The number is hard coded because we don't care about the minimum - * memory size, just 32MB systems. - * - * 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) { - if (xfs_physmem <= btoc(128*1024*1024)) { - log->l_iclog_bufs = XLOG_MIN_ICLOGS; - } else if (xfs_physmem <= btoc(400*1024*1024)) { - log->l_iclog_bufs = XLOG_MED_ICLOGS; - } else { /* 256K with 32K bufs */ - 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; - } - - /* - * Special case machines that have less than 32MB of memory. - * All machines with more memory use 32KB buffers. - */ - if (xfs_physmem <= btoc(32*1024*1024)) { - /* Don't change; min configuration */ - log->l_iclog_size = XLOG_RECORD_BSIZE; /* 16k */ - log->l_iclog_size_log = XLOG_RECORD_BSHIFT; - } else { - log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; /* 32k */ - 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; - ASSIGN_ANY_LSN_HOST(log->l_tail_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); - XFS_BUF_VSEMA(bp); - log->l_xbuf = bp; - - spinlock_init(&log->l_icloglock, "iclog"); - spinlock_init(&log->l_grant_lock, "grhead_iclog"); - 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->hic_data = (xlog_in_core_2_t *) - kmem_zalloc(iclogsize, KM_SLEEP); - - iclog->ic_prev = prev_iclog; - prev_iclog = iclog; - log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); - - head = &iclog->ic_header; - memset(head, 0, sizeof(xlog_rec_header_t)); - INT_SET(head->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM); - INT_SET(head->h_version, ARCH_CONVERT, - XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1); - INT_SET(head->h_size, ARCH_CONVERT, log->l_iclog_size); - /* new fields */ - INT_SET(head->h_fmt, ARCH_CONVERT, XLOG_FMT); - memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); - - 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); - iclog->ic_bp = bp; - - 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); - XFS_BUF_VSEMA(iclog->ic_bp); - 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, XFS_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. - */ -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; - SPLDECL(s); - - ASSERT(BTOBB(need_bytes) < log->l_logBBsize); - - s = GRANT_LOCK(log); - 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; - } - ASSIGN_ANY_LSN_HOST(threshold_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; - } - GRANT_UNLOCK(log, s); - - /* - * 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(). - */ - -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, ops; - 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; - SPLDECL(s); - 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 */ - s = GRANT_LOCK(log); - xlog_grant_add_space(log, roundoff); - GRANT_UNLOCK(log, s); - - /* put cycle number in every block */ - xlog_pack_data(log, iclog, roundoff); - - /* real byte length */ - if (v2) { - INT_SET(iclog->ic_header.h_len, - ARCH_CONVERT, - iclog->ic_offset + roundoff); - } else { - INT_SET(iclog->ic_header.h_len, ARCH_CONVERT, iclog->ic_offset); - } - - /* put ops count in correct order */ - ops = iclog->ic_header.h_num_logops; - INT_SET(iclog->ic_header.h_num_logops, ARCH_CONVERT, ops); - - bp = iclog->ic_bp; - XFS_BUF_PSEMA(bp, PRIBIO); - 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(INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT))); - - 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_PTR(bp, (xfs_caddr_t) &(iclog->ic_header), count); - XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ - XFS_BUF_BUSY(bp); - XFS_BUF_ASYNC(bp); - XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); - /* - * Do an ordered write for the log block. - * - * It may not be needed to flush the first split block in the log wrap - * case, but do it anyways to be safe -AK - */ - if (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_BUSY(bp); - XFS_BUF_ASYNC(bp); - XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); - 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) { - INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); - if (INT_GET(*(uint *)dptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) - INT_MOD(*(uint *)dptr, ARCH_CONVERT, +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 - */ -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_PSEMA(iclog->ic_bp, PRIBIO); - 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->hic_data, log->l_iclog_size); - 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, NBPP); - tic = next_tic; - } - } - XFS_BUF_PSEMA(log->l_xbuf, PRIBIO); - 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) -{ - SPLDECL(s); - - s = LOG_LOCK(log); - - iclog->ic_header.h_num_logops += record_cnt; - iclog->ic_offset += copy_bytes; - - LOG_UNLOCK(log, s); -} /* 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. - */ -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_op_header_t *logop_head; /* ptr to log operation header */ - xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */ - __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 = 0; /* 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); - XLOG_TIC_ADD_OPHDR(ticket); - } - - for (index = 0; index < nentries; index++) { - len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ - XLOG_TIC_ADD_OPHDR(ticket); - 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, XFS_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 = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); - - /* 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; - INT_SET(logop_head->oh_tid, ARCH_CONVERT, 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; - INT_SET(logop_head->oh_tid, ARCH_CONVERT, 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 */ - INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len = need_copy); - 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; - INT_SET(logop_head->oh_len, ARCH_CONVERT, 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); - XLOG_TIC_ADD_OPHDR(ticket); - } - 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 && - (INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT) == 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 = INT_GET(lsn_log->ic_header.h_lsn, ARCH_CONVERT); - 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 */ - SPLDECL(s); - - s = LOG_LOCK(log); - 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 LOG_LOCK. - */ - 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, - INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) - )<0)) { - iclog = iclog->ic_next; - continue; /* Leave this iclog for - * another thread */ - } - - iclog->ic_state = XLOG_STATE_CALLBACK; - - LOG_UNLOCK(log, s); - - /* l_last_sync_lsn field protected by - * GRANT_LOCK. Don't worry about iclog's lsn. - * No one else can be here except us. - */ - s = GRANT_LOCK(log); - ASSERT(XFS_LSN_CMP( - log->l_last_sync_lsn, - INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) - )<=0); - log->l_last_sync_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); - GRANT_UNLOCK(log, s); - - /* - * 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. - */ - s = LOG_LOCK(log); - } else { - ioerrors++; - } - cb = iclog->ic_callback; - - while (cb != 0) { - iclog->ic_callback_tail = &(iclog->ic_callback); - iclog->ic_callback = NULL; - LOG_UNLOCK(log, s); - - /* perform callbacks in the order given */ - for (; cb != 0; cb = cb_next) { - cb_next = cb->cb_next; - cb->cb_func(cb->cb_arg, aborted); - } - s = LOG_LOCK(log); - cb = iclog->ic_callback; - } - - loopdidcallbacks++; - funcdidcallbacks++; - - ASSERT(iclog->ic_callback == 0); - 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 && (repeats % 10) == 0) { - xfs_fs_cmn_err(CE_WARN, log->l_mp, - "xlog_state_do_callback: looping %d", repeats); - } - } 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 - * LOG_LOCK - * IOERROR - give up hope all ye who enter here - */ - if (iclog->ic_state == XLOG_STATE_WANT_SYNC || - iclog->ic_state == XLOG_STATE_SYNCING || - iclog->ic_state == XLOG_STATE_DONE_SYNC || - iclog->ic_state == XLOG_STATE_IOERROR ) - break; - iclog = iclog->ic_next; - } while (first_iclog != iclog); - } -#endif - - if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) { - flushcnt = log->l_flushcnt; - log->l_flushcnt = 0; - } - LOG_UNLOCK(log, s); - 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. - */ -void -xlog_state_done_syncing( - xlog_in_core_t *iclog, - int aborted) -{ - xlog_t *log = iclog->ic_log; - SPLDECL(s); - - s = LOG_LOCK(log); - - 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) { - LOG_UNLOCK(log, s); - 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); - LOG_UNLOCK(log, s); - 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. - */ -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) -{ - SPLDECL(s); - int log_offset; - xlog_rec_header_t *head; - xlog_in_core_t *iclog; - int error; - -restart: - s = LOG_LOCK(log); - if (XLOG_FORCED_SHUTDOWN(log)) { - LOG_UNLOCK(log, s); - return XFS_ERROR(EIO); - } - - iclog = log->l_iclog; - if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) { - log->l_flushcnt++; - LOG_UNLOCK(log, s); - 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); - INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle); - ASSIGN_LSN(head->h_lsn, log); - 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) { - LOG_UNLOCK(log, s); - if ((error = xlog_state_release_iclog(log, iclog))) - return error; - } else { - iclog->ic_refcnt--; - LOG_UNLOCK(log, s); - } - 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); - LOG_UNLOCK(log, s); - - *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; - SPLDECL(s); -#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? */ - s = GRANT_LOCK(log); - 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"); - s = GRANT_LOCK(log); - } - 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)) { - s = GRANT_LOCK(log); - goto error_return; - } - - xlog_trace_loggrant(log, tic, - "xlog_grant_log_space: wake 2"); - xlog_grant_push_ail(log->l_mp, need_bytes); - s = GRANT_LOCK(log); - 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); - GRANT_UNLOCK(log, s); - 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. */ - GRANT_UNLOCK(log, s); - 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) -{ - SPLDECL(s); - 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 - - s = GRANT_LOCK(log); - 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)) { - s = GRANT_LOCK(log); - 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); - s = GRANT_LOCK(log); - } - } - - 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)) { - s = GRANT_LOCK(log); - goto error_return; - } - - xlog_trace_loggrant(log, tic, - "xlog_regrant_write_log_space: wake 2"); - xlog_grant_push_ail(log->l_mp, need_bytes); - s = GRANT_LOCK(log); - 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); - GRANT_UNLOCK(log, s); - 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. */ - GRANT_UNLOCK(log, s); - 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) -{ - SPLDECL(s); - - xlog_trace_loggrant(log, ticket, - "xlog_regrant_reserve_log_space: enter"); - if (ticket->t_cnt > 0) - ticket->t_cnt--; - - s = GRANT_LOCK(log); - 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) { - GRANT_UNLOCK(log, s); - 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); - GRANT_UNLOCK(log, s); - 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) -{ - SPLDECL(s); - - if (ticket->t_cnt > 0) - ticket->t_cnt--; - - s = GRANT_LOCK(log); - 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); - GRANT_UNLOCK(log, s); - xfs_log_move_tail(log->l_mp, 1); -} /* xlog_ungrant_log_space */ - - -/* - * Atomically put back used ticket. - */ -void -xlog_state_put_ticket(xlog_t *log, - xlog_ticket_t *tic) -{ - unsigned long s; - - s = LOG_LOCK(log); - xlog_ticket_put(log, tic); - LOG_UNLOCK(log, s); -} /* 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. - * - * - */ -int -xlog_state_release_iclog(xlog_t *log, - xlog_in_core_t *iclog) -{ - SPLDECL(s); - int sync = 0; /* do we sync? */ - - xlog_assign_tail_lsn(log->l_mp); - - s = LOG_LOCK(log); - - if (iclog->ic_state & XLOG_STATE_IOERROR) { - LOG_UNLOCK(log, s); - 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; - INT_SET(iclog->ic_header.h_tail_lsn, ARCH_CONVERT, log->l_tail_lsn); - xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); - /* cycle incremented when incrementing curr_block */ - } - - LOG_UNLOCK(log, s); - - /* - * 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; - INT_SET(iclog->ic_header.h_prev_block, ARCH_CONVERT, 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; - SPLDECL(s); - - s = LOG_LOCK(log); - - iclog = log->l_iclog; - if (iclog->ic_state & XLOG_STATE_IOERROR) { - LOG_UNLOCK(log, s); - 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 = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); - xlog_state_switch_iclogs(log, iclog, 0); - LOG_UNLOCK(log, s); - - if (xlog_state_release_iclog(log, iclog)) - return XFS_ERROR(EIO); - *log_flushed = 1; - s = LOG_LOCK(log); - if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) == 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 LOG_LOCK. - * Then we check again after waking up, in case our - * sleep was disturbed by a bad news. - */ - if (iclog->ic_state & XLOG_STATE_IOERROR) { - LOG_UNLOCK(log, s); - 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: - LOG_UNLOCK(log, s); - } - 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(). - */ -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; - SPLDECL(s); - - -try_again: - s = LOG_LOCK(log); - iclog = log->l_iclog; - - if (iclog->ic_state & XLOG_STATE_IOERROR) { - LOG_UNLOCK(log, s); - return XFS_ERROR(EIO); - } - - do { - if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) != lsn) { - iclog = iclog->ic_next; - continue; - } - - if (iclog->ic_state == XLOG_STATE_DIRTY) { - LOG_UNLOCK(log, s); - 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); - LOG_UNLOCK(log, s); - if (xlog_state_release_iclog(log, iclog)) - return XFS_ERROR(EIO); - *log_flushed = 1; - s = LOG_LOCK(log); - } - } - - 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) { - LOG_UNLOCK(log, s); - 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 */ - LOG_UNLOCK(log, s); - } - return 0; - - } while (iclog != log->l_iclog); - - LOG_UNLOCK(log, s); - return 0; -} /* xlog_state_sync */ - - -/* - * Called when we want to mark the current iclog as being ready to sync to - * disk. - */ -void -xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) -{ - SPLDECL(s); - - s = LOG_LOCK(log); - - 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)); - } - - LOG_UNLOCK(log, s); -} /* 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 = (NBPP / sizeof(xlog_ticket_t)) - 2; - SPLDECL(s); - - /* - * 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(NBPP, KM_SLEEP); - - s = LOG_LOCK(log); - - /* 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; - LOG_UNLOCK(log, s); -} /* 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 != 0) { - log->l_tail->t_next = ticket; - } else { - ASSERT(log->l_freelist == 0); - 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 - */ -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; - SPLDECL(s); - - alloc: - if (log->l_freelist == NULL) - xlog_state_ticket_alloc(log); /* potentially sleep */ - - s = LOG_LOCK(log); - if (log->l_freelist == NULL) { - LOG_UNLOCK(log, s); - 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--; - LOG_UNLOCK(log, s); - - /* - * 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; - SPLDECL(s); - - /* check validity of iclog pointers */ - s = LOG_LOCK(log); - icptr = log->l_iclog; - for (i=0; i < log->l_iclog_bufs; i++) { - if (icptr == 0) - xlog_panic("xlog_verify_iclog: invalid ptr"); - icptr = icptr->ic_next; - } - if (icptr != log->l_iclog) - xlog_panic("xlog_verify_iclog: corrupt iclog ring"); - LOG_UNLOCK(log, s); - - /* check log magic numbers */ - ptr = (xfs_caddr_t) &(iclog->ic_header); - if (INT_GET(*(uint *)ptr, ARCH_CONVERT) != XLOG_HEADER_MAGIC_NUM) - xlog_panic("xlog_verify_iclog: invalid magic num"); - - for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&(iclog->ic_header))+count; - ptr += BBSIZE) { - if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) - xlog_panic("xlog_verify_iclog: unexpected magic num"); - } - - /* check fields */ - len = INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT); - 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 = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); - } else { - clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); - } - } - 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 = INT_GET(ophead->oh_len, ARCH_CONVERT); - } 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 = INT_GET(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); - } else { - op_len = INT_GET(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); - } - } - ptr += sizeof(xlog_op_header_t) + op_len; - } -} /* xlog_verify_iclog */ -#endif - -/* - * Mark all iclogs IOERROR. LOG_LOCK 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; - SPLDECL(s); - SPLDECL(s2); - - 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. - */ - s = GRANT_LOCK(log); - s2 = LOG_LOCK(log); - 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); - LOG_UNLOCK(log, s2); - - /* - * 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); - } - GRANT_UNLOCK(log, s); - - 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); - s2 = LOG_LOCK(log); - retval = xlog_state_ioerror(log); - LOG_UNLOCK(log, s2); - } - /* - * 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; - - s = LOG_LOCK(log); - iclog = log->l_iclog; - do { - ASSERT(iclog->ic_callback == 0); - iclog = iclog->ic_next; - } while (iclog != log->l_iclog); - LOG_UNLOCK(log, s); - } -#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; -} - |
