[PATCH 23/45] xfs: log tickets don't need log client id

Dave Chinner
2021-03-05T05:12:26Z

From: Dave Chinner <dchinner@redhat.com>

We currently set the log ticket client ID when we reserve a
transaction. This client ID is only ever written to the log by
a CIL checkpoint or unmount records, and so anything using a high
level transaction allocated through xfs_trans_alloc() does not need
a log ticket client ID to be set.

For the CIL checkpoint, the client ID written to the journal is
always XFS_TRANSACTION, and for the unmount record it is always
XFS_LOG, and nothing else writes to the log. All of these operations
tell xlog_write() exactly what they need to write to the log (the
optype) and build their own opheaders for start, commit and unmount
records. Hence we no longer need to set the client id in either the
log ticket or the xfs_trans.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_log.c | 47 ++++++++-----------------------------------
fs/xfs/xfs_log.h | 16 ++++++---------
fs/xfs/xfs_log_cil.c | 2 +-
fs/xfs/xfs_log_priv.h | 10 ++-------
fs/xfs/xfs_trans.c | 6 ++----
5 files changed, 19 insertions(+), 62 deletions(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index c2e69a1f5cad..429cb1e7cc67 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -431,10 +431,9 @@ xfs_log_regrant(
int
xfs_log_reserve(
struct xfs_mount *mp,
- int unit_bytes,
- int cnt,
+ int unit_bytes,
+ int cnt,
struct xlog_ticket **ticp,
- uint8_t client,
bool permanent)
{
struct xlog *log = mp->m_log;
@@ -442,15 +441,13 @@ xfs_log_reserve(
int need_bytes;
int error = 0;

- ASSERT(client == XFS_TRANSACTION || client == XFS_LOG);
-
if (XLOG_FORCED_SHUTDOWN(log))
return -EIO;

XFS_STATS_INC(mp, xs_try_logspace);

ASSERT(*ticp == NULL);
- tic = xlog_ticket_alloc(log, unit_bytes, cnt, client, permanent);
+ tic = xlog_ticket_alloc(log, unit_bytes, cnt, permanent);
*ticp = tic;

xlog_grant_push_ail(log, tic->t_cnt ? tic->t_unit_res * tic->t_cnt
@@ -847,7 +844,7 @@ xlog_unmount_write(
struct xlog_ticket *tic = NULL;
int error;

- error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0);
+ error = xfs_log_reserve(mp, 600, 1, &tic, 0);
if (error)
goto out_err;

@@ -2170,35 +2167,13 @@ xlog_write_calc_vec_length(

static xlog_op_header_t *
xlog_write_setup_ophdr(
- struct xlog *log,
struct xlog_op_header *ophdr,
- struct xlog_ticket *ticket,
- uint flags)
+ struct xlog_ticket *ticket)
{
ophdr->oh_tid = cpu_to_be32(ticket->t_tid);
- ophdr->oh_clientid = ticket->t_clientid;
+ ophdr->oh_clientid = XFS_TRANSACTION;
ophdr->oh_res2 = 0;
-
- /* are we copying a commit or unmount record? */
- ophdr->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 (ophdr->oh_clientid) {
- case XFS_TRANSACTION:
- case XFS_VOLUME:
- case XFS_LOG:
- break;
- default:
- xfs_warn(log->l_mp,
- "Bad XFS transaction clientid 0x%x in ticket "PTR_FMT,
- ophdr->oh_clientid, ticket);
- return NULL;
- }
-
+ ophdr->oh_flags = 0;
return ophdr;
}

@@ -2439,11 +2414,7 @@ xlog_write(
if (index)
optype &= ~XLOG_START_TRANS;
} else {
- ophdr = xlog_write_setup_ophdr(log, ptr,
- ticket, optype);
- if (!ophdr)
- return -EIO;
-
+ ophdr = xlog_write_setup_ophdr(ptr, ticket);
xlog_write_adv_cnt(&ptr, &len, &log_offset,
sizeof(struct xlog_op_header));
added_ophdr = true;
@@ -3499,7 +3470,6 @@ xlog_ticket_alloc(
struct xlog *log,
int unit_bytes,
int cnt,
- char client,
bool permanent)
{
struct xlog_ticket *tic;
@@ -3517,7 +3487,6 @@ xlog_ticket_alloc(
tic->t_cnt = cnt;
tic->t_ocnt = cnt;
tic->t_tid = prandom_u32();
- tic->t_clientid = client;
if (permanent)
tic->t_flags |= XLOG_TIC_PERM_RESERV;

diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h
index 1bd080ce3a95..c0c3141944ea 100644
--- a/fs/xfs/xfs_log.h
+++ b/fs/xfs/xfs_log.h
@@ -117,16 +117,12 @@ int xfs_log_mount_finish(struct xfs_mount *mp);
void xfs_log_mount_cancel(struct xfs_mount *);
xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
-void xfs_log_space_wake(struct xfs_mount *mp);
-int xfs_log_reserve(struct xfs_mount *mp,
- int length,
- int count,
- struct xlog_ticket **ticket,
- uint8_t clientid,
- bool permanent);
-int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
-void xfs_log_unmount(struct xfs_mount *mp);
-int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
+void xfs_log_space_wake(struct xfs_mount *mp);
+int xfs_log_reserve(struct xfs_mount *mp, int length, int count,
+ struct xlog_ticket **ticket, bool permanent);
+int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
+void xfs_log_unmount(struct xfs_mount *mp);
+int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
bool xfs_log_writable(struct xfs_mount *mp);

struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index e9da074ecd69..0c81c13e2cf6 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -37,7 +37,7 @@ xlog_cil_ticket_alloc(
{
struct xlog_ticket *tic;

- tic = xlog_ticket_alloc(log, 0, 1, XFS_TRANSACTION, 0);
+ tic = xlog_ticket_alloc(log, 0, 1, 0);

/*
* set the current reservation to zero so we know to steal the basic
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index bb5fa6b71114..7f601c1c9f45 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -158,7 +158,6 @@ typedef struct xlog_ticket {
int t_unit_res; /* unit reservation in bytes : 4 */
char t_ocnt; /* original count : 1 */
char t_cnt; /* current count : 1 */
- char t_clientid; /* who does this belong to; : 1 */
char t_flags; /* properties of reservation : 1 */

/* reservation array fields */
@@ -465,13 +464,8 @@ extern __le32 xlog_cksum(struct xlog *log, struct xlog_rec_header *rhead,
char *dp, int size);

extern kmem_zone_t *xfs_log_ticket_zone;
-struct xlog_ticket *
-xlog_ticket_alloc(
- struct xlog *log,
- int unit_bytes,
- int count,
- char client,
- bool permanent);
+struct xlog_ticket *xlog_ticket_alloc(struct xlog *log, int unit_bytes,
+ int count, bool permanent);

static inline void
xlog_write_adv_cnt(void **ptr, int *len, int *off, size_t bytes)
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 52f3fdf1e0de..83c2b7f22eb7 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -194,11 +194,9 @@ xfs_trans_reserve(
ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
error = xfs_log_regrant(mp, tp->t_ticket);
} else {
- error = xfs_log_reserve(mp,
- resp->tr_logres,
+ error = xfs_log_reserve(mp, resp->tr_logres,
resp->tr_logcount,
- &tp->t_ticket, XFS_TRANSACTION,
- permanent);
+ &tp->t_ticket, permanent);
}

if (error)
--
2.28.0