2 * Copyright (c) 2000-2005 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
25 #include "xfs_trans.h"
26 #include "xfs_mount.h"
27 #include "xfs_bmap_btree.h"
28 #include "xfs_alloc.h"
29 #include "xfs_dinode.h"
30 #include "xfs_inode.h"
31 #include "xfs_inode_item.h"
33 #include "xfs_error.h"
34 #include "xfs_vnodeops.h"
35 #include "xfs_da_btree.h"
36 #include "xfs_ioctl.h"
37 #include "xfs_trace.h"
39 #include <linux/dcache.h>
40 #include <linux/falloc.h>
42 static const struct vm_operations_struct xfs_file_vm_ops;
45 * Locking primitives for read and write IO paths to ensure we consistently use
46 * and order the inode->i_mutex, ip->i_lock and ip->i_iolock.
53 if (type & XFS_IOLOCK_EXCL)
54 mutex_lock(&VFS_I(ip)->i_mutex);
63 xfs_iunlock(ip, type);
64 if (type & XFS_IOLOCK_EXCL)
65 mutex_unlock(&VFS_I(ip)->i_mutex);
73 xfs_ilock_demote(ip, type);
74 if (type & XFS_IOLOCK_EXCL)
75 mutex_unlock(&VFS_I(ip)->i_mutex);
81 * xfs_iozero clears the specified range of buffer supplied,
82 * and marks all the affected blocks as valid and modified. If
83 * an affected block is not allocated, it will be allocated. If
84 * an affected block is not completely overwritten, and is not
85 * valid before the operation, it will be read from disk before
86 * being partially zeroed.
90 struct xfs_inode *ip, /* inode */
91 loff_t pos, /* offset in file */
92 size_t count) /* size of data to zero */
95 struct address_space *mapping;
98 mapping = VFS_I(ip)->i_mapping;
100 unsigned offset, bytes;
103 offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
104 bytes = PAGE_CACHE_SIZE - offset;
108 status = pagecache_write_begin(NULL, mapping, pos, bytes,
109 AOP_FLAG_UNINTERRUPTIBLE,
114 zero_user(page, offset, bytes);
116 status = pagecache_write_end(NULL, mapping, pos, bytes, bytes,
118 WARN_ON(status <= 0); /* can't return less than zero! */
128 * Fsync operations on directories are much simpler than on regular files,
129 * as there is no file data to flush, and thus also no need for explicit
130 * cache flush operations, and there are no non-transaction metadata updates
131 * on directories either.
140 struct xfs_inode *ip = XFS_I(file->f_mapping->host);
141 struct xfs_mount *mp = ip->i_mount;
144 trace_xfs_dir_fsync(ip);
146 xfs_ilock(ip, XFS_ILOCK_SHARED);
147 if (xfs_ipincount(ip))
148 lsn = ip->i_itemp->ili_last_lsn;
149 xfs_iunlock(ip, XFS_ILOCK_SHARED);
153 return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL);
163 struct inode *inode = file->f_mapping->host;
164 struct xfs_inode *ip = XFS_I(inode);
165 struct xfs_mount *mp = ip->i_mount;
166 struct xfs_trans *tp;
171 trace_xfs_file_fsync(ip);
173 error = filemap_write_and_wait_range(inode->i_mapping, start, end);
177 if (XFS_FORCED_SHUTDOWN(mp))
178 return -XFS_ERROR(EIO);
180 xfs_iflags_clear(ip, XFS_ITRUNCATED);
182 if (mp->m_flags & XFS_MOUNT_BARRIER) {
184 * If we have an RT and/or log subvolume we need to make sure
185 * to flush the write cache the device used for file data
186 * first. This is to ensure newly written file data make
187 * it to disk before logging the new inode size in case of
188 * an extending write.
190 if (XFS_IS_REALTIME_INODE(ip))
191 xfs_blkdev_issue_flush(mp->m_rtdev_targp);
192 else if (mp->m_logdev_targp != mp->m_ddev_targp)
193 xfs_blkdev_issue_flush(mp->m_ddev_targp);
197 * We always need to make sure that the required inode state is safe on
198 * disk. The inode might be clean but we still might need to force the
199 * log because of committed transactions that haven't hit the disk yet.
200 * Likewise, there could be unflushed non-transactional changes to the
201 * inode core that have to go to disk and this requires us to issue
202 * a synchronous transaction to capture these changes correctly.
204 * This code relies on the assumption that if the i_update_core field
205 * of the inode is clear and the inode is unpinned then it is clean
206 * and no action is required.
208 xfs_ilock(ip, XFS_ILOCK_SHARED);
211 * First check if the VFS inode is marked dirty. All the dirtying
212 * of non-transactional updates no goes through mark_inode_dirty*,
213 * which allows us to distinguish beteeen pure timestamp updates
214 * and i_size updates which need to be caught for fdatasync.
215 * After that also theck for the dirty state in the XFS inode, which
216 * might gets cleared when the inode gets written out via the AIL
217 * or xfs_iflush_cluster.
219 if (((inode->i_state & I_DIRTY_DATASYNC) ||
220 ((inode->i_state & I_DIRTY_SYNC) && !datasync)) &&
223 * Kick off a transaction to log the inode core to get the
224 * updates. The sync transaction will also force the log.
226 xfs_iunlock(ip, XFS_ILOCK_SHARED);
227 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
228 error = xfs_trans_reserve(tp, 0,
229 XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
231 xfs_trans_cancel(tp, 0);
234 xfs_ilock(ip, XFS_ILOCK_EXCL);
237 * Note - it's possible that we might have pushed ourselves out
238 * of the way during trans_reserve which would flush the inode.
239 * But there's no guarantee that the inode buffer has actually
240 * gone out yet (it's delwri). Plus the buffer could be pinned
241 * anyway if it's part of an inode in another recent
242 * transaction. So we play it safe and fire off the
243 * transaction anyway.
245 xfs_trans_ijoin(tp, ip, 0);
246 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
247 error = xfs_trans_commit(tp, 0);
249 lsn = ip->i_itemp->ili_last_lsn;
250 xfs_iunlock(ip, XFS_ILOCK_EXCL);
253 * Timestamps/size haven't changed since last inode flush or
254 * inode transaction commit. That means either nothing got
255 * written or a transaction committed which caught the updates.
256 * If the latter happened and the transaction hasn't hit the
257 * disk yet, the inode will be still be pinned. If it is,
260 if (xfs_ipincount(ip))
261 lsn = ip->i_itemp->ili_last_lsn;
262 xfs_iunlock(ip, XFS_ILOCK_SHARED);
266 error = _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, &log_flushed);
269 * If we only have a single device, and the log force about was
270 * a no-op we might have to flush the data device cache here.
271 * This can only happen for fdatasync/O_DSYNC if we were overwriting
272 * an already allocated file and thus do not have any metadata to
275 if ((mp->m_flags & XFS_MOUNT_BARRIER) &&
276 mp->m_logdev_targp == mp->m_ddev_targp &&
277 !XFS_IS_REALTIME_INODE(ip) &&
279 xfs_blkdev_issue_flush(mp->m_ddev_targp);
287 const struct iovec *iovp,
288 unsigned long nr_segs,
291 struct file *file = iocb->ki_filp;
292 struct inode *inode = file->f_mapping->host;
293 struct xfs_inode *ip = XFS_I(inode);
294 struct xfs_mount *mp = ip->i_mount;
301 XFS_STATS_INC(xs_read_calls);
303 BUG_ON(iocb->ki_pos != pos);
305 if (unlikely(file->f_flags & O_DIRECT))
306 ioflags |= IO_ISDIRECT;
307 if (file->f_mode & FMODE_NOCMTIME)
310 /* START copy & waste from filemap.c */
311 for (seg = 0; seg < nr_segs; seg++) {
312 const struct iovec *iv = &iovp[seg];
315 * If any segment has a negative length, or the cumulative
316 * length ever wraps negative then return -EINVAL.
319 if (unlikely((ssize_t)(size|iv->iov_len) < 0))
320 return XFS_ERROR(-EINVAL);
322 /* END copy & waste from filemap.c */
324 if (unlikely(ioflags & IO_ISDIRECT)) {
325 xfs_buftarg_t *target =
326 XFS_IS_REALTIME_INODE(ip) ?
327 mp->m_rtdev_targp : mp->m_ddev_targp;
328 if ((iocb->ki_pos & target->bt_smask) ||
329 (size & target->bt_smask)) {
330 if (iocb->ki_pos == ip->i_size)
332 return -XFS_ERROR(EINVAL);
336 n = XFS_MAXIOFFSET(mp) - iocb->ki_pos;
337 if (n <= 0 || size == 0)
343 if (XFS_FORCED_SHUTDOWN(mp))
347 * Locking is a bit tricky here. If we take an exclusive lock
348 * for direct IO, we effectively serialise all new concurrent
349 * read IO to this file and block it behind IO that is currently in
350 * progress because IO in progress holds the IO lock shared. We only
351 * need to hold the lock exclusive to blow away the page cache, so
352 * only take lock exclusively if the page cache needs invalidation.
353 * This allows the normal direct IO case of no page cache pages to
354 * proceeed concurrently without serialisation.
356 xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
357 if ((ioflags & IO_ISDIRECT) && inode->i_mapping->nrpages) {
358 xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
359 xfs_rw_ilock(ip, XFS_IOLOCK_EXCL);
361 if (inode->i_mapping->nrpages) {
362 ret = -xfs_flushinval_pages(ip,
363 (iocb->ki_pos & PAGE_CACHE_MASK),
364 -1, FI_REMAPF_LOCKED);
366 xfs_rw_iunlock(ip, XFS_IOLOCK_EXCL);
370 xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
373 trace_xfs_file_read(ip, size, iocb->ki_pos, ioflags);
375 ret = generic_file_aio_read(iocb, iovp, nr_segs, iocb->ki_pos);
377 XFS_STATS_ADD(xs_read_bytes, ret);
379 xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
384 xfs_file_splice_read(
387 struct pipe_inode_info *pipe,
391 struct xfs_inode *ip = XFS_I(infilp->f_mapping->host);
395 XFS_STATS_INC(xs_read_calls);
397 if (infilp->f_mode & FMODE_NOCMTIME)
400 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
403 xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
405 trace_xfs_file_splice_read(ip, count, *ppos, ioflags);
407 ret = generic_file_splice_read(infilp, ppos, pipe, count, flags);
409 XFS_STATS_ADD(xs_read_bytes, ret);
411 xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
416 xfs_aio_write_isize_update(
419 ssize_t bytes_written)
421 struct xfs_inode *ip = XFS_I(inode);
422 xfs_fsize_t isize = i_size_read(inode);
424 if (bytes_written > 0)
425 XFS_STATS_ADD(xs_write_bytes, bytes_written);
427 if (unlikely(bytes_written < 0 && bytes_written != -EFAULT &&
431 if (*ppos > ip->i_size) {
432 xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
433 if (*ppos > ip->i_size)
435 xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
440 * If this was a direct or synchronous I/O that failed (such as ENOSPC) then
441 * part of the I/O may have been written to disk before the error occurred. In
442 * this case the on-disk file size may have been adjusted beyond the in-memory
443 * file size and now needs to be truncated back.
446 xfs_aio_write_newsize_update(
447 struct xfs_inode *ip,
448 xfs_fsize_t new_size)
450 if (new_size == ip->i_new_size) {
451 xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
452 if (new_size == ip->i_new_size)
454 if (ip->i_d.di_size > ip->i_size)
455 ip->i_d.di_size = ip->i_size;
456 xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
461 * xfs_file_splice_write() does not use xfs_rw_ilock() because
462 * generic_file_splice_write() takes the i_mutex itself. This, in theory,
463 * couuld cause lock inversions between the aio_write path and the splice path
464 * if someone is doing concurrent splice(2) based writes and write(2) based
465 * writes to the same inode. The only real way to fix this is to re-implement
466 * the generic code here with correct locking orders.
469 xfs_file_splice_write(
470 struct pipe_inode_info *pipe,
471 struct file *outfilp,
476 struct inode *inode = outfilp->f_mapping->host;
477 struct xfs_inode *ip = XFS_I(inode);
478 xfs_fsize_t new_size;
482 XFS_STATS_INC(xs_write_calls);
484 if (outfilp->f_mode & FMODE_NOCMTIME)
487 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
490 xfs_ilock(ip, XFS_IOLOCK_EXCL);
492 new_size = *ppos + count;
494 xfs_ilock(ip, XFS_ILOCK_EXCL);
495 if (new_size > ip->i_size)
496 ip->i_new_size = new_size;
497 xfs_iunlock(ip, XFS_ILOCK_EXCL);
499 trace_xfs_file_splice_write(ip, count, *ppos, ioflags);
501 ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
503 xfs_aio_write_isize_update(inode, ppos, ret);
504 xfs_aio_write_newsize_update(ip, new_size);
505 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
510 * This routine is called to handle zeroing any space in the last
511 * block of the file that is beyond the EOF. We do this since the
512 * size is being increased without writing anything to that block
513 * and we don't want anyone to read the garbage on the disk.
515 STATIC int /* error (positive) */
522 xfs_fileoff_t last_fsb;
523 xfs_mount_t *mp = ip->i_mount;
528 xfs_bmbt_irec_t imap;
530 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
532 zero_offset = XFS_B_FSB_OFFSET(mp, isize);
533 if (zero_offset == 0) {
535 * There are no extra bytes in the last block on disk to
541 last_fsb = XFS_B_TO_FSBT(mp, isize);
543 error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0);
548 * If the block underlying isize is just a hole, then there
549 * is nothing to zero.
551 if (imap.br_startblock == HOLESTARTBLOCK) {
555 * Zero the part of the last block beyond the EOF, and write it
556 * out sync. We need to drop the ilock while we do this so we
557 * don't deadlock when the buffer cache calls back to us.
559 xfs_iunlock(ip, XFS_ILOCK_EXCL);
561 zero_len = mp->m_sb.sb_blocksize - zero_offset;
562 if (isize + zero_len > offset)
563 zero_len = offset - isize;
565 error = xfs_iozero(ip, isize, zero_len);
567 xfs_ilock(ip, XFS_ILOCK_EXCL);
573 * Zero any on disk space between the current EOF and the new,
574 * larger EOF. This handles the normal case of zeroing the remainder
575 * of the last block in the file and the unusual case of zeroing blocks
576 * out beyond the size of the file. This second case only happens
577 * with fixed size extents and when the system crashes before the inode
578 * size was updated but after blocks were allocated. If fill is set,
579 * then any holes in the range are filled and zeroed. If not, the holes
580 * are left alone as holes.
583 int /* error (positive) */
586 xfs_off_t offset, /* starting I/O offset */
587 xfs_fsize_t isize, /* current inode size */
590 xfs_mount_t *mp = ip->i_mount;
591 xfs_fileoff_t start_zero_fsb;
592 xfs_fileoff_t end_zero_fsb;
593 xfs_fileoff_t zero_count_fsb;
594 xfs_fileoff_t last_fsb;
595 xfs_fileoff_t zero_off;
596 xfs_fsize_t zero_len;
599 xfs_bmbt_irec_t imap;
601 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
602 ASSERT(offset > isize);
605 * First handle zeroing the block on which isize resides.
606 * We only zero a part of that block so it is handled specially.
608 error = xfs_zero_last_block(ip, offset, isize, did_zeroing);
610 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
615 * Calculate the range between the new size and the old
616 * where blocks needing to be zeroed may exist. To get the
617 * block where the last byte in the file currently resides,
618 * we need to subtract one from the size and truncate back
619 * to a block boundary. We subtract 1 in case the size is
620 * exactly on a block boundary.
622 last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
623 start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
624 end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
625 ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
626 if (last_fsb == end_zero_fsb) {
628 * The size was only incremented on its last block.
629 * We took care of that above, so just return.
634 ASSERT(start_zero_fsb <= end_zero_fsb);
635 while (start_zero_fsb <= end_zero_fsb) {
637 zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
638 error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb,
641 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
646 if (imap.br_state == XFS_EXT_UNWRITTEN ||
647 imap.br_startblock == HOLESTARTBLOCK) {
649 * This loop handles initializing pages that were
650 * partially initialized by the code below this
651 * loop. It basically zeroes the part of the page
652 * that sits on a hole and sets the page as P_HOLE
653 * and calls remapf if it is a mapped file.
655 start_zero_fsb = imap.br_startoff + imap.br_blockcount;
656 ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
661 * There are blocks we need to zero.
662 * Drop the inode lock while we're doing the I/O.
663 * We'll still have the iolock to protect us.
665 xfs_iunlock(ip, XFS_ILOCK_EXCL);
667 zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
668 zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);
670 if ((zero_off + zero_len) > offset)
671 zero_len = offset - zero_off;
673 error = xfs_iozero(ip, zero_off, zero_len);
679 start_zero_fsb = imap.br_startoff + imap.br_blockcount;
680 ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
682 xfs_ilock(ip, XFS_ILOCK_EXCL);
688 xfs_ilock(ip, XFS_ILOCK_EXCL);
694 * Common pre-write limit and setup checks.
696 * Returns with iolock held according to @iolock.
699 xfs_file_aio_write_checks(
703 xfs_fsize_t *new_sizep,
706 struct inode *inode = file->f_mapping->host;
707 struct xfs_inode *ip = XFS_I(inode);
708 xfs_fsize_t new_size;
711 xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
714 error = generic_write_checks(file, pos, count, S_ISBLK(inode->i_mode));
716 xfs_rw_iunlock(ip, XFS_ILOCK_EXCL | *iolock);
721 if (likely(!(file->f_mode & FMODE_NOCMTIME)))
722 file_update_time(file);
725 * If the offset is beyond the size of the file, we need to zero any
726 * blocks that fall between the existing EOF and the start of this
727 * write. There is no need to issue zeroing if another in-flght IO ends
728 * at or before this one If zeronig is needed and we are currently
729 * holding the iolock shared, we need to update it to exclusive which
730 * involves dropping all locks and relocking to maintain correct locking
731 * order. If we do this, restart the function to ensure all checks and
732 * values are still valid.
734 if ((ip->i_new_size && *pos > ip->i_new_size) ||
735 (!ip->i_new_size && *pos > ip->i_size)) {
738 if (*iolock == XFS_IOLOCK_SHARED) {
739 xfs_rw_iunlock(ip, XFS_ILOCK_EXCL | *iolock);
740 *iolock = XFS_IOLOCK_EXCL;
741 xfs_rw_ilock(ip, XFS_ILOCK_EXCL | *iolock);
744 error = -xfs_zero_eof(ip, *pos, ip->i_size, &zero);
748 * If this IO extends beyond EOF, we may need to update ip->i_new_size.
749 * We have already zeroed space beyond EOF (if necessary). Only update
750 * ip->i_new_size if this IO ends beyond any other in-flight writes.
752 new_size = *pos + *count;
753 if (new_size > ip->i_size) {
754 if (new_size > ip->i_new_size)
755 ip->i_new_size = new_size;
756 *new_sizep = new_size;
759 xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
764 * If we're writing the file then make sure to clear the setuid and
765 * setgid bits if the process is not being run by root. This keeps
766 * people from modifying setuid and setgid binaries.
768 return file_remove_suid(file);
773 * xfs_file_dio_aio_write - handle direct IO writes
775 * Lock the inode appropriately to prepare for and issue a direct IO write.
776 * By separating it from the buffered write path we remove all the tricky to
777 * follow locking changes and looping.
779 * If there are cached pages or we're extending the file, we need IOLOCK_EXCL
780 * until we're sure the bytes at the new EOF have been zeroed and/or the cached
781 * pages are flushed out.
783 * In most cases the direct IO writes will be done holding IOLOCK_SHARED
784 * allowing them to be done in parallel with reads and other direct IO writes.
785 * However, if the IO is not aligned to filesystem blocks, the direct IO layer
786 * needs to do sub-block zeroing and that requires serialisation against other
787 * direct IOs to the same block. In this case we need to serialise the
788 * submission of the unaligned IOs so that we don't get racing block zeroing in
789 * the dio layer. To avoid the problem with aio, we also need to wait for
790 * outstanding IOs to complete so that unwritten extent conversion is completed
791 * before we try to map the overlapping block. This is currently implemented by
792 * hitting it with a big hammer (i.e. inode_dio_wait()).
794 * Returns with locks held indicated by @iolock and errors indicated by
795 * negative return values.
798 xfs_file_dio_aio_write(
800 const struct iovec *iovp,
801 unsigned long nr_segs,
804 xfs_fsize_t *new_size,
807 struct file *file = iocb->ki_filp;
808 struct address_space *mapping = file->f_mapping;
809 struct inode *inode = mapping->host;
810 struct xfs_inode *ip = XFS_I(inode);
811 struct xfs_mount *mp = ip->i_mount;
813 size_t count = ocount;
814 int unaligned_io = 0;
815 struct xfs_buftarg *target = XFS_IS_REALTIME_INODE(ip) ?
816 mp->m_rtdev_targp : mp->m_ddev_targp;
819 if ((pos & target->bt_smask) || (count & target->bt_smask))
820 return -XFS_ERROR(EINVAL);
822 if ((pos & mp->m_blockmask) || ((pos + count) & mp->m_blockmask))
826 * We don't need to take an exclusive lock unless there page cache needs
827 * to be invalidated or unaligned IO is being executed. We don't need to
828 * consider the EOF extension case here because
829 * xfs_file_aio_write_checks() will relock the inode as necessary for
830 * EOF zeroing cases and fill out the new inode size as appropriate.
832 if (unaligned_io || mapping->nrpages)
833 *iolock = XFS_IOLOCK_EXCL;
835 *iolock = XFS_IOLOCK_SHARED;
836 xfs_rw_ilock(ip, *iolock);
839 * Recheck if there are cached pages that need invalidate after we got
840 * the iolock to protect against other threads adding new pages while
841 * we were waiting for the iolock.
843 if (mapping->nrpages && *iolock == XFS_IOLOCK_SHARED) {
844 xfs_rw_iunlock(ip, *iolock);
845 *iolock = XFS_IOLOCK_EXCL;
846 xfs_rw_ilock(ip, *iolock);
849 ret = xfs_file_aio_write_checks(file, &pos, &count, new_size, iolock);
853 if (mapping->nrpages) {
854 ret = -xfs_flushinval_pages(ip, (pos & PAGE_CACHE_MASK), -1,
861 * If we are doing unaligned IO, wait for all other IO to drain,
862 * otherwise demote the lock if we had to flush cached pages
865 inode_dio_wait(inode);
866 else if (*iolock == XFS_IOLOCK_EXCL) {
867 xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
868 *iolock = XFS_IOLOCK_SHARED;
871 trace_xfs_file_direct_write(ip, count, iocb->ki_pos, 0);
872 ret = generic_file_direct_write(iocb, iovp,
873 &nr_segs, pos, &iocb->ki_pos, count, ocount);
875 /* No fallback to buffered IO on errors for XFS. */
876 ASSERT(ret < 0 || ret == count);
881 xfs_file_buffered_aio_write(
883 const struct iovec *iovp,
884 unsigned long nr_segs,
887 xfs_fsize_t *new_size,
890 struct file *file = iocb->ki_filp;
891 struct address_space *mapping = file->f_mapping;
892 struct inode *inode = mapping->host;
893 struct xfs_inode *ip = XFS_I(inode);
896 size_t count = ocount;
898 *iolock = XFS_IOLOCK_EXCL;
899 xfs_rw_ilock(ip, *iolock);
901 ret = xfs_file_aio_write_checks(file, &pos, &count, new_size, iolock);
905 /* We can write back this queue in page reclaim */
906 current->backing_dev_info = mapping->backing_dev_info;
909 trace_xfs_file_buffered_write(ip, count, iocb->ki_pos, 0);
910 ret = generic_file_buffered_write(iocb, iovp, nr_segs,
911 pos, &iocb->ki_pos, count, ret);
913 * if we just got an ENOSPC, flush the inode now we aren't holding any
914 * page locks and retry *once*
916 if (ret == -ENOSPC && !enospc) {
917 ret = -xfs_flush_pages(ip, 0, -1, 0, FI_NONE);
923 current->backing_dev_info = NULL;
930 const struct iovec *iovp,
931 unsigned long nr_segs,
934 struct file *file = iocb->ki_filp;
935 struct address_space *mapping = file->f_mapping;
936 struct inode *inode = mapping->host;
937 struct xfs_inode *ip = XFS_I(inode);
941 xfs_fsize_t new_size = 0;
943 XFS_STATS_INC(xs_write_calls);
945 BUG_ON(iocb->ki_pos != pos);
947 ret = generic_segment_checks(iovp, &nr_segs, &ocount, VERIFY_READ);
954 xfs_wait_for_freeze(ip->i_mount, SB_FREEZE_WRITE);
956 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
959 if (unlikely(file->f_flags & O_DIRECT))
960 ret = xfs_file_dio_aio_write(iocb, iovp, nr_segs, pos,
961 ocount, &new_size, &iolock);
963 ret = xfs_file_buffered_aio_write(iocb, iovp, nr_segs, pos,
964 ocount, &new_size, &iolock);
966 xfs_aio_write_isize_update(inode, &iocb->ki_pos, ret);
971 /* Handle various SYNC-type writes */
972 if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
973 loff_t end = pos + ret - 1;
976 xfs_rw_iunlock(ip, iolock);
977 error = xfs_file_fsync(file, pos, end,
978 (file->f_flags & __O_SYNC) ? 0 : 1);
979 xfs_rw_ilock(ip, iolock);
985 xfs_aio_write_newsize_update(ip, new_size);
986 xfs_rw_iunlock(ip, iolock);
997 struct inode *inode = file->f_path.dentry->d_inode;
1001 xfs_inode_t *ip = XFS_I(inode);
1002 int cmd = XFS_IOC_RESVSP;
1003 int attr_flags = XFS_ATTR_NOLOCK;
1005 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1009 bf.l_start = offset;
1012 xfs_ilock(ip, XFS_IOLOCK_EXCL);
1014 if (mode & FALLOC_FL_PUNCH_HOLE)
1015 cmd = XFS_IOC_UNRESVSP;
1017 /* check the new inode size is valid before allocating */
1018 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1019 offset + len > i_size_read(inode)) {
1020 new_size = offset + len;
1021 error = inode_newsize_ok(inode, new_size);
1026 if (file->f_flags & O_DSYNC)
1027 attr_flags |= XFS_ATTR_SYNC;
1029 error = -xfs_change_file_space(file->f_dentry, cmd, &bf, 0,
1034 /* Change file size if needed */
1038 iattr.ia_valid = ATTR_SIZE;
1039 iattr.ia_size = new_size;
1040 error = -xfs_setattr_size(file->f_dentry, &iattr,
1045 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1052 struct inode *inode,
1055 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
1057 if (XFS_FORCED_SHUTDOWN(XFS_M(inode->i_sb)))
1064 struct inode *inode,
1067 struct xfs_inode *ip = XFS_I(inode);
1071 error = xfs_file_open(inode, file);
1076 * If there are any blocks, read-ahead block 0 as we're almost
1077 * certain to have the next operation be a read there.
1079 mode = xfs_ilock_map_shared(ip);
1080 if (ip->i_d.di_nextents > 0)
1081 xfs_da_reada_buf(NULL, ip, 0, XFS_DATA_FORK);
1082 xfs_iunlock(ip, mode);
1088 struct inode *inode,
1091 return -xfs_release(XFS_I(inode));
1100 struct inode *inode = filp->f_path.dentry->d_inode;
1101 xfs_inode_t *ip = XFS_I(inode);
1106 * The Linux API doesn't pass down the total size of the buffer
1107 * we read into down to the filesystem. With the filldir concept
1108 * it's not needed for correct information, but the XFS dir2 leaf
1109 * code wants an estimate of the buffer size to calculate it's
1110 * readahead window and size the buffers used for mapping to
1113 * Try to give it an estimate that's good enough, maybe at some
1114 * point we can change the ->readdir prototype to include the
1115 * buffer size. For now we use the current glibc buffer size.
1117 bufsize = (size_t)min_t(loff_t, 32768, ip->i_d.di_size);
1119 error = xfs_readdir(ip, dirent, bufsize,
1120 (xfs_off_t *)&filp->f_pos, filldir);
1129 struct vm_area_struct *vma)
1131 vma->vm_ops = &xfs_file_vm_ops;
1132 vma->vm_flags |= VM_CAN_NONLINEAR;
1134 file_accessed(filp);
1139 * mmap()d file has taken write protection fault and is being made
1140 * writable. We can set the page state up correctly for a writable
1141 * page, which means we can do correct delalloc accounting (ENOSPC
1142 * checking!) and unwritten extent mapping.
1145 xfs_vm_page_mkwrite(
1146 struct vm_area_struct *vma,
1147 struct vm_fault *vmf)
1149 return block_page_mkwrite(vma, vmf, xfs_get_blocks);
1152 const struct file_operations xfs_file_operations = {
1153 .llseek = generic_file_llseek,
1154 .read = do_sync_read,
1155 .write = do_sync_write,
1156 .aio_read = xfs_file_aio_read,
1157 .aio_write = xfs_file_aio_write,
1158 .splice_read = xfs_file_splice_read,
1159 .splice_write = xfs_file_splice_write,
1160 .unlocked_ioctl = xfs_file_ioctl,
1161 #ifdef CONFIG_COMPAT
1162 .compat_ioctl = xfs_file_compat_ioctl,
1164 .mmap = xfs_file_mmap,
1165 .open = xfs_file_open,
1166 .release = xfs_file_release,
1167 .fsync = xfs_file_fsync,
1168 .fallocate = xfs_file_fallocate,
1171 const struct file_operations xfs_dir_file_operations = {
1172 .open = xfs_dir_open,
1173 .read = generic_read_dir,
1174 .readdir = xfs_file_readdir,
1175 .llseek = generic_file_llseek,
1176 .unlocked_ioctl = xfs_file_ioctl,
1177 #ifdef CONFIG_COMPAT
1178 .compat_ioctl = xfs_file_compat_ioctl,
1180 .fsync = xfs_dir_fsync,
1183 static const struct vm_operations_struct xfs_file_vm_ops = {
1184 .fault = filemap_fault,
1185 .page_mkwrite = xfs_vm_page_mkwrite,