6d4a8ecb34
The "cmn_err" part of the function name is no longer relevant. Rename the function to xfs_alert_fsblock_zero() to match the new logging API. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Alex Elder <aelder@sgi.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
748 lines
20 KiB
C
748 lines
20 KiB
C
/*
|
|
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "xfs.h"
|
|
#include "xfs_fs.h"
|
|
#include "xfs_bit.h"
|
|
#include "xfs_log.h"
|
|
#include "xfs_inum.h"
|
|
#include "xfs_trans.h"
|
|
#include "xfs_sb.h"
|
|
#include "xfs_ag.h"
|
|
#include "xfs_alloc.h"
|
|
#include "xfs_quota.h"
|
|
#include "xfs_mount.h"
|
|
#include "xfs_bmap_btree.h"
|
|
#include "xfs_alloc_btree.h"
|
|
#include "xfs_ialloc_btree.h"
|
|
#include "xfs_dinode.h"
|
|
#include "xfs_inode.h"
|
|
#include "xfs_btree.h"
|
|
#include "xfs_bmap.h"
|
|
#include "xfs_rtalloc.h"
|
|
#include "xfs_error.h"
|
|
#include "xfs_itable.h"
|
|
#include "xfs_rw.h"
|
|
#include "xfs_attr.h"
|
|
#include "xfs_buf_item.h"
|
|
#include "xfs_trans_space.h"
|
|
#include "xfs_utils.h"
|
|
#include "xfs_iomap.h"
|
|
#include "xfs_trace.h"
|
|
|
|
|
|
#define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
|
|
<< mp->m_writeio_log)
|
|
#define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
|
|
|
|
STATIC int
|
|
xfs_iomap_eof_align_last_fsb(
|
|
xfs_mount_t *mp,
|
|
xfs_inode_t *ip,
|
|
xfs_extlen_t extsize,
|
|
xfs_fileoff_t *last_fsb)
|
|
{
|
|
xfs_fileoff_t new_last_fsb = 0;
|
|
xfs_extlen_t align;
|
|
int eof, error;
|
|
|
|
if (XFS_IS_REALTIME_INODE(ip))
|
|
;
|
|
/*
|
|
* If mounted with the "-o swalloc" option, roundup the allocation
|
|
* request to a stripe width boundary if the file size is >=
|
|
* stripe width and we are allocating past the allocation eof.
|
|
*/
|
|
else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) &&
|
|
(ip->i_size >= XFS_FSB_TO_B(mp, mp->m_swidth)))
|
|
new_last_fsb = roundup_64(*last_fsb, mp->m_swidth);
|
|
/*
|
|
* Roundup the allocation request to a stripe unit (m_dalign) boundary
|
|
* if the file size is >= stripe unit size, and we are allocating past
|
|
* the allocation eof.
|
|
*/
|
|
else if (mp->m_dalign && (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_dalign)))
|
|
new_last_fsb = roundup_64(*last_fsb, mp->m_dalign);
|
|
|
|
/*
|
|
* Always round up the allocation request to an extent boundary
|
|
* (when file on a real-time subvolume or has di_extsize hint).
|
|
*/
|
|
if (extsize) {
|
|
if (new_last_fsb)
|
|
align = roundup_64(new_last_fsb, extsize);
|
|
else
|
|
align = extsize;
|
|
new_last_fsb = roundup_64(*last_fsb, align);
|
|
}
|
|
|
|
if (new_last_fsb) {
|
|
error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
|
|
if (error)
|
|
return error;
|
|
if (eof)
|
|
*last_fsb = new_last_fsb;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_alert_fsblock_zero(
|
|
xfs_inode_t *ip,
|
|
xfs_bmbt_irec_t *imap)
|
|
{
|
|
xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
|
|
"Access to block zero in inode %llu "
|
|
"start_block: %llx start_off: %llx "
|
|
"blkcnt: %llx extent-state: %x\n",
|
|
(unsigned long long)ip->i_ino,
|
|
(unsigned long long)imap->br_startblock,
|
|
(unsigned long long)imap->br_startoff,
|
|
(unsigned long long)imap->br_blockcount,
|
|
imap->br_state);
|
|
return EFSCORRUPTED;
|
|
}
|
|
|
|
int
|
|
xfs_iomap_write_direct(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count,
|
|
xfs_bmbt_irec_t *imap,
|
|
int nmaps)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb;
|
|
xfs_fileoff_t last_fsb;
|
|
xfs_filblks_t count_fsb, resaligned;
|
|
xfs_fsblock_t firstfsb;
|
|
xfs_extlen_t extsz, temp;
|
|
int nimaps;
|
|
int bmapi_flag;
|
|
int quota_flag;
|
|
int rt;
|
|
xfs_trans_t *tp;
|
|
xfs_bmap_free_t free_list;
|
|
uint qblocks, resblks, resrtextents;
|
|
int committed;
|
|
int error;
|
|
|
|
/*
|
|
* Make sure that the dquots are there. This doesn't hold
|
|
* the ilock across a disk read.
|
|
*/
|
|
error = xfs_qm_dqattach_locked(ip, 0);
|
|
if (error)
|
|
return XFS_ERROR(error);
|
|
|
|
rt = XFS_IS_REALTIME_INODE(ip);
|
|
extsz = xfs_get_extsz_hint(ip);
|
|
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
|
|
if ((offset + count) > ip->i_size) {
|
|
error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
|
|
if (error)
|
|
goto error_out;
|
|
} else {
|
|
if (nmaps && (imap->br_startblock == HOLESTARTBLOCK))
|
|
last_fsb = MIN(last_fsb, (xfs_fileoff_t)
|
|
imap->br_blockcount +
|
|
imap->br_startoff);
|
|
}
|
|
count_fsb = last_fsb - offset_fsb;
|
|
ASSERT(count_fsb > 0);
|
|
|
|
resaligned = count_fsb;
|
|
if (unlikely(extsz)) {
|
|
if ((temp = do_mod(offset_fsb, extsz)))
|
|
resaligned += temp;
|
|
if ((temp = do_mod(resaligned, extsz)))
|
|
resaligned += extsz - temp;
|
|
}
|
|
|
|
if (unlikely(rt)) {
|
|
resrtextents = qblocks = resaligned;
|
|
resrtextents /= mp->m_sb.sb_rextsize;
|
|
resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
|
|
quota_flag = XFS_QMOPT_RES_RTBLKS;
|
|
} else {
|
|
resrtextents = 0;
|
|
resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
|
|
quota_flag = XFS_QMOPT_RES_REGBLKS;
|
|
}
|
|
|
|
/*
|
|
* Allocate and setup the transaction
|
|
*/
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
|
|
error = xfs_trans_reserve(tp, resblks,
|
|
XFS_WRITE_LOG_RES(mp), resrtextents,
|
|
XFS_TRANS_PERM_LOG_RES,
|
|
XFS_WRITE_LOG_COUNT);
|
|
/*
|
|
* Check for running out of space, note: need lock to return
|
|
*/
|
|
if (error)
|
|
xfs_trans_cancel(tp, 0);
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
if (error)
|
|
goto error_out;
|
|
|
|
error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
|
|
if (error)
|
|
goto error1;
|
|
|
|
xfs_trans_ijoin(tp, ip);
|
|
|
|
bmapi_flag = XFS_BMAPI_WRITE;
|
|
if (offset < ip->i_size || extsz)
|
|
bmapi_flag |= XFS_BMAPI_PREALLOC;
|
|
|
|
/*
|
|
* Issue the xfs_bmapi() call to allocate the blocks.
|
|
*
|
|
* From this point onwards we overwrite the imap pointer that the
|
|
* caller gave to us.
|
|
*/
|
|
xfs_bmap_init(&free_list, &firstfsb);
|
|
nimaps = 1;
|
|
error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, bmapi_flag,
|
|
&firstfsb, 0, imap, &nimaps, &free_list);
|
|
if (error)
|
|
goto error0;
|
|
|
|
/*
|
|
* Complete the transaction
|
|
*/
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
goto error0;
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error)
|
|
goto error_out;
|
|
|
|
/*
|
|
* Copy any maps to caller's array and return any error.
|
|
*/
|
|
if (nimaps == 0) {
|
|
error = ENOSPC;
|
|
goto error_out;
|
|
}
|
|
|
|
if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) {
|
|
error = xfs_alert_fsblock_zero(ip, imap);
|
|
goto error_out;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
|
|
|
|
error1: /* Just cancel transaction */
|
|
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
|
|
|
error_out:
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
/*
|
|
* If the caller is doing a write at the end of the file, then extend the
|
|
* allocation out to the file system's write iosize. We clean up any extra
|
|
* space left over when the file is closed in xfs_inactive().
|
|
*
|
|
* If we find we already have delalloc preallocation beyond EOF, don't do more
|
|
* preallocation as it it not needed.
|
|
*/
|
|
STATIC int
|
|
xfs_iomap_eof_want_preallocate(
|
|
xfs_mount_t *mp,
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count,
|
|
xfs_bmbt_irec_t *imap,
|
|
int nimaps,
|
|
int *prealloc)
|
|
{
|
|
xfs_fileoff_t start_fsb;
|
|
xfs_filblks_t count_fsb;
|
|
xfs_fsblock_t firstblock;
|
|
int n, error, imaps;
|
|
int found_delalloc = 0;
|
|
|
|
*prealloc = 0;
|
|
if ((offset + count) <= ip->i_size)
|
|
return 0;
|
|
|
|
/*
|
|
* If there are any real blocks past eof, then don't
|
|
* do any speculative allocation.
|
|
*/
|
|
start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
|
|
count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
|
|
while (count_fsb > 0) {
|
|
imaps = nimaps;
|
|
firstblock = NULLFSBLOCK;
|
|
error = xfs_bmapi(NULL, ip, start_fsb, count_fsb, 0,
|
|
&firstblock, 0, imap, &imaps, NULL);
|
|
if (error)
|
|
return error;
|
|
for (n = 0; n < imaps; n++) {
|
|
if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
|
|
(imap[n].br_startblock != DELAYSTARTBLOCK))
|
|
return 0;
|
|
start_fsb += imap[n].br_blockcount;
|
|
count_fsb -= imap[n].br_blockcount;
|
|
|
|
if (imap[n].br_startblock == DELAYSTARTBLOCK)
|
|
found_delalloc = 1;
|
|
}
|
|
}
|
|
if (!found_delalloc)
|
|
*prealloc = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we don't have a user specified preallocation size, dynamically increase
|
|
* the preallocation size as the size of the file grows. Cap the maximum size
|
|
* at a single extent or less if the filesystem is near full. The closer the
|
|
* filesystem is to full, the smaller the maximum prealocation.
|
|
*/
|
|
STATIC xfs_fsblock_t
|
|
xfs_iomap_prealloc_size(
|
|
struct xfs_mount *mp,
|
|
struct xfs_inode *ip)
|
|
{
|
|
xfs_fsblock_t alloc_blocks = 0;
|
|
|
|
if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
|
|
int shift = 0;
|
|
int64_t freesp;
|
|
|
|
/*
|
|
* rounddown_pow_of_two() returns an undefined result
|
|
* if we pass in alloc_blocks = 0. Hence the "+ 1" to
|
|
* ensure we always pass in a non-zero value.
|
|
*/
|
|
alloc_blocks = XFS_B_TO_FSB(mp, ip->i_size) + 1;
|
|
alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN,
|
|
rounddown_pow_of_two(alloc_blocks));
|
|
|
|
xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
|
|
freesp = mp->m_sb.sb_fdblocks;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
|
|
shift = 2;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
|
|
shift++;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
|
|
shift++;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
|
|
shift++;
|
|
if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
|
|
shift++;
|
|
}
|
|
if (shift)
|
|
alloc_blocks >>= shift;
|
|
}
|
|
|
|
if (alloc_blocks < mp->m_writeio_blocks)
|
|
alloc_blocks = mp->m_writeio_blocks;
|
|
|
|
return alloc_blocks;
|
|
}
|
|
|
|
int
|
|
xfs_iomap_write_delay(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count,
|
|
xfs_bmbt_irec_t *ret_imap)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb;
|
|
xfs_fileoff_t last_fsb;
|
|
xfs_off_t aligned_offset;
|
|
xfs_fileoff_t ioalign;
|
|
xfs_fsblock_t firstblock;
|
|
xfs_extlen_t extsz;
|
|
int nimaps;
|
|
xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
|
|
int prealloc, flushed = 0;
|
|
int error;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
/*
|
|
* Make sure that the dquots are there. This doesn't hold
|
|
* the ilock across a disk read.
|
|
*/
|
|
error = xfs_qm_dqattach_locked(ip, 0);
|
|
if (error)
|
|
return XFS_ERROR(error);
|
|
|
|
extsz = xfs_get_extsz_hint(ip);
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
|
|
|
|
error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count,
|
|
imap, XFS_WRITE_IMAPS, &prealloc);
|
|
if (error)
|
|
return error;
|
|
|
|
retry:
|
|
if (prealloc) {
|
|
xfs_fsblock_t alloc_blocks = xfs_iomap_prealloc_size(mp, ip);
|
|
|
|
aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
|
|
ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
|
|
last_fsb = ioalign + alloc_blocks;
|
|
} else {
|
|
last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
|
|
}
|
|
|
|
if (prealloc || extsz) {
|
|
error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
nimaps = XFS_WRITE_IMAPS;
|
|
firstblock = NULLFSBLOCK;
|
|
error = xfs_bmapi(NULL, ip, offset_fsb,
|
|
(xfs_filblks_t)(last_fsb - offset_fsb),
|
|
XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
|
|
XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
|
|
&nimaps, NULL);
|
|
switch (error) {
|
|
case 0:
|
|
case ENOSPC:
|
|
case EDQUOT:
|
|
break;
|
|
default:
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
/*
|
|
* If bmapi returned us nothing, we got either ENOSPC or EDQUOT. For
|
|
* ENOSPC, * flush all other inodes with delalloc blocks to free up
|
|
* some of the excess reserved metadata space. For both cases, retry
|
|
* without EOF preallocation.
|
|
*/
|
|
if (nimaps == 0) {
|
|
trace_xfs_delalloc_enospc(ip, offset, count);
|
|
if (flushed)
|
|
return XFS_ERROR(error ? error : ENOSPC);
|
|
|
|
if (error == ENOSPC) {
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
xfs_flush_inodes(ip);
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
flushed = 1;
|
|
error = 0;
|
|
prealloc = 0;
|
|
goto retry;
|
|
}
|
|
|
|
if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip)))
|
|
return xfs_alert_fsblock_zero(ip, &imap[0]);
|
|
|
|
*ret_imap = imap[0];
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pass in a delayed allocate extent, convert it to real extents;
|
|
* return to the caller the extent we create which maps on top of
|
|
* the originating callers request.
|
|
*
|
|
* Called without a lock on the inode.
|
|
*
|
|
* We no longer bother to look at the incoming map - all we have to
|
|
* guarantee is that whatever we allocate fills the required range.
|
|
*/
|
|
int
|
|
xfs_iomap_write_allocate(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count,
|
|
xfs_bmbt_irec_t *imap)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb, last_block;
|
|
xfs_fileoff_t end_fsb, map_start_fsb;
|
|
xfs_fsblock_t first_block;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_filblks_t count_fsb;
|
|
xfs_trans_t *tp;
|
|
int nimaps, committed;
|
|
int error = 0;
|
|
int nres;
|
|
|
|
/*
|
|
* Make sure that the dquots are there.
|
|
*/
|
|
error = xfs_qm_dqattach(ip, 0);
|
|
if (error)
|
|
return XFS_ERROR(error);
|
|
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
count_fsb = imap->br_blockcount;
|
|
map_start_fsb = imap->br_startoff;
|
|
|
|
XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
|
|
|
|
while (count_fsb != 0) {
|
|
/*
|
|
* Set up a transaction with which to allocate the
|
|
* backing store for the file. Do allocations in a
|
|
* loop until we get some space in the range we are
|
|
* interested in. The other space that might be allocated
|
|
* is in the delayed allocation extent on which we sit
|
|
* but before our buffer starts.
|
|
*/
|
|
|
|
nimaps = 0;
|
|
while (nimaps == 0) {
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
|
|
tp->t_flags |= XFS_TRANS_RESERVE;
|
|
nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
|
|
error = xfs_trans_reserve(tp, nres,
|
|
XFS_WRITE_LOG_RES(mp),
|
|
0, XFS_TRANS_PERM_LOG_RES,
|
|
XFS_WRITE_LOG_COUNT);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return XFS_ERROR(error);
|
|
}
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip);
|
|
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
|
|
/*
|
|
* it is possible that the extents have changed since
|
|
* we did the read call as we dropped the ilock for a
|
|
* while. We have to be careful about truncates or hole
|
|
* punchs here - we are not allowed to allocate
|
|
* non-delalloc blocks here.
|
|
*
|
|
* The only protection against truncation is the pages
|
|
* for the range we are being asked to convert are
|
|
* locked and hence a truncate will block on them
|
|
* first.
|
|
*
|
|
* As a result, if we go beyond the range we really
|
|
* need and hit an delalloc extent boundary followed by
|
|
* a hole while we have excess blocks in the map, we
|
|
* will fill the hole incorrectly and overrun the
|
|
* transaction reservation.
|
|
*
|
|
* Using a single map prevents this as we are forced to
|
|
* check each map we look for overlap with the desired
|
|
* range and abort as soon as we find it. Also, given
|
|
* that we only return a single map, having one beyond
|
|
* what we can return is probably a bit silly.
|
|
*
|
|
* We also need to check that we don't go beyond EOF;
|
|
* this is a truncate optimisation as a truncate sets
|
|
* the new file size before block on the pages we
|
|
* currently have locked under writeback. Because they
|
|
* are about to be tossed, we don't need to write them
|
|
* back....
|
|
*/
|
|
nimaps = 1;
|
|
end_fsb = XFS_B_TO_FSB(mp, ip->i_size);
|
|
error = xfs_bmap_last_offset(NULL, ip, &last_block,
|
|
XFS_DATA_FORK);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
|
|
if ((map_start_fsb + count_fsb) > last_block) {
|
|
count_fsb = last_block - map_start_fsb;
|
|
if (count_fsb == 0) {
|
|
error = EAGAIN;
|
|
goto trans_cancel;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Go get the actual blocks.
|
|
*
|
|
* From this point onwards we overwrite the imap
|
|
* pointer that the caller gave to us.
|
|
*/
|
|
error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb,
|
|
XFS_BMAPI_WRITE, &first_block, 1,
|
|
imap, &nimaps, &free_list);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error)
|
|
goto error0;
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
/*
|
|
* See if we were able to allocate an extent that
|
|
* covers at least part of the callers request
|
|
*/
|
|
if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
|
|
return xfs_alert_fsblock_zero(ip, imap);
|
|
|
|
if ((offset_fsb >= imap->br_startoff) &&
|
|
(offset_fsb < (imap->br_startoff +
|
|
imap->br_blockcount))) {
|
|
XFS_STATS_INC(xs_xstrat_quick);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* So far we have not mapped the requested part of the
|
|
* file, just surrounding data, try again.
|
|
*/
|
|
count_fsb -= imap->br_blockcount;
|
|
map_start_fsb = imap->br_startoff + imap->br_blockcount;
|
|
}
|
|
|
|
trans_cancel:
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
|
error0:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
int
|
|
xfs_iomap_write_unwritten(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb;
|
|
xfs_filblks_t count_fsb;
|
|
xfs_filblks_t numblks_fsb;
|
|
xfs_fsblock_t firstfsb;
|
|
int nimaps;
|
|
xfs_trans_t *tp;
|
|
xfs_bmbt_irec_t imap;
|
|
xfs_bmap_free_t free_list;
|
|
uint resblks;
|
|
int committed;
|
|
int error;
|
|
|
|
trace_xfs_unwritten_convert(ip, offset, count);
|
|
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
|
|
count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
|
|
|
|
/*
|
|
* Reserve enough blocks in this transaction for two complete extent
|
|
* btree splits. We may be converting the middle part of an unwritten
|
|
* extent and in this case we will insert two new extents in the btree
|
|
* each of which could cause a full split.
|
|
*
|
|
* This reservation amount will be used in the first call to
|
|
* xfs_bmbt_split() to select an AG with enough space to satisfy the
|
|
* rest of the operation.
|
|
*/
|
|
resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
|
|
|
|
do {
|
|
/*
|
|
* set up a transaction to convert the range of extents
|
|
* from unwritten to real. Do allocations in a loop until
|
|
* we have covered the range passed in.
|
|
*
|
|
* Note that we open code the transaction allocation here
|
|
* to pass KM_NOFS--we can't risk to recursing back into
|
|
* the filesystem here as we might be asked to write out
|
|
* the same inode that we complete here and might deadlock
|
|
* on the iolock.
|
|
*/
|
|
xfs_wait_for_freeze(mp, SB_FREEZE_TRANS);
|
|
tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS);
|
|
tp->t_flags |= XFS_TRANS_RESERVE;
|
|
error = xfs_trans_reserve(tp, resblks,
|
|
XFS_WRITE_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES,
|
|
XFS_WRITE_LOG_COUNT);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip);
|
|
|
|
/*
|
|
* Modify the unwritten extent state of the buffer.
|
|
*/
|
|
xfs_bmap_init(&free_list, &firstfsb);
|
|
nimaps = 1;
|
|
error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
|
|
XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb,
|
|
1, &imap, &nimaps, &free_list);
|
|
if (error)
|
|
goto error_on_bmapi_transaction;
|
|
|
|
error = xfs_bmap_finish(&(tp), &(free_list), &committed);
|
|
if (error)
|
|
goto error_on_bmapi_transaction;
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
if (error)
|
|
return XFS_ERROR(error);
|
|
|
|
if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
|
|
return xfs_alert_fsblock_zero(ip, &imap);
|
|
|
|
if ((numblks_fsb = imap.br_blockcount) == 0) {
|
|
/*
|
|
* The numblks_fsb value should always get
|
|
* smaller, otherwise the loop is stuck.
|
|
*/
|
|
ASSERT(imap.br_blockcount);
|
|
break;
|
|
}
|
|
offset_fsb += numblks_fsb;
|
|
count_fsb -= numblks_fsb;
|
|
} while (count_fsb > 0);
|
|
|
|
return 0;
|
|
|
|
error_on_bmapi_transaction:
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return XFS_ERROR(error);
|
|
}
|