2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "xfs_trans.h"
27 #include "xfs_alloc.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_quota.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_attr_sf.h"
36 #include "xfs_dinode.h"
37 #include "xfs_inode.h"
39 #include "xfs_btree.h"
40 #include "xfs_ialloc.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_itable.h"
47 #include "xfs_inode_item.h"
48 #include "xfs_buf_item.h"
49 #include "xfs_utils.h"
50 #include "xfs_iomap.h"
51 #include "xfs_vnodeops.h"
53 #include <linux/capability.h>
54 #include <linux/writeback.h>
57 #if defined(XFS_RW_TRACE)
67 if (ip->i_rwtrace == NULL)
69 ktrace_enter(ip->i_rwtrace,
70 (void *)(unsigned long)tag,
72 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
73 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
75 (void *)((unsigned long)segs),
76 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
77 (void *)((unsigned long)(offset & 0xffffffff)),
78 (void *)((unsigned long)ioflags),
79 (void *)((unsigned long)((ip->i_new_size >> 32) & 0xffffffff)),
80 (void *)((unsigned long)(ip->i_new_size & 0xffffffff)),
81 (void *)((unsigned long)current_pid()),
89 xfs_inval_cached_trace(
97 if (ip->i_rwtrace == NULL)
99 ktrace_enter(ip->i_rwtrace,
100 (void *)(__psint_t)XFS_INVAL_CACHED,
102 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
103 (void *)((unsigned long)(offset & 0xffffffff)),
104 (void *)((unsigned long)((len >> 32) & 0xffffffff)),
105 (void *)((unsigned long)(len & 0xffffffff)),
106 (void *)((unsigned long)((first >> 32) & 0xffffffff)),
107 (void *)((unsigned long)(first & 0xffffffff)),
108 (void *)((unsigned long)((last >> 32) & 0xffffffff)),
109 (void *)((unsigned long)(last & 0xffffffff)),
110 (void *)((unsigned long)current_pid()),
122 * xfs_iozero clears the specified range of buffer supplied,
123 * and marks all the affected blocks as valid and modified. If
124 * an affected block is not allocated, it will be allocated. If
125 * an affected block is not completely overwritten, and is not
126 * valid before the operation, it will be read from disk before
127 * being partially zeroed.
131 struct xfs_inode *ip, /* inode */
132 loff_t pos, /* offset in file */
133 size_t count) /* size of data to zero */
136 struct address_space *mapping;
139 mapping = ip->i_vnode->i_mapping;
141 unsigned offset, bytes;
144 offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
145 bytes = PAGE_CACHE_SIZE - offset;
149 status = pagecache_write_begin(NULL, mapping, pos, bytes,
150 AOP_FLAG_UNINTERRUPTIBLE,
155 zero_user(page, offset, bytes);
157 status = pagecache_write_end(NULL, mapping, pos, bytes, bytes,
159 WARN_ON(status <= 0); /* can't return less than zero! */
168 ssize_t /* bytes read, or (-) error */
172 const struct iovec *iovp,
177 struct file *file = iocb->ki_filp;
178 struct inode *inode = file->f_mapping->host;
179 xfs_mount_t *mp = ip->i_mount;
186 XFS_STATS_INC(xs_read_calls);
188 /* START copy & waste from filemap.c */
189 for (seg = 0; seg < segs; seg++) {
190 const struct iovec *iv = &iovp[seg];
193 * If any segment has a negative length, or the cumulative
194 * length ever wraps negative then return -EINVAL.
197 if (unlikely((ssize_t)(size|iv->iov_len) < 0))
198 return XFS_ERROR(-EINVAL);
200 /* END copy & waste from filemap.c */
202 if (unlikely(ioflags & IO_ISDIRECT)) {
203 xfs_buftarg_t *target =
204 XFS_IS_REALTIME_INODE(ip) ?
205 mp->m_rtdev_targp : mp->m_ddev_targp;
206 if ((*offset & target->bt_smask) ||
207 (size & target->bt_smask)) {
208 if (*offset == ip->i_size) {
211 return -XFS_ERROR(EINVAL);
215 n = XFS_MAXIOFFSET(mp) - *offset;
216 if ((n <= 0) || (size == 0))
222 if (XFS_FORCED_SHUTDOWN(mp))
225 if (unlikely(ioflags & IO_ISDIRECT))
226 mutex_lock(&inode->i_mutex);
227 xfs_ilock(ip, XFS_IOLOCK_SHARED);
229 if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
230 int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags);
231 int iolock = XFS_IOLOCK_SHARED;
233 ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size,
236 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
237 if (unlikely(ioflags & IO_ISDIRECT))
238 mutex_unlock(&inode->i_mutex);
243 if (unlikely(ioflags & IO_ISDIRECT)) {
244 if (inode->i_mapping->nrpages)
245 ret = xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK),
246 -1, FI_REMAPF_LOCKED);
247 mutex_unlock(&inode->i_mutex);
249 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
254 xfs_rw_enter_trace(XFS_READ_ENTER, ip,
255 (void *)iovp, segs, *offset, ioflags);
257 iocb->ki_pos = *offset;
258 ret = generic_file_aio_read(iocb, iovp, segs, *offset);
259 if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO))
260 ret = wait_on_sync_kiocb(iocb);
262 XFS_STATS_ADD(xs_read_bytes, ret);
264 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
273 struct pipe_inode_info *pipe,
278 xfs_mount_t *mp = ip->i_mount;
281 XFS_STATS_INC(xs_read_calls);
282 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
285 xfs_ilock(ip, XFS_IOLOCK_SHARED);
287 if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
288 int iolock = XFS_IOLOCK_SHARED;
291 error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *ppos, count,
292 FILP_DELAY_FLAG(infilp), &iolock);
294 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
298 xfs_rw_enter_trace(XFS_SPLICE_READ_ENTER, ip,
299 pipe, count, *ppos, ioflags);
300 ret = generic_file_splice_read(infilp, ppos, pipe, count, flags);
302 XFS_STATS_ADD(xs_read_bytes, ret);
304 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
311 struct pipe_inode_info *pipe,
312 struct file *outfilp,
318 xfs_mount_t *mp = ip->i_mount;
320 struct inode *inode = outfilp->f_mapping->host;
321 xfs_fsize_t isize, new_size;
323 XFS_STATS_INC(xs_write_calls);
324 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
327 xfs_ilock(ip, XFS_IOLOCK_EXCL);
329 if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) {
330 int iolock = XFS_IOLOCK_EXCL;
333 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, *ppos, count,
334 FILP_DELAY_FLAG(outfilp), &iolock);
336 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
341 new_size = *ppos + count;
343 xfs_ilock(ip, XFS_ILOCK_EXCL);
344 if (new_size > ip->i_size)
345 ip->i_new_size = new_size;
346 xfs_iunlock(ip, XFS_ILOCK_EXCL);
348 xfs_rw_enter_trace(XFS_SPLICE_WRITE_ENTER, ip,
349 pipe, count, *ppos, ioflags);
350 ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
352 XFS_STATS_ADD(xs_write_bytes, ret);
354 isize = i_size_read(inode);
355 if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize))
358 if (*ppos > ip->i_size) {
359 xfs_ilock(ip, XFS_ILOCK_EXCL);
360 if (*ppos > ip->i_size)
362 xfs_iunlock(ip, XFS_ILOCK_EXCL);
365 if (ip->i_new_size) {
366 xfs_ilock(ip, XFS_ILOCK_EXCL);
368 if (ip->i_d.di_size > ip->i_size)
369 ip->i_d.di_size = ip->i_size;
370 xfs_iunlock(ip, XFS_ILOCK_EXCL);
372 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
377 * This routine is called to handle zeroing any space in the last
378 * block of the file that is beyond the EOF. We do this since the
379 * size is being increased without writing anything to that block
380 * and we don't want anyone to read the garbage on the disk.
382 STATIC int /* error (positive) */
388 xfs_fileoff_t last_fsb;
389 xfs_mount_t *mp = ip->i_mount;
394 xfs_bmbt_irec_t imap;
396 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
398 zero_offset = XFS_B_FSB_OFFSET(mp, isize);
399 if (zero_offset == 0) {
401 * There are no extra bytes in the last block on disk to
407 last_fsb = XFS_B_TO_FSBT(mp, isize);
409 error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap,
410 &nimaps, NULL, NULL);
416 * If the block underlying isize is just a hole, then there
417 * is nothing to zero.
419 if (imap.br_startblock == HOLESTARTBLOCK) {
423 * Zero the part of the last block beyond the EOF, and write it
424 * out sync. We need to drop the ilock while we do this so we
425 * don't deadlock when the buffer cache calls back to us.
427 xfs_iunlock(ip, XFS_ILOCK_EXCL| XFS_EXTSIZE_RD);
429 zero_len = mp->m_sb.sb_blocksize - zero_offset;
430 if (isize + zero_len > offset)
431 zero_len = offset - isize;
432 error = xfs_iozero(ip, isize, zero_len);
434 xfs_ilock(ip, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
440 * Zero any on disk space between the current EOF and the new,
441 * larger EOF. This handles the normal case of zeroing the remainder
442 * of the last block in the file and the unusual case of zeroing blocks
443 * out beyond the size of the file. This second case only happens
444 * with fixed size extents and when the system crashes before the inode
445 * size was updated but after blocks were allocated. If fill is set,
446 * then any holes in the range are filled and zeroed. If not, the holes
447 * are left alone as holes.
450 int /* error (positive) */
453 xfs_off_t offset, /* starting I/O offset */
454 xfs_fsize_t isize) /* current inode size */
456 xfs_mount_t *mp = ip->i_mount;
457 xfs_fileoff_t start_zero_fsb;
458 xfs_fileoff_t end_zero_fsb;
459 xfs_fileoff_t zero_count_fsb;
460 xfs_fileoff_t last_fsb;
461 xfs_fileoff_t zero_off;
462 xfs_fsize_t zero_len;
465 xfs_bmbt_irec_t imap;
467 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
468 ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE));
469 ASSERT(offset > isize);
472 * First handle zeroing the block on which isize resides.
473 * We only zero a part of that block so it is handled specially.
475 error = xfs_zero_last_block(ip, offset, isize);
477 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
478 ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE));
483 * Calculate the range between the new size and the old
484 * where blocks needing to be zeroed may exist. To get the
485 * block where the last byte in the file currently resides,
486 * we need to subtract one from the size and truncate back
487 * to a block boundary. We subtract 1 in case the size is
488 * exactly on a block boundary.
490 last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
491 start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
492 end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
493 ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
494 if (last_fsb == end_zero_fsb) {
496 * The size was only incremented on its last block.
497 * We took care of that above, so just return.
502 ASSERT(start_zero_fsb <= end_zero_fsb);
503 while (start_zero_fsb <= end_zero_fsb) {
505 zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
506 error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb,
507 0, NULL, 0, &imap, &nimaps, NULL, NULL);
509 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
510 ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE));
515 if (imap.br_state == XFS_EXT_UNWRITTEN ||
516 imap.br_startblock == HOLESTARTBLOCK) {
518 * This loop handles initializing pages that were
519 * partially initialized by the code below this
520 * loop. It basically zeroes the part of the page
521 * that sits on a hole and sets the page as P_HOLE
522 * and calls remapf if it is a mapped file.
524 start_zero_fsb = imap.br_startoff + imap.br_blockcount;
525 ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
530 * There are blocks we need to zero.
531 * Drop the inode lock while we're doing the I/O.
532 * We'll still have the iolock to protect us.
534 xfs_iunlock(ip, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
536 zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
537 zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);
539 if ((zero_off + zero_len) > offset)
540 zero_len = offset - zero_off;
542 error = xfs_iozero(ip, zero_off, zero_len);
547 start_zero_fsb = imap.br_startoff + imap.br_blockcount;
548 ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
550 xfs_ilock(ip, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
556 xfs_ilock(ip, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
561 ssize_t /* bytes written, or (-) error */
563 struct xfs_inode *xip,
565 const struct iovec *iovp,
570 struct file *file = iocb->ki_filp;
571 struct address_space *mapping = file->f_mapping;
572 struct inode *inode = mapping->host;
573 unsigned long segs = nsegs;
575 ssize_t ret = 0, error = 0;
576 xfs_fsize_t isize, new_size;
579 size_t ocount = 0, count;
583 XFS_STATS_INC(xs_write_calls);
585 error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ);
597 xfs_wait_for_freeze(mp, SB_FREEZE_WRITE);
599 if (XFS_FORCED_SHUTDOWN(mp))
603 if (ioflags & IO_ISDIRECT) {
604 iolock = XFS_IOLOCK_SHARED;
607 iolock = XFS_IOLOCK_EXCL;
609 mutex_lock(&inode->i_mutex);
612 xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
615 error = -generic_write_checks(file, &pos, &count,
616 S_ISBLK(inode->i_mode));
618 xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
619 goto out_unlock_mutex;
622 if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) &&
623 !(ioflags & IO_INVIS) && !eventsent)) {
624 int dmflags = FILP_DELAY_FLAG(file);
627 dmflags |= DM_FLAGS_IMUX;
629 xfs_iunlock(xip, XFS_ILOCK_EXCL);
630 error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip,
631 pos, count, dmflags, &iolock);
633 goto out_unlock_internal;
635 xfs_ilock(xip, XFS_ILOCK_EXCL);
639 * The iolock was dropped and reacquired in XFS_SEND_DATA
640 * so we have to recheck the size when appending.
641 * We will only "goto start;" once, since having sent the
642 * event prevents another call to XFS_SEND_DATA, which is
643 * what allows the size to change in the first place.
645 if ((file->f_flags & O_APPEND) && pos != xip->i_size)
649 if (ioflags & IO_ISDIRECT) {
650 xfs_buftarg_t *target =
651 XFS_IS_REALTIME_INODE(xip) ?
652 mp->m_rtdev_targp : mp->m_ddev_targp;
654 if ((pos & target->bt_smask) || (count & target->bt_smask)) {
655 xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
656 return XFS_ERROR(-EINVAL);
659 if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) {
660 xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
661 iolock = XFS_IOLOCK_EXCL;
663 mutex_lock(&inode->i_mutex);
664 xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
669 new_size = pos + count;
670 if (new_size > xip->i_size)
671 xip->i_new_size = new_size;
673 if (likely(!(ioflags & IO_INVIS))) {
674 file_update_time(file);
675 xfs_ichgtime_fast(xip, inode,
676 XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
680 * If the offset is beyond the size of the file, we have a couple
681 * of things to do. First, if there is already space allocated
682 * we need to either create holes or zero the disk or ...
684 * If there is a page where the previous size lands, we need
685 * to zero it out up to the new size.
688 if (pos > xip->i_size) {
689 error = xfs_zero_eof(xip, pos, xip->i_size);
691 xfs_iunlock(xip, XFS_ILOCK_EXCL);
692 goto out_unlock_internal;
695 xfs_iunlock(xip, XFS_ILOCK_EXCL);
698 * If we're writing the file then make sure to clear the
699 * setuid and setgid bits if the process is not being run
700 * by root. This keeps people from modifying setuid and
704 if (((xip->i_d.di_mode & S_ISUID) ||
705 ((xip->i_d.di_mode & (S_ISGID | S_IXGRP)) ==
706 (S_ISGID | S_IXGRP))) &&
707 !capable(CAP_FSETID)) {
708 error = xfs_write_clear_setuid(xip);
710 error = -remove_suid(file->f_path.dentry);
711 if (unlikely(error)) {
712 goto out_unlock_internal;
717 /* We can write back this queue in page reclaim */
718 current->backing_dev_info = mapping->backing_dev_info;
720 if ((ioflags & IO_ISDIRECT)) {
721 if (mapping->nrpages) {
722 WARN_ON(need_i_mutex == 0);
723 xfs_inval_cached_trace(xip, pos, -1,
724 (pos & PAGE_CACHE_MASK), -1);
725 error = xfs_flushinval_pages(xip,
726 (pos & PAGE_CACHE_MASK),
727 -1, FI_REMAPF_LOCKED);
729 goto out_unlock_internal;
733 /* demote the lock now the cached pages are gone */
734 xfs_ilock_demote(xip, XFS_IOLOCK_EXCL);
735 mutex_unlock(&inode->i_mutex);
737 iolock = XFS_IOLOCK_SHARED;
741 xfs_rw_enter_trace(XFS_DIOWR_ENTER, xip, (void *)iovp, segs,
743 ret = generic_file_direct_write(iocb, iovp,
744 &segs, pos, offset, count, ocount);
747 * direct-io write to a hole: fall through to buffered I/O
748 * for completing the rest of the request.
750 if (ret >= 0 && ret != count) {
751 XFS_STATS_ADD(xs_write_bytes, ret);
756 ioflags &= ~IO_ISDIRECT;
757 xfs_iunlock(xip, iolock);
761 xfs_rw_enter_trace(XFS_WRITE_ENTER, xip, (void *)iovp, segs,
763 ret = generic_file_buffered_write(iocb, iovp, segs,
764 pos, offset, count, ret);
767 current->backing_dev_info = NULL;
769 if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO))
770 ret = wait_on_sync_kiocb(iocb);
772 if (ret == -ENOSPC &&
773 DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
774 xfs_iunlock(xip, iolock);
776 mutex_unlock(&inode->i_mutex);
777 error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip,
778 DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL,
779 0, 0, 0); /* Delay flag intentionally unused */
781 mutex_lock(&inode->i_mutex);
782 xfs_ilock(xip, iolock);
784 goto out_unlock_internal;
790 isize = i_size_read(inode);
791 if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
794 if (*offset > xip->i_size) {
795 xfs_ilock(xip, XFS_ILOCK_EXCL);
796 if (*offset > xip->i_size)
797 xip->i_size = *offset;
798 xfs_iunlock(xip, XFS_ILOCK_EXCL);
803 goto out_unlock_internal;
805 XFS_STATS_ADD(xs_write_bytes, ret);
807 /* Handle various SYNC-type writes */
808 if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) {
811 xfs_iunlock(xip, iolock);
813 mutex_unlock(&inode->i_mutex);
814 error2 = sync_page_range(inode, mapping, pos, ret);
818 mutex_lock(&inode->i_mutex);
819 xfs_ilock(xip, iolock);
820 error2 = xfs_write_sync_logforce(mp, xip);
826 if (xip->i_new_size) {
827 xfs_ilock(xip, XFS_ILOCK_EXCL);
830 * If this was a direct or synchronous I/O that failed (such
831 * as ENOSPC) then part of the I/O may have been written to
832 * disk before the error occured. In this case the on-disk
833 * file size may have been adjusted beyond the in-memory file
834 * size and now needs to be truncated back.
836 if (xip->i_d.di_size > xip->i_size)
837 xip->i_d.di_size = xip->i_size;
838 xfs_iunlock(xip, XFS_ILOCK_EXCL);
840 xfs_iunlock(xip, iolock);
843 mutex_unlock(&inode->i_mutex);
848 * All xfs metadata buffers except log state machine buffers
849 * get this attached as their b_bdstrat callback function.
850 * This is so that we can catch a buffer
851 * after prematurely unpinning it to forcibly shutdown the filesystem.
854 xfs_bdstrat_cb(struct xfs_buf *bp)
858 mp = XFS_BUF_FSPRIVATE3(bp, xfs_mount_t *);
859 if (!XFS_FORCED_SHUTDOWN(mp)) {
860 xfs_buf_iorequest(bp);
863 xfs_buftrace("XFS__BDSTRAT IOERROR", bp);
865 * Metadata write that didn't get logged but
866 * written delayed anyway. These aren't associated
867 * with a transaction, and can be ignored.
869 if (XFS_BUF_IODONE_FUNC(bp) == NULL &&
870 (XFS_BUF_ISREAD(bp)) == 0)
871 return (xfs_bioerror_relse(bp));
873 return (xfs_bioerror(bp));
878 * Wrapper around bdstrat so that we can stop data from going to disk in case
879 * we are shutting down the filesystem. Typically user data goes thru this
880 * path; one of the exceptions is the superblock.
884 struct xfs_mount *mp,
888 if (!XFS_FORCED_SHUTDOWN(mp))
889 xfs_buf_iorequest(bp);
891 xfs_buftrace("XFSBDSTRAT IOERROR", bp);
892 xfs_bioerror_relse(bp);
896 * If the underlying (data/log/rt) device is readonly, there are some
897 * operations that cannot proceed.
900 xfs_dev_is_read_only(
904 if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
905 xfs_readonly_buftarg(mp->m_logdev_targp) ||
906 (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
908 "XFS: %s required on read-only device.", message);
910 "XFS: write access unavailable, cannot proceed.");