aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs
diff options
context:
space:
mode:
authorDave Chinner <dchinner@redhat.com>2012-04-23 15:58:49 +1000
committerBen Myers <bpm@sgi.com>2012-05-14 16:20:45 -0500
commite70b73f84f474cc594a39bd8ff083974e6d69aea (patch)
tree0d365698ca2b6542aab8ca92c8e1f23b9c43da55 /fs/xfs
parentbf813cdddfb3a5bc88e1612e8f62a12367871213 (diff)
xfs: clean up buffer get/read call API
The xfs_buf_get/read API is not consistent in the units it uses, and does not use appropriate or consistent units/types for the variables. Convert the API to use disk addresses and block counts for all buffer get and read calls. Use consistent naming for all the functions and their declarations, and convert the internal functions to use disk addresses and block counts to avoid need to convert them from one type to another and back again. Fix all the callers to use disk addresses and block counts. In many cases, this removes an additional conversion from the function call as the callers already have a block count. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_buf.c86
-rw-r--r--fs/xfs/xfs_buf.h38
-rw-r--r--fs/xfs/xfs_fsops.c4
-rw-r--r--fs/xfs/xfs_log.c6
-rw-r--r--fs/xfs/xfs_log_recover.c2
-rw-r--r--fs/xfs/xfs_mount.c12
-rw-r--r--fs/xfs/xfs_rtalloc.c8
-rw-r--r--fs/xfs/xfs_vnodeops.c2
8 files changed, 84 insertions, 74 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index f463dce4251..d3a1974c91d 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -172,8 +172,8 @@ xfs_buf_stale(
struct xfs_buf *
xfs_buf_alloc(
struct xfs_buftarg *target,
- xfs_off_t range_base,
- size_t range_length,
+ xfs_daddr_t blkno,
+ size_t numblks,
xfs_buf_flags_t flags)
{
struct xfs_buf *bp;
@@ -196,14 +196,21 @@ xfs_buf_alloc(
sema_init(&bp->b_sema, 0); /* held, no waiters */
XB_SET_OWNER(bp);
bp->b_target = target;
- bp->b_file_offset = range_base;
+ bp->b_file_offset = blkno << BBSHIFT;
/*
* Set buffer_length and count_desired to the same value initially.
* I/O routines should use count_desired, which will be the same in
* most cases but may be reset (e.g. XFS recovery).
*/
- bp->b_buffer_length = bp->b_count_desired = range_length;
+ bp->b_buffer_length = bp->b_count_desired = numblks << BBSHIFT;
bp->b_flags = flags;
+
+ /*
+ * We do not set the block number here in the buffer because we have not
+ * finished initialising the buffer. We insert the buffer into the cache
+ * in this state, so this ensures that we are unable to do IO on a
+ * buffer that hasn't been fully initialised.
+ */
bp->b_bn = XFS_BUF_DADDR_NULL;
atomic_set(&bp->b_pin_count, 0);
init_waitqueue_head(&bp->b_waiters);
@@ -426,29 +433,29 @@ _xfs_buf_map_pages(
*/
xfs_buf_t *
_xfs_buf_find(
- xfs_buftarg_t *btp, /* block device target */
- xfs_off_t ioff, /* starting offset of range */
- size_t isize, /* length of range */
+ struct xfs_buftarg *btp,
+ xfs_daddr_t blkno,
+ size_t numblks,
xfs_buf_flags_t flags,
xfs_buf_t *new_bp)
{
- xfs_off_t range_base;
- size_t range_length;
+ xfs_off_t offset;
+ size_t numbytes;
struct xfs_perag *pag;
struct rb_node **rbp;
struct rb_node *parent;
xfs_buf_t *bp;
- range_base = (ioff << BBSHIFT);
- range_length = (isize << BBSHIFT);
+ offset = BBTOB(blkno);
+ numbytes = BBTOB(numblks);
/* Check for IOs smaller than the sector size / not sector aligned */
- ASSERT(!(range_length < (1 << btp->bt_sshift)));
- ASSERT(!(range_base & (xfs_off_t)btp->bt_smask));
+ ASSERT(!(numbytes < (1 << btp->bt_sshift)));
+ ASSERT(!(offset & (xfs_off_t)btp->bt_smask));
/* get tree root */
pag = xfs_perag_get(btp->bt_mount,
- xfs_daddr_to_agno(btp->bt_mount, ioff));
+ xfs_daddr_to_agno(btp->bt_mount, blkno));
/* walk tree */
spin_lock(&pag->pag_buf_lock);
@@ -459,9 +466,9 @@ _xfs_buf_find(
parent = *rbp;
bp = rb_entry(parent, struct xfs_buf, b_rbnode);
- if (range_base < bp->b_file_offset)
+ if (offset < bp->b_file_offset)
rbp = &(*rbp)->rb_left;
- else if (range_base > bp->b_file_offset)
+ else if (offset > bp->b_file_offset)
rbp = &(*rbp)->rb_right;
else {
/*
@@ -472,7 +479,7 @@ _xfs_buf_find(
* reallocating a busy extent. Skip this buffer and
* continue searching to the right for an exact match.
*/
- if (bp->b_buffer_length != range_length) {
+ if (bp->b_buffer_length != numbytes) {
ASSERT(bp->b_flags & XBF_STALE);
rbp = &(*rbp)->rb_right;
continue;
@@ -532,21 +539,20 @@ found:
*/
struct xfs_buf *
xfs_buf_get(
- xfs_buftarg_t *target,/* target for buffer */
- xfs_off_t ioff, /* starting offset of range */
- size_t isize, /* length of range */
+ xfs_buftarg_t *target,
+ xfs_daddr_t blkno,
+ size_t numblks,
xfs_buf_flags_t flags)
{
struct xfs_buf *bp;
struct xfs_buf *new_bp;
int error = 0;
- bp = _xfs_buf_find(target, ioff, isize, flags, NULL);
+ bp = _xfs_buf_find(target, blkno, numblks, flags, NULL);
if (likely(bp))
goto found;
- new_bp = xfs_buf_alloc(target, ioff << BBSHIFT, isize << BBSHIFT,
- flags);
+ new_bp = xfs_buf_alloc(target, blkno, numblks, flags);
if (unlikely(!new_bp))
return NULL;
@@ -556,7 +562,7 @@ xfs_buf_get(
return NULL;
}
- bp = _xfs_buf_find(target, ioff, isize, flags, new_bp);
+ bp = _xfs_buf_find(target, blkno, numblks, flags, new_bp);
if (!bp) {
xfs_buf_free(new_bp);
return NULL;
@@ -569,7 +575,7 @@ xfs_buf_get(
* Now we have a workable buffer, fill in the block number so
* that we can do IO on it.
*/
- bp->b_bn = ioff;
+ bp->b_bn = blkno;
bp->b_count_desired = bp->b_buffer_length;
found:
@@ -613,15 +619,15 @@ _xfs_buf_read(
xfs_buf_t *
xfs_buf_read(
xfs_buftarg_t *target,
- xfs_off_t ioff,
- size_t isize,
+ xfs_daddr_t blkno,
+ size_t numblks,
xfs_buf_flags_t flags)
{
xfs_buf_t *bp;
flags |= XBF_READ;
- bp = xfs_buf_get(target, ioff, isize, flags);
+ bp = xfs_buf_get(target, blkno, numblks, flags);
if (bp) {
trace_xfs_buf_read(bp, flags, _RET_IP_);
@@ -656,13 +662,13 @@ xfs_buf_read(
void
xfs_buf_readahead(
xfs_buftarg_t *target,
- xfs_off_t ioff,
- size_t isize)
+ xfs_daddr_t blkno,
+ size_t numblks)
{
if (bdi_read_congested(target->bt_bdi))
return;
- xfs_buf_read(target, ioff, isize,
+ xfs_buf_read(target, blkno, numblks,
XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD|XBF_DONT_BLOCK);
}
@@ -672,16 +678,15 @@ xfs_buf_readahead(
*/
struct xfs_buf *
xfs_buf_read_uncached(
- struct xfs_mount *mp,
struct xfs_buftarg *target,
xfs_daddr_t daddr,
- size_t length,
+ size_t numblks,
int flags)
{
xfs_buf_t *bp;
int error;
- bp = xfs_buf_get_uncached(target, length, flags);
+ bp = xfs_buf_get_uncached(target, numblks, flags);
if (!bp)
return NULL;
@@ -689,7 +694,7 @@ xfs_buf_read_uncached(
XFS_BUF_SET_ADDR(bp, daddr);
XFS_BUF_READ(bp);
- xfsbdstrat(mp, bp);
+ xfsbdstrat(target->bt_mount, bp);
error = xfs_buf_iowait(bp);
if (error) {
xfs_buf_relse(bp);
@@ -705,7 +710,7 @@ xfs_buf_read_uncached(
void
xfs_buf_set_empty(
struct xfs_buf *bp,
- size_t len)
+ size_t numblks)
{
if (bp->b_pages)
_xfs_buf_free_pages(bp);
@@ -714,7 +719,7 @@ xfs_buf_set_empty(
bp->b_page_count = 0;
bp->b_addr = NULL;
bp->b_file_offset = 0;
- bp->b_buffer_length = bp->b_count_desired = len;
+ bp->b_buffer_length = bp->b_count_desired = numblks << BBSHIFT;
bp->b_bn = XFS_BUF_DADDR_NULL;
bp->b_flags &= ~XBF_MAPPED;
}
@@ -776,17 +781,18 @@ xfs_buf_associate_memory(
xfs_buf_t *
xfs_buf_get_uncached(
struct xfs_buftarg *target,
- size_t len,
+ size_t numblks,
int flags)
{
- unsigned long page_count = PAGE_ALIGN(len) >> PAGE_SHIFT;
+ unsigned long page_count;
int error, i;
xfs_buf_t *bp;
- bp = xfs_buf_alloc(target, 0, len, 0);
+ bp = xfs_buf_alloc(target, 0, numblks, 0);
if (unlikely(bp == NULL))
goto fail;
+ page_count = PAGE_ALIGN(numblks << BBSHIFT) >> PAGE_SHIFT;
error = _xfs_buf_get_pages(bp, page_count, 0);
if (error)
goto fail_free_buf;
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 87a474853f8..ffd6da045d2 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -150,26 +150,30 @@ typedef struct xfs_buf {
/* Finding and Reading Buffers */
-extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t,
- xfs_buf_flags_t, xfs_buf_t *);
+struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target, xfs_daddr_t blkno,
+ size_t numblks, xfs_buf_flags_t flags,
+ struct xfs_buf *new_bp);
#define xfs_incore(buftarg,blkno,len,lockit) \
_xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
-extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t,
- xfs_buf_flags_t);
-extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t,
- xfs_buf_flags_t);
-
-struct xfs_buf *xfs_buf_alloc(struct xfs_buftarg *, xfs_off_t, size_t,
- xfs_buf_flags_t);
-extern void xfs_buf_set_empty(struct xfs_buf *bp, size_t len);
-extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int);
-extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
-extern void xfs_buf_hold(xfs_buf_t *);
-extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t);
-struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp,
- struct xfs_buftarg *target,
- xfs_daddr_t daddr, size_t length, int flags);
+struct xfs_buf *xfs_buf_get(struct xfs_buftarg *target, xfs_daddr_t blkno,
+ size_t numblks, xfs_buf_flags_t flags);
+struct xfs_buf *xfs_buf_read(struct xfs_buftarg *target, xfs_daddr_t blkno,
+ size_t numblks, xfs_buf_flags_t flags);
+void xfs_buf_readahead(struct xfs_buftarg *target, xfs_daddr_t blkno,
+ size_t numblks);
+
+struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks);
+struct xfs_buf *xfs_buf_alloc(struct xfs_buftarg *target, xfs_daddr_t blkno,
+ size_t numblks, xfs_buf_flags_t flags);
+void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks);
+int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length);
+
+struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks,
+ int flags);
+struct xfs_buf *xfs_buf_read_uncached(struct xfs_buftarg *target,
+ xfs_daddr_t daddr, size_t numblks, int flags);
+void xfs_buf_hold(struct xfs_buf *bp);
/* Releasing Buffers */
extern void xfs_buf_free(xfs_buf_t *);
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 1c6fdeb702f..019ba5c52a4 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -147,9 +147,9 @@ xfs_growfs_data_private(
if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
return error;
dpct = pct - mp->m_sb.sb_imax_pct;
- bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
+ bp = xfs_buf_read_uncached(mp->m_ddev_targp,
XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
- BBTOB(XFS_FSS_TO_BB(mp, 1)), 0);
+ XFS_FSS_TO_BB(mp, 1), 0);
if (!bp)
return EIO;
xfs_buf_relse(bp);
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 418d5d7bc52..89900129a4a 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -1187,7 +1187,7 @@ xlog_alloc_log(xfs_mount_t *mp,
xlog_get_iclog_buffer_size(mp, log);
error = ENOMEM;
- bp = xfs_buf_alloc(mp->m_logdev_targp, 0, log->l_iclog_size, 0);
+ bp = xfs_buf_alloc(mp->m_logdev_targp, 0, BTOBB(log->l_iclog_size), 0);
if (!bp)
goto out_free_log;
bp->b_iodone = xlog_iodone;
@@ -1219,7 +1219,7 @@ xlog_alloc_log(xfs_mount_t *mp,
prev_iclog = iclog;
bp = xfs_buf_get_uncached(mp->m_logdev_targp,
- log->l_iclog_size, 0);
+ BTOBB(log->l_iclog_size), 0);
if (!bp)
goto out_free_iclog;
@@ -1588,7 +1588,7 @@ xlog_dealloc_log(xlog_t *log)
* always need to ensure that the extra buffer does not point to memory
* owned by another log buffer before we free it.
*/
- xfs_buf_set_empty(log->l_xbuf, log->l_iclog_size);
+ xfs_buf_set_empty(log->l_xbuf, BTOBB(log->l_iclog_size));
xfs_buf_free(log->l_xbuf);
iclog = log->l_iclog;
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index e1577e763fd..8a2165c5610 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -120,7 +120,7 @@ xlog_get_bp(
nbblks += log->l_sectBBsize;
nbblks = round_up(nbblks, log->l_sectBBsize);
- bp = xfs_buf_get_uncached(log->l_mp->m_logdev_targp, BBTOB(nbblks), 0);
+ bp = xfs_buf_get_uncached(log->l_mp->m_logdev_targp, nbblks, 0);
if (bp)
xfs_buf_unlock(bp);
return bp;
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 385a3b11d3d..89be5ff5790 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -684,8 +684,8 @@ xfs_readsb(xfs_mount_t *mp, int flags)
sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
reread:
- bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
- XFS_SB_DADDR, sector_size, 0);
+ bp = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
+ BTOBB(sector_size), 0);
if (!bp) {
if (loud)
xfs_warn(mp, "SB buffer read failed");
@@ -1033,9 +1033,9 @@ xfs_check_sizes(xfs_mount_t *mp)
xfs_warn(mp, "filesystem size mismatch detected");
return XFS_ERROR(EFBIG);
}
- bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
+ bp = xfs_buf_read_uncached(mp->m_ddev_targp,
d - XFS_FSS_TO_BB(mp, 1),
- BBTOB(XFS_FSS_TO_BB(mp, 1)), 0);
+ XFS_FSS_TO_BB(mp, 1), 0);
if (!bp) {
xfs_warn(mp, "last sector read failed");
return EIO;
@@ -1048,9 +1048,9 @@ xfs_check_sizes(xfs_mount_t *mp)
xfs_warn(mp, "log size mismatch detected");
return XFS_ERROR(EFBIG);
}
- bp = xfs_buf_read_uncached(mp, mp->m_logdev_targp,
+ bp = xfs_buf_read_uncached(mp->m_logdev_targp,
d - XFS_FSB_TO_BB(mp, 1),
- XFS_FSB_TO_B(mp, 1), 0);
+ XFS_FSB_TO_BB(mp, 1), 0);
if (!bp) {
xfs_warn(mp, "log device read failed");
return EIO;
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index ca4f31534a0..7434d3fd483 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1872,9 +1872,9 @@ xfs_growfs_rt(
/*
* Read in the last block of the device, make sure it exists.
*/
- bp = xfs_buf_read_uncached(mp, mp->m_rtdev_targp,
+ bp = xfs_buf_read_uncached(mp->m_rtdev_targp,
XFS_FSB_TO_BB(mp, nrblocks - 1),
- XFS_FSB_TO_B(mp, 1), 0);
+ XFS_FSB_TO_BB(mp, 1), 0);
if (!bp)
return EIO;
xfs_buf_relse(bp);
@@ -2219,9 +2219,9 @@ xfs_rtmount_init(
(unsigned long long) mp->m_sb.sb_rblocks);
return XFS_ERROR(EFBIG);
}
- bp = xfs_buf_read_uncached(mp, mp->m_rtdev_targp,
+ bp = xfs_buf_read_uncached(mp->m_rtdev_targp,
d - XFS_FSB_TO_BB(mp, 1),
- XFS_FSB_TO_B(mp, 1), 0);
+ XFS_FSB_TO_BB(mp, 1), 0);
if (!bp) {
xfs_warn(mp, "realtime device size check failed");
return EIO;
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 64981d7e737..445c224742b 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -1966,7 +1966,7 @@ xfs_zero_remaining_bytes(
bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
mp->m_rtdev_targp : mp->m_ddev_targp,
- mp->m_sb.sb_blocksize, XBF_DONT_BLOCK);
+ BTOBB(mp->m_sb.sb_blocksize), XBF_DONT_BLOCK);
if (!bp)
return XFS_ERROR(ENOMEM);