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xfs: refactor unmount record write

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Refactor the writing of the unmount record into a separate helper.  No
functionality changes.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2018-07-20 09:28:39 -07:00
parent 2e9e6481e2
commit 53235f2215
2 changed files with 82 additions and 62 deletions
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13
fs/xfs/libxfs/xfs_log_format.h
View File

@ -77,6 +77,19 @@ static inline uint xlog_get_cycle(char *ptr)
#define XLOG_UNMOUNT_TYPE 0x556e /* Un for Unmount */
/*
* Log item for unmount records.
*
* The 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; see xfs_log_unmount_write.
*/
struct xfs_unmount_log_format {
uint16_t magic; /* XLOG_UNMOUNT_TYPE */
uint16_t pad1;
uint32_t pad2; /* may as well make it 64 bits */
};
/* Region types for iovec's i_type */
#define XLOG_REG_TYPE_BFORMAT 1
#define XLOG_REG_TYPE_BCHUNK 2

131
fs/xfs/xfs_log.c
View File

@ -826,6 +826,74 @@ xfs_log_mount_cancel(
* deallocation must not be done until source-end.
*/
/* Actually write the unmount record to disk. */
static void
xfs_log_write_unmount_record(
struct xfs_mount *mp)
{
/* the data section must be 32 bit size aligned */
struct xfs_unmount_log_format magic = {
.magic = XLOG_UNMOUNT_TYPE,
};
struct xfs_log_iovec reg = {
.i_addr = &magic,
.i_len = sizeof(magic),
.i_type = XLOG_REG_TYPE_UNMOUNT,
};
struct xfs_log_vec vec = {
.lv_niovecs = 1,
.lv_iovecp = &reg,
};
struct xlog *log = mp->m_log;
struct xlog_in_core *iclog;
struct xlog_ticket *tic = NULL;
xfs_lsn_t lsn;
int error;
error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0);
if (error)
goto out_err;
/* remove inited flag, and account for space used */
tic->t_flags = 0;
tic->t_curr_res -= sizeof(magic);
error = xlog_write(log, &vec, 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...
*/
out_err:
if (error)
xfs_alert(mp, "%s: unmount record failed", __func__);
spin_lock(&log->l_icloglock);
iclog = log->l_iclog;
atomic_inc(&iclog->ic_refcnt);
xlog_state_want_sync(log, iclog);
spin_unlock(&log->l_icloglock);
error = xlog_state_release_iclog(log, iclog);
spin_lock(&log->l_icloglock);
switch (iclog->ic_state) {
default:
if (!XLOG_FORCED_SHUTDOWN(log)) {
xlog_wait(&iclog->ic_force_wait, &log->l_icloglock);
break;
}
/* fall through */
case XLOG_STATE_ACTIVE:
case XLOG_STATE_DIRTY:
spin_unlock(&log->l_icloglock);
break;
}
if (tic) {
trace_xfs_log_umount_write(log, tic);
xlog_ungrant_log_space(log, tic);
xfs_log_ticket_put(tic);
}
}
/*
* Unmount record used to have a string "Unmount filesystem--" in the
* data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE).
@ -842,8 +910,6 @@ xfs_log_unmount_write(xfs_mount_t *mp)
#ifdef DEBUG
xlog_in_core_t *first_iclog;
#endif
xlog_ticket_t *tic = NULL;
xfs_lsn_t lsn;
int error;
/*
@ -870,66 +936,7 @@ xfs_log_unmount_write(xfs_mount_t *mp)
} while (iclog != first_iclog);
#endif
if (! (XLOG_FORCED_SHUTDOWN(log))) {
error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0);
if (!error) {
/* 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 = {
.magic = XLOG_UNMOUNT_TYPE,
};
struct xfs_log_iovec reg = {
.i_addr = &magic,
.i_len = sizeof(magic),
.i_type = XLOG_REG_TYPE_UNMOUNT,
};
struct xfs_log_vec vec = {
.lv_niovecs = 1,
.lv_iovecp = &reg,
};
/* remove inited flag, and account for space used */
tic->t_flags = 0;
tic->t_curr_res -= sizeof(magic);
error = xlog_write(log, &vec, 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_alert(mp, "%s: unmount record failed", __func__);
spin_lock(&log->l_icloglock);
iclog = log->l_iclog;
atomic_inc(&iclog->ic_refcnt);
xlog_state_want_sync(log, iclog);
spin_unlock(&log->l_icloglock);
error = xlog_state_release_iclog(log, iclog);
spin_lock(&log->l_icloglock);
if (!(iclog->ic_state == XLOG_STATE_ACTIVE ||
iclog->ic_state == XLOG_STATE_DIRTY)) {
if (!XLOG_FORCED_SHUTDOWN(log)) {
xlog_wait(&iclog->ic_force_wait,
&log->l_icloglock);
} else {
spin_unlock(&log->l_icloglock);
}
} else {
spin_unlock(&log->l_icloglock);
}
if (tic) {
trace_xfs_log_umount_write(log, tic);
xlog_ungrant_log_space(log, tic);
xfs_log_ticket_put(tic);
}
xfs_log_write_unmount_record(mp);
} else {
/*
* We're already in forced_shutdown mode, couldn't