patch-2.4.25 linux-2.4.25/fs/xfs/xfs_log.c
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- Lines: 3613
- Date:
2004-02-18 05:36:32.000000000 -0800
- Orig file:
linux-2.4.24/fs/xfs/xfs_log.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.24/fs/xfs/xfs_log.c linux-2.4.25/fs/xfs/xfs_log.c
@@ -0,0 +1,3612 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 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.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+/*
+ * High level interface routines for log manager
+ */
+
+#include "xfs.h"
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_ag.h"
+#include "xfs_sb.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_dir.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_alloc_btree.h"
+#include "xfs_log_recover.h"
+#include "xfs_bit.h"
+#include "xfs_rw.h"
+#include "xfs_trans_priv.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_unalloc_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);
+STATIC int xlog_state_sync_all(xlog_t *log, uint flags);
+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);
+
+/* local debug functions */
+#if defined(DEBUG) && !defined(XLOG_NOLOG)
+STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr);
+#ifdef XFSDEBUG
+STATIC void xlog_verify_disk_cycle_no(xlog_t *log, xlog_in_core_t *iclog);
+#endif
+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_disk_cycle_no(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
+
+int xlog_iclogs_empty(xlog_t *log);
+
+#ifdef DEBUG
+int xlog_do_error = 0;
+int xlog_req_num = 0;
+int xlog_error_mod = 33;
+#endif
+
+#define XLOG_FORCED_SHUTDOWN(log) (log->l_flags & XLOG_IO_ERROR)
+
+/*
+ * 0 => disable log manager
+ * 1 => enable log manager
+ * 2 => enable log manager and log debugging
+ */
+#if defined(XLOG_NOLOG) || defined(DEBUG)
+int xlog_debug = 1;
+xfs_buftarg_t *xlog_target;
+#endif
+
+#if defined(XFS_LOG_TRACE)
+
+void
+xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string)
+{
+ if (! log->l_grant_trace) {
+ log->l_grant_trace = ktrace_alloc(1024, KM_NOSLEEP);
+ if (! log->l_grant_trace)
+ return;
+ }
+
+ 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, ARCH_NOCONVERT)),
+ (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn, ARCH_NOCONVERT)),
+ (void *)string,
+ (void *)((unsigned long)13),
+ (void *)((unsigned long)14),
+ (void *)((unsigned long)15),
+ (void *)((unsigned long)16));
+}
+
+void
+xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
+{
+ pid_t pid;
+
+ pid = current_pid();
+
+ if (!iclog->ic_trace)
+ iclog->ic_trace = ktrace_alloc(256, KM_SLEEP);
+ ktrace_enter(iclog->ic_trace,
+ (void *)((unsigned long)state),
+ (void *)((unsigned long)pid),
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0,
+ (void *)0);
+}
+
+#else
+#define xlog_trace_loggrant(log,tic,string)
+#define xlog_trace_iclog(iclog,state)
+#endif /* XFS_LOG_TRACE */
+
+/*
+ * 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 defined(DEBUG) || defined(XLOG_NOLOG)
+ if (!xlog_debug && xlog_target == log->l_targ)
+ return 0;
+#endif
+
+ 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 specifc
+ * request has been made to release a permanent reservation.
+ */
+ xlog_ungrant_log_space(log, ticket);
+ xlog_state_put_ticket(log, ticket);
+ } else {
+ 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 rval;
+ xlog_t *log = mp->m_log;
+
+#if defined(DEBUG) || defined(XLOG_NOLOG)
+ if (!xlog_debug && xlog_target == log->l_targ)
+ return 0;
+#endif
+
+ ASSERT(flags & XFS_LOG_FORCE);
+
+ XFS_STATS_INC(xs_log_force);
+
+ if ((log->l_flags & XLOG_IO_ERROR) == 0) {
+ if (lsn == 0)
+ rval = xlog_state_sync_all(log, flags);
+ else
+ rval = xlog_state_sync(log, lsn, flags);
+ } else {
+ rval = XFS_ERROR(EIO);
+ }
+
+ return rval;
+
+} /* xfs_log_force */
+
+
+/*
+ * This function will take a log sequence number and check to see if that
+ * lsn has been flushed to disk. If it has, then the callback function is
+ * called with the callback argument. If the relevant in-core log has not
+ * been synced to disk, we add the callback to the callback list of the
+ * in-core log.
+ */
+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;
+
+#if defined(DEBUG) || defined(XLOG_NOLOG)
+ if (!xlog_debug && xlog_target == log->l_targ)
+ return 0;
+#endif
+ cb->cb_next = 0;
+ 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 = 0;
+ *(iclog->ic_callback_tail) = cb;
+ iclog->ic_callback_tail = &(cb->cb_next);
+ }
+ LOG_UNLOCK(log, spl);
+ if (abortflg) {
+ cb->cb_func(cb->cb_arg, abortflg);
+ }
+ return 0;
+} /* 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)
+{
+ xlog_t *log = mp->m_log;
+ xlog_ticket_t *internal_ticket;
+ int retval;
+
+#if defined(DEBUG) || defined(XLOG_NOLOG)
+ if (!xlog_debug && xlog_target == log->l_targ)
+ return 0;
+#endif
+ 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_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);
+ *ticket = internal_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);
+
+#if defined(DEBUG) || defined(XLOG_NOLOG)
+ if (!xlog_debug) {
+ cmn_err(CE_NOTE, "log dev: %s", XFS_BUFTARG_NAME(log_target));
+ return 0;
+ }
+#endif
+ /*
+ * skip log recovery on a norecovery mount. pretend it all
+ * just worked.
+ */
+ if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) {
+ int error;
+ 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, readonly);
+
+ if (readonly)
+ vfsp->vfs_flag |= VFS_RDONLY;
+ if (error) {
+ cmn_err(CE_WARN, "XFS: log mount/recovery failed");
+ xlog_unalloc_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 = 0;
+ 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 };
+
+#if defined(DEBUG) || defined(XLOG_NOLOG)
+ if (!xlog_debug && xlog_target == log->l_targ)
+ return 0;
+#endif
+
+ /*
+ * 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);
+
+ error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 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/O's 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_unalloc_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 defined(DEBUG) || defined(XLOG_NOLOG)
+ if (!xlog_debug && xlog_target == log->l_targ) {
+ *start_lsn = 0;
+ return 0;
+ }
+#endif
+ 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 defined(DEBUG) || defined(XLOG_NOLOG)
+ if (!xlog_debug && xlog_target == log->l_targ)
+ return;
+#endif
+ /* XXXsup tmp */
+ 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;
+ vfs_t *vfsp = XFS_MTOVFS(mp);
+
+ if (mp->m_frozen || 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, ARCH_NOCONVERT));
+ tail_cycle = CYCLE_LSN(log->l_tail_lsn, ARCH_NOCONVERT);
+ 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.
+ * This can only happen when the AIL is empty so the tail
+ * is equal to the head and the l_roundoff value in the
+ * log structure is taking up the difference between the
+ * reservation head and the tail. The bytes accounted for
+ * by the l_roundoff field are temporarily 'lost' to the
+ * reservation mechanism, but they are cleaned up when the
+ * log buffers that created them are reused. These lost
+ * bytes are what allow the reservation head to fall behind
+ * the tail in the case that the log is 'empty'.
+ * In this case we just want to return the size of the
+ * log as the amount of space left.
+ */
+/* This assert does not take into account padding from striped log writes *
+ ASSERT((tail_cycle == (cycle + 1)) ||
+ ((bytes + log->l_roundoff) >= tail_bytes));
+*/
+ 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;
+ 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;
+
+ /*
+ * Race to shutdown the filesystem if we see an error.
+ */
+ if (XFS_BUF_GETERROR(bp)) {
+ /* 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 for broken cpp
+ */
+ struct log *l;
+ xfs_ioerror_alert("xlog_iodone",
+ iclog->ic_log->l_mp, bp, XFS_BUF_ADDR(bp));
+ XFS_BUF_STALE(bp);
+ l = iclog->ic_log;
+ 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);
+ }
+} /* 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 defined(DEBUG) || defined(XLOG_NOLOG)
+ /*
+ * When logbufs == 0, someone has disabled the log from the FSTAB
+ * file. This is not a documented feature. We need to set xlog_debug
+ * to zero (this deactivates the log) and set xlog_target to the
+ * appropriate device. Only one filesystem may be affected as such
+ * since this is just a performance hack to test what we might be able
+ * to get if the log were not present.
+ */
+ if (mp->m_logbufs == 0) {
+ xlog_debug = 0;
+ xlog_target = log->l_targ;
+ log->l_iclog_bufs = XLOG_MIN_ICLOGS;
+ } else
+#endif
+ {
+ /*
+ * This is the normal path. If m_logbufs == -1, then the
+ * admin has chosen to use the system defaults for logbuffers.
+ */
+ if (mp->m_logbufs == -1) {
+ 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;
+
+#if defined(DEBUG) || defined(XLOG_NOLOG)
+ /* We are reactivating a filesystem after it was inactive */
+ if (log->l_targ == xlog_target) {
+ xlog_target = NULL;
+ xlog_debug = 1;
+ }
+#endif
+ }
+
+ /*
+ * Buffer size passed in from mount system call.
+ */
+ if (mp->m_logbsize != -1) {
+ 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;
+ }
+ return;
+ }
+
+ /*
+ * 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 == -1) {
+ 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;
+ }
+ }
+ }
+} /* 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(log->l_tail_lsn, 1, 0, ARCH_NOCONVERT);
+ /* 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_HASLOGV2(&mp->m_sb)) {
+ if (mp->m_sb.sb_logsunit <= 1) {
+ log->l_stripemask = 1;
+ } else {
+ log->l_stripemask = 1 <<
+ xfs_highbit32(mp->m_sb.sb_logsunit >> BBSHIFT);
+ }
+ }
+ if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) {
+ log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT;
+ ASSERT(log->l_sectbb_log <= mp->m_sectbb_log);
+ /* for larger sector sizes, must have v2 or external log */
+ ASSERT(log->l_sectbb_log == 0 ||
+ log->l_logBBstart == 0 ||
+ XFS_SB_VERSION_HASLOGV2(&mp->m_sb));
+ ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT);
+ }
+ log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1;
+
+ xlog_get_iclog_buffer_size(mp, log);
+
+ bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp);
+ XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone);
+ XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb);
+ XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
+ ASSERT(XFS_BUF_ISBUSY(bp));
+ ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
+ log->l_xbuf = bp;
+
+ 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_alloc(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);
+ 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 = 0;
+ reg[0].i_len = 0;
+
+ 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, ARCH_NOCONVERT) + free_threshold;
+ threshold_cycle = CYCLE_LSN(tail_lsn, ARCH_NOCONVERT);
+ if (threshold_block >= log->l_logBBsize) {
+ threshold_block -= log->l_logBBsize;
+ threshold_cycle += 1;
+ }
+ ASSIGN_ANY_LSN(threshold_lsn, threshold_cycle,
+ threshold_block, ARCH_NOCONVERT);
+
+ /* Don't pass in an lsn greater than the lsn of the last
+ * log record known to be on disk.
+ */
+ if (XFS_LSN_CMP_ARCH(threshold_lsn, log->l_last_sync_lsn, ARCH_NOCONVERT) > 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 a synchronous or
+ * 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 roundup;
+ uint count; /* byte count of bwrite */
+ int split = 0; /* split write into two regions */
+ int error;
+
+ XFS_STATS_INC(xs_log_writes);
+ ASSERT(iclog->ic_refcnt == 0);
+
+ /* Round out the log write size */
+ if (iclog->ic_offset & BBMASK) {
+ /* count of 0 is already accounted for up in
+ * xlog_state_sync_all(). Once in this routine,
+ * operations on the iclog are single threaded.
+ *
+ * Difference between rounded up size and size
+ */
+ count = iclog->ic_offset & BBMASK;
+ iclog->ic_roundoff += BBSIZE - count;
+ }
+ if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb)) {
+ unsigned sunit = BTOBB(log->l_mp->m_sb.sb_logsunit);
+ if (!sunit)
+ sunit = 1;
+
+ count = BTOBB(log->l_iclog_hsize + iclog->ic_offset);
+ if (count & (sunit - 1)) {
+ roundup = sunit - (count & (sunit - 1));
+ } else {
+ roundup = 0;
+ }
+ iclog->ic_offset += BBTOB(roundup);
+ }
+
+ log->l_roundoff += iclog->ic_roundoff;
+
+ xlog_pack_data(log, iclog); /* put cycle number in every block */
+
+ /* real byte length */
+ 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;
+ 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(iclog->ic_header.h_lsn, ARCH_CONVERT));
+
+ /* Count is already rounded up to a BBSIZE above */
+ count = iclog->ic_offset + iclog->ic_roundoff;
+ ASSERT((count & BBMASK) == 0);
+
+ /* Add for LR header */
+ count += log->l_iclog_hsize;
+ 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);
+ /*
+ * Do a disk write cache flush for the log block.
+ * This is a bit of a sledgehammer, it would be better
+ * to use a tag barrier here that just prevents reordering.
+ * 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_NOLOGFLUSH))
+ XFS_BUF_FLUSH(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);
+ if (!(log->l_mp->m_flags & XFS_MOUNT_NOLOGFLUSH))
+ XFS_BUF_FLUSH(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 does'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 */
+
+
+/*
+ * Unallocate a log structure
+ */
+void
+xlog_unalloc_log(xlog_t *log)
+{
+ xlog_in_core_t *iclog, *next_iclog;
+ xlog_ticket_t *tic, *next_tic;
+ int i;
+
+
+ iclog = log->l_iclog;
+ for (i=0; i<log->l_iclog_bufs; i++) {
+ sv_destroy(&iclog->ic_forcesema);
+ sv_destroy(&iclog->ic_writesema);
+ xfs_buf_free(iclog->ic_bp);
+#ifdef XFS_LOG_TRACE
+ if (iclog->ic_trace != NULL) {
+ ktrace_free(iclog->ic_trace);
+ }
+#endif
+ next_iclog = iclog->ic_next;
+ kmem_free(iclog->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_unalloc_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_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_unalloc_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 */
+
+
+
+
+/*
+ * 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; /* 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; /* 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 firstwr = 0; /* first write of transaction */
+ 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);
+
+ for (index = 0; index < nentries; index++) {
+ len += sizeof(xlog_op_header_t); /* each region gets >= 1 */
+ len += reg[index].i_len;
+ }
+ contwr = *start_lsn = 0;
+
+ if (ticket->t_curr_res < len) {
+#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;
+ INT_ZERO(logop_head->oh_len, ARCH_CONVERT);
+ logop_head->oh_flags = XLOG_START_TRANS;
+ INT_ZERO(logop_head->oh_res2, ARCH_CONVERT);
+ ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */
+ firstwr = 1; /* increment log ops below */
+ 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;
+ INT_ZERO(logop_head->oh_res2, ARCH_CONVERT);
+
+ /* 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_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;
+ firstwr = 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
+ */
+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 = 0; /* 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;
+ }
+ INT_ZERO(iclog->ic_header.h_num_logops, ARCH_CONVERT);
+ memset(iclog->ic_header.h_cycle_data, 0,
+ sizeof(iclog->ic_header.h_cycle_data));
+ INT_ZERO(iclog->ic_header.h_lsn, ARCH_CONVERT);
+ } 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_ARCH(lsn, lowest_lsn, ARCH_NOCONVERT) < 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_ARCH(
+ lowest_lsn,
+ INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT),
+ ARCH_NOCONVERT
+ )<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_ARCH(
+ log->l_last_sync_lsn,
+ INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT),
+ ARCH_NOCONVERT
+ )<=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 = 0;
+ 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;
+ INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle);
+ ASSIGN_LSN(head->h_lsn, log, ARCH_CONVERT);
+ ASSERT(log->l_curr_block >= 0);
+
+ /* round off error from last write with this iclog */
+ ticket->t_curr_res -= iclog->ic_roundoff;
+ log->l_roundoff -= iclog->ic_roundoff;
+ iclog->ic_roundoff = 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, 'w');
+ XLOG_GRANT_ADD_SPACE(log, need_bytes, 'r');
+#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, ARCH_NOCONVERT) != log->l_grant_write_cycle) {
+ ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn, ARCH_NOCONVERT));
+ ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn, ARCH_NOCONVERT)));
+ }
+#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;
+
+ 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);
+
+ XLOG_GRANT_ADD_SPACE(log, need_bytes, 'w'); /* we've got enough space */
+#ifdef DEBUG
+ tail_lsn = log->l_tail_lsn;
+ if (CYCLE_LSN(tail_lsn, ARCH_NOCONVERT) != log->l_grant_write_cycle) {
+ ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn, ARCH_NOCONVERT));
+ ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn, ARCH_NOCONVERT)));
+ }
+#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, 'w');
+ XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'r');
+ ticket->t_curr_res = ticket->t_unit_res;
+ 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(log, ticket->t_unit_res, 'r');
+ 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_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, 'w');
+ XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'r');
+
+ 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,'w');
+ XLOG_GRANT_SUB_SPACE(log, ticket->t_unit_res*ticket->t_cnt,'r');
+ }
+
+ 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 someother 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)
+{
+ uint roundup;
+
+ 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)) {
+ if (log->l_curr_block & (log->l_stripemask - 1)) {
+ roundup = log->l_stripemask -
+ (log->l_curr_block & (log->l_stripemask - 1));
+ } else {
+ roundup = 0;
+ }
+ log->l_curr_block += roundup;
+ }
+
+ 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)
+{
+ 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.
+ */
+ ASSERT(iclog->ic_roundoff == 0);
+ 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);
+ 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);
+
+ } 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)
+{
+ 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);
+ 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);
+ 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);
+ } 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 = 0;
+ 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 = 0;
+ 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;
+ 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 line of code adds one log record header length
+ * for each part of an operation which may fall on a different
+ * log record.
+ *
+ * One more XLOG_HEADER_SIZE is added to account for possible
+ * round off errors when syncing a LR to disk. The bytes are
+ * subtracted if the thread using this ticket is the first writer
+ * to a new LR.
+ *
+ * We add an extra log header for the possibility that the commit
+ * record is the first data written to a new log record. In this
+ * case it is separate from the rest of the transaction data and
+ * will be charged for the log record header.
+ */
+ unit_bytes += log->l_iclog_hsize * (XLOG_BTOLRBB(unit_bytes) + 2);
+
+ 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;
+ if (xflags & XFS_LOG_PERM_RESERV)
+ tic->t_flags |= XLOG_TIC_PERM_RESERV;
+ sv_init(&(tic->t_sema), SV_DEFAULT, "logtick");
+
+ return tic;
+} /* xlog_ticket_get */
+
+
+/******************************************************************************
+ *
+ * Log debug routines
+ *
+ ******************************************************************************
+ */
+#if defined(DEBUG) && !defined(XLOG_NOLOG)
+/*
+ * 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 */
+
+
+#ifdef XFSDEBUG
+/* check split LR write */
+STATIC void
+xlog_verify_disk_cycle_no(xlog_t *log,
+ xlog_in_core_t *iclog)
+{
+ xfs_buf_t *bp;
+ uint cycle_no;
+ xfs_caddr_t ptr;
+ xfs_daddr_t i;
+
+ if (BLOCK_LSN(iclog->ic_header.h_lsn, ARCH_CONVERT) < 10) {
+ cycle_no = CYCLE_LSN(iclog->ic_header.h_lsn, ARCH_CONVERT);
+ bp = xlog_get_bp(log, 1);
+ ASSERT(bp);
+ for (i = 0; i < BLOCK_LSN(iclog->ic_header.h_lsn, ARCH_CONVERT); i++) {
+ xlog_bread(log, i, 1, bp);
+ ptr = xlog_align(log, i, 1, bp);
+ if (GET_CYCLE(ptr, ARCH_CONVERT) != cycle_no)
+ xlog_warn("XFS: xlog_verify_disk_cycle_no: bad cycle no");
+ }
+ xlog_put_bp(bp);
+ }
+} /* xlog_verify_disk_cycle_no */
+#endif
+
+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, ARCH_NOCONVERT) == log->l_prev_cycle) {
+ blocks =
+ log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn, ARCH_NOCONVERT));
+ 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, ARCH_NOCONVERT)+1 == log->l_prev_cycle);
+
+ if (BLOCK_LSN(tail_lsn, ARCH_NOCONVERT) == log->l_prev_block)
+ xlog_panic("xlog_verify_tail_lsn: tail wrapped");
+
+ blocks = BLOCK_LSN(tail_lsn, ARCH_NOCONVERT) - 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%x", clientid, ophead, 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 /* DEBUG && !XLOG_NOLOG */
+
+/*
+ * 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;
+ 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);
+ 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);
+}
+
+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);
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)