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xfs: kill xfs_iomap 

Opencode the xfs_iomap code in it's two callers.  The overlap of
passed flags already was minimal and will be further reduced in the
next patch.

As a side effect the BMAPI_* flags for xfs_bmapi and the IO_* flags
for I/O end processing are merged into a single set of flags, which
should be a bit more descriptive of the operation we perform.

Also improve the tracing by giving each caller it's own type set of
tracepoints.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2010-12-10 08:42:20 +00:00 committed by Alex Elder
parent 405f804294
commit a206c817c8
5 changed files with 191 additions and 213 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

211
fs/xfs/linux-2.6/xfs_aops.c
View File

@ -38,15 +38,6 @@
#include <linux/pagevec.h>
#include <linux/writeback.h>
/*
* Types of I/O for bmap clustering and I/O completion tracking.
*/
enum {
IO_READ, /* mapping for a read */
IO_DELAY, /* mapping covers delalloc region */
IO_UNWRITTEN, /* mapping covers allocated but uninitialized data */
IO_NEW /* just allocated */
};
/*
* Prime number of hash buckets since address is used as the key.
@ -182,9 +173,6 @@ xfs_setfilesize(
xfs_inode_t *ip = XFS_I(ioend->io_inode);
xfs_fsize_t isize;
ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG);
ASSERT(ioend->io_type != IO_READ);
if (unlikely(ioend->io_error))
return 0;
@ -244,10 +232,8 @@ xfs_end_io(
* We might have to update the on-disk file size after extending
* writes.
*/
if (ioend->io_type != IO_READ) {
error = xfs_setfilesize(ioend);
ASSERT(!error || error == EAGAIN);
}
error = xfs_setfilesize(ioend);
ASSERT(!error || error == EAGAIN);
/*
* If we didn't complete processing of the ioend, requeue it to the
@ -320,12 +306,88 @@ xfs_map_blocks(
loff_t offset,
ssize_t count,
struct xfs_bmbt_irec *imap,
int flags)
int type,
int nonblocking)
{
int nmaps = 1;
int new = 0;
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
xfs_fileoff_t offset_fsb, end_fsb;
int error = 0;
int lockmode = 0;
int bmapi_flags = XFS_BMAPI_ENTIRE;
int nimaps = 1;
return -xfs_iomap(XFS_I(inode), offset, count, flags, imap, &nmaps, &new);
if (XFS_FORCED_SHUTDOWN(mp))
return -XFS_ERROR(EIO);
switch (type) {
case IO_OVERWRITE:
lockmode = xfs_ilock_map_shared(ip);
break;
case IO_UNWRITTEN:
lockmode = XFS_ILOCK_EXCL;
bmapi_flags |= XFS_BMAPI_IGSTATE;
xfs_ilock(ip, lockmode);
break;
case IO_DELALLOC:
lockmode = XFS_ILOCK_SHARED;
if (!xfs_ilock_nowait(ip, lockmode)) {
if (nonblocking)
return -XFS_ERROR(EAGAIN);
xfs_ilock(ip, lockmode);
}
break;
}
ASSERT(offset <= mp->m_maxioffset);
if (offset + count > mp->m_maxioffset)
count = mp->m_maxioffset - offset;
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
offset_fsb = XFS_B_TO_FSBT(mp, offset);
error = xfs_bmapi(NULL, ip, offset_fsb, end_fsb - offset_fsb,
bmapi_flags, NULL, 0, imap, &nimaps, NULL);
if (error)
goto out;
switch (type) {
case IO_UNWRITTEN:
/* If we found an extent, return it */
if (nimaps &&
(imap->br_startblock != HOLESTARTBLOCK) &&
(imap->br_startblock != DELAYSTARTBLOCK)) {
trace_xfs_map_blocks_found(ip, offset, count, type, imap);
break;
}
error = xfs_iomap_write_delay(ip, offset, count, imap);
if (!error)
trace_xfs_map_blocks_alloc(ip, offset, count, type, imap);
break;
case IO_DELALLOC:
/* If we found an extent, return it */
xfs_iunlock(ip, lockmode);
lockmode = 0;
if (nimaps && !isnullstartblock(imap->br_startblock)) {
trace_xfs_map_blocks_found(ip, offset, count, type, imap);
break;
}
error = xfs_iomap_write_allocate(ip, offset, count, imap);
if (!error)
trace_xfs_map_blocks_alloc(ip, offset, count, type, imap);
break;
default:
if (nimaps)
trace_xfs_map_blocks_found(ip, offset, count, type, imap);
}
out:
if (lockmode)
xfs_iunlock(ip, lockmode);
return -XFS_ERROR(error);
}
STATIC int
@ -722,9 +784,9 @@ xfs_is_delayed_page(
if (buffer_unwritten(bh))
acceptable = (type == IO_UNWRITTEN);
else if (buffer_delay(bh))
acceptable = (type == IO_DELAY);
acceptable = (type == IO_DELALLOC);
else if (buffer_dirty(bh) && buffer_mapped(bh))
acceptable = (type == IO_NEW);
acceptable = (type == IO_OVERWRITE);
else
break;
} while ((bh = bh->b_this_page) != head);
@ -809,7 +871,7 @@ xfs_convert_page(
if (buffer_unwritten(bh))
type = IO_UNWRITTEN;
else
type = IO_DELAY;
type = IO_DELALLOC;
if (!xfs_imap_valid(inode, imap, offset)) {
done = 1;
@ -826,7 +888,7 @@ xfs_convert_page(
page_dirty--;
count++;
} else {
type = IO_NEW;
type = IO_OVERWRITE;
if (buffer_mapped(bh) && all_bh) {
lock_buffer(bh);
xfs_add_to_ioend(inode, bh, offset,
@ -926,7 +988,7 @@ xfs_aops_discard_page(
struct buffer_head *bh, *head;
loff_t offset = page_offset(page);
if (!xfs_is_delayed_page(page, IO_DELAY))
if (!xfs_is_delayed_page(page, IO_DELALLOC))
goto out_invalidate;
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
@ -994,9 +1056,10 @@ xfs_vm_writepage(
__uint64_t end_offset;
pgoff_t end_index, last_index;
ssize_t size, len;
int flags, err, imap_valid = 0, uptodate = 1;
int err, imap_valid = 0, uptodate = 1;
int count = 0;
int all_bh = 0;
int nonblocking = 0;
trace_xfs_writepage(inode, page, 0);
@ -1047,8 +1110,10 @@ xfs_vm_writepage(
bh = head = page_buffers(page);
offset = page_offset(page);
flags = BMAPI_READ;
type = IO_NEW;
type = IO_OVERWRITE;
if (wbc->sync_mode == WB_SYNC_NONE && wbc->nonblocking)
nonblocking = 1;
do {
int new_ioend = 0;
@ -1078,16 +1143,11 @@ xfs_vm_writepage(
type = IO_UNWRITTEN;
imap_valid = 0;
}
flags = BMAPI_WRITE | BMAPI_IGNSTATE;
} else if (buffer_delay(bh)) {
if (type != IO_DELAY) {
type = IO_DELAY;
if (type != IO_DELALLOC) {
type = IO_DELALLOC;
imap_valid = 0;
}
flags = BMAPI_ALLOCATE;
if (wbc->sync_mode == WB_SYNC_NONE)
flags |= BMAPI_TRYLOCK;
}
if (!imap_valid) {
@ -1100,8 +1160,8 @@ xfs_vm_writepage(
* for unwritten extent conversion.
*/
new_ioend = 1;
err = xfs_map_blocks(inode, offset, len,
&imap, flags);
err = xfs_map_blocks(inode, offset, len, &imap,
type, nonblocking);
if (err)
goto error;
imap_valid = xfs_imap_valid(inode, &imap,
@ -1119,30 +1179,21 @@ xfs_vm_writepage(
* That means it must already have extents allocated
* underneath it. Map the extent by reading it.
*/
if (flags != BMAPI_READ) {
flags = BMAPI_READ;
if (type != IO_OVERWRITE) {
type = IO_OVERWRITE;
imap_valid = 0;
}
if (!imap_valid) {
new_ioend = 1;
size = xfs_probe_cluster(inode, page, bh, head);
err = xfs_map_blocks(inode, offset, size,
&imap, flags);
&imap, type, nonblocking);
if (err)
goto error;
imap_valid = xfs_imap_valid(inode, &imap,
offset);
}
/*
* We set the type to IO_NEW in case we are doing a
* small write at EOF that is extending the file but
* without needing an allocation. We need to update the
* file size on I/O completion in this case so it is
* the same case as having just allocated a new extent
* that we are writing into for the first time.
*/
type = IO_NEW;
if (imap_valid) {
all_bh = 1;
lock_buffer(bh);
@ -1250,13 +1301,19 @@ __xfs_get_blocks(
int create,
int direct)
{
int flags = create ? BMAPI_WRITE : BMAPI_READ;
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
xfs_fileoff_t offset_fsb, end_fsb;
int error = 0;
int lockmode = 0;
struct xfs_bmbt_irec imap;
int nimaps = 1;
xfs_off_t offset;
ssize_t size;
int nimap = 1;
int new = 0;
int error;
if (XFS_FORCED_SHUTDOWN(mp))
return -XFS_ERROR(EIO);
offset = (xfs_off_t)iblock << inode->i_blkbits;
ASSERT(bh_result->b_size >= (1 << inode->i_blkbits));
@ -1265,15 +1322,45 @@ __xfs_get_blocks(
if (!create && direct && offset >= i_size_read(inode))
return 0;
if (direct && create)
flags |= BMAPI_DIRECT;
if (create) {
lockmode = XFS_ILOCK_EXCL;
xfs_ilock(ip, lockmode);
} else {
lockmode = xfs_ilock_map_shared(ip);
}
error = xfs_iomap(XFS_I(inode), offset, size, flags, &imap, &nimap,
&new);
ASSERT(offset <= mp->m_maxioffset);
if (offset + size > mp->m_maxioffset)
size = mp->m_maxioffset - offset;
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size);
offset_fsb = XFS_B_TO_FSBT(mp, offset);
error = xfs_bmapi(NULL, ip, offset_fsb, end_fsb - offset_fsb,
XFS_BMAPI_ENTIRE, NULL, 0, &imap, &nimaps, NULL);
if (error)
return -error;
if (nimap == 0)
return 0;
goto out_unlock;
if (create &&
(!nimaps ||
(imap.br_startblock == HOLESTARTBLOCK ||
imap.br_startblock == DELAYSTARTBLOCK))) {
if (direct) {
error = xfs_iomap_write_direct(ip, offset, size,
&imap, nimaps);
} else {
error = xfs_iomap_write_delay(ip, offset, size, &imap);
}
if (error)
goto out_unlock;
trace_xfs_get_blocks_alloc(ip, offset, size, 0, &imap);
} else if (nimaps) {
trace_xfs_get_blocks_found(ip, offset, size, 0, &imap);
} else {
trace_xfs_get_blocks_notfound(ip, offset, size);
goto out_unlock;
}
xfs_iunlock(ip, lockmode);
if (imap.br_startblock != HOLESTARTBLOCK &&
imap.br_startblock != DELAYSTARTBLOCK) {
@ -1340,6 +1427,10 @@ __xfs_get_blocks(
}
return 0;
out_unlock:
xfs_iunlock(ip, lockmode);
return -error;
}
int
@ -1427,7 +1518,7 @@ xfs_vm_direct_IO(
ssize_t ret;
if (rw & WRITE) {
iocb->private = xfs_alloc_ioend(inode, IO_NEW);
iocb->private = xfs_alloc_ioend(inode, IO_DIRECT);
ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov,
offset, nr_segs,

16
fs/xfs/linux-2.6/xfs_aops.h
View File

@ -22,6 +22,22 @@ extern struct workqueue_struct *xfsdatad_workqueue;
extern struct workqueue_struct *xfsconvertd_workqueue;
extern mempool_t *xfs_ioend_pool;
/*
* Types of I/O for bmap clustering and I/O completion tracking.
*/
enum {
IO_DIRECT = 0, /* special case for direct I/O ioends */
IO_DELALLOC, /* mapping covers delalloc region */
IO_UNWRITTEN, /* mapping covers allocated but uninitialized data */
IO_OVERWRITE, /* mapping covers already allocated extent */
};
#define XFS_IO_TYPES \
{ 0, "" }, \
{ IO_DELALLOC, "delalloc" }, \
{ IO_UNWRITTEN, "unwritten" }, \
{ IO_OVERWRITE, "overwrite" }
/*
* xfs_ioend struct manages large extent writes for XFS.
* It can manage several multi-page bio's at once.

28
fs/xfs/linux-2.6/xfs_trace.h
View File

@ -935,10 +935,10 @@ DEFINE_PAGE_EVENT(xfs_writepage);
DEFINE_PAGE_EVENT(xfs_releasepage);
DEFINE_PAGE_EVENT(xfs_invalidatepage);
DECLARE_EVENT_CLASS(xfs_iomap_class,
DECLARE_EVENT_CLASS(xfs_imap_class,
TP_PROTO(struct xfs_inode *ip, xfs_off_t offset, ssize_t count,
int flags, struct xfs_bmbt_irec *irec),
TP_ARGS(ip, offset, count, flags, irec),
int type, struct xfs_bmbt_irec *irec),
TP_ARGS(ip, offset, count, type, irec),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(xfs_ino_t, ino)
@ -946,7 +946,7 @@ DECLARE_EVENT_CLASS(xfs_iomap_class,
__field(loff_t, new_size)
__field(loff_t, offset)
__field(size_t, count)
__field(int, flags)
__field(int, type)
__field(xfs_fileoff_t, startoff)
__field(xfs_fsblock_t, startblock)
__field(xfs_filblks_t, blockcount)
@ -958,13 +958,13 @@ DECLARE_EVENT_CLASS(xfs_iomap_class,
__entry->new_size = ip->i_new_size;
__entry->offset = offset;
__entry->count = count;
__entry->flags = flags;
__entry->type = type;
__entry->startoff = irec ? irec->br_startoff : 0;
__entry->startblock = irec ? irec->br_startblock : 0;
__entry->blockcount = irec ? irec->br_blockcount : 0;
),
TP_printk("dev %d:%d ino 0x%llx size 0x%llx new_size 0x%llx "
"offset 0x%llx count %zd flags %s "
"offset 0x%llx count %zd type %s "
"startoff 0x%llx startblock %lld blockcount 0x%llx",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->ino,
@ -972,20 +972,21 @@ DECLARE_EVENT_CLASS(xfs_iomap_class,
__entry->new_size,
__entry->offset,
__entry->count,
__print_flags(__entry->flags, "|", BMAPI_FLAGS),
__print_symbolic(__entry->type, XFS_IO_TYPES),
__entry->startoff,
(__int64_t)__entry->startblock,
__entry->blockcount)
)
#define DEFINE_IOMAP_EVENT(name) \
DEFINE_EVENT(xfs_iomap_class, name, \
DEFINE_EVENT(xfs_imap_class, name, \
TP_PROTO(struct xfs_inode *ip, xfs_off_t offset, ssize_t count, \
int flags, struct xfs_bmbt_irec *irec), \
TP_ARGS(ip, offset, count, flags, irec))
DEFINE_IOMAP_EVENT(xfs_iomap_enter);
DEFINE_IOMAP_EVENT(xfs_iomap_found);
DEFINE_IOMAP_EVENT(xfs_iomap_alloc);
int type, struct xfs_bmbt_irec *irec), \
TP_ARGS(ip, offset, count, type, irec))
DEFINE_IOMAP_EVENT(xfs_map_blocks_found);
DEFINE_IOMAP_EVENT(xfs_map_blocks_alloc);
DEFINE_IOMAP_EVENT(xfs_get_blocks_found);
DEFINE_IOMAP_EVENT(xfs_get_blocks_alloc);
DECLARE_EVENT_CLASS(xfs_simple_io_class,
TP_PROTO(struct xfs_inode *ip, xfs_off_t offset, ssize_t count),
@ -1022,6 +1023,7 @@ DEFINE_EVENT(xfs_simple_io_class, name, \
TP_ARGS(ip, offset, count))
DEFINE_SIMPLE_IO_EVENT(xfs_delalloc_enospc);
DEFINE_SIMPLE_IO_EVENT(xfs_unwritten_convert);
DEFINE_SIMPLE_IO_EVENT(xfs_get_blocks_notfound);
TRACE_EVENT(xfs_itruncate_start,

122
fs/xfs/xfs_iomap.c
View File

@ -47,124 +47,8 @@
#define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
<< mp->m_writeio_log)
#define XFS_STRAT_WRITE_IMAPS 2
#define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
STATIC int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t,
struct xfs_bmbt_irec *, int);
STATIC int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t,
struct xfs_bmbt_irec *);
STATIC int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t,
struct xfs_bmbt_irec *);
int
xfs_iomap(
struct xfs_inode *ip,
xfs_off_t offset,
ssize_t count,
int flags,
struct xfs_bmbt_irec *imap,
int *nimaps,
int *new)
{
struct xfs_mount *mp = ip->i_mount;
xfs_fileoff_t offset_fsb, end_fsb;
int error = 0;
int lockmode = 0;
int bmapi_flags = 0;
ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG);
*new = 0;
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
trace_xfs_iomap_enter(ip, offset, count, flags, NULL);
switch (flags & (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE)) {
case BMAPI_READ:
lockmode = xfs_ilock_map_shared(ip);
bmapi_flags = XFS_BMAPI_ENTIRE;
break;
case BMAPI_WRITE:
lockmode = XFS_ILOCK_EXCL;
if (flags & BMAPI_IGNSTATE)
bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE;
xfs_ilock(ip, lockmode);
break;
case BMAPI_ALLOCATE:
lockmode = XFS_ILOCK_SHARED;
bmapi_flags = XFS_BMAPI_ENTIRE;
/* Attempt non-blocking lock */
if (flags & BMAPI_TRYLOCK) {
if (!xfs_ilock_nowait(ip, lockmode))
return XFS_ERROR(EAGAIN);
} else {
xfs_ilock(ip, lockmode);
}
break;
default:
BUG();
}
ASSERT(offset <= mp->m_maxioffset);
if ((xfs_fsize_t)offset + count > mp->m_maxioffset)
count = mp->m_maxioffset - offset;
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
offset_fsb = XFS_B_TO_FSBT(mp, offset);
error = xfs_bmapi(NULL, ip, offset_fsb,
(xfs_filblks_t)(end_fsb - offset_fsb),
bmapi_flags, NULL, 0, imap,
nimaps, NULL);
if (error)
goto out;
switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)) {
case BMAPI_WRITE:
/* If we found an extent, return it */
if (*nimaps &&
(imap->br_startblock != HOLESTARTBLOCK) &&
(imap->br_startblock != DELAYSTARTBLOCK)) {
trace_xfs_iomap_found(ip, offset, count, flags, imap);
break;
}
if (flags & BMAPI_DIRECT) {
error = xfs_iomap_write_direct(ip, offset, count, imap,
*nimaps);
} else {
error = xfs_iomap_write_delay(ip, offset, count, imap);
}
if (!error) {
trace_xfs_iomap_alloc(ip, offset, count, flags, imap);
}
*new = 1;
break;
case BMAPI_ALLOCATE:
/* If we found an extent, return it */
xfs_iunlock(ip, lockmode);
lockmode = 0;
if (*nimaps && !isnullstartblock(imap->br_startblock)) {
trace_xfs_iomap_found(ip, offset, count, flags, imap);
break;
}
error = xfs_iomap_write_allocate(ip, offset, count, imap);
break;
}
out:
if (lockmode)
xfs_iunlock(ip, lockmode);
return XFS_ERROR(error);
}
STATIC int
xfs_iomap_eof_align_last_fsb(
xfs_mount_t *mp,
@ -233,7 +117,7 @@ xfs_cmn_err_fsblock_zero(
return EFSCORRUPTED;
}
STATIC int
int
xfs_iomap_write_direct(
xfs_inode_t *ip,
xfs_off_t offset,
@ -428,7 +312,7 @@ xfs_iomap_eof_want_preallocate(
return 0;
}
STATIC int
int
xfs_iomap_write_delay(
xfs_inode_t *ip,
xfs_off_t offset,
@ -527,7 +411,7 @@ retry:
* We no longer bother to look at the incoming map - all we have to
* guarantee is that whatever we allocate fills the required range.
*/
STATIC int
int
xfs_iomap_write_allocate(
xfs_inode_t *ip,
xfs_off_t offset,

27
fs/xfs/xfs_iomap.h
View File

@ -18,30 +18,15 @@
#ifndef __XFS_IOMAP_H__
#define __XFS_IOMAP_H__
/* base extent manipulation calls */
#define BMAPI_READ (1 << 0) /* read extents */
#define BMAPI_WRITE (1 << 1) /* create extents */
#define BMAPI_ALLOCATE (1 << 2) /* delayed allocate to real extents */
/* modifiers */
#define BMAPI_IGNSTATE (1 << 4) /* ignore unwritten state on read */
#define BMAPI_DIRECT (1 << 5) /* direct instead of buffered write */
#define BMAPI_MMA (1 << 6) /* allocate for mmap write */
#define BMAPI_TRYLOCK (1 << 7) /* non-blocking request */
#define BMAPI_FLAGS \
{ BMAPI_READ, "READ" }, \
{ BMAPI_WRITE, "WRITE" }, \
{ BMAPI_ALLOCATE, "ALLOCATE" }, \
{ BMAPI_IGNSTATE, "IGNSTATE" }, \
{ BMAPI_DIRECT, "DIRECT" }, \
{ BMAPI_TRYLOCK, "TRYLOCK" }
struct xfs_inode;
struct xfs_bmbt_irec;
extern int xfs_iomap(struct xfs_inode *, xfs_off_t, ssize_t, int,
struct xfs_bmbt_irec *, int *, int *);
extern int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t,
struct xfs_bmbt_irec *, int);
extern int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t,
struct xfs_bmbt_irec *);
extern int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t, size_t,
struct xfs_bmbt_irec *);
extern int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, size_t);
#endif /* __XFS_IOMAP_H__*/