summaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_iomap.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/xfs/xfs_iomap.c')
-rw-r--r--fs/xfs/xfs_iomap.c1000
1 files changed, 1000 insertions, 0 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
new file mode 100644
index 000000000000..3826e8f0e28a
--- /dev/null
+++ b/fs/xfs/xfs_iomap.c
@@ -0,0 +1,1000 @@
+/*
+ * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 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.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+
+#include "xfs_fs.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_alloc.h"
+#include "xfs_dmapi.h"
+#include "xfs_quota.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_bit.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_itable.h"
+#include "xfs_rw.h"
+#include "xfs_acl.h"
+#include "xfs_cap.h"
+#include "xfs_mac.h"
+#include "xfs_attr.h"
+#include "xfs_buf_item.h"
+#include "xfs_trans_space.h"
+#include "xfs_utils.h"
+#include "xfs_iomap.h"
+
+#if defined(XFS_RW_TRACE)
+void
+xfs_iomap_enter_trace(
+ int tag,
+ xfs_iocore_t *io,
+ xfs_off_t offset,
+ ssize_t count)
+{
+ xfs_inode_t *ip = XFS_IO_INODE(io);
+
+ if (!ip->i_rwtrace)
+ return;
+
+ ktrace_enter(ip->i_rwtrace,
+ (void *)((unsigned long)tag),
+ (void *)ip,
+ (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
+ (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
+ (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
+ (void *)((unsigned long)(offset & 0xffffffff)),
+ (void *)((unsigned long)count),
+ (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)),
+ (void *)((unsigned long)(io->io_new_size & 0xffffffff)),
+ (void *)NULL,
+ (void *)NULL,
+ (void *)NULL,
+ (void *)NULL,
+ (void *)NULL,
+ (void *)NULL,
+ (void *)NULL);
+}
+
+void
+xfs_iomap_map_trace(
+ int tag,
+ xfs_iocore_t *io,
+ xfs_off_t offset,
+ ssize_t count,
+ xfs_iomap_t *iomapp,
+ xfs_bmbt_irec_t *imapp,
+ int flags)
+{
+ xfs_inode_t *ip = XFS_IO_INODE(io);
+
+ if (!ip->i_rwtrace)
+ return;
+
+ ktrace_enter(ip->i_rwtrace,
+ (void *)((unsigned long)tag),
+ (void *)ip,
+ (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
+ (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
+ (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
+ (void *)((unsigned long)(offset & 0xffffffff)),
+ (void *)((unsigned long)count),
+ (void *)((unsigned long)flags),
+ (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)),
+ (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)),
+ (void *)((unsigned long)(iomapp->iomap_delta)),
+ (void *)((unsigned long)(iomapp->iomap_bsize)),
+ (void *)((unsigned long)(iomapp->iomap_bn)),
+ (void *)(__psint_t)(imapp->br_startoff),
+ (void *)((unsigned long)(imapp->br_blockcount)),
+ (void *)(__psint_t)(imapp->br_startblock));
+}
+#else
+#define xfs_iomap_enter_trace(tag, io, offset, count)
+#define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags)
+#endif
+
+#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_imap_to_bmap(
+ xfs_iocore_t *io,
+ xfs_off_t offset,
+ xfs_bmbt_irec_t *imap,
+ xfs_iomap_t *iomapp,
+ int imaps, /* Number of imap entries */
+ int iomaps, /* Number of iomap entries */
+ int flags)
+{
+ xfs_mount_t *mp;
+ xfs_fsize_t nisize;
+ int pbm;
+ xfs_fsblock_t start_block;
+
+ mp = io->io_mount;
+ nisize = XFS_SIZE(mp, io);
+ if (io->io_new_size > nisize)
+ nisize = io->io_new_size;
+
+ for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) {
+ iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff);
+ iomapp->iomap_delta = offset - iomapp->iomap_offset;
+ iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);
+ iomapp->iomap_flags = flags;
+
+ if (io->io_flags & XFS_IOCORE_RT) {
+ iomapp->iomap_flags |= IOMAP_REALTIME;
+ iomapp->iomap_target = mp->m_rtdev_targp;
+ } else {
+ iomapp->iomap_target = mp->m_ddev_targp;
+ }
+ start_block = imap->br_startblock;
+ if (start_block == HOLESTARTBLOCK) {
+ iomapp->iomap_bn = IOMAP_DADDR_NULL;
+ iomapp->iomap_flags |= IOMAP_HOLE;
+ } else if (start_block == DELAYSTARTBLOCK) {
+ iomapp->iomap_bn = IOMAP_DADDR_NULL;
+ iomapp->iomap_flags |= IOMAP_DELAY;
+ } else {
+ iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block);
+ if (ISUNWRITTEN(imap))
+ iomapp->iomap_flags |= IOMAP_UNWRITTEN;
+ }
+
+ if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) {
+ iomapp->iomap_flags |= IOMAP_EOF;
+ }
+
+ offset += iomapp->iomap_bsize - iomapp->iomap_delta;
+ }
+ return pbm; /* Return the number filled */
+}
+
+int
+xfs_iomap(
+ xfs_iocore_t *io,
+ xfs_off_t offset,
+ ssize_t count,
+ int flags,
+ xfs_iomap_t *iomapp,
+ int *niomaps)
+{
+ xfs_mount_t *mp = io->io_mount;
+ xfs_fileoff_t offset_fsb, end_fsb;
+ int error = 0;
+ int lockmode = 0;
+ xfs_bmbt_irec_t imap;
+ int nimaps = 1;
+ int bmapi_flags = 0;
+ int iomap_flags = 0;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ switch (flags &
+ (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE |
+ BMAPI_UNWRITTEN | BMAPI_DEVICE)) {
+ case BMAPI_READ:
+ xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count);
+ lockmode = XFS_LCK_MAP_SHARED(mp, io);
+ bmapi_flags = XFS_BMAPI_ENTIRE;
+ if (flags & BMAPI_IGNSTATE)
+ bmapi_flags |= XFS_BMAPI_IGSTATE;
+ break;
+ case BMAPI_WRITE:
+ xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count);
+ lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR;
+ bmapi_flags = 0;
+ XFS_ILOCK(mp, io, lockmode);
+ break;
+ case BMAPI_ALLOCATE:
+ xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count);
+ lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD;
+ bmapi_flags = XFS_BMAPI_ENTIRE;
+ /* Attempt non-blocking lock */
+ if (flags & BMAPI_TRYLOCK) {
+ if (!XFS_ILOCK_NOWAIT(mp, io, lockmode))
+ return XFS_ERROR(EAGAIN);
+ } else {
+ XFS_ILOCK(mp, io, lockmode);
+ }
+ break;
+ case BMAPI_UNWRITTEN:
+ goto phase2;
+ case BMAPI_DEVICE:
+ lockmode = XFS_LCK_MAP_SHARED(mp, io);
+ iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ?
+ mp->m_rtdev_targp : mp->m_ddev_targp;
+ error = 0;
+ *niomaps = 1;
+ goto out;
+ 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(mp, NULL, io, offset_fsb,
+ (xfs_filblks_t)(end_fsb - offset_fsb),
+ bmapi_flags, NULL, 0, &imap,
+ &nimaps, NULL);
+
+ if (error)
+ goto out;
+
+phase2:
+ switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) {
+ case BMAPI_WRITE:
+ /* If we found an extent, return it */
+ if (nimaps && (imap.br_startblock != HOLESTARTBLOCK)) {
+ xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
+ offset, count, iomapp, &imap, flags);
+ break;
+ }
+
+ if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
+ error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset,
+ count, flags, &imap, &nimaps, nimaps);
+ } else {
+ error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count,
+ flags, &imap, &nimaps);
+ }
+ if (!error) {
+ xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io,
+ offset, count, iomapp, &imap, flags);
+ }
+ iomap_flags = IOMAP_NEW;
+ break;
+ case BMAPI_ALLOCATE:
+ /* If we found an extent, return it */
+ XFS_IUNLOCK(mp, io, lockmode);
+ lockmode = 0;
+
+ if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {
+ xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
+ offset, count, iomapp, &imap, flags);
+ break;
+ }
+
+ error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, &imap, &nimaps);
+ break;
+ case BMAPI_UNWRITTEN:
+ lockmode = 0;
+ error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count);
+ nimaps = 0;
+ break;
+ }
+
+ if (nimaps) {
+ *niomaps = xfs_imap_to_bmap(io, offset, &imap,
+ iomapp, nimaps, *niomaps, iomap_flags);
+ } else if (niomaps) {
+ *niomaps = 0;
+ }
+
+out:
+ if (lockmode)
+ XFS_IUNLOCK(mp, io, lockmode);
+ return XFS_ERROR(error);
+}
+
+STATIC int
+xfs_flush_space(
+ xfs_inode_t *ip,
+ int *fsynced,
+ int *ioflags)
+{
+ switch (*fsynced) {
+ case 0:
+ if (ip->i_delayed_blks) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_flush_inode(ip);
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ *fsynced = 1;
+ } else {
+ *ioflags |= BMAPI_SYNC;
+ *fsynced = 2;
+ }
+ return 0;
+ case 1:
+ *fsynced = 2;
+ *ioflags |= BMAPI_SYNC;
+ return 0;
+ case 2:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_flush_device(ip);
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ *fsynced = 3;
+ return 0;
+ }
+ return 1;
+}
+
+int
+xfs_iomap_write_direct(
+ xfs_inode_t *ip,
+ loff_t offset,
+ size_t count,
+ int flags,
+ xfs_bmbt_irec_t *ret_imap,
+ int *nmaps,
+ int found)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_iocore_t *io = &ip->i_iocore;
+ xfs_fileoff_t offset_fsb;
+ xfs_fileoff_t last_fsb;
+ xfs_filblks_t count_fsb;
+ xfs_fsize_t isize;
+ xfs_fsblock_t firstfsb;
+ int nimaps, maps;
+ int error;
+ int bmapi_flag;
+ int rt;
+ xfs_trans_t *tp;
+ xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp;
+ xfs_bmap_free_t free_list;
+ int aeof;
+ xfs_filblks_t datablocks;
+ int committed;
+ int numrtextents;
+ uint resblks;
+
+ /*
+ * Make sure that the dquots are there. This doesn't hold
+ * the ilock across a disk read.
+ */
+ error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
+ if (error)
+ return XFS_ERROR(error);
+
+ maps = min(XFS_WRITE_IMAPS, *nmaps);
+ nimaps = maps;
+
+ isize = ip->i_d.di_size;
+ aeof = (offset + count) > isize;
+
+ if (io->io_new_size > isize)
+ isize = io->io_new_size;
+
+ offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
+ count_fsb = last_fsb - offset_fsb;
+ if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) {
+ xfs_fileoff_t map_last_fsb;
+
+ map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff;
+
+ if (map_last_fsb < last_fsb) {
+ last_fsb = map_last_fsb;
+ count_fsb = last_fsb - offset_fsb;
+ }
+ ASSERT(count_fsb > 0);
+ }
+
+ /*
+ * determine if reserving space on
+ * the data or realtime partition.
+ */
+ if ((rt = XFS_IS_REALTIME_INODE(ip))) {
+ int sbrtextsize, iprtextsize;
+
+ sbrtextsize = mp->m_sb.sb_rextsize;
+ iprtextsize =
+ ip->i_d.di_extsize ? ip->i_d.di_extsize : sbrtextsize;
+ numrtextents = (count_fsb + iprtextsize - 1);
+ do_div(numrtextents, sbrtextsize);
+ datablocks = 0;
+ } else {
+ datablocks = count_fsb;
+ numrtextents = 0;
+ }
+
+ /*
+ * allocate and setup the transaction
+ */
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
+
+ resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks);
+
+ error = xfs_trans_reserve(tp, resblks,
+ XFS_WRITE_LOG_RES(mp), numrtextents,
+ XFS_TRANS_PERM_LOG_RES,
+ XFS_WRITE_LOG_COUNT);
+
+ /*
+ * check for running out of space
+ */
+ if (error)
+ /*
+ * Free the transaction structure.
+ */
+ xfs_trans_cancel(tp, 0);
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+ if (error)
+ goto error_out; /* Don't return in above if .. trans ..,
+ need lock to return */
+
+ if (XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, resblks)) {
+ error = (EDQUOT);
+ goto error1;
+ }
+ nimaps = 1;
+
+ bmapi_flag = XFS_BMAPI_WRITE;
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+ xfs_trans_ihold(tp, ip);
+
+ if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt))
+ bmapi_flag |= XFS_BMAPI_PREALLOC;
+
+ /*
+ * issue the bmapi() call to allocate the blocks
+ */
+ XFS_BMAP_INIT(&free_list, &firstfsb);
+ imapp = &imap[0];
+ error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
+ bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list);
+ if (error) {
+ goto error0;
+ }
+
+ /*
+ * complete the transaction
+ */
+
+ error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
+ if (error) {
+ goto error0;
+ }
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
+ if (error) {
+ goto error_out;
+ }
+
+ /* copy any maps to caller's array and return any error. */
+ if (nimaps == 0) {
+ error = (ENOSPC);
+ goto error_out;
+ }
+
+ *ret_imap = imap[0];
+ *nmaps = 1;
+ if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
+ cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
+ "start_block : %llx start_off : %llx blkcnt : %llx "
+ "extent-state : %x \n",
+ (ip->i_mount)->m_fsname,
+ (long long)ip->i_ino,
+ ret_imap->br_startblock, ret_imap->br_startoff,
+ ret_imap->br_blockcount,ret_imap->br_state);
+ }
+ return 0;
+
+ error0: /* Cancel bmap, unlock inode, and cancel trans */
+ xfs_bmap_cancel(&free_list);
+
+ error1: /* Just cancel transaction */
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
+ *nmaps = 0; /* nothing set-up here */
+
+error_out:
+ return XFS_ERROR(error);
+}
+
+int
+xfs_iomap_write_delay(
+ xfs_inode_t *ip,
+ loff_t offset,
+ size_t count,
+ int ioflag,
+ xfs_bmbt_irec_t *ret_imap,
+ int *nmaps)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_iocore_t *io = &ip->i_iocore;
+ xfs_fileoff_t offset_fsb;
+ xfs_fileoff_t last_fsb;
+ xfs_fsize_t isize;
+ xfs_fsblock_t firstblock;
+ int nimaps;
+ int error;
+ xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
+ int aeof;
+ int fsynced = 0;
+
+ ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
+
+ /*
+ * Make sure that the dquots are there. This doesn't hold
+ * the ilock across a disk read.
+ */
+
+ error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
+ if (error)
+ return XFS_ERROR(error);
+
+retry:
+ isize = ip->i_d.di_size;
+ if (io->io_new_size > isize) {
+ isize = io->io_new_size;
+ }
+
+ aeof = 0;
+ offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
+ /*
+ * If the caller is doing a write at the end of the file,
+ * then extend the allocation (and the buffer used for the write)
+ * out to the file system's write iosize. We clean up any extra
+ * space left over when the file is closed in xfs_inactive().
+ *
+ * For sync writes, we are flushing delayed allocate space to
+ * try to make additional space available for allocation near
+ * the filesystem full boundary - preallocation hurts in that
+ * situation, of course.
+ */
+ if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) {
+ xfs_off_t aligned_offset;
+ xfs_filblks_t count_fsb;
+ unsigned int iosize;
+ xfs_fileoff_t ioalign;
+ int n;
+ xfs_fileoff_t start_fsb;
+
+ /*
+ * 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) {
+ nimaps = XFS_WRITE_IMAPS;
+ error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb,
+ 0, &firstblock, 0, imap, &nimaps, NULL);
+ if (error) {
+ return error;
+ }
+ for (n = 0; n < nimaps; n++) {
+ if ( !(io->io_flags & XFS_IOCORE_RT) &&
+ !imap[n].br_startblock) {
+ cmn_err(CE_PANIC,"Access to block "
+ "zero: fs <%s> inode: %lld "
+ "start_block : %llx start_off "
+ ": %llx blkcnt : %llx "
+ "extent-state : %x \n",
+ (ip->i_mount)->m_fsname,
+ (long long)ip->i_ino,
+ imap[n].br_startblock,
+ imap[n].br_startoff,
+ imap[n].br_blockcount,
+ imap[n].br_state);
+ }
+ if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
+ (imap[n].br_startblock != DELAYSTARTBLOCK)) {
+ goto write_map;
+ }
+ start_fsb += imap[n].br_blockcount;
+ count_fsb -= imap[n].br_blockcount;
+ }
+ }
+ iosize = mp->m_writeio_blocks;
+ aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
+ ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
+ last_fsb = ioalign + iosize;
+ aeof = 1;
+ }
+write_map:
+ nimaps = XFS_WRITE_IMAPS;
+ firstblock = NULLFSBLOCK;
+
+ /*
+ * 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.
+ */
+ if (!(io->io_flags & XFS_IOCORE_RT) && mp->m_swidth
+ && (mp->m_flags & XFS_MOUNT_SWALLOC)
+ && (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)) && aeof) {
+ int eof;
+ xfs_fileoff_t new_last_fsb;
+
+ new_last_fsb = roundup_64(last_fsb, mp->m_swidth);
+ error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
+ if (error) {
+ return error;
+ }
+ if (eof) {
+ last_fsb = new_last_fsb;
+ }
+ /*
+ * 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 (!(io->io_flags & XFS_IOCORE_RT) && mp->m_dalign &&
+ (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)) && aeof) {
+ int eof;
+ xfs_fileoff_t new_last_fsb;
+ new_last_fsb = roundup_64(last_fsb, mp->m_dalign);
+ error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
+ if (error) {
+ return error;
+ }
+ if (eof) {
+ last_fsb = new_last_fsb;
+ }
+ /*
+ * Round up the allocation request to a real-time extent boundary
+ * if the file is on the real-time subvolume.
+ */
+ } else if (io->io_flags & XFS_IOCORE_RT && aeof) {
+ int eof;
+ xfs_fileoff_t new_last_fsb;
+
+ new_last_fsb = roundup_64(last_fsb, mp->m_sb.sb_rextsize);
+ error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
+ if (error) {
+ return error;
+ }
+ if (eof)
+ last_fsb = new_last_fsb;
+ }
+ 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);
+ /*
+ * This can be EDQUOT, if nimaps == 0
+ */
+ if (error && (error != ENOSPC)) {
+ return XFS_ERROR(error);
+ }
+ /*
+ * If bmapi returned us nothing, and if we didn't get back EDQUOT,
+ * then we must have run out of space.
+ */
+ if (nimaps == 0) {
+ xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
+ io, offset, count);
+ if (xfs_flush_space(ip, &fsynced, &ioflag))
+ return XFS_ERROR(ENOSPC);
+
+ error = 0;
+ goto retry;
+ }
+
+ *ret_imap = imap[0];
+ *nmaps = 1;
+ if ( !(io->io_flags & XFS_IOCORE_RT) && !ret_imap->br_startblock) {
+ cmn_err(CE_PANIC,"Access to block zero: fs <%s> inode: %lld "
+ "start_block : %llx start_off : %llx blkcnt : %llx "
+ "extent-state : %x \n",
+ (ip->i_mount)->m_fsname,
+ (long long)ip->i_ino,
+ ret_imap->br_startblock, ret_imap->br_startoff,
+ ret_imap->br_blockcount,ret_imap->br_state);
+ }
+ 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.
+ */
+int
+xfs_iomap_write_allocate(
+ xfs_inode_t *ip,
+ xfs_bmbt_irec_t *map,
+ int *retmap)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_iocore_t *io = &ip->i_iocore;
+ 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_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];
+ xfs_trans_t *tp;
+ int i, nimaps, committed;
+ int error = 0;
+ int nres;
+
+ *retmap = 0;
+
+ /*
+ * Make sure that the dquots are there.
+ */
+ if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
+ return XFS_ERROR(error);
+
+ offset_fsb = map->br_startoff;
+ count_fsb = map->br_blockcount;
+ map_start_fsb = offset_fsb;
+
+ 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);
+ 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 == ENOSPC) {
+ error = xfs_trans_reserve(tp, 0,
+ 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_ILOCK_EXCL);
+ xfs_trans_ihold(tp, ip);
+
+ XFS_BMAP_INIT(&free_list, &first_block);
+
+ nimaps = XFS_STRAT_WRITE_IMAPS;
+ /*
+ * Ensure we don't go beyond eof - it is possible
+ * the extents changed since we did the read call,
+ * we dropped the ilock in the interim.
+ */
+
+ end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size);
+ xfs_bmap_last_offset(NULL, ip, &last_block,
+ XFS_DATA_FORK);
+ 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 */
+ 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,
+ first_block, &committed);
+ if (error)
+ goto trans_cancel;
+
+ error = xfs_trans_commit(tp,
+ XFS_TRANS_RELEASE_LOG_RES, NULL);
+ 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
+ */
+
+ for (i = 0; i < nimaps; i++) {
+ if ( !(io->io_flags & XFS_IOCORE_RT) &&
+ !imap[i].br_startblock) {
+ cmn_err(CE_PANIC,"Access to block zero: "
+ "fs <%s> inode: %lld "
+ "start_block : %llx start_off : %llx "
+ "blkcnt : %llx extent-state : %x \n",
+ (ip->i_mount)->m_fsname,
+ (long long)ip->i_ino,
+ imap[i].br_startblock,
+ imap[i].br_startoff,
+ imap[i].br_blockcount,imap[i].br_state);
+ }
+ if ((map->br_startoff >= imap[i].br_startoff) &&
+ (map->br_startoff < (imap[i].br_startoff +
+ imap[i].br_blockcount))) {
+ *map = imap[i];
+ *retmap = 1;
+ XFS_STATS_INC(xs_xstrat_quick);
+ return 0;
+ }
+ count_fsb -= imap[i].br_blockcount;
+ }
+
+ /* So far we have not mapped the requested part of the
+ * file, just surrounding data, try again.
+ */
+ nimaps--;
+ offset_fsb = imap[nimaps].br_startoff +
+ imap[nimaps].br_blockcount;
+ map_start_fsb = offset_fsb;
+ }
+
+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,
+ loff_t offset,
+ size_t count)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_iocore_t *io = &ip->i_iocore;
+ xfs_trans_t *tp;
+ xfs_fileoff_t offset_fsb;
+ xfs_filblks_t count_fsb;
+ xfs_filblks_t numblks_fsb;
+ xfs_bmbt_irec_t imap;
+ int committed;
+ int error;
+ int nres;
+ int nimaps;
+ xfs_fsblock_t firstfsb;
+ xfs_bmap_free_t free_list;
+
+ xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
+ &ip->i_iocore, 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);
+
+ do {
+ nres = XFS_DIOSTRAT_SPACE_RES(mp, 0);
+
+ /*
+ * 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.
+ */
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
+ 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);
+ goto error0;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+ xfs_trans_ihold(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, &firstfsb,
+ 1, &imap, &nimaps, &free_list);
+ if (error)
+ goto error_on_bmapi_transaction;
+
+ error = xfs_bmap_finish(&(tp), &(free_list),
+ firstfsb, &committed);
+ if (error)
+ goto error_on_bmapi_transaction;
+
+ error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ if (error)
+ goto error0;
+
+ if ( !(io->io_flags & XFS_IOCORE_RT) && !imap.br_startblock) {
+ cmn_err(CE_PANIC,"Access to block zero: fs <%s> "
+ "inode: %lld start_block : %llx start_off : "
+ "%llx blkcnt : %llx extent-state : %x \n",
+ (ip->i_mount)->m_fsname,
+ (long long)ip->i_ino,
+ imap.br_startblock,imap.br_startoff,
+ imap.br_blockcount,imap.br_state);
+ }
+
+ 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);
+error0:
+ return XFS_ERROR(error);
+}