ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/fs/xfs/xfs_iomap.c b/marvell/linux/fs/xfs/xfs_iomap.c
new file mode 100644
index 0000000..7088042
--- /dev/null
+++ b/marvell/linux/fs/xfs/xfs_iomap.c
@@ -0,0 +1,1292 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * Copyright (c) 2016-2018 Christoph Hellwig.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_bmap.h"
+#include "xfs_bmap_util.h"
+#include "xfs_errortag.h"
+#include "xfs_error.h"
+#include "xfs_trans.h"
+#include "xfs_trans_space.h"
+#include "xfs_inode_item.h"
+#include "xfs_iomap.h"
+#include "xfs_trace.h"
+#include "xfs_quota.h"
+#include "xfs_dquot_item.h"
+#include "xfs_dquot.h"
+#include "xfs_reflink.h"
+
+
+#define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
+ << mp->m_writeio_log)
+
+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",
+ (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_bmbt_to_iomap(
+ struct xfs_inode *ip,
+ struct iomap *iomap,
+ struct xfs_bmbt_irec *imap,
+ bool shared)
+{
+ struct xfs_mount *mp = ip->i_mount;
+
+ if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
+ return xfs_alert_fsblock_zero(ip, imap);
+
+ if (imap->br_startblock == HOLESTARTBLOCK) {
+ iomap->addr = IOMAP_NULL_ADDR;
+ iomap->type = IOMAP_HOLE;
+ } else if (imap->br_startblock == DELAYSTARTBLOCK ||
+ isnullstartblock(imap->br_startblock)) {
+ iomap->addr = IOMAP_NULL_ADDR;
+ iomap->type = IOMAP_DELALLOC;
+ } else {
+ iomap->addr = BBTOB(xfs_fsb_to_db(ip, imap->br_startblock));
+ if (imap->br_state == XFS_EXT_UNWRITTEN)
+ iomap->type = IOMAP_UNWRITTEN;
+ else
+ iomap->type = IOMAP_MAPPED;
+ }
+ iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
+ iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
+ iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
+ iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));
+
+ if (xfs_ipincount(ip) &&
+ (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP))
+ iomap->flags |= IOMAP_F_DIRTY;
+ if (shared)
+ iomap->flags |= IOMAP_F_SHARED;
+ return 0;
+}
+
+static void
+xfs_hole_to_iomap(
+ struct xfs_inode *ip,
+ struct iomap *iomap,
+ xfs_fileoff_t offset_fsb,
+ xfs_fileoff_t end_fsb)
+{
+ iomap->addr = IOMAP_NULL_ADDR;
+ iomap->type = IOMAP_HOLE;
+ iomap->offset = XFS_FSB_TO_B(ip->i_mount, offset_fsb);
+ iomap->length = XFS_FSB_TO_B(ip->i_mount, end_fsb - offset_fsb);
+ iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
+ iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));
+}
+
+xfs_extlen_t
+xfs_eof_alignment(
+ struct xfs_inode *ip,
+ xfs_extlen_t extsize)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_extlen_t align = 0;
+
+ if (!XFS_IS_REALTIME_INODE(ip)) {
+ /*
+ * Round up 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.
+ *
+ * If mounted with the "-o swalloc" option the alignment is
+ * increased from the strip unit size to the stripe width.
+ */
+ if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
+ align = mp->m_swidth;
+ else if (mp->m_dalign)
+ align = mp->m_dalign;
+
+ if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align))
+ align = 0;
+ }
+
+ /*
+ * 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 (align)
+ align = roundup_64(align, extsize);
+ else
+ align = extsize;
+ }
+
+ return align;
+}
+
+STATIC int
+xfs_iomap_eof_align_last_fsb(
+ struct xfs_inode *ip,
+ xfs_extlen_t extsize,
+ xfs_fileoff_t *last_fsb)
+{
+ xfs_extlen_t align = xfs_eof_alignment(ip, extsize);
+
+ if (align) {
+ xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align);
+ int eof, error;
+
+ 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;
+}
+
+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_extlen_t extsz;
+ int nimaps;
+ int quota_flag;
+ int rt;
+ xfs_trans_t *tp;
+ uint qblocks, resblks, resrtextents;
+ int error;
+ int lockmode;
+ int bmapi_flags = XFS_BMAPI_PREALLOC;
+ uint tflags = 0;
+
+ rt = XFS_IS_REALTIME_INODE(ip);
+ extsz = xfs_get_extsz_hint(ip);
+ lockmode = XFS_ILOCK_SHARED; /* locked by caller */
+
+ ASSERT(xfs_isilocked(ip, lockmode));
+
+ offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
+ if ((offset + count) > XFS_ISIZE(ip)) {
+ /*
+ * Assert that the in-core extent list is present since this can
+ * call xfs_iread_extents() and we only have the ilock shared.
+ * This should be safe because the lock was held around a bmapi
+ * call in the caller and we only need it to access the in-core
+ * list.
+ */
+ ASSERT(XFS_IFORK_PTR(ip, XFS_DATA_FORK)->if_flags &
+ XFS_IFEXTENTS);
+ error = xfs_iomap_eof_align_last_fsb(ip, extsz, &last_fsb);
+ if (error)
+ goto out_unlock;
+ } 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 = xfs_aligned_fsb_count(offset_fsb, count_fsb, extsz);
+
+ 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;
+ }
+
+ /*
+ * Drop the shared lock acquired by the caller, attach the dquot if
+ * necessary and move on to transaction setup.
+ */
+ xfs_iunlock(ip, lockmode);
+ error = xfs_qm_dqattach(ip);
+ if (error)
+ return error;
+
+ /*
+ * For DAX, we do not allocate unwritten extents, but instead we zero
+ * the block before we commit the transaction. Ideally we'd like to do
+ * this outside the transaction context, but if we commit and then crash
+ * we may not have zeroed the blocks and this will be exposed on
+ * recovery of the allocation. Hence we must zero before commit.
+ *
+ * Further, if we are mapping unwritten extents here, we need to zero
+ * and convert them to written so that we don't need an unwritten extent
+ * callback for DAX. This also means that we need to be able to dip into
+ * the reserve block pool for bmbt block allocation if there is no space
+ * left but we need to do unwritten extent conversion.
+ */
+ if (IS_DAX(VFS_I(ip))) {
+ bmapi_flags = XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO;
+ if (imap->br_state == XFS_EXT_UNWRITTEN) {
+ tflags |= XFS_TRANS_RESERVE;
+ resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
+ }
+ }
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, resrtextents,
+ tflags, &tp);
+ if (error)
+ return error;
+
+ lockmode = XFS_ILOCK_EXCL;
+ xfs_ilock(ip, lockmode);
+
+ error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
+ if (error)
+ goto out_trans_cancel;
+
+ xfs_trans_ijoin(tp, ip, 0);
+
+ /*
+ * From this point onwards we overwrite the imap pointer that the
+ * caller gave to us.
+ */
+ nimaps = 1;
+ error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
+ bmapi_flags, resblks, imap, &nimaps);
+ if (error)
+ goto out_res_cancel;
+
+ /*
+ * Complete the transaction
+ */
+ error = xfs_trans_commit(tp);
+ if (error)
+ goto out_unlock;
+
+ /*
+ * Copy any maps to caller's array and return any error.
+ */
+ if (nimaps == 0) {
+ error = -ENOSPC;
+ goto out_unlock;
+ }
+
+ if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
+ error = xfs_alert_fsblock_zero(ip, imap);
+
+out_unlock:
+ xfs_iunlock(ip, lockmode);
+ return error;
+
+out_res_cancel:
+ xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
+out_trans_cancel:
+ xfs_trans_cancel(tp);
+ goto out_unlock;
+}
+
+STATIC bool
+xfs_quota_need_throttle(
+ struct xfs_inode *ip,
+ int type,
+ xfs_fsblock_t alloc_blocks)
+{
+ struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
+
+ if (!dq || !xfs_this_quota_on(ip->i_mount, type))
+ return false;
+
+ /* no hi watermark, no throttle */
+ if (!dq->q_prealloc_hi_wmark)
+ return false;
+
+ /* under the lo watermark, no throttle */
+ if (dq->q_res_bcount + alloc_blocks < dq->q_prealloc_lo_wmark)
+ return false;
+
+ return true;
+}
+
+STATIC void
+xfs_quota_calc_throttle(
+ struct xfs_inode *ip,
+ int type,
+ xfs_fsblock_t *qblocks,
+ int *qshift,
+ int64_t *qfreesp)
+{
+ int64_t freesp;
+ int shift = 0;
+ struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
+
+ /* no dq, or over hi wmark, squash the prealloc completely */
+ if (!dq || dq->q_res_bcount >= dq->q_prealloc_hi_wmark) {
+ *qblocks = 0;
+ *qfreesp = 0;
+ return;
+ }
+
+ freesp = dq->q_prealloc_hi_wmark - dq->q_res_bcount;
+ if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) {
+ shift = 2;
+ if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT])
+ shift += 2;
+ if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT])
+ shift += 2;
+ }
+
+ if (freesp < *qfreesp)
+ *qfreesp = freesp;
+
+ /* only overwrite the throttle values if we are more aggressive */
+ if ((freesp >> shift) < (*qblocks >> *qshift)) {
+ *qblocks = freesp;
+ *qshift = shift;
+ }
+}
+
+/*
+ * If we are doing a write at the end of the file and there are no allocations
+ * past this one, then extend the allocation out to the file system's write
+ * iosize.
+ *
+ * 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.
+ *
+ * As an exception we don't do any preallocation at all if the file is smaller
+ * than the minimum preallocation and we are using the default dynamic
+ * preallocation scheme, as it is likely this is the only write to the file that
+ * is going to be done.
+ *
+ * We clean up any extra space left over when the file is closed in
+ * xfs_inactive().
+ */
+STATIC xfs_fsblock_t
+xfs_iomap_prealloc_size(
+ struct xfs_inode *ip,
+ int whichfork,
+ loff_t offset,
+ loff_t count,
+ struct xfs_iext_cursor *icur)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ struct xfs_bmbt_irec prev;
+ int shift = 0;
+ int64_t freesp;
+ xfs_fsblock_t qblocks;
+ int qshift = 0;
+ xfs_fsblock_t alloc_blocks = 0;
+
+ if (offset + count <= XFS_ISIZE(ip))
+ return 0;
+
+ if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) &&
+ (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks)))
+ return 0;
+
+ /*
+ * If an explicit allocsize is set, the file is small, or we
+ * are writing behind a hole, then use the minimum prealloc:
+ */
+ if ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ||
+ XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign) ||
+ !xfs_iext_peek_prev_extent(ifp, icur, &prev) ||
+ prev.br_startoff + prev.br_blockcount < offset_fsb)
+ return mp->m_writeio_blocks;
+
+ /*
+ * Determine the initial size of the preallocation. We are beyond the
+ * current EOF here, but we need to take into account whether this is
+ * a sparse write or an extending write when determining the
+ * preallocation size. Hence we need to look up the extent that ends
+ * at the current write offset and use the result to determine the
+ * preallocation size.
+ *
+ * If the extent is a hole, then preallocation is essentially disabled.
+ * Otherwise we take the size of the preceding data extent as the basis
+ * for the preallocation size. If the size of the extent is greater than
+ * half the maximum extent length, then use the current offset as the
+ * basis. This ensures that for large files the preallocation size
+ * always extends to MAXEXTLEN rather than falling short due to things
+ * like stripe unit/width alignment of real extents.
+ */
+ if (prev.br_blockcount <= (MAXEXTLEN >> 1))
+ alloc_blocks = prev.br_blockcount << 1;
+ else
+ alloc_blocks = XFS_B_TO_FSB(mp, offset);
+ if (!alloc_blocks)
+ goto check_writeio;
+ qblocks = alloc_blocks;
+
+ /*
+ * MAXEXTLEN is not a power of two value but we round the prealloc down
+ * to the nearest power of two value after throttling. To prevent the
+ * round down from unconditionally reducing the maximum supported prealloc
+ * size, we round up first, apply appropriate throttling, round down and
+ * cap the value to MAXEXTLEN.
+ */
+ alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN),
+ alloc_blocks);
+
+ freesp = percpu_counter_read_positive(&mp->m_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++;
+ }
+
+ /*
+ * Check each quota to cap the prealloc size, provide a shift value to
+ * throttle with and adjust amount of available space.
+ */
+ if (xfs_quota_need_throttle(ip, XFS_DQ_USER, alloc_blocks))
+ xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift,
+ &freesp);
+ if (xfs_quota_need_throttle(ip, XFS_DQ_GROUP, alloc_blocks))
+ xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift,
+ &freesp);
+ if (xfs_quota_need_throttle(ip, XFS_DQ_PROJ, alloc_blocks))
+ xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift,
+ &freesp);
+
+ /*
+ * The final prealloc size is set to the minimum of free space available
+ * in each of the quotas and the overall filesystem.
+ *
+ * The shift throttle value is set to the maximum value as determined by
+ * the global low free space values and per-quota low free space values.
+ */
+ alloc_blocks = min(alloc_blocks, qblocks);
+ shift = max(shift, qshift);
+
+ if (shift)
+ alloc_blocks >>= shift;
+ /*
+ * rounddown_pow_of_two() returns an undefined result if we pass in
+ * alloc_blocks = 0.
+ */
+ if (alloc_blocks)
+ alloc_blocks = rounddown_pow_of_two(alloc_blocks);
+ if (alloc_blocks > MAXEXTLEN)
+ alloc_blocks = MAXEXTLEN;
+
+ /*
+ * If we are still trying to allocate more space than is
+ * available, squash the prealloc hard. This can happen if we
+ * have a large file on a small filesystem and the above
+ * lowspace thresholds are smaller than MAXEXTLEN.
+ */
+ while (alloc_blocks && alloc_blocks >= freesp)
+ alloc_blocks >>= 4;
+check_writeio:
+ if (alloc_blocks < mp->m_writeio_blocks)
+ alloc_blocks = mp->m_writeio_blocks;
+ trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
+ mp->m_writeio_blocks);
+ return alloc_blocks;
+}
+
+static int
+xfs_file_iomap_begin_delay(
+ struct inode *inode,
+ loff_t offset,
+ loff_t count,
+ unsigned flags,
+ struct iomap *iomap)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ xfs_fileoff_t maxbytes_fsb =
+ XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
+ xfs_fileoff_t end_fsb;
+ struct xfs_bmbt_irec imap, cmap;
+ struct xfs_iext_cursor icur, ccur;
+ xfs_fsblock_t prealloc_blocks = 0;
+ bool eof = false, cow_eof = false, shared = false;
+ int whichfork = XFS_DATA_FORK;
+ int error = 0;
+
+ ASSERT(!XFS_IS_REALTIME_INODE(ip));
+ ASSERT(!xfs_get_extsz_hint(ip));
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+ if (unlikely(XFS_TEST_ERROR(
+ (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
+ mp, XFS_ERRTAG_BMAPIFORMAT))) {
+ XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
+ error = -EFSCORRUPTED;
+ goto out_unlock;
+ }
+
+ XFS_STATS_INC(mp, xs_blk_mapw);
+
+ if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
+ if (error)
+ goto out_unlock;
+ }
+
+ end_fsb = min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb);
+
+ /*
+ * Search the data fork fork first to look up our source mapping. We
+ * always need the data fork map, as we have to return it to the
+ * iomap code so that the higher level write code can read data in to
+ * perform read-modify-write cycles for unaligned writes.
+ */
+ eof = !xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap);
+ if (eof)
+ imap.br_startoff = end_fsb; /* fake hole until the end */
+
+ /* We never need to allocate blocks for zeroing a hole. */
+ if ((flags & IOMAP_ZERO) && imap.br_startoff > offset_fsb) {
+ xfs_hole_to_iomap(ip, iomap, offset_fsb, imap.br_startoff);
+ goto out_unlock;
+ }
+
+ /*
+ * Search the COW fork extent list even if we did not find a data fork
+ * extent. This serves two purposes: first this implements the
+ * speculative preallocation using cowextsize, so that we also unshare
+ * block adjacent to shared blocks instead of just the shared blocks
+ * themselves. Second the lookup in the extent list is generally faster
+ * than going out to the shared extent tree.
+ */
+ if (xfs_is_cow_inode(ip)) {
+ if (!ip->i_cowfp) {
+ ASSERT(!xfs_is_reflink_inode(ip));
+ xfs_ifork_init_cow(ip);
+ }
+ cow_eof = !xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb,
+ &ccur, &cmap);
+ if (!cow_eof && cmap.br_startoff <= offset_fsb) {
+ trace_xfs_reflink_cow_found(ip, &cmap);
+ whichfork = XFS_COW_FORK;
+ goto done;
+ }
+ }
+
+ if (imap.br_startoff <= offset_fsb) {
+ /*
+ * For reflink files we may need a delalloc reservation when
+ * overwriting shared extents. This includes zeroing of
+ * existing extents that contain data.
+ */
+ if (!xfs_is_cow_inode(ip) ||
+ ((flags & IOMAP_ZERO) && imap.br_state != XFS_EXT_NORM)) {
+ trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
+ &imap);
+ goto done;
+ }
+
+ xfs_trim_extent(&imap, offset_fsb, end_fsb - offset_fsb);
+
+ /* Trim the mapping to the nearest shared extent boundary. */
+ error = xfs_inode_need_cow(ip, &imap, &shared);
+ if (error)
+ goto out_unlock;
+
+ /* Not shared? Just report the (potentially capped) extent. */
+ if (!shared) {
+ trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
+ &imap);
+ goto done;
+ }
+
+ /*
+ * Fork all the shared blocks from our write offset until the
+ * end of the extent.
+ */
+ whichfork = XFS_COW_FORK;
+ end_fsb = imap.br_startoff + imap.br_blockcount;
+ } else {
+ /*
+ * We cap the maximum length we map here to MAX_WRITEBACK_PAGES
+ * pages to keep the chunks of work done where somewhat
+ * symmetric with the work writeback does. This is a completely
+ * arbitrary number pulled out of thin air.
+ *
+ * Note that the values needs to be less than 32-bits wide until
+ * the lower level functions are updated.
+ */
+ count = min_t(loff_t, count, 1024 * PAGE_SIZE);
+ end_fsb = min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb);
+
+ if (xfs_is_always_cow_inode(ip))
+ whichfork = XFS_COW_FORK;
+ }
+
+ error = xfs_qm_dqattach_locked(ip, false);
+ if (error)
+ goto out_unlock;
+
+ if (eof) {
+ prealloc_blocks = xfs_iomap_prealloc_size(ip, whichfork, offset,
+ count, &icur);
+ if (prealloc_blocks) {
+ xfs_extlen_t align;
+ xfs_off_t end_offset;
+ xfs_fileoff_t p_end_fsb;
+
+ end_offset = XFS_WRITEIO_ALIGN(mp, offset + count - 1);
+ p_end_fsb = XFS_B_TO_FSBT(mp, end_offset) +
+ prealloc_blocks;
+
+ align = xfs_eof_alignment(ip, 0);
+ if (align)
+ p_end_fsb = roundup_64(p_end_fsb, align);
+
+ p_end_fsb = min(p_end_fsb, maxbytes_fsb);
+ ASSERT(p_end_fsb > offset_fsb);
+ prealloc_blocks = p_end_fsb - end_fsb;
+ }
+ }
+
+retry:
+ error = xfs_bmapi_reserve_delalloc(ip, whichfork, offset_fsb,
+ end_fsb - offset_fsb, prealloc_blocks,
+ whichfork == XFS_DATA_FORK ? &imap : &cmap,
+ whichfork == XFS_DATA_FORK ? &icur : &ccur,
+ whichfork == XFS_DATA_FORK ? eof : cow_eof);
+ switch (error) {
+ case 0:
+ break;
+ case -ENOSPC:
+ case -EDQUOT:
+ /* retry without any preallocation */
+ trace_xfs_delalloc_enospc(ip, offset, count);
+ if (prealloc_blocks) {
+ prealloc_blocks = 0;
+ goto retry;
+ }
+ /*FALLTHRU*/
+ default:
+ goto out_unlock;
+ }
+
+ /*
+ * Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch
+ * them out if the write happens to fail.
+ */
+ iomap->flags |= IOMAP_F_NEW;
+ trace_xfs_iomap_alloc(ip, offset, count, whichfork,
+ whichfork == XFS_DATA_FORK ? &imap : &cmap);
+done:
+ if (whichfork == XFS_COW_FORK) {
+ if (imap.br_startoff > offset_fsb) {
+ xfs_trim_extent(&cmap, offset_fsb,
+ imap.br_startoff - offset_fsb);
+ error = xfs_bmbt_to_iomap(ip, iomap, &cmap, true);
+ goto out_unlock;
+ }
+ /* ensure we only report blocks we have a reservation for */
+ xfs_trim_extent(&imap, cmap.br_startoff, cmap.br_blockcount);
+ shared = true;
+ }
+ error = xfs_bmbt_to_iomap(ip, iomap, &imap, shared);
+out_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+}
+
+int
+xfs_iomap_write_unwritten(
+ xfs_inode_t *ip,
+ xfs_off_t offset,
+ xfs_off_t count,
+ bool update_isize)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_fileoff_t offset_fsb;
+ xfs_filblks_t count_fsb;
+ xfs_filblks_t numblks_fsb;
+ int nimaps;
+ xfs_trans_t *tp;
+ xfs_bmbt_irec_t imap;
+ struct inode *inode = VFS_I(ip);
+ xfs_fsize_t i_size;
+ uint resblks;
+ 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;
+
+ /* Attach dquots so that bmbt splits are accounted correctly. */
+ error = xfs_qm_dqattach(ip);
+ if (error)
+ return error;
+
+ 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 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.
+ */
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0,
+ XFS_TRANS_RESERVE, &tp);
+ if (error)
+ return error;
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, ip, 0);
+
+ error = xfs_trans_reserve_quota_nblks(tp, ip, resblks, 0,
+ XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES);
+ if (error)
+ goto error_on_bmapi_transaction;
+
+ /*
+ * Modify the unwritten extent state of the buffer.
+ */
+ nimaps = 1;
+ error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
+ XFS_BMAPI_CONVERT, resblks, &imap,
+ &nimaps);
+ if (error)
+ goto error_on_bmapi_transaction;
+
+ /*
+ * Log the updated inode size as we go. We have to be careful
+ * to only log it up to the actual write offset if it is
+ * halfway into a block.
+ */
+ i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb);
+ if (i_size > offset + count)
+ i_size = offset + count;
+ if (update_isize && i_size > i_size_read(inode))
+ i_size_write(inode, i_size);
+ i_size = xfs_new_eof(ip, i_size);
+ if (i_size) {
+ ip->i_d.di_size = i_size;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ }
+
+ error = xfs_trans_commit(tp);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ if (error)
+ return error;
+
+ if (unlikely(!xfs_valid_startblock(ip, imap.br_startblock)))
+ 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_trans_cancel(tp);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+}
+
+static inline bool
+imap_needs_alloc(
+ struct inode *inode,
+ struct xfs_bmbt_irec *imap,
+ int nimaps)
+{
+ return !nimaps ||
+ imap->br_startblock == HOLESTARTBLOCK ||
+ imap->br_startblock == DELAYSTARTBLOCK ||
+ (IS_DAX(inode) && imap->br_state == XFS_EXT_UNWRITTEN);
+}
+
+static inline bool
+needs_cow_for_zeroing(
+ struct xfs_bmbt_irec *imap,
+ int nimaps)
+{
+ return nimaps &&
+ imap->br_startblock != HOLESTARTBLOCK &&
+ imap->br_state != XFS_EXT_UNWRITTEN;
+}
+
+static int
+xfs_ilock_for_iomap(
+ struct xfs_inode *ip,
+ unsigned flags,
+ unsigned *lockmode)
+{
+ unsigned mode = XFS_ILOCK_SHARED;
+ bool is_write = flags & (IOMAP_WRITE | IOMAP_ZERO);
+
+ /*
+ * COW writes may allocate delalloc space or convert unwritten COW
+ * extents, so we need to make sure to take the lock exclusively here.
+ */
+ if (xfs_is_cow_inode(ip) && is_write) {
+ /*
+ * FIXME: It could still overwrite on unshared extents and not
+ * need allocation.
+ */
+ if (flags & IOMAP_NOWAIT)
+ return -EAGAIN;
+ mode = XFS_ILOCK_EXCL;
+ }
+
+ /*
+ * Extents not yet cached requires exclusive access, don't block. This
+ * is an opencoded xfs_ilock_data_map_shared() call but with
+ * non-blocking behaviour.
+ */
+ if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) {
+ if (flags & IOMAP_NOWAIT)
+ return -EAGAIN;
+ mode = XFS_ILOCK_EXCL;
+ }
+
+relock:
+ if (flags & IOMAP_NOWAIT) {
+ if (!xfs_ilock_nowait(ip, mode))
+ return -EAGAIN;
+ } else {
+ xfs_ilock(ip, mode);
+ }
+
+ /*
+ * The reflink iflag could have changed since the earlier unlocked
+ * check, so if we got ILOCK_SHARED for a write and but we're now a
+ * reflink inode we have to switch to ILOCK_EXCL and relock.
+ */
+ if (mode == XFS_ILOCK_SHARED && is_write && xfs_is_cow_inode(ip)) {
+ xfs_iunlock(ip, mode);
+ mode = XFS_ILOCK_EXCL;
+ goto relock;
+ }
+
+ *lockmode = mode;
+ return 0;
+}
+
+static int
+xfs_file_iomap_begin(
+ struct inode *inode,
+ loff_t offset,
+ loff_t length,
+ unsigned flags,
+ struct iomap *iomap)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_bmbt_irec imap;
+ xfs_fileoff_t offset_fsb, end_fsb;
+ int nimaps = 1, error = 0;
+ bool shared = false;
+ unsigned lockmode;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ if ((flags & (IOMAP_WRITE | IOMAP_ZERO)) && !(flags & IOMAP_DIRECT) &&
+ !IS_DAX(inode) && !xfs_get_extsz_hint(ip)) {
+ /* Reserve delalloc blocks for regular writeback. */
+ return xfs_file_iomap_begin_delay(inode, offset, length, flags,
+ iomap);
+ }
+
+ /*
+ * Lock the inode in the manner required for the specified operation and
+ * check for as many conditions that would result in blocking as
+ * possible. This removes most of the non-blocking checks from the
+ * mapping code below.
+ */
+ error = xfs_ilock_for_iomap(ip, flags, &lockmode);
+ if (error)
+ return error;
+
+ ASSERT(offset <= mp->m_super->s_maxbytes);
+ if (offset > mp->m_super->s_maxbytes - length)
+ length = mp->m_super->s_maxbytes - offset;
+ offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ end_fsb = XFS_B_TO_FSB(mp, offset + length);
+
+ error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
+ &nimaps, 0);
+ if (error)
+ goto out_unlock;
+
+ if (flags & IOMAP_REPORT) {
+ /* Trim the mapping to the nearest shared extent boundary. */
+ error = xfs_reflink_trim_around_shared(ip, &imap, &shared);
+ if (error)
+ goto out_unlock;
+ }
+
+ /* Non-modifying mapping requested, so we are done */
+ if (!(flags & (IOMAP_WRITE | IOMAP_ZERO)))
+ goto out_found;
+
+ /*
+ * Break shared extents if necessary. Checks for non-blocking IO have
+ * been done up front, so we don't need to do them here.
+ */
+ if (xfs_is_cow_inode(ip)) {
+ struct xfs_bmbt_irec cmap;
+ bool directio = (flags & IOMAP_DIRECT);
+
+ /* if zeroing doesn't need COW allocation, then we are done. */
+ if ((flags & IOMAP_ZERO) &&
+ !needs_cow_for_zeroing(&imap, nimaps))
+ goto out_found;
+
+ /* may drop and re-acquire the ilock */
+ cmap = imap;
+ error = xfs_reflink_allocate_cow(ip, &cmap, &shared, &lockmode,
+ directio);
+ if (error)
+ goto out_unlock;
+
+ /*
+ * For buffered writes we need to report the address of the
+ * previous block (if there was any) so that the higher level
+ * write code can perform read-modify-write operations; we
+ * won't need the CoW fork mapping until writeback. For direct
+ * I/O, which must be block aligned, we need to report the
+ * newly allocated address. If the data fork has a hole, copy
+ * the COW fork mapping to avoid allocating to the data fork.
+ *
+ * Otherwise, ensure that the imap range does not extend past
+ * the range allocated/found in cmap.
+ */
+ if (directio || imap.br_startblock == HOLESTARTBLOCK)
+ imap = cmap;
+ else
+ xfs_trim_extent(&imap, cmap.br_startoff,
+ cmap.br_blockcount);
+
+ end_fsb = imap.br_startoff + imap.br_blockcount;
+ length = XFS_FSB_TO_B(mp, end_fsb) - offset;
+ }
+
+ /* Don't need to allocate over holes when doing zeroing operations. */
+ if (flags & IOMAP_ZERO)
+ goto out_found;
+
+ if (!imap_needs_alloc(inode, &imap, nimaps))
+ goto out_found;
+
+ /* If nowait is set bail since we are going to make allocations. */
+ if (flags & IOMAP_NOWAIT) {
+ error = -EAGAIN;
+ goto out_unlock;
+ }
+
+ /*
+ * We cap the maximum length we map to a sane size to keep the chunks
+ * of work done where somewhat symmetric with the work writeback does.
+ * This is a completely arbitrary number pulled out of thin air as a
+ * best guess for initial testing.
+ *
+ * Note that the values needs to be less than 32-bits wide until the
+ * lower level functions are updated.
+ */
+ length = min_t(loff_t, length, 1024 * PAGE_SIZE);
+
+ /*
+ * xfs_iomap_write_direct() expects the shared lock. It is unlocked on
+ * return.
+ */
+ if (lockmode == XFS_ILOCK_EXCL)
+ xfs_ilock_demote(ip, lockmode);
+ error = xfs_iomap_write_direct(ip, offset, length, &imap,
+ nimaps);
+ if (error)
+ return error;
+
+ iomap->flags |= IOMAP_F_NEW;
+ trace_xfs_iomap_alloc(ip, offset, length, XFS_DATA_FORK, &imap);
+
+out_finish:
+ /*
+ * Writes that span EOF might trigger an IO size update on completion,
+ * so consider them to be dirty for the purposes of O_DSYNC even if
+ * there is no other metadata changes pending or have been made here.
+ */
+ if ((flags & IOMAP_WRITE) && offset + length > i_size_read(inode))
+ iomap->flags |= IOMAP_F_DIRTY;
+ return xfs_bmbt_to_iomap(ip, iomap, &imap, shared);
+
+out_found:
+ ASSERT(nimaps);
+ xfs_iunlock(ip, lockmode);
+ trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
+ goto out_finish;
+
+out_unlock:
+ xfs_iunlock(ip, lockmode);
+ return error;
+}
+
+static int
+xfs_file_iomap_end_delalloc(
+ struct xfs_inode *ip,
+ loff_t offset,
+ loff_t length,
+ ssize_t written,
+ struct iomap *iomap)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t start_fsb;
+ xfs_fileoff_t end_fsb;
+ int error = 0;
+
+ /*
+ * Behave as if the write failed if drop writes is enabled. Set the NEW
+ * flag to force delalloc cleanup.
+ */
+ if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DROP_WRITES)) {
+ iomap->flags |= IOMAP_F_NEW;
+ written = 0;
+ }
+
+ /*
+ * start_fsb refers to the first unused block after a short write. If
+ * nothing was written, round offset down to point at the first block in
+ * the range.
+ */
+ if (unlikely(!written))
+ start_fsb = XFS_B_TO_FSBT(mp, offset);
+ else
+ start_fsb = XFS_B_TO_FSB(mp, offset + written);
+ end_fsb = XFS_B_TO_FSB(mp, offset + length);
+
+ /*
+ * Trim delalloc blocks if they were allocated by this write and we
+ * didn't manage to write the whole range.
+ *
+ * We don't need to care about racing delalloc as we hold i_mutex
+ * across the reserve/allocate/unreserve calls. If there are delalloc
+ * blocks in the range, they are ours.
+ */
+ if ((iomap->flags & IOMAP_F_NEW) && start_fsb < end_fsb) {
+ truncate_pagecache_range(VFS_I(ip), XFS_FSB_TO_B(mp, start_fsb),
+ XFS_FSB_TO_B(mp, end_fsb) - 1);
+
+ error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
+ end_fsb - start_fsb);
+ if (error && !XFS_FORCED_SHUTDOWN(mp)) {
+ xfs_alert(mp, "%s: unable to clean up ino %lld",
+ __func__, ip->i_ino);
+ return error;
+ }
+ }
+
+ return 0;
+}
+
+static int
+xfs_file_iomap_end(
+ struct inode *inode,
+ loff_t offset,
+ loff_t length,
+ ssize_t written,
+ unsigned flags,
+ struct iomap *iomap)
+{
+ if ((flags & IOMAP_WRITE) && iomap->type == IOMAP_DELALLOC)
+ return xfs_file_iomap_end_delalloc(XFS_I(inode), offset,
+ length, written, iomap);
+ return 0;
+}
+
+const struct iomap_ops xfs_iomap_ops = {
+ .iomap_begin = xfs_file_iomap_begin,
+ .iomap_end = xfs_file_iomap_end,
+};
+
+static int
+xfs_seek_iomap_begin(
+ struct inode *inode,
+ loff_t offset,
+ loff_t length,
+ unsigned flags,
+ struct iomap *iomap)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length);
+ xfs_fileoff_t cow_fsb = NULLFILEOFF, data_fsb = NULLFILEOFF;
+ struct xfs_iext_cursor icur;
+ struct xfs_bmbt_irec imap, cmap;
+ int error = 0;
+ unsigned lockmode;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ lockmode = xfs_ilock_data_map_shared(ip);
+ if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
+ if (error)
+ goto out_unlock;
+ }
+
+ if (xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap)) {
+ /*
+ * If we found a data extent we are done.
+ */
+ if (imap.br_startoff <= offset_fsb)
+ goto done;
+ data_fsb = imap.br_startoff;
+ } else {
+ /*
+ * Fake a hole until the end of the file.
+ */
+ data_fsb = min(XFS_B_TO_FSB(mp, offset + length),
+ XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
+ }
+
+ /*
+ * If a COW fork extent covers the hole, report it - capped to the next
+ * data fork extent:
+ */
+ if (xfs_inode_has_cow_data(ip) &&
+ xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &cmap))
+ cow_fsb = cmap.br_startoff;
+ if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
+ if (data_fsb < cow_fsb + cmap.br_blockcount)
+ end_fsb = min(end_fsb, data_fsb);
+ xfs_trim_extent(&cmap, offset_fsb, end_fsb);
+ error = xfs_bmbt_to_iomap(ip, iomap, &cmap, true);
+ /*
+ * This is a COW extent, so we must probe the page cache
+ * because there could be dirty page cache being backed
+ * by this extent.
+ */
+ iomap->type = IOMAP_UNWRITTEN;
+ goto out_unlock;
+ }
+
+ /*
+ * Else report a hole, capped to the next found data or COW extent.
+ */
+ if (cow_fsb != NULLFILEOFF && cow_fsb < data_fsb)
+ imap.br_blockcount = cow_fsb - offset_fsb;
+ else
+ imap.br_blockcount = data_fsb - offset_fsb;
+ imap.br_startoff = offset_fsb;
+ imap.br_startblock = HOLESTARTBLOCK;
+ imap.br_state = XFS_EXT_NORM;
+done:
+ xfs_trim_extent(&imap, offset_fsb, end_fsb);
+ error = xfs_bmbt_to_iomap(ip, iomap, &imap, false);
+out_unlock:
+ xfs_iunlock(ip, lockmode);
+ return error;
+}
+
+const struct iomap_ops xfs_seek_iomap_ops = {
+ .iomap_begin = xfs_seek_iomap_begin,
+};
+
+static int
+xfs_xattr_iomap_begin(
+ struct inode *inode,
+ loff_t offset,
+ loff_t length,
+ unsigned flags,
+ struct iomap *iomap)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length);
+ struct xfs_bmbt_irec imap;
+ int nimaps = 1, error = 0;
+ unsigned lockmode;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ lockmode = xfs_ilock_attr_map_shared(ip);
+
+ /* if there are no attribute fork or extents, return ENOENT */
+ if (!XFS_IFORK_Q(ip) || !ip->i_d.di_anextents) {
+ error = -ENOENT;
+ goto out_unlock;
+ }
+
+ ASSERT(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL);
+ error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
+ &nimaps, XFS_BMAPI_ATTRFORK);
+out_unlock:
+ xfs_iunlock(ip, lockmode);
+
+ if (error)
+ return error;
+ ASSERT(nimaps);
+ return xfs_bmbt_to_iomap(ip, iomap, &imap, false);
+}
+
+const struct iomap_ops xfs_xattr_iomap_ops = {
+ .iomap_begin = xfs_xattr_iomap_begin,
+};