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| author | Dave Chinner <dchinner@redhat.com> | 2022-04-21 03:34:04 +0300 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2022-04-21 03:34:04 +0300 |
| commit | ffa04c1f2cb047d6a44c3570bfb6e1ca5ba7f489 (patch) | |
| tree | a9f1340cfe8d5995a6345f0fec3197c2ae5c786e /fs/xfs/xfs_log.c | |
| parent | 6eaed95e21a0872692246e63cb45542d0f62c922 (diff) | |
| download | linux-ffa04c1f2cb047d6a44c3570bfb6e1ca5ba7f489.tar.xz | |
xfs: embed the xlog_op_header in the unmount record
Remove another case where xlog_write() has to prepend an opheader to
a log transaction. The unmount record + ophdr is smaller than the
minimum amount of space guaranteed to be free in an iclog (2 *
sizeof(ophdr)) and so we don't have to care about an unmount record
being split across 2 iclogs.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Chandan Babu R <chandan.babu@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_log.c')
| -rw-r--r-- | fs/xfs/xfs_log.c | 39 |
1 files changed, 28 insertions, 11 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index f6fa5426278b..00e9af9b246a 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -901,12 +901,22 @@ xlog_write_unmount_record( struct xlog *log, struct xlog_ticket *ticket) { - struct xfs_unmount_log_format ulf = { - .magic = XLOG_UNMOUNT_TYPE, + struct { + struct xlog_op_header ophdr; + struct xfs_unmount_log_format ulf; + } unmount_rec = { + .ophdr = { + .oh_clientid = XFS_LOG, + .oh_tid = cpu_to_be32(ticket->t_tid), + .oh_flags = XLOG_UNMOUNT_TRANS, + }, + .ulf = { + .magic = XLOG_UNMOUNT_TYPE, + }, }; struct xfs_log_iovec reg = { - .i_addr = &ulf, - .i_len = sizeof(ulf), + .i_addr = &unmount_rec, + .i_len = sizeof(unmount_rec), .i_type = XLOG_REG_TYPE_UNMOUNT, }; struct xfs_log_vec vec = { @@ -914,8 +924,12 @@ xlog_write_unmount_record( .lv_iovecp = ®, }; + BUILD_BUG_ON((sizeof(struct xlog_op_header) + + sizeof(struct xfs_unmount_log_format)) != + sizeof(unmount_rec)); + /* account for space used by record data */ - ticket->t_curr_res -= sizeof(ulf); + ticket->t_curr_res -= sizeof(unmount_rec); return xlog_write(log, NULL, &vec, ticket, XLOG_UNMOUNT_TRANS); } @@ -2253,6 +2267,8 @@ xlog_write_calc_vec_length( /* Don't account for regions with embedded ophdrs */ if (optype && headers > 0) { + if (optype & XLOG_UNMOUNT_TRANS) + headers--; if (optype & XLOG_START_TRANS) { ASSERT(headers >= 2); headers -= 2; @@ -2458,12 +2474,11 @@ xlog_write( /* * If this is a commit or unmount transaction, we don't need a start - * record to be written. We do, however, have to account for the - * commit or unmount header that gets written. Hence we always have - * to account for an extra xlog_op_header here for commit and unmount - * records. + * record to be written. We do, however, have to account for the commit + * header that gets written. Hence we always have to account for an + * extra xlog_op_header here for commit records. */ - if (optype & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS)) + if (optype & XLOG_COMMIT_TRANS) ticket->t_curr_res -= sizeof(struct xlog_op_header); if (ticket->t_curr_res < 0) { xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, @@ -2527,6 +2542,8 @@ xlog_write( ophdr = reg->i_addr; if (index) optype &= ~XLOG_START_TRANS; + } else if (optype & XLOG_UNMOUNT_TRANS) { + ophdr = reg->i_addr; } else { ophdr = xlog_write_setup_ophdr(log, ptr, ticket, optype); @@ -2557,7 +2574,7 @@ xlog_write( /* * Copy region. * - * Commit and unmount records just log an opheader, so + * Commit records just log an opheader, so * we can have empty payloads with no data region to * copy. Hence we only copy the payload if the vector * says it has data to copy. |