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xfs: kill xfs_iomap

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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
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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,