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xfs: Introduce delayed logging core code 

The delayed logging code only changes in-memory structures and as
such can be enabled and disabled with a mount option. Add the mount
option and emit a warning that this is an experimental feature that
should not be used in production yet.

We also need infrastructure to track committed items that have not
yet been written to the log. This is what the Committed Item List
(CIL) is for.

The log item also needs to be extended to track the current log
vector, the associated memory buffer and it's location in the Commit
Item List. Extend the log item and log vector structures to enable
this tracking.

To maintain the current log format for transactions with delayed
logging, we need to introduce a checkpoint transaction and a context
for tracking each checkpoint from initiation to transaction
completion.  This includes adding a log ticket for tracking space
log required/used by the context checkpoint.

To track all the changes we need an io vector array per log item,
rather than a single array for the entire transaction. Using the new
log vector structure for this requires two passes - the first to
allocate the log vector structures and chain them together, and the
second to fill them out.  This log vector chain can then be passed
to the CIL for formatting, pinning and insertion into the CIL.

Formatting of the log vector chain is relatively simple - it's just
a loop over the iovecs on each log vector, but it is made slightly
more complex because we re-write the iovec after the copy to point
back at the memory buffer we just copied into.

This code also needs to pin log items. If the log item is not
already tracked in this checkpoint context, then it needs to be
pinned. Otherwise it is already pinned and we don't need to pin it
again.

The only other complexity is calculating the amount of new log space
the formatting has consumed. This needs to be accounted to the
transaction in progress, and the accounting is made more complex
becase we need also to steal space from it for log metadata in the
checkpoint transaction. Calculate all this at insert time and update
all the tickets, counters, etc correctly.

Once we've formatted all the log items in the transaction, attach
the busy extents to the checkpoint context so the busy extents live
until checkpoint completion and can be processed at that point in
time. Transactions can then be freed at this point in time.

Now we need to issue checkpoints - we are tracking the amount of log space
used by the items in the CIL, so we can trigger background checkpoints when the
space usage gets to a certain threshold. Otherwise, checkpoints need ot be
triggered when a log synchronisation point is reached - a log force event.

Because the log write code already handles chained log vectors, writing the
transaction is trivial, too. Construct a transaction header, add it
to the head of the chain and write it into the log, then issue a
commit record write. Then we can release the checkpoint log ticket
and attach the context to the log buffer so it can be called during
Io completion to complete the checkpoint.

We also need to allow for synchronising multiple in-flight
checkpoints. This is needed for two things - the first is to ensure
that checkpoint commit records appear in the log in the correct
sequence order (so they are replayed in the correct order). The
second is so that xfs_log_force_lsn() operates correctly and only
flushes and/or waits for the specific sequence it was provided with.

To do this we need a wait variable and a list tracking the
checkpoint commits in progress. We can walk this list and wait for
the checkpoints to change state or complete easily, an this provides
the necessary synchronisation for correct operation in both cases.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-05-21 14:37:18 +10:00 committed by Alex Elder
parent a9a745daad
commit 71e330b593
11 changed files with 912 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/xfs/Makefile
View File

@ -77,6 +77,7 @@ xfs-y += xfs_alloc.o \
xfs_itable.o \
xfs_dfrag.o \
xfs_log.o \
xfs_log_cil.o \
xfs_log_recover.o \
xfs_mount.o \
xfs_mru_cache.o \

10
fs/xfs/linux-2.6/xfs_super.c
View File

@ -119,6 +119,8 @@ mempool_t *xfs_ioend_pool;
#define MNTOPT_DMAPI "dmapi" /* DMI enabled (DMAPI / XDSM) */
#define MNTOPT_XDSM "xdsm" /* DMI enabled (DMAPI / XDSM) */
#define MNTOPT_DMI "dmi" /* DMI enabled (DMAPI / XDSM) */
#define MNTOPT_DELAYLOG "delaylog" /* Delayed loging enabled */
#define MNTOPT_NODELAYLOG "nodelaylog" /* Delayed loging disabled */
/*
* Table driven mount option parser.
@ -374,6 +376,13 @@ xfs_parseargs(
mp->m_flags |= XFS_MOUNT_DMAPI;
} else if (!strcmp(this_char, MNTOPT_DMI)) {
mp->m_flags |= XFS_MOUNT_DMAPI;
} else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
mp->m_flags |= XFS_MOUNT_DELAYLOG;
cmn_err(CE_WARN,
"Enabling EXPERIMENTAL delayed logging feature "
"- use at your own risk.\n");
} else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
mp->m_flags &= ~XFS_MOUNT_DELAYLOG;
} else if (!strcmp(this_char, "ihashsize")) {
cmn_err(CE_WARN,
"XFS: ihashsize no longer used, option is deprecated.");
@ -535,6 +544,7 @@ xfs_showargs(
{ XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM },
{ XFS_MOUNT_DMAPI, "," MNTOPT_DMAPI },
{ XFS_MOUNT_GRPID, "," MNTOPT_GRPID },
{ XFS_MOUNT_DELAYLOG, "," MNTOPT_DELAYLOG },
{ 0, NULL }
};
static struct proc_xfs_info xfs_info_unset[] = {

64
fs/xfs/xfs_log.c
View File

@ -54,9 +54,6 @@ STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp,
STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes);
STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog);
STATIC void xlog_dealloc_log(xlog_t *log);
STATIC int xlog_write(struct log *log, struct xfs_log_vec *log_vector,
struct xlog_ticket *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);
@ -86,12 +83,6 @@ STATIC int xlog_regrant_write_log_space(xlog_t *log,
STATIC void xlog_ungrant_log_space(xlog_t *log,
xlog_ticket_t *ticket);
/* local ticket functions */
STATIC xlog_ticket_t *xlog_ticket_alloc(xlog_t *log, int unit_bytes, int count,
char clientid, uint flags,
int alloc_flags);
#if defined(DEBUG)
STATIC void xlog_verify_dest_ptr(xlog_t *log, char *ptr);
STATIC void xlog_verify_grant_head(xlog_t *log, int equals);
@ -460,6 +451,13 @@ xfs_log_mount(
/* Normal transactions can now occur */
mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY;
/*
* Now the log has been fully initialised and we know were our
* space grant counters are, we can initialise the permanent ticket
* needed for delayed logging to work.
*/
xlog_cil_init_post_recovery(mp->m_log);
return 0;
out_destroy_ail:
@ -666,6 +664,10 @@ xfs_log_item_init(
item->li_ailp = mp->m_ail;
item->li_type = type;
item->li_ops = ops;
item->li_lv = NULL;
INIT_LIST_HEAD(&item->li_ail);
INIT_LIST_HEAD(&item->li_cil);
}
/*
@ -1176,6 +1178,9 @@ xlog_alloc_log(xfs_mount_t *mp,
*iclogp = log->l_iclog; /* complete ring */
log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */
error = xlog_cil_init(log);
if (error)
goto out_free_iclog;
return log;
out_free_iclog:
@ -1502,6 +1507,8 @@ xlog_dealloc_log(xlog_t *log)
xlog_in_core_t *iclog, *next_iclog;
int i;
xlog_cil_destroy(log);
iclog = log->l_iclog;
for (i=0; i<log->l_iclog_bufs; i++) {
sv_destroy(&iclog->ic_force_wait);
@ -1544,8 +1551,10 @@ xlog_state_finish_copy(xlog_t *log,
* print out info relating to regions written which consume
* the reservation
*/
STATIC void
xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket)
void
xlog_print_tic_res(
struct xfs_mount *mp,
struct xlog_ticket *ticket)
{
uint i;
uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t);
@ -1877,7 +1886,7 @@ xlog_write_copy_finish(
* we don't update ic_offset until the end when we know exactly how many
* bytes have been written out.
*/
STATIC int
int
xlog_write(
struct log *log,
struct xfs_log_vec *log_vector,
@ -1901,9 +1910,26 @@ xlog_write(
*start_lsn = 0;
len = xlog_write_calc_vec_length(ticket, log_vector);
if (ticket->t_curr_res < len)
if (log->l_cilp) {
/*
* Region headers and bytes are already accounted for.
* We only need to take into account start records and
* split regions in this function.
*/
if (ticket->t_flags & XLOG_TIC_INITED)
ticket->t_curr_res -= sizeof(xlog_op_header_t);
/*
* Commit record headers need to be accounted for. These
* come in as separate writes so are easy to detect.
*/
if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS))
ticket->t_curr_res -= sizeof(xlog_op_header_t);
} else
ticket->t_curr_res -= len;
if (ticket->t_curr_res < 0)
xlog_print_tic_res(log->l_mp, ticket);
ticket->t_curr_res -= len;
index = 0;
lv = log_vector;
@ -2999,6 +3025,8 @@ _xfs_log_force(
XFS_STATS_INC(xs_log_force);
xlog_cil_push(log, 1);
spin_lock(&log->l_icloglock);
iclog = log->l_iclog;
@ -3148,6 +3176,12 @@ _xfs_log_force_lsn(
XFS_STATS_INC(xs_log_force);
if (log->l_cilp) {
lsn = xlog_cil_push_lsn(log, lsn);
if (lsn == NULLCOMMITLSN)
return 0;
}
try_again:
spin_lock(&log->l_icloglock);
iclog = log->l_iclog;
@ -3322,7 +3356,7 @@ xfs_log_get_trans_ident(
/*
* Allocate and initialise a new log ticket.
*/
STATIC xlog_ticket_t *
xlog_ticket_t *
xlog_ticket_alloc(
struct log *log,
int unit_bytes,

9
fs/xfs/xfs_log.h
View File

@ -113,6 +113,9 @@ struct xfs_log_vec {
struct xfs_log_vec *lv_next; /* next lv in build list */
int lv_niovecs; /* number of iovecs in lv */
struct xfs_log_iovec *lv_iovecp; /* iovec array */
struct xfs_log_item *lv_item; /* owner */
char *lv_buf; /* formatted buffer */
int lv_buf_len; /* size of formatted buffer */
};
/*
@ -187,11 +190,15 @@ int xfs_log_need_covered(struct xfs_mount *mp);
void xlog_iodone(struct xfs_buf *);
struct xlog_ticket * xfs_log_ticket_get(struct xlog_ticket *ticket);
struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
void xfs_log_ticket_put(struct xlog_ticket *ticket);
xlog_tid_t xfs_log_get_trans_ident(struct xfs_trans *tp);
int xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
struct xfs_log_vec *log_vector,
xfs_lsn_t *commit_lsn, int flags);
#endif

659
fs/xfs/xfs_log_cil.c Normal file
View File

@ -0,0 +1,659 @@
/*
* Copyright (c) 2010 Red Hat, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_log_priv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_error.h"
#include "xfs_alloc.h"
/*
* Perform initial CIL structure initialisation. If the CIL is not
* enabled in this filesystem, ensure the log->l_cilp is null so
* we can check this conditional to determine if we are doing delayed
* logging or not.
*/
int
xlog_cil_init(
struct log *log)
{
struct xfs_cil *cil;
struct xfs_cil_ctx *ctx;
log->l_cilp = NULL;
if (!(log->l_mp->m_flags & XFS_MOUNT_DELAYLOG))
return 0;
cil = kmem_zalloc(sizeof(*cil), KM_SLEEP|KM_MAYFAIL);
if (!cil)
return ENOMEM;
ctx = kmem_zalloc(sizeof(*ctx), KM_SLEEP|KM_MAYFAIL);
if (!ctx) {
kmem_free(cil);
return ENOMEM;
}
INIT_LIST_HEAD(&cil->xc_cil);
INIT_LIST_HEAD(&cil->xc_committing);
spin_lock_init(&cil->xc_cil_lock);
init_rwsem(&cil->xc_ctx_lock);
sv_init(&cil->xc_commit_wait, SV_DEFAULT, "cilwait");
INIT_LIST_HEAD(&ctx->committing);
INIT_LIST_HEAD(&ctx->busy_extents);
ctx->sequence = 1;
ctx->cil = cil;
cil->xc_ctx = ctx;
cil->xc_log = log;
log->l_cilp = cil;
return 0;
}
void
xlog_cil_destroy(
struct log *log)
{
if (!log->l_cilp)
return;
if (log->l_cilp->xc_ctx) {
if (log->l_cilp->xc_ctx->ticket)
xfs_log_ticket_put(log->l_cilp->xc_ctx->ticket);
kmem_free(log->l_cilp->xc_ctx);
}
ASSERT(list_empty(&log->l_cilp->xc_cil));
kmem_free(log->l_cilp);
}
/*
* Allocate a new ticket. Failing to get a new ticket makes it really hard to
* recover, so we don't allow failure here. Also, we allocate in a context that
* we don't want to be issuing transactions from, so we need to tell the
* allocation code this as well.
*
* We don't reserve any space for the ticket - we are going to steal whatever
* space we require from transactions as they commit. To ensure we reserve all
* the space required, we need to set the current reservation of the ticket to
* zero so that we know to steal the initial transaction overhead from the
* first transaction commit.
*/
static struct xlog_ticket *
xlog_cil_ticket_alloc(
struct log *log)
{
struct xlog_ticket *tic;
tic = xlog_ticket_alloc(log, 0, 1, XFS_TRANSACTION, 0,
KM_SLEEP|KM_NOFS);
tic->t_trans_type = XFS_TRANS_CHECKPOINT;
/*
* set the current reservation to zero so we know to steal the basic
* transaction overhead reservation from the first transaction commit.
*/
tic->t_curr_res = 0;
return tic;
}
/*
* After the first stage of log recovery is done, we know where the head and
* tail of the log are. We need this log initialisation done before we can
* initialise the first CIL checkpoint context.
*
* Here we allocate a log ticket to track space usage during a CIL push. This
* ticket is passed to xlog_write() directly so that we don't slowly leak log
* space by failing to account for space used by log headers and additional
* region headers for split regions.
*/
void
xlog_cil_init_post_recovery(
struct log *log)
{
if (!log->l_cilp)
return;
log->l_cilp->xc_ctx->ticket = xlog_cil_ticket_alloc(log);
log->l_cilp->xc_ctx->sequence = 1;
log->l_cilp->xc_ctx->commit_lsn = xlog_assign_lsn(log->l_curr_cycle,
log->l_curr_block);
}
/*
* Insert the log item into the CIL and calculate the difference in space
* consumed by the item. Add the space to the checkpoint ticket and calculate
* if the change requires additional log metadata. If it does, take that space
* as well. Remove the amount of space we addded to the checkpoint ticket from
* the current transaction ticket so that the accounting works out correctly.
*
* If this is the first time the item is being placed into the CIL in this
* context, pin it so it can't be written to disk until the CIL is flushed to
* the iclog and the iclog written to disk.
*/
static void
xlog_cil_insert(
struct log *log,
struct xlog_ticket *ticket,
struct xfs_log_item *item,
struct xfs_log_vec *lv)
{
struct xfs_cil *cil = log->l_cilp;
struct xfs_log_vec *old = lv->lv_item->li_lv;
struct xfs_cil_ctx *ctx = cil->xc_ctx;
int len;
int diff_iovecs;
int iclog_space;
if (old) {
/* existing lv on log item, space used is a delta */
ASSERT(!list_empty(&item->li_cil));
ASSERT(old->lv_buf && old->lv_buf_len && old->lv_niovecs);
len = lv->lv_buf_len - old->lv_buf_len;
diff_iovecs = lv->lv_niovecs - old->lv_niovecs;
kmem_free(old->lv_buf);
kmem_free(old);
} else {
/* new lv, must pin the log item */
ASSERT(!lv->lv_item->li_lv);
ASSERT(list_empty(&item->li_cil));
len = lv->lv_buf_len;
diff_iovecs = lv->lv_niovecs;
IOP_PIN(lv->lv_item);
}
len += diff_iovecs * sizeof(xlog_op_header_t);
/* attach new log vector to log item */
lv->lv_item->li_lv = lv;
spin_lock(&cil->xc_cil_lock);
list_move_tail(&item->li_cil, &cil->xc_cil);
ctx->nvecs += diff_iovecs;
/*
* Now transfer enough transaction reservation to the context ticket
* for the checkpoint. The context ticket is special - the unit
* reservation has to grow as well as the current reservation as we
* steal from tickets so we can correctly determine the space used
* during the transaction commit.
*/
if (ctx->ticket->t_curr_res == 0) {
/* first commit in checkpoint, steal the header reservation */
ASSERT(ticket->t_curr_res >= ctx->ticket->t_unit_res + len);
ctx->ticket->t_curr_res = ctx->ticket->t_unit_res;
ticket->t_curr_res -= ctx->ticket->t_unit_res;
}
/* do we need space for more log record headers? */
iclog_space = log->l_iclog_size - log->l_iclog_hsize;
if (len > 0 && (ctx->space_used / iclog_space !=
(ctx->space_used + len) / iclog_space)) {
int hdrs;
hdrs = (len + iclog_space - 1) / iclog_space;
/* need to take into account split region headers, too */
hdrs *= log->l_iclog_hsize + sizeof(struct xlog_op_header);
ctx->ticket->t_unit_res += hdrs;
ctx->ticket->t_curr_res += hdrs;
ticket->t_curr_res -= hdrs;
ASSERT(ticket->t_curr_res >= len);
}
ticket->t_curr_res -= len;
ctx->space_used += len;
spin_unlock(&cil->xc_cil_lock);
}
/*
* Format log item into a flat buffers
*
* For delayed logging, we need to hold a formatted buffer containing all the
* changes on the log item. This enables us to relog the item in memory and
* write it out asynchronously without needing to relock the object that was
* modified at the time it gets written into the iclog.
*
* This function builds a vector for the changes in each log item in the
* transaction. It then works out the length of the buffer needed for each log
* item, allocates them and formats the vector for the item into the buffer.
* The buffer is then attached to the log item are then inserted into the
* Committed Item List for tracking until the next checkpoint is written out.
*
* We don't set up region headers during this process; we simply copy the
* regions into the flat buffer. We can do this because we still have to do a
* formatting step to write the regions into the iclog buffer. Writing the
* ophdrs during the iclog write means that we can support splitting large
* regions across iclog boundares without needing a change in the format of the
* item/region encapsulation.
*
* Hence what we need to do now is change the rewrite the vector array to point
* to the copied region inside the buffer we just allocated. This allows us to
* format the regions into the iclog as though they are being formatted
* directly out of the objects themselves.
*/
static void
xlog_cil_format_items(
struct log *log,
struct xfs_log_vec *log_vector,
struct xlog_ticket *ticket,
xfs_lsn_t *start_lsn)
{
struct xfs_log_vec *lv;
if (start_lsn)
*start_lsn = log->l_cilp->xc_ctx->sequence;
ASSERT(log_vector);
for (lv = log_vector; lv; lv = lv->lv_next) {
void *ptr;
int index;
int len = 0;
/* build the vector array and calculate it's length */
IOP_FORMAT(lv->lv_item, lv->lv_iovecp);
for (index = 0; index < lv->lv_niovecs; index++)
len += lv->lv_iovecp[index].i_len;
lv->lv_buf_len = len;
lv->lv_buf = kmem_zalloc(lv->lv_buf_len, KM_SLEEP|KM_NOFS);
ptr = lv->lv_buf;
for (index = 0; index < lv->lv_niovecs; index++) {
struct xfs_log_iovec *vec = &lv->lv_iovecp[index];
memcpy(ptr, vec->i_addr, vec->i_len);
vec->i_addr = ptr;
ptr += vec->i_len;
}
ASSERT(ptr == lv->lv_buf + lv->lv_buf_len);
xlog_cil_insert(log, ticket, lv->lv_item, lv);
}
}
static void
xlog_cil_free_logvec(
struct xfs_log_vec *log_vector)
{
struct xfs_log_vec *lv;
for (lv = log_vector; lv; ) {
struct xfs_log_vec *next = lv->lv_next;
kmem_free(lv->lv_buf);
kmem_free(lv);
lv = next;
}
}
/*
* Commit a transaction with the given vector to the Committed Item List.
*
* To do this, we need to format the item, pin it in memory if required and
* account for the space used by the transaction. Once we have done that we
* need to release the unused reservation for the transaction, attach the
* transaction to the checkpoint context so we carry the busy extents through
* to checkpoint completion, and then unlock all the items in the transaction.
*
* For more specific information about the order of operations in
* xfs_log_commit_cil() please refer to the comments in
* xfs_trans_commit_iclog().
*/
int
xfs_log_commit_cil(
struct xfs_mount *mp,
struct xfs_trans *tp,
struct xfs_log_vec *log_vector,
xfs_lsn_t *commit_lsn,
int flags)
{
struct log *log = mp->m_log;
int log_flags = 0;
if (flags & XFS_TRANS_RELEASE_LOG_RES)
log_flags = XFS_LOG_REL_PERM_RESERV;
if (XLOG_FORCED_SHUTDOWN(log)) {
xlog_cil_free_logvec(log_vector);
return XFS_ERROR(EIO);
}
/* lock out background commit */
down_read(&log->l_cilp->xc_ctx_lock);
xlog_cil_format_items(log, log_vector, tp->t_ticket, commit_lsn);
/* check we didn't blow the reservation */
if (tp->t_ticket->t_curr_res < 0)
xlog_print_tic_res(log->l_mp, tp->t_ticket);
/* attach the transaction to the CIL if it has any busy extents */
if (!list_empty(&tp->t_busy)) {
spin_lock(&log->l_cilp->xc_cil_lock);
list_splice_init(&tp->t_busy,
&log->l_cilp->xc_ctx->busy_extents);
spin_unlock(&log->l_cilp->xc_cil_lock);
}
tp->t_commit_lsn = *commit_lsn;
xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
xfs_trans_unreserve_and_mod_sb(tp);
/* background commit is allowed again */
up_read(&log->l_cilp->xc_ctx_lock);
return 0;
}
/*
* Mark all items committed and clear busy extents. We free the log vector
* chains in a separate pass so that we unpin the log items as quickly as
* possible.
*/
static void
xlog_cil_committed(
void *args,
int abort)
{
struct xfs_cil_ctx *ctx = args;
struct xfs_log_vec *lv;
int abortflag = abort ? XFS_LI_ABORTED : 0;
struct xfs_busy_extent *busyp, *n;
/* unpin all the log items */
for (lv = ctx->lv_chain; lv; lv = lv->lv_next ) {
xfs_trans_item_committed(lv->lv_item, ctx->start_lsn,
abortflag);
}
list_for_each_entry_safe(busyp, n, &ctx->busy_extents, list)
xfs_alloc_busy_clear(ctx->cil->xc_log->l_mp, busyp);
spin_lock(&ctx->cil->xc_cil_lock);
list_del(&ctx->committing);
spin_unlock(&ctx->cil->xc_cil_lock);
xlog_cil_free_logvec(ctx->lv_chain);
kmem_free(ctx);
}
/*
* Push the Committed Item List to the log. If the push_now flag is not set,
* then it is a background flush and so we can chose to ignore it.
*/
int
xlog_cil_push(
struct log *log,
int push_now)
{
struct xfs_cil *cil = log->l_cilp;
struct xfs_log_vec *lv;
struct xfs_cil_ctx *ctx;
struct xfs_cil_ctx *new_ctx;
struct xlog_in_core *commit_iclog;
struct xlog_ticket *tic;
int num_lv;
int num_iovecs;
int len;
int error = 0;
struct xfs_trans_header thdr;
struct xfs_log_iovec lhdr;
struct xfs_log_vec lvhdr = { NULL };
xfs_lsn_t commit_lsn;
if (!cil)
return 0;
/* XXX: don't sleep for background? */
new_ctx = kmem_zalloc(sizeof(*new_ctx), KM_SLEEP|KM_NOFS);
new_ctx->ticket = xlog_cil_ticket_alloc(log);
/* lock out transaction commit */
down_write(&cil->xc_ctx_lock);
ctx = cil->xc_ctx;
/* check if we've anything to push */
if (list_empty(&cil->xc_cil))
goto out_skip;
/*
* pull all the log vectors off the items in the CIL, and
* remove the items from the CIL. We don't need the CIL lock
* here because it's only needed on the transaction commit
* side which is currently locked out by the flush lock.
*/
lv = NULL;
num_lv = 0;
num_iovecs = 0;
len = 0;
while (!list_empty(&cil->xc_cil)) {
struct xfs_log_item *item;
int i;
item = list_first_entry(&cil->xc_cil,
struct xfs_log_item, li_cil);
list_del_init(&item->li_cil);
if (!ctx->lv_chain)
ctx->lv_chain = item->li_lv;
else
lv->lv_next = item->li_lv;
lv = item->li_lv;
item->li_lv = NULL;
num_lv++;
num_iovecs += lv->lv_niovecs;
for (i = 0; i < lv->lv_niovecs; i++)
len += lv->lv_iovecp[i].i_len;
}
/*
* initialise the new context and attach it to the CIL. Then attach
* the current context to the CIL committing lsit so it can be found
* during log forces to extract the commit lsn of the sequence that
* needs to be forced.
*/
INIT_LIST_HEAD(&new_ctx->committing);
INIT_LIST_HEAD(&new_ctx->busy_extents);
new_ctx->sequence = ctx->sequence + 1;
new_ctx->cil = cil;
cil->xc_ctx = new_ctx;
/*
* The switch is now done, so we can drop the context lock and move out
* of a shared context. We can't just go straight to the commit record,
* though - we need to synchronise with previous and future commits so
* that the commit records are correctly ordered in the log to ensure
* that we process items during log IO completion in the correct order.
*
* For example, if we get an EFI in one checkpoint and the EFD in the
* next (e.g. due to log forces), we do not want the checkpoint with
* the EFD to be committed before the checkpoint with the EFI. Hence
* we must strictly order the commit records of the checkpoints so
* that: a) the checkpoint callbacks are attached to the iclogs in the
* correct order; and b) the checkpoints are replayed in correct order
* in log recovery.
*
* Hence we need to add this context to the committing context list so
* that higher sequences will wait for us to write out a commit record
* before they do.
*/
spin_lock(&cil->xc_cil_lock);
list_add(&ctx->committing, &cil->xc_committing);
spin_unlock(&cil->xc_cil_lock);
up_write(&cil->xc_ctx_lock);
/*
* Build a checkpoint transaction header and write it to the log to
* begin the transaction. We need to account for the space used by the
* transaction header here as it is not accounted for in xlog_write().
*
* The LSN we need to pass to the log items on transaction commit is
* the LSN reported by the first log vector write. If we use the commit
* record lsn then we can move the tail beyond the grant write head.
*/
tic = ctx->ticket;
thdr.th_magic = XFS_TRANS_HEADER_MAGIC;
thdr.th_type = XFS_TRANS_CHECKPOINT;
thdr.th_tid = tic->t_tid;
thdr.th_num_items = num_iovecs;
lhdr.i_addr = (xfs_caddr_t)&thdr;
lhdr.i_len = sizeof(xfs_trans_header_t);
lhdr.i_type = XLOG_REG_TYPE_TRANSHDR;
tic->t_curr_res -= lhdr.i_len + sizeof(xlog_op_header_t);
lvhdr.lv_niovecs = 1;
lvhdr.lv_iovecp = &lhdr;
lvhdr.lv_next = ctx->lv_chain;
error = xlog_write(log, &lvhdr, tic, &ctx->start_lsn, NULL, 0);
if (error)
goto out_abort;
/*
* now that we've written the checkpoint into the log, strictly
* order the commit records so replay will get them in the right order.
*/
restart:
spin_lock(&cil->xc_cil_lock);
list_for_each_entry(new_ctx, &cil->xc_committing, committing) {
/*
* Higher sequences will wait for this one so skip them.
* Don't wait for own own sequence, either.
*/
if (new_ctx->sequence >= ctx->sequence)
continue;
if (!new_ctx->commit_lsn) {
/*
* It is still being pushed! Wait for the push to
* complete, then start again from the beginning.
*/
sv_wait(&cil->xc_commit_wait, 0, &cil->xc_cil_lock, 0);
goto restart;
}
}
spin_unlock(&cil->xc_cil_lock);
commit_lsn = xfs_log_done(log->l_mp, tic, &commit_iclog, 0);
if (error || commit_lsn == -1)
goto out_abort;
/* attach all the transactions w/ busy extents to iclog */
ctx->log_cb.cb_func = xlog_cil_committed;
ctx->log_cb.cb_arg = ctx;
error = xfs_log_notify(log->l_mp, commit_iclog, &ctx->log_cb);
if (error)
goto out_abort;
/*
* now the checkpoint commit is complete and we've attached the
* callbacks to the iclog we can assign the commit LSN to the context
* and wake up anyone who is waiting for the commit to complete.
*/
spin_lock(&cil->xc_cil_lock);
ctx->commit_lsn = commit_lsn;
sv_broadcast(&cil->xc_commit_wait);
spin_unlock(&cil->xc_cil_lock);
/* release the hounds! */
return xfs_log_release_iclog(log->l_mp, commit_iclog);
out_skip:
up_write(&cil->xc_ctx_lock);
xfs_log_ticket_put(new_ctx->ticket);
kmem_free(new_ctx);
return 0;
out_abort:
xlog_cil_committed(ctx, XFS_LI_ABORTED);
return XFS_ERROR(EIO);
}
/*
* Conditionally push the CIL based on the sequence passed in.
*
* We only need to push if we haven't already pushed the sequence
* number given. Hence the only time we will trigger a push here is
* if the push sequence is the same as the current context.
*
* We return the current commit lsn to allow the callers to determine if a
* iclog flush is necessary following this call.
*
* XXX: Initially, just push the CIL unconditionally and return whatever
* commit lsn is there. It'll be empty, so this is broken for now.
*/
xfs_lsn_t
xlog_cil_push_lsn(
struct log *log,
xfs_lsn_t push_seq)
{
struct xfs_cil *cil = log->l_cilp;
struct xfs_cil_ctx *ctx;
xfs_lsn_t commit_lsn = NULLCOMMITLSN;
restart:
down_write(&cil->xc_ctx_lock);
ASSERT(push_seq <= cil->xc_ctx->sequence);
/* check to see if we need to force out the current context */
if (push_seq == cil->xc_ctx->sequence) {
up_write(&cil->xc_ctx_lock);
xlog_cil_push(log, 1);
goto restart;
}
/*
* See if we can find a previous sequence still committing.
* We can drop the flush lock as soon as we have the cil lock
* because we are now only comparing contexts protected by
* the cil lock.
*
* We need to wait for all previous sequence commits to complete
* before allowing the force of push_seq to go ahead. Hence block
* on commits for those as well.
*/
spin_lock(&cil->xc_cil_lock);
up_write(&cil->xc_ctx_lock);
list_for_each_entry(ctx, &cil->xc_committing, committing) {
if (ctx->sequence > push_seq)
continue;
if (!ctx->commit_lsn) {
/*
* It is still being pushed! Wait for the push to
* complete, then start again from the beginning.
*/
sv_wait(&cil->xc_commit_wait, 0, &cil->xc_cil_lock, 0);
goto restart;
}
if (ctx->sequence != push_seq)
continue;
/* found it! */
commit_lsn = ctx->commit_lsn;
}
spin_unlock(&cil->xc_cil_lock);
return commit_lsn;
}

71
fs/xfs/xfs_log_priv.h
View File

@ -376,6 +376,54 @@ typedef struct xlog_in_core {
#define ic_header ic_data->hic_header
} xlog_in_core_t;
/*
* The CIL context is used to aggregate per-transaction details as well be
* passed to the iclog for checkpoint post-commit processing. After being
* passed to the iclog, another context needs to be allocated for tracking the
* next set of transactions to be aggregated into a checkpoint.
*/
struct xfs_cil;
struct xfs_cil_ctx {
struct xfs_cil *cil;
xfs_lsn_t sequence; /* chkpt sequence # */
xfs_lsn_t start_lsn; /* first LSN of chkpt commit */
xfs_lsn_t commit_lsn; /* chkpt commit record lsn */
struct xlog_ticket *ticket; /* chkpt ticket */
int nvecs; /* number of regions */
int space_used; /* aggregate size of regions */
struct list_head busy_extents; /* busy extents in chkpt */
struct xfs_log_vec *lv_chain; /* logvecs being pushed */
xfs_log_callback_t log_cb; /* completion callback hook. */
struct list_head committing; /* ctx committing list */
};
/*
* Committed Item List structure
*
* This structure is used to track log items that have been committed but not
* yet written into the log. It is used only when the delayed logging mount
* option is enabled.
*
* This structure tracks the list of committing checkpoint contexts so
* we can avoid the problem of having to hold out new transactions during a
* flush until we have a the commit record LSN of the checkpoint. We can
* traverse the list of committing contexts in xlog_cil_push_lsn() to find a
* sequence match and extract the commit LSN directly from there. If the
* checkpoint is still in the process of committing, we can block waiting for
* the commit LSN to be determined as well. This should make synchronous
* operations almost as efficient as the old logging methods.
*/
struct xfs_cil {
struct log *xc_log;
struct list_head xc_cil;
spinlock_t xc_cil_lock;
struct xfs_cil_ctx *xc_ctx;
struct rw_semaphore xc_ctx_lock;
struct list_head xc_committing;
sv_t xc_commit_wait;
};
/*
* The reservation head lsn is not made up of a cycle number and block number.
* Instead, it uses a cycle number and byte number. Logs don't expect to
@ -386,6 +434,7 @@ typedef struct log {
/* The following fields don't need locking */
struct xfs_mount *l_mp; /* mount point */
struct xfs_ail *l_ailp; /* AIL log is working with */
struct xfs_cil *l_cilp; /* CIL log is working with */
struct xfs_buf *l_xbuf; /* extra buffer for log
* wrapping */
struct xfs_buftarg *l_targ; /* buftarg of log */
@ -436,14 +485,17 @@ typedef struct log {
#define XLOG_FORCED_SHUTDOWN(log) ((log)->l_flags & XLOG_IO_ERROR)
/* common routines */
extern xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
extern int xlog_recover(xlog_t *log);
extern int xlog_recover_finish(xlog_t *log);
extern void xlog_pack_data(xlog_t *log, xlog_in_core_t *iclog, int);
extern kmem_zone_t *xfs_log_ticket_zone;
extern kmem_zone_t *xfs_log_ticket_zone;
struct xlog_ticket *xlog_ticket_alloc(struct log *log, int unit_bytes,
int count, char client, uint xflags,
int alloc_flags);
static inline void
xlog_write_adv_cnt(void **ptr, int *len, int *off, size_t bytes)
@ -453,6 +505,21 @@ xlog_write_adv_cnt(void **ptr, int *len, int *off, size_t bytes)
*off += bytes;
}
void xlog_print_tic_res(struct xfs_mount *mp, struct xlog_ticket *ticket);
int xlog_write(struct log *log, struct xfs_log_vec *log_vector,
struct xlog_ticket *tic, xfs_lsn_t *start_lsn,
xlog_in_core_t **commit_iclog, uint flags);
/*
* Committed Item List interfaces
*/
int xlog_cil_init(struct log *log);
void xlog_cil_init_post_recovery(struct log *log);
void xlog_cil_destroy(struct log *log);
int xlog_cil_push(struct log *log, int push_now);
xfs_lsn_t xlog_cil_push_lsn(struct log *log, xfs_lsn_t push_sequence);
/*
* Unmount record type is used as a pseudo transaction type for the ticket.
* It's value must be outside the range of XFS_TRANS_* values.

1
fs/xfs/xfs_mount.h
View File

@ -268,6 +268,7 @@ typedef struct xfs_mount {
#define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
must be synchronous except
for space allocations */
#define XFS_MOUNT_DELAYLOG (1ULL << 1) /* delayed logging is enabled */
#define XFS_MOUNT_DMAPI (1ULL << 2) /* dmapi is enabled */
#define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
#define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem

103
fs/xfs/xfs_trans.c
View File

@ -655,7 +655,7 @@ xfs_trans_apply_sb_deltas(
* XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
* still need to update the incore superblock with the changes.
*/
STATIC void
void
xfs_trans_unreserve_and_mod_sb(
xfs_trans_t *tp)
{
@ -883,7 +883,7 @@ xfs_trans_fill_vecs(
* they could be immediately flushed and we'd have to race with the flusher
* trying to pull the item from the AIL as we add it.
*/
static void
void
xfs_trans_item_committed(
struct xfs_log_item *lip,
xfs_lsn_t commit_lsn,
@ -994,7 +994,7 @@ xfs_trans_uncommit(
xfs_trans_unreserve_and_mod_sb(tp);
xfs_trans_unreserve_and_mod_dquots(tp);
xfs_trans_free_items(tp, flags);
xfs_trans_free_items(tp, NULLCOMMITLSN, flags);
xfs_trans_free(tp);
}
@ -1144,6 +1144,93 @@ xfs_trans_commit_iclog(
return xfs_log_release_iclog(mp, commit_iclog);
}
/*
* Walk the log items and allocate log vector structures for
* each item large enough to fit all the vectors they require.
* Note that this format differs from the old log vector format in
* that there is no transaction header in these log vectors.
*/
STATIC struct xfs_log_vec *
xfs_trans_alloc_log_vecs(
xfs_trans_t *tp)
{
xfs_log_item_desc_t *lidp;
struct xfs_log_vec *lv = NULL;
struct xfs_log_vec *ret_lv = NULL;
lidp = xfs_trans_first_item(tp);
/* Bail out if we didn't find a log item. */
if (!lidp) {
ASSERT(0);
return NULL;
}
while (lidp != NULL) {
struct xfs_log_vec *new_lv;
/* Skip items which aren't dirty in this transaction. */
if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
lidp = xfs_trans_next_item(tp, lidp);
continue;
}
/* Skip items that do not have any vectors for writing */
lidp->lid_size = IOP_SIZE(lidp->lid_item);
if (!lidp->lid_size) {
lidp = xfs_trans_next_item(tp, lidp);
continue;
}
new_lv = kmem_zalloc(sizeof(*new_lv) +
lidp->lid_size * sizeof(struct xfs_log_iovec),
KM_SLEEP);
/* The allocated iovec region lies beyond the log vector. */
new_lv->lv_iovecp = (struct xfs_log_iovec *)&new_lv[1];
new_lv->lv_niovecs = lidp->lid_size;
new_lv->lv_item = lidp->lid_item;
if (!ret_lv)
ret_lv = new_lv;
else
lv->lv_next = new_lv;
lv = new_lv;
lidp = xfs_trans_next_item(tp, lidp);
}
return ret_lv;
}
static int
xfs_trans_commit_cil(
struct xfs_mount *mp,
struct xfs_trans *tp,
xfs_lsn_t *commit_lsn,
int flags)
{
struct xfs_log_vec *log_vector;
int error;
/*
* Get each log item to allocate a vector structure for
* the log item to to pass to the log write code. The
* CIL commit code will format the vector and save it away.
*/
log_vector = xfs_trans_alloc_log_vecs(tp);
if (!log_vector)
return ENOMEM;
error = xfs_log_commit_cil(mp, tp, log_vector, commit_lsn, flags);
if (error)
return error;
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
/* xfs_trans_free_items() unlocks them first */
xfs_trans_free_items(tp, *commit_lsn, 0);
xfs_trans_free(tp);
return 0;
}
/*
* xfs_trans_commit
@ -1204,7 +1291,11 @@ _xfs_trans_commit(
xfs_trans_apply_sb_deltas(tp);
xfs_trans_apply_dquot_deltas(tp);
error = xfs_trans_commit_iclog(mp, tp, &commit_lsn, flags);
if (mp->m_flags & XFS_MOUNT_DELAYLOG)
error = xfs_trans_commit_cil(mp, tp, &commit_lsn, flags);
else
error = xfs_trans_commit_iclog(mp, tp, &commit_lsn, flags);
if (error == ENOMEM) {
xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
error = XFS_ERROR(EIO);
@ -1242,7 +1333,7 @@ out_unreserve:
error = XFS_ERROR(EIO);
}
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
xfs_trans_free_items(tp, error ? XFS_TRANS_ABORT : 0);
xfs_trans_free_items(tp, NULLCOMMITLSN, error ? XFS_TRANS_ABORT : 0);
xfs_trans_free(tp);
XFS_STATS_INC(xs_trans_empty);
@ -1320,7 +1411,7 @@ xfs_trans_cancel(
/* mark this thread as no longer being in a transaction */
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
xfs_trans_free_items(tp, flags);
xfs_trans_free_items(tp, NULLCOMMITLSN, flags);
xfs_trans_free(tp);
}

8
fs/xfs/xfs_trans.h
View File

@ -106,7 +106,8 @@ typedef struct xfs_trans_header {
#define XFS_TRANS_GROWFSRT_FREE 39
#define XFS_TRANS_SWAPEXT 40
#define XFS_TRANS_SB_COUNT 41
#define XFS_TRANS_TYPE_MAX 41
#define XFS_TRANS_CHECKPOINT 42
#define XFS_TRANS_TYPE_MAX 42
/* new transaction types need to be reflected in xfs_logprint(8) */
#define XFS_TRANS_TYPES \
@ -148,6 +149,7 @@ typedef struct xfs_trans_header {
{ XFS_TRANS_GROWFSRT_FREE, "GROWFSRT_FREE" }, \
{ XFS_TRANS_SWAPEXT, "SWAPEXT" }, \
{ XFS_TRANS_SB_COUNT, "SB_COUNT" }, \
{ XFS_TRANS_CHECKPOINT, "CHECKPOINT" }, \
{ XFS_TRANS_DUMMY1, "DUMMY1" }, \
{ XFS_TRANS_DUMMY2, "DUMMY2" }, \
{ XLOG_UNMOUNT_REC_TYPE, "UNMOUNT" }
@ -829,6 +831,10 @@ typedef struct xfs_log_item {
/* buffer item iodone */
/* callback func */
struct xfs_item_ops *li_ops; /* function list */
/* delayed logging */
struct list_head li_cil; /* CIL pointers */
struct xfs_log_vec *li_lv; /* active log vector */
} xfs_log_item_t;
#define XFS_LI_IN_AIL 0x1

5
fs/xfs/xfs_trans_item.c
View File

@ -299,6 +299,7 @@ xfs_trans_next_item(xfs_trans_t *tp, xfs_log_item_desc_t *lidp)
void
xfs_trans_free_items(
xfs_trans_t *tp,
xfs_lsn_t commit_lsn,
int flags)
{
xfs_log_item_chunk_t *licp;
@ -311,7 +312,7 @@ xfs_trans_free_items(
* Special case the embedded chunk so we don't free it below.
*/
if (!xfs_lic_are_all_free(licp)) {
(void) xfs_trans_unlock_chunk(licp, 1, abort, NULLCOMMITLSN);
(void) xfs_trans_unlock_chunk(licp, 1, abort, commit_lsn);
xfs_lic_all_free(licp);
licp->lic_unused = 0;
}
@ -322,7 +323,7 @@ xfs_trans_free_items(
*/
while (licp != NULL) {
ASSERT(!xfs_lic_are_all_free(licp));
(void) xfs_trans_unlock_chunk(licp, 1, abort, NULLCOMMITLSN);
(void) xfs_trans_unlock_chunk(licp, 1, abort, commit_lsn);
next_licp = licp->lic_next;
kmem_free(licp);
licp = next_licp;

11
fs/xfs/xfs_trans_priv.h
View File

@ -35,9 +35,14 @@ struct xfs_log_item_desc *xfs_trans_find_item(struct xfs_trans *,
struct xfs_log_item_desc *xfs_trans_first_item(struct xfs_trans *);
struct xfs_log_item_desc *xfs_trans_next_item(struct xfs_trans *,
struct xfs_log_item_desc *);
void xfs_trans_free_items(struct xfs_trans *, int);
void xfs_trans_unlock_items(struct xfs_trans *,
xfs_lsn_t);
void xfs_trans_unlock_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn);
void xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
int flags);
void xfs_trans_item_committed(struct xfs_log_item *lip,
xfs_lsn_t commit_lsn, int aborted);
void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
/*
* AIL traversal cursor.