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xfs_log.c
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xfs_log.c
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/*
* Copyright (c) 2000-2004 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);
STATIC void xlog_verify_grant_head(xlog_t *log, int equals);
STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog,
int count, boolean_t syncing);
STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog,
xfs_lsn_t tail_lsn);
#else
#define xlog_verify_dest_ptr(a,b)
#define xlog_verify_grant_head(a,b)
#define xlog_verify_iclog(a,b,c,d)
#define xlog_verify_tail_lsn(a,b,c)
#endif
STATIC int xlog_iclogs_empty(xlog_t *log);
#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)
{
unsigned long cnts;
if (!log->l_grant_trace) {
log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP);
if (!log->l_grant_trace)
return;
}
/* ticket counts are 1 byte each */
cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8;
ktrace_enter(log->l_grant_trace,
(void *)tic,
(void *)log->l_reserve_headq,
(void *)log->l_write_headq,
(void *)((unsigned long)log->l_grant_reserve_cycle),
(void *)((unsigned long)log->l_grant_reserve_bytes),
(void *)((unsigned long)log->l_grant_write_cycle),
(void *)((unsigned long)log->l_grant_write_bytes),
(void *)((unsigned long)log->l_curr_cycle),
(void *)((unsigned long)log->l_curr_block),
(void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)),
(void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)),
(void *)string,
(void *)((unsigned long)tic->t_trans_type),
(void *)cnts,
(void *)((unsigned long)tic->t_curr_res),
(void *)((unsigned long)tic->t_unit_res));
}
void
xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
{
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_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)");
xlog_ungrant_log_space(log, ticket);
xlog_state_put_ticket(log, ticket);
} else {
xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)");
xlog_regrant_reserve_log_space(log, ticket);
}
/* If this ticket was a permanent reservation and we aren't
* trying to release it, reset the inited flags; so next time
* we write, a start record will be written out.
*/
if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) &&
(flags & XFS_LOG_REL_PERM_RESERV) == 0)
ticket->t_flags |= XLOG_TIC_INITED;
return lsn;
} /* xfs_log_done */
/*
* Force the in-core log to disk. If flags == XFS_LOG_SYNC,
* the force is done synchronously.
*
* Asynchronous forces are implemented by setting the WANT_SYNC
* bit in the appropriate in-core log and then returning.
*
* Synchronous forces are implemented with a semaphore. All callers
* to force a given lsn to disk will wait on a semaphore attached to the
* specific in-core log. When given in-core log finally completes its
* write to disk, that thread will wake up all threads waiting on the
* semaphore.
*/
int
xfs_log_force(xfs_mount_t *mp,
xfs_lsn_t lsn,
uint flags)
{
int 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 */
/*
* Attaches a new iclog I/O completion callback routine during
* transaction commit. If the log is in error state, a non-zero
* return code is handed back and the caller is responsible for
* executing the callback at an appropriate time.
*/
int
xfs_log_notify(xfs_mount_t *mp, /* mount of partition */
void *iclog_hndl, /* iclog to hang callback off */
xfs_log_callback_t *cb)
{
xlog_t *log = mp->m_log;
xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl;
int abortflg, spl;
#if defined(DEBUG) || defined(XLOG_NOLOG)
if (!xlog_debug && xlog_target == log->l_targ)
return 0;
#endif
cb->cb_next = NULL;
spl = LOG_LOCK(log);
abortflg = (iclog->ic_state & XLOG_STATE_IOERROR);
if (!abortflg) {
ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) ||
(iclog->ic_state == XLOG_STATE_WANT_SYNC));
cb->cb_next = NULL;
*(iclog->ic_callback_tail) = cb;
iclog->ic_callback_tail = &(cb->cb_next);
}
LOG_UNLOCK(log, spl);
return abortflg;
} /* xfs_log_notify */
int
xfs_log_release_iclog(xfs_mount_t *mp,
void *iclog_hndl)
{
xlog_t *log = mp->m_log;
xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl;
if (xlog_state_release_iclog(log, iclog)) {
xfs_force_shutdown(mp, XFS_LOG_IO_ERROR);
return(EIO);
}
return 0;
}
/*
* 1. Reserve an amount of on-disk log space and return a ticket corresponding
* to the reservation.
* 2. Potentially, push buffers at tail of log to disk.
*
* Each reservation is going to reserve extra space for a log record header.
* When writes happen to the on-disk log, we don't subtract the length of the
* log record header from any reservation. By wasting space in each
* reservation, we prevent over allocation problems.
*/
int
xfs_log_reserve(xfs_mount_t *mp,
int unit_bytes,
int cnt,
xfs_log_ticket_t *ticket,
__uint8_t client,
uint flags,
uint t_type)
{
xlog_t *log = mp->m_log;
xlog_ticket_t *internal_ticket;
int retval;
#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_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)");
xlog_grant_push_ail(mp, internal_ticket->t_unit_res);
retval = xlog_regrant_write_log_space(log, internal_ticket);
} else {
/* may sleep if need to allocate more tickets */
internal_ticket = xlog_ticket_get(log, unit_bytes, cnt,
client, flags);
internal_ticket->t_trans_type = t_type;
*ticket = internal_ticket;
xlog_trace_loggrant(log, internal_ticket,
(internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ?
"xfs_log_reserve: create new ticket (permanent trans)" :
"xfs_log_reserve: create new ticket");
xlog_grant_push_ail(mp,
(internal_ticket->t_unit_res *
internal_ticket->t_cnt));
retval = xlog_grant_log_space(log, internal_ticket);
}
return retval;
} /* xfs_log_reserve */
/*
* Mount a log filesystem
*
* mp - ubiquitous xfs mount point structure
* log_target - buftarg of on-disk log device
* blk_offset - Start block # where block size is 512 bytes (BBSIZE)
* num_bblocks - Number of BBSIZE blocks in on-disk log
*
* Return error or zero.
*/
int
xfs_log_mount(xfs_mount_t *mp,
xfs_buftarg_t *log_target,
xfs_daddr_t blk_offset,
int num_bblks)
{
if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname);
else {
cmn_err(CE_NOTE,
"!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.",
mp->m_fsname);
ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY);
}
mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks);
#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: error %d", error);
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 = NULL;
xfs_lsn_t lsn;
int error;
SPLDECL(s);
/* the data section must be 32 bit size aligned */
struct {
__uint16_t magic;
__uint16_t pad1;
__uint32_t pad2; /* may as well make it 64 bits */
} magic = { XLOG_UNMOUNT_TYPE, 0, 0 };
#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);
XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_UNMOUNT);
error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0, 0);
if (!error) {
/* remove inited flag */
((xlog_ticket_t *)tic)->t_flags = 0;
error = xlog_write(mp, reg, 1, tic, &lsn,
NULL, XLOG_UNMOUNT_TRANS);
/*
* At this point, we're umounting anyway,
* so there's no point in transitioning log state
* to IOERROR. Just continue...
*/
}
if (error) {
xfs_fs_cmn_err(CE_ALERT, mp,
"xfs_log_unmount: unmount record failed");
}
s = LOG_LOCK(log);
iclog = log->l_iclog;
iclog->ic_refcnt++;
LOG_UNLOCK(log, s);
xlog_state_want_sync(log, iclog);
(void) xlog_state_release_iclog(log, iclog);
s = LOG_LOCK(log);
if (!(iclog->ic_state == XLOG_STATE_ACTIVE ||
iclog->ic_state == XLOG_STATE_DIRTY)) {
if (!XLOG_FORCED_SHUTDOWN(log)) {
sv_wait(&iclog->ic_forcesema, PMEM,
&log->l_icloglock, s);
} else {
LOG_UNLOCK(log, s);
}
} else {
LOG_UNLOCK(log, s);
}
if (tic)
xlog_state_put_ticket(log, tic);
} else {
/*
* We're already in forced_shutdown mode, couldn't
* even attempt to write out the unmount transaction.
*
* Go through the motions of sync'ing and releasing
* the iclog, even though no I/O will actually happen,
* we need to wait for other log I/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 (fs_frozen(vfsp) || XFS_FORCED_SHUTDOWN(mp) ||
(vfsp->vfs_flag & VFS_RDONLY))
return 0;
s = LOG_LOCK(log);
if (((log->l_covered_state == XLOG_STATE_COVER_NEED) ||
(log->l_covered_state == XLOG_STATE_COVER_NEED2))
&& !xfs_trans_first_ail(mp, &gen)
&& xlog_iclogs_empty(log)) {
if (log->l_covered_state == XLOG_STATE_COVER_NEED)
log->l_covered_state = XLOG_STATE_COVER_DONE;
else {
ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2);
log->l_covered_state = XLOG_STATE_COVER_DONE2;
}
needed = 1;
}
LOG_UNLOCK(log, s);
return(needed);
}
/******************************************************************************
*
* local routines
*
******************************************************************************
*/
/* xfs_trans_tail_ail returns 0 when there is nothing in the list.
* The log manager must keep track of the last LR which was committed
* to disk. The lsn of this LR will become the new tail_lsn whenever
* xfs_trans_tail_ail returns 0. If we don't do this, we run into
* the situation where stuff could be written into the log but nothing
* was ever in the AIL when asked. Eventually, we panic since the
* tail hits the head.
*
* We may be holding the log iclog lock upon entering this routine.
*/
xfs_lsn_t
xlog_assign_tail_lsn(xfs_mount_t *mp)
{
xfs_lsn_t tail_lsn;
SPLDECL(s);
xlog_t *log = mp->m_log;
tail_lsn = xfs_trans_tail_ail(mp);
s = GRANT_LOCK(log);
if (tail_lsn != 0) {
log->l_tail_lsn = tail_lsn;
} else {
tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn;
}
GRANT_UNLOCK(log, s);
return tail_lsn;
} /* xlog_assign_tail_lsn */
/*
* Return the space in the log between the tail and the head. The head
* is passed in the cycle/bytes formal parms. In the special case where
* the reserve head has wrapped passed the tail, this calculation is no
* longer valid. In this case, just return 0 which means there is no space
* in the log. This works for all places where this function is called
* with the reserve head. Of course, if the write head were to ever
* wrap the tail, we should blow up. Rather than catch this case here,
* we depend on other ASSERTions in other parts of the code. XXXmiken
*
* This code also handles the case where the reservation head is behind
* the tail. The details of this case are described below, but the end
* result is that we return the size of the log as the amount of space left.
*/
int
xlog_space_left(xlog_t *log, int cycle, int bytes)
{
int free_bytes;
int tail_bytes;
int tail_cycle;
tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn));
tail_cycle = CYCLE_LSN(log->l_tail_lsn);
if ((tail_cycle == cycle) && (bytes >= tail_bytes)) {
free_bytes = log->l_logsize - (bytes - tail_bytes);
} else if ((tail_cycle + 1) < cycle) {
return 0;
} else if (tail_cycle < cycle) {
ASSERT(tail_cycle == (cycle - 1));
free_bytes = tail_bytes - bytes;
} else {
/*
* The reservation head is behind the tail.
* In this case we just want to return the size of the
* log as the amount of space left.
*/
xfs_fs_cmn_err(CE_ALERT, log->l_mp,
"xlog_space_left: head behind tail\n"
" tail_cycle = %d, tail_bytes = %d\n"
" GH cycle = %d, GH bytes = %d",
tail_cycle, tail_bytes, cycle, bytes);
ASSERT(0);
free_bytes = log->l_logsize;
}
return free_bytes;
} /* xlog_space_left */
/*
* Log function which is called when an io completes.
*
* The log manager needs its own routine, in order to control what
* happens with the buffer after the write completes.
*/
void
xlog_iodone(xfs_buf_t *bp)
{
xlog_in_core_t *iclog;
xlog_t *l;
int aborted;
iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *);
ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2);
XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
aborted = 0;
/*
* Some versions of cpp barf on the recursive definition of
* ic_log -> hic_fields.ic_log and expand ic_log twice when
* it is passed through two macros. Workaround broken cpp.
*/
l = iclog->ic_log;
/*
* Race to shutdown the filesystem if we see an error.
*/
if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp,
XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) {
xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp));
XFS_BUF_STALE(bp);
xfs_force_shutdown(l->l_mp, XFS_LOG_IO_ERROR);
/*
* This flag will be propagated to the trans-committed
* callback routines to let them know that the log-commit
* didn't succeed.
*/
aborted = XFS_LI_ABORTED;
} else if (iclog->ic_state & XLOG_STATE_IOERROR) {
aborted = XFS_LI_ABORTED;
}
xlog_state_done_syncing(iclog, aborted);
if (!(XFS_BUF_ISASYNC(bp))) {
/*
* Corresponding psema() will be done in bwrite(). If we don't
* vsema() here, panic.
*/
XFS_BUF_V_IODONESEMA(bp);
}
} /* 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 *);