| Message ID | 20211118231352.2051947-12-david@fromorbit.com (mailing list archive) |
|---|---|
| State | Deferred, archived |
| Headers | show |
| Series | xfs: rework xlog_write() | expand |
On 19 Nov 2021 at 04:43, Dave Chinner wrote: > From: Dave Chinner <dchinner@redhat.com> > > Introduce an optimised version of xlog_write() that is used when the > entire write will fit in a single iclog. This greatly simplifies the > implementation of writing a log vector chain into an iclog, and sets > the ground work for a much more understandable xlog_write() > implementation. > > This incorporates some factoring and simplifications proposed by > Christoph Hellwig. > Looks good. Reviewed-by: Chandan Babu R <chandan.babu@oracle.com> > Signed-off-by: Dave Chinner <dchinner@redhat.com> > Reviewed-by: Christoph Hellwig <hch@lst.de> > Reviewed-by: Darrick J. Wong <djwong@kernel.org> > --- > fs/xfs/xfs_log.c | 69 +++++++++++++++++++++++++++++++++++++++++++++--- > 1 file changed, 66 insertions(+), 3 deletions(-) > > diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c > index f26c85dbc765..6d93b2c96262 100644 > --- a/fs/xfs/xfs_log.c > +++ b/fs/xfs/xfs_log.c > @@ -2224,6 +2224,58 @@ xlog_print_trans( > } > } > > +static inline void > +xlog_write_iovec( > + struct xlog_in_core *iclog, > + uint32_t *log_offset, > + void *data, > + uint32_t write_len, > + int *bytes_left, > + uint32_t *record_cnt, > + uint32_t *data_cnt) > +{ > + ASSERT(*log_offset % sizeof(int32_t) == 0); > + ASSERT(write_len % sizeof(int32_t) == 0); > + > + memcpy(iclog->ic_datap + *log_offset, data, write_len); > + *log_offset += write_len; > + *bytes_left -= write_len; > + (*record_cnt)++; > + *data_cnt += write_len; > +} > + > +/* > + * Write log vectors into a single iclog which is guaranteed by the caller > + * to have enough space to write the entire log vector into. > + */ > +static void > +xlog_write_full( > + struct xfs_log_vec *lv, > + struct xlog_ticket *ticket, > + struct xlog_in_core *iclog, > + uint32_t *log_offset, > + uint32_t *len, > + uint32_t *record_cnt, > + uint32_t *data_cnt) > +{ > + int index; > + > + ASSERT(*log_offset + *len <= iclog->ic_size); > + > + /* > + * Ordered log vectors have no regions to write so this > + * loop will naturally skip them. > + */ > + for (index = 0; index < lv->lv_niovecs; index++) { > + struct xfs_log_iovec *reg = &lv->lv_iovecp[index]; > + struct xlog_op_header *ophdr = reg->i_addr; > + > + ophdr->oh_tid = cpu_to_be32(ticket->t_tid); > + xlog_write_iovec(iclog, log_offset, reg->i_addr, > + reg->i_len, len, record_cnt, data_cnt); > + } > +} > + > static xlog_op_header_t * > xlog_write_setup_ophdr( > struct xlog_op_header *ophdr, > @@ -2388,8 +2440,8 @@ xlog_write( > int partial_copy = 0; > int partial_copy_len = 0; > int contwr = 0; > - int record_cnt = 0; > - int data_cnt = 0; > + uint32_t record_cnt = 0; > + uint32_t data_cnt = 0; > int error = 0; > > if (ticket->t_curr_res < 0) { > @@ -2409,7 +2461,6 @@ xlog_write( > return error; > > ASSERT(log_offset <= iclog->ic_size - 1); > - ptr = iclog->ic_datap + log_offset; > > /* > * If we have a context pointer, pass it the first iclog we are > @@ -2421,10 +2472,22 @@ xlog_write( > ctx = NULL; > } > > + /* If this is a single iclog write, go fast... */ > + if (!contwr && lv == log_vector) { > + while (lv) { > + xlog_write_full(lv, ticket, iclog, &log_offset, > + &len, &record_cnt, &data_cnt); > + lv = lv->lv_next; > + } > + data_cnt = 0; > + break; > + } > + > /* > * This loop writes out as many regions as can fit in the amount > * of space which was allocated by xlog_state_get_iclog_space(). > */ > + ptr = iclog->ic_datap + log_offset; > while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { > struct xfs_log_iovec *reg; > struct xlog_op_header *ophdr;
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index f26c85dbc765..6d93b2c96262 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -2224,6 +2224,58 @@ xlog_print_trans( } } +static inline void +xlog_write_iovec( + struct xlog_in_core *iclog, + uint32_t *log_offset, + void *data, + uint32_t write_len, + int *bytes_left, + uint32_t *record_cnt, + uint32_t *data_cnt) +{ + ASSERT(*log_offset % sizeof(int32_t) == 0); + ASSERT(write_len % sizeof(int32_t) == 0); + + memcpy(iclog->ic_datap + *log_offset, data, write_len); + *log_offset += write_len; + *bytes_left -= write_len; + (*record_cnt)++; + *data_cnt += write_len; +} + +/* + * Write log vectors into a single iclog which is guaranteed by the caller + * to have enough space to write the entire log vector into. + */ +static void +xlog_write_full( + struct xfs_log_vec *lv, + struct xlog_ticket *ticket, + struct xlog_in_core *iclog, + uint32_t *log_offset, + uint32_t *len, + uint32_t *record_cnt, + uint32_t *data_cnt) +{ + int index; + + ASSERT(*log_offset + *len <= iclog->ic_size); + + /* + * Ordered log vectors have no regions to write so this + * loop will naturally skip them. + */ + for (index = 0; index < lv->lv_niovecs; index++) { + struct xfs_log_iovec *reg = &lv->lv_iovecp[index]; + struct xlog_op_header *ophdr = reg->i_addr; + + ophdr->oh_tid = cpu_to_be32(ticket->t_tid); + xlog_write_iovec(iclog, log_offset, reg->i_addr, + reg->i_len, len, record_cnt, data_cnt); + } +} + static xlog_op_header_t * xlog_write_setup_ophdr( struct xlog_op_header *ophdr, @@ -2388,8 +2440,8 @@ xlog_write( int partial_copy = 0; int partial_copy_len = 0; int contwr = 0; - int record_cnt = 0; - int data_cnt = 0; + uint32_t record_cnt = 0; + uint32_t data_cnt = 0; int error = 0; if (ticket->t_curr_res < 0) { @@ -2409,7 +2461,6 @@ xlog_write( return error; ASSERT(log_offset <= iclog->ic_size - 1); - ptr = iclog->ic_datap + log_offset; /* * If we have a context pointer, pass it the first iclog we are @@ -2421,10 +2472,22 @@ xlog_write( ctx = NULL; } + /* If this is a single iclog write, go fast... */ + if (!contwr && lv == log_vector) { + while (lv) { + xlog_write_full(lv, ticket, iclog, &log_offset, + &len, &record_cnt, &data_cnt); + lv = lv->lv_next; + } + data_cnt = 0; + break; + } + /* * This loop writes out as many regions as can fit in the amount * of space which was allocated by xlog_state_get_iclog_space(). */ + ptr = iclog->ic_datap + log_offset; while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { struct xfs_log_iovec *reg; struct xlog_op_header *ophdr;