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-rw-r--r--fs/xfs/xfs_bmap.c59
-rw-r--r--fs/xfs/xfs_bmap.h18
-rw-r--r--fs/xfs/xfs_bmap_btree.h8
-rw-r--r--fs/xfs/xfs_inode.c715
-rw-r--r--fs/xfs/xfs_inode.h52
5 files changed, 826 insertions, 26 deletions
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 53c47a181f87..81a95b684b6b 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -3423,6 +3423,7 @@ xfs_bmap_local_to_extents(
3423 xfs_bmap_forkoff_reset(args.mp, ip, whichfork); 3423 xfs_bmap_forkoff_reset(args.mp, ip, whichfork);
3424 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork); 3424 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3425 xfs_iext_add(ifp, 0, 1); 3425 xfs_iext_add(ifp, 0, 1);
3426 ASSERT((ifp->if_flags & (XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFEXTENTS);
3426 ep = xfs_iext_get_ext(ifp, 0); 3427 ep = xfs_iext_get_ext(ifp, 0);
3427 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM); 3428 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3428 xfs_bmap_trace_post_update(fname, "new", ip, 0, whichfork); 3429 xfs_bmap_trace_post_update(fname, "new", ip, 0, whichfork);
@@ -3552,6 +3553,54 @@ xfs_bmap_do_search_extents(
3552} 3553}
3553 3554
3554/* 3555/*
3556 * Call xfs_bmap_do_search_extents() to search for the extent
3557 * record containing block bno. If in multi-level in-core extent
3558 * allocation mode, find and extract the target extent buffer,
3559 * otherwise just use the direct extent list.
3560 */
3561xfs_bmbt_rec_t * /* pointer to found extent entry */
3562xfs_bmap_search_multi_extents(
3563 xfs_ifork_t *ifp, /* inode fork pointer */
3564 xfs_fileoff_t bno, /* block number searched for */
3565 int *eofp, /* out: end of file found */
3566 xfs_extnum_t *lastxp, /* out: last extent index */
3567 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3568 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3569{
3570 xfs_bmbt_rec_t *base; /* base of extent records */
3571 xfs_bmbt_rec_t *ep; /* extent record pointer */
3572 xfs_ext_irec_t *erp = NULL; /* indirection array pointer */
3573 xfs_extnum_t lastx; /* last extent index */
3574 xfs_extnum_t nextents; /* number of file extents */
3575
3576 /*
3577 * For multi-level extent allocation mode, find the
3578 * target extent list and pass only the contiguous
3579 * list to xfs_bmap_do_search_extents. Convert lastx
3580 * from a file extent index to an index within the
3581 * target extent list.
3582 */
3583 if (ifp->if_flags & XFS_IFEXTIREC) {
3584 int erp_idx = 0;
3585 erp = xfs_iext_bno_to_irec(ifp, bno, &erp_idx);
3586 base = erp->er_extbuf;
3587 nextents = erp->er_extcount;
3588 lastx = ifp->if_lastex - erp->er_extoff;
3589 } else {
3590 base = &ifp->if_u1.if_extents[0];
3591 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3592 lastx = ifp->if_lastex;
3593 }
3594 ep = xfs_bmap_do_search_extents(base, lastx, nextents, bno,
3595 eofp, lastxp, gotp, prevp);
3596 /* Convert lastx back to file-based index */
3597 if (ifp->if_flags & XFS_IFEXTIREC) {
3598 *lastxp += erp->er_extoff;
3599 }
3600 return ep;
3601}
3602
3603/*
3555 * Search the extents list for the inode, for the extent containing bno. 3604 * Search the extents list for the inode, for the extent containing bno.
3556 * If bno lies in a hole, point to the next entry. If bno lies past eof, 3605 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3557 * *eofp will be set, and *prevp will contain the last entry (null if none). 3606 * *eofp will be set, and *prevp will contain the last entry (null if none).
@@ -3569,20 +3618,14 @@ xfs_bmap_search_extents(
3569 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */ 3618 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3570{ 3619{
3571 xfs_ifork_t *ifp; /* inode fork pointer */ 3620 xfs_ifork_t *ifp; /* inode fork pointer */
3572 xfs_bmbt_rec_t *base; /* base of extent list */
3573 xfs_extnum_t lastx; /* last extent index used */
3574 xfs_extnum_t nextents; /* number of file extents */
3575 xfs_bmbt_rec_t *ep; /* extent record pointer */ 3621 xfs_bmbt_rec_t *ep; /* extent record pointer */
3576 int rt; /* realtime flag */ 3622 int rt; /* realtime flag */
3577 3623
3578 XFS_STATS_INC(xs_look_exlist); 3624 XFS_STATS_INC(xs_look_exlist);
3579 ifp = XFS_IFORK_PTR(ip, whichfork); 3625 ifp = XFS_IFORK_PTR(ip, whichfork);
3580 lastx = ifp->if_lastex;
3581 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3582 base = &ifp->if_u1.if_extents[0];
3583 3626
3584 ep = xfs_bmap_do_search_extents(base, lastx, nextents, bno, eofp, 3627 ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp);
3585 lastxp, gotp, prevp); 3628
3586 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip); 3629 rt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
3587 if (unlikely(!rt && !gotp->br_startblock && (*lastxp != NULLEXTNUM))) { 3630 if (unlikely(!rt && !gotp->br_startblock && (*lastxp != NULLEXTNUM))) {
3588 cmn_err(CE_PANIC,"Access to block zero: fs: <%s> inode: %lld " 3631 cmn_err(CE_PANIC,"Access to block zero: fs: <%s> inode: %lld "
diff --git a/fs/xfs/xfs_bmap.h b/fs/xfs/xfs_bmap.h
index 4c05f95452c2..011ccaa9a1c0 100644
--- a/fs/xfs/xfs_bmap.h
+++ b/fs/xfs/xfs_bmap.h
@@ -352,6 +352,24 @@ xfs_check_nostate_extents(
352 xfs_extnum_t idx, 352 xfs_extnum_t idx,
353 xfs_extnum_t num); 353 xfs_extnum_t num);
354 354
355/*
356 * Call xfs_bmap_do_search_extents() to search for the extent
357 * record containing block bno. If in multi-level in-core extent
358 * allocation mode, find and extract the target extent buffer,
359 * otherwise just use the direct extent list.
360 */
361xfs_bmbt_rec_t *
362xfs_bmap_search_multi_extents(struct xfs_ifork *, xfs_fileoff_t, int *,
363 xfs_extnum_t *, xfs_bmbt_irec_t *, xfs_bmbt_irec_t *);
364
365/*
366 * Search an extent list for the extent which includes block
367 * bno.
368 */
369xfs_bmbt_rec_t *xfs_bmap_do_search_extents(xfs_bmbt_rec_t *,
370 xfs_extnum_t, xfs_extnum_t, xfs_fileoff_t, int *,
371 xfs_extnum_t *, xfs_bmbt_irec_t *, xfs_bmbt_irec_t *);
372
355#endif /* __KERNEL__ */ 373#endif /* __KERNEL__ */
356 374
357#endif /* __XFS_BMAP_H__ */ 375#endif /* __XFS_BMAP_H__ */
diff --git a/fs/xfs/xfs_bmap_btree.h b/fs/xfs/xfs_bmap_btree.h
index e095a2d344ae..6478cfa0e539 100644
--- a/fs/xfs/xfs_bmap_btree.h
+++ b/fs/xfs/xfs_bmap_btree.h
@@ -372,14 +372,6 @@ extern int xfs_bmbt_get_rec(struct xfs_btree_cur *, xfs_fileoff_t *,
372 xfs_exntst_t *, int *); 372 xfs_exntst_t *, int *);
373#endif 373#endif
374 374
375/*
376 * Search an extent list for the extent which includes block
377 * bno.
378 */
379xfs_bmbt_rec_t *xfs_bmap_do_search_extents(xfs_bmbt_rec_t *,
380 xfs_extnum_t, xfs_extnum_t, xfs_fileoff_t, int *,
381 xfs_extnum_t *, xfs_bmbt_irec_t *, xfs_bmbt_irec_t *);
382
383#endif /* __KERNEL__ */ 375#endif /* __KERNEL__ */
384 376
385#endif /* __XFS_BMAP_BTREE_H__ */ 377#endif /* __XFS_BMAP_BTREE_H__ */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 6459395a0e40..580fa0758039 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2630,8 +2630,9 @@ xfs_idestroy_fork(
2630 ifp->if_real_bytes = 0; 2630 ifp->if_real_bytes = 0;
2631 } 2631 }
2632 } else if ((ifp->if_flags & XFS_IFEXTENTS) && 2632 } else if ((ifp->if_flags & XFS_IFEXTENTS) &&
2633 (ifp->if_u1.if_extents != NULL) && 2633 ((ifp->if_flags & XFS_IFEXTIREC) ||
2634 (ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext)) { 2634 ((ifp->if_u1.if_extents != NULL) &&
2635 (ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext)))) {
2635 ASSERT(ifp->if_real_bytes != 0); 2636 ASSERT(ifp->if_real_bytes != 0);
2636 xfs_iext_destroy(ifp); 2637 xfs_iext_destroy(ifp);
2637 } 2638 }
@@ -3622,7 +3623,16 @@ xfs_iext_get_ext(
3622 xfs_extnum_t idx) /* index of target extent */ 3623 xfs_extnum_t idx) /* index of target extent */
3623{ 3624{
3624 ASSERT(idx >= 0); 3625 ASSERT(idx >= 0);
3625 if (ifp->if_bytes) { 3626 if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) {
3627 return ifp->if_u1.if_ext_irec->er_extbuf;
3628 } else if (ifp->if_flags & XFS_IFEXTIREC) {
3629 xfs_ext_irec_t *erp; /* irec pointer */
3630 int erp_idx = 0; /* irec index */
3631 xfs_extnum_t page_idx = idx; /* ext index in target list */
3632
3633 erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0);
3634 return &erp->er_extbuf[page_idx];
3635 } else if (ifp->if_bytes) {
3626 return &ifp->if_u1.if_extents[idx]; 3636 return &ifp->if_u1.if_extents[idx];
3627 } else { 3637 } else {
3628 return NULL; 3638 return NULL;
@@ -3691,6 +3701,7 @@ xfs_iext_add(
3691 } 3701 }
3692 ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext; 3702 ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
3693 ifp->if_real_bytes = 0; 3703 ifp->if_real_bytes = 0;
3704 ifp->if_lastex = nextents + ext_diff;
3694 } 3705 }
3695 /* 3706 /*
3696 * Otherwise use a linear (direct) extent list. 3707 * Otherwise use a linear (direct) extent list.
@@ -3698,7 +3709,7 @@ xfs_iext_add(
3698 * xfs_iext_realloc_direct will switch us from 3709 * xfs_iext_realloc_direct will switch us from
3699 * inline to direct extent allocation mode. 3710 * inline to direct extent allocation mode.
3700 */ 3711 */
3701 else { 3712 else if (nextents + ext_diff <= XFS_LINEAR_EXTS) {
3702 xfs_iext_realloc_direct(ifp, new_size); 3713 xfs_iext_realloc_direct(ifp, new_size);
3703 if (idx < nextents) { 3714 if (idx < nextents) {
3704 memmove(&ifp->if_u1.if_extents[idx + ext_diff], 3715 memmove(&ifp->if_u1.if_extents[idx + ext_diff],
@@ -3707,14 +3718,182 @@ xfs_iext_add(
3707 memset(&ifp->if_u1.if_extents[idx], 0, byte_diff); 3718 memset(&ifp->if_u1.if_extents[idx], 0, byte_diff);
3708 } 3719 }
3709 } 3720 }
3721 /* Indirection array */
3722 else {
3723 xfs_ext_irec_t *erp;
3724 int erp_idx = 0;
3725 int page_idx = idx;
3726
3727 ASSERT(nextents + ext_diff > XFS_LINEAR_EXTS);
3728 if (ifp->if_flags & XFS_IFEXTIREC) {
3729 erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 1);
3730 } else {
3731 xfs_iext_irec_init(ifp);
3732 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
3733 erp = ifp->if_u1.if_ext_irec;
3734 }
3735 /* Extents fit in target extent page */
3736 if (erp && erp->er_extcount + ext_diff <= XFS_LINEAR_EXTS) {
3737 if (page_idx < erp->er_extcount) {
3738 memmove(&erp->er_extbuf[page_idx + ext_diff],
3739 &erp->er_extbuf[page_idx],
3740 (erp->er_extcount - page_idx) *
3741 sizeof(xfs_bmbt_rec_t));
3742 memset(&erp->er_extbuf[page_idx], 0, byte_diff);
3743 }
3744 erp->er_extcount += ext_diff;
3745 xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
3746 }
3747 /* Insert a new extent page */
3748 else if (erp) {
3749 xfs_iext_add_indirect_multi(ifp,
3750 erp_idx, page_idx, ext_diff);
3751 }
3752 /*
3753 * If extent(s) are being appended to the last page in
3754 * the indirection array and the new extent(s) don't fit
3755 * in the page, then erp is NULL and erp_idx is set to
3756 * the next index needed in the indirection array.
3757 */
3758 else {
3759 int count = ext_diff;
3760
3761 while (count) {
3762 erp = xfs_iext_irec_new(ifp, erp_idx);
3763 erp->er_extcount = count;
3764 count -= MIN(count, (int)XFS_LINEAR_EXTS);
3765 if (count) {
3766 erp_idx++;
3767 }
3768 }
3769 }
3770 }
3710 ifp->if_bytes = new_size; 3771 ifp->if_bytes = new_size;
3711} 3772}
3712 3773
3713/* 3774/*
3775 * This is called when incore extents are being added to the indirection
3776 * array and the new extents do not fit in the target extent list. The
3777 * erp_idx parameter contains the irec index for the target extent list
3778 * in the indirection array, and the idx parameter contains the extent
3779 * index within the list. The number of extents being added is stored
3780 * in the count parameter.
3781 *
3782 * |-------| |-------|
3783 * | | | | idx - number of extents before idx
3784 * | idx | | count |
3785 * | | | | count - number of extents being inserted at idx
3786 * |-------| |-------|
3787 * | count | | nex2 | nex2 - number of extents after idx + count
3788 * |-------| |-------|
3789 */
3790void
3791xfs_iext_add_indirect_multi(
3792 xfs_ifork_t *ifp, /* inode fork pointer */
3793 int erp_idx, /* target extent irec index */
3794 xfs_extnum_t idx, /* index within target list */
3795 int count) /* new extents being added */
3796{
3797 int byte_diff; /* new bytes being added */
3798 xfs_ext_irec_t *erp; /* pointer to irec entry */
3799 xfs_extnum_t ext_diff; /* number of extents to add */
3800 xfs_extnum_t ext_cnt; /* new extents still needed */
3801 xfs_extnum_t nex2; /* extents after idx + count */
3802 xfs_bmbt_rec_t *nex2_ep = NULL; /* temp list for nex2 extents */
3803 int nlists; /* number of irec's (lists) */
3804
3805 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
3806 erp = &ifp->if_u1.if_ext_irec[erp_idx];
3807 nex2 = erp->er_extcount - idx;
3808 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
3809
3810 /*
3811 * Save second part of target extent list
3812 * (all extents past */
3813 if (nex2) {
3814 byte_diff = nex2 * sizeof(xfs_bmbt_rec_t);
3815 nex2_ep = (xfs_bmbt_rec_t *) kmem_alloc(byte_diff, KM_SLEEP);
3816 memmove(nex2_ep, &erp->er_extbuf[idx], byte_diff);
3817 erp->er_extcount -= nex2;
3818 xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -nex2);
3819 memset(&erp->er_extbuf[idx], 0, byte_diff);
3820 }
3821
3822 /*
3823 * Add the new extents to the end of the target
3824 * list, then allocate new irec record(s) and
3825 * extent buffer(s) as needed to store the rest
3826 * of the new extents.
3827 */
3828 ext_cnt = count;
3829 ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS - erp->er_extcount);
3830 if (ext_diff) {
3831 erp->er_extcount += ext_diff;
3832 xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
3833 ext_cnt -= ext_diff;
3834 }
3835 while (ext_cnt) {
3836 erp_idx++;
3837 erp = xfs_iext_irec_new(ifp, erp_idx);
3838 ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS);
3839 erp->er_extcount = ext_diff;
3840 xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
3841 ext_cnt -= ext_diff;
3842 }
3843
3844 /* Add nex2 extents back to indirection array */
3845 if (nex2) {
3846 xfs_extnum_t ext_avail;
3847 int i;
3848
3849 byte_diff = nex2 * sizeof(xfs_bmbt_rec_t);
3850 ext_avail = XFS_LINEAR_EXTS - erp->er_extcount;
3851 i = 0;
3852 /*
3853 * If nex2 extents fit in the current page, append
3854 * nex2_ep after the new extents.
3855 */
3856 if (nex2 <= ext_avail) {
3857 i = erp->er_extcount;
3858 }
3859 /*
3860 * Otherwise, check if space is available in the
3861 * next page.
3862 */
3863 else if ((erp_idx < nlists - 1) &&
3864 (nex2 <= (ext_avail = XFS_LINEAR_EXTS -
3865 ifp->if_u1.if_ext_irec[erp_idx+1].er_extcount))) {
3866 erp_idx++;
3867 erp++;
3868 /* Create a hole for nex2 extents */
3869 memmove(&erp->er_extbuf[nex2], erp->er_extbuf,
3870 erp->er_extcount * sizeof(xfs_bmbt_rec_t));
3871 }
3872 /*
3873 * Final choice, create a new extent page for
3874 * nex2 extents.
3875 */
3876 else {
3877 erp_idx++;
3878 erp = xfs_iext_irec_new(ifp, erp_idx);
3879 }
3880 memmove(&erp->er_extbuf[i], nex2_ep, byte_diff);
3881 kmem_free(nex2_ep, byte_diff);
3882 erp->er_extcount += nex2;
3883 xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, nex2);
3884 }
3885}
3886
3887/*
3714 * This is called when the amount of space required for incore file 3888 * This is called when the amount of space required for incore file
3715 * extents needs to be decreased. The ext_diff parameter stores the 3889 * extents needs to be decreased. The ext_diff parameter stores the
3716 * number of extents to be removed and the idx parameter contains 3890 * number of extents to be removed and the idx parameter contains
3717 * the extent index where the extents will be removed from. 3891 * the extent index where the extents will be removed from.
3892 *
3893 * If the amount of space needed has decreased below the linear
3894 * limit, XFS_IEXT_BUFSZ, then switch to using the contiguous
3895 * extent array. Otherwise, use kmem_realloc() to adjust the
3896 * size to what is needed.
3718 */ 3897 */
3719void 3898void
3720xfs_iext_remove( 3899xfs_iext_remove(
@@ -3731,6 +3910,8 @@ xfs_iext_remove(
3731 3910
3732 if (new_size == 0) { 3911 if (new_size == 0) {
3733 xfs_iext_destroy(ifp); 3912 xfs_iext_destroy(ifp);
3913 } else if (ifp->if_flags & XFS_IFEXTIREC) {
3914 xfs_iext_remove_indirect(ifp, idx, ext_diff);
3734 } else if (ifp->if_real_bytes) { 3915 } else if (ifp->if_real_bytes) {
3735 xfs_iext_remove_direct(ifp, idx, ext_diff); 3916 xfs_iext_remove_direct(ifp, idx, ext_diff);
3736 } else { 3917 } else {
@@ -3751,6 +3932,7 @@ xfs_iext_remove_inline(
3751{ 3932{
3752 int nextents; /* number of extents in file */ 3933 int nextents; /* number of extents in file */
3753 3934
3935 ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
3754 ASSERT(idx < XFS_INLINE_EXTS); 3936 ASSERT(idx < XFS_INLINE_EXTS);
3755 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); 3937 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3756 ASSERT(((nextents - ext_diff) > 0) && 3938 ASSERT(((nextents - ext_diff) > 0) &&
@@ -3788,6 +3970,7 @@ xfs_iext_remove_direct(
3788 xfs_extnum_t nextents; /* number of extents in file */ 3970 xfs_extnum_t nextents; /* number of extents in file */
3789 int new_size; /* size of extents after removal */ 3971 int new_size; /* size of extents after removal */
3790 3972
3973 ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
3791 new_size = ifp->if_bytes - 3974 new_size = ifp->if_bytes -
3792 (ext_diff * sizeof(xfs_bmbt_rec_t)); 3975 (ext_diff * sizeof(xfs_bmbt_rec_t));
3793 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); 3976 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
@@ -3816,6 +3999,84 @@ xfs_iext_remove_direct(
3816} 3999}
3817 4000
3818/* 4001/*
4002 * This is called when incore extents are being removed from the
4003 * indirection array and the extents being removed span multiple extent
4004 * buffers. The idx parameter contains the file extent index where we
4005 * want to begin removing extents, and the count parameter contains
4006 * how many extents need to be removed.
4007 *
4008 * |-------| |-------|
4009 * | nex1 | | | nex1 - number of extents before idx
4010 * |-------| | count |
4011 * | | | | count - number of extents being removed at idx
4012 * | count | |-------|
4013 * | | | nex2 | nex2 - number of extents after idx + count
4014 * |-------| |-------|
4015 */
4016void
4017xfs_iext_remove_indirect(
4018 xfs_ifork_t *ifp, /* inode fork pointer */
4019 xfs_extnum_t idx, /* index to begin removing extents */
4020 int count) /* number of extents to remove */
4021{
4022 xfs_ext_irec_t *erp; /* indirection array pointer */
4023 int erp_idx = 0; /* indirection array index */
4024 xfs_extnum_t ext_cnt; /* extents left to remove */
4025 xfs_extnum_t ext_diff; /* extents to remove in current list */
4026 xfs_extnum_t nex1; /* number of extents before idx */
4027 xfs_extnum_t nex2; /* extents after idx + count */
4028 int nlists; /* entries in indirecton array */
4029 int page_idx = idx; /* index in target extent list */
4030
4031 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4032 erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0);
4033 ASSERT(erp != NULL);
4034 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4035 nex1 = page_idx;
4036 ext_cnt = count;
4037 while (ext_cnt) {
4038 nex2 = MAX((erp->er_extcount - (nex1 + ext_cnt)), 0);
4039 ext_diff = MIN(ext_cnt, (erp->er_extcount - nex1));
4040 /*
4041 * Check for deletion of entire list;
4042 * xfs_iext_irec_remove() updates extent offsets.
4043 */
4044 if (ext_diff == erp->er_extcount) {
4045 xfs_iext_irec_remove(ifp, erp_idx);
4046 ext_cnt -= ext_diff;
4047 nex1 = 0;
4048 if (ext_cnt) {
4049 ASSERT(erp_idx < ifp->if_real_bytes /
4050 XFS_IEXT_BUFSZ);
4051 erp = &ifp->if_u1.if_ext_irec[erp_idx];
4052 nex1 = 0;
4053 continue;
4054 } else {
4055 break;
4056 }
4057 }
4058 /* Move extents up (if needed) */
4059 if (nex2) {
4060 memmove(&erp->er_extbuf[nex1],
4061 &erp->er_extbuf[nex1 + ext_diff],
4062 nex2 * sizeof(xfs_bmbt_rec_t));
4063 }
4064 /* Zero out rest of page */
4065 memset(&erp->er_extbuf[nex1 + nex2], 0, (XFS_IEXT_BUFSZ -
4066 ((nex1 + nex2) * sizeof(xfs_bmbt_rec_t))));
4067 /* Update remaining counters */
4068 erp->er_extcount -= ext_diff;
4069 xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -ext_diff);
4070 ext_cnt -= ext_diff;
4071 nex1 = 0;
4072 erp_idx++;
4073 erp++;
4074 }
4075 ifp->if_bytes -= count * sizeof(xfs_bmbt_rec_t);
4076 xfs_iext_irec_compact(ifp);
4077}
4078
4079/*
3819 * Create, destroy, or resize a linear (direct) block of extents. 4080 * Create, destroy, or resize a linear (direct) block of extents.
3820 */ 4081 */
3821void 4082void
@@ -3827,6 +4088,10 @@ xfs_iext_realloc_direct(
3827 4088
3828 rnew_size = new_size; 4089 rnew_size = new_size;
3829 4090
4091 ASSERT(!(ifp->if_flags & XFS_IFEXTIREC) ||
4092 ((new_size >= 0) && (new_size <= XFS_IEXT_BUFSZ) &&
4093 (new_size != ifp->if_real_bytes)));
4094
3830 /* Free extent records */ 4095 /* Free extent records */
3831 if (new_size == 0) { 4096 if (new_size == 0) {
3832 xfs_iext_destroy(ifp); 4097 xfs_iext_destroy(ifp);
@@ -3920,13 +4185,76 @@ xfs_iext_inline_to_direct(
3920} 4185}
3921 4186
3922/* 4187/*
4188 * Resize an extent indirection array to new_size bytes.
4189 */
4190void
4191xfs_iext_realloc_indirect(
4192 xfs_ifork_t *ifp, /* inode fork pointer */
4193 int new_size) /* new indirection array size */
4194{
4195 int nlists; /* number of irec's (ex lists) */
4196 int size; /* current indirection array size */
4197
4198 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4199 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4200 size = nlists * sizeof(xfs_ext_irec_t);
4201 ASSERT(ifp->if_real_bytes);
4202 ASSERT((new_size >= 0) && (new_size != size));
4203 if (new_size == 0) {
4204 xfs_iext_destroy(ifp);
4205 } else {
4206 ifp->if_u1.if_ext_irec = (xfs_ext_irec_t *)
4207 kmem_realloc(ifp->if_u1.if_ext_irec,
4208 new_size, size, KM_SLEEP);
4209 }
4210}
4211
4212/*
4213 * Switch from indirection array to linear (direct) extent allocations.
4214 */
4215void
4216xfs_iext_indirect_to_direct(
4217 xfs_ifork_t *ifp) /* inode fork pointer */
4218{
4219 xfs_bmbt_rec_t *ep; /* extent record pointer */
4220 xfs_extnum_t nextents; /* number of extents in file */
4221 int size; /* size of file extents */
4222
4223 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4224 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4225 ASSERT(nextents <= XFS_LINEAR_EXTS);
4226 size = nextents * sizeof(xfs_bmbt_rec_t);
4227
4228 xfs_iext_irec_compact_full(ifp);
4229 ASSERT(ifp->if_real_bytes == XFS_IEXT_BUFSZ);
4230
4231 ep = ifp->if_u1.if_ext_irec->er_extbuf;
4232 kmem_free(ifp->if_u1.if_ext_irec, sizeof(xfs_ext_irec_t));
4233 ifp->if_flags &= ~XFS_IFEXTIREC;
4234 ifp->if_u1.if_extents = ep;
4235 ifp->if_bytes = size;
4236 if (nextents < XFS_LINEAR_EXTS) {
4237 xfs_iext_realloc_direct(ifp, size);
4238 }
4239}
4240
4241/*
3923 * Free incore file extents. 4242 * Free incore file extents.
3924 */ 4243 */
3925void 4244void
3926xfs_iext_destroy( 4245xfs_iext_destroy(
3927 xfs_ifork_t *ifp) /* inode fork pointer */ 4246 xfs_ifork_t *ifp) /* inode fork pointer */
3928{ 4247{
3929 if (ifp->if_real_bytes) { 4248 if (ifp->if_flags & XFS_IFEXTIREC) {
4249 int erp_idx;
4250 int nlists;
4251
4252 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4253 for (erp_idx = nlists - 1; erp_idx >= 0 ; erp_idx--) {
4254 xfs_iext_irec_remove(ifp, erp_idx);
4255 }
4256 ifp->if_flags &= ~XFS_IFEXTIREC;
4257 } else if (ifp->if_real_bytes) {
3930 kmem_free(ifp->if_u1.if_extents, ifp->if_real_bytes); 4258 kmem_free(ifp->if_u1.if_extents, ifp->if_real_bytes);
3931 } else if (ifp->if_bytes) { 4259 } else if (ifp->if_bytes) {
3932 memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS * 4260 memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS *
@@ -3936,3 +4264,380 @@ xfs_iext_destroy(
3936 ifp->if_real_bytes = 0; 4264 ifp->if_real_bytes = 0;
3937 ifp->if_bytes = 0; 4265 ifp->if_bytes = 0;
3938} 4266}
4267
4268/*
4269 * Return a pointer to the indirection array entry containing the
4270 * extent record for filesystem block bno. Store the index of the
4271 * target irec in *erp_idxp.
4272 */
4273xfs_ext_irec_t *
4274xfs_iext_bno_to_irec(
4275 xfs_ifork_t *ifp, /* inode fork pointer */
4276 xfs_fileoff_t bno, /* block number to search for */
4277 int *erp_idxp) /* irec index of target ext list */
4278{
4279 xfs_ext_irec_t *erp = NULL; /* indirection array pointer */
4280 xfs_ext_irec_t *erp_next; /* next indirection array entry */
4281 xfs_extnum_t erp_idx; /* indirection array index */
4282 int nlists; /* number of extent irec's (lists) */
4283 int high; /* binary search upper limit */
4284 int low; /* binary search lower limit */
4285
4286 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4287 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4288 erp_idx = 0;
4289 low = 0;
4290 high = nlists - 1;
4291 while (low <= high) {
4292 erp_idx = (low + high) >> 1;
4293 erp = &ifp->if_u1.if_ext_irec[erp_idx];
4294 erp_next = erp_idx < nlists - 1 ? erp + 1 : NULL;
4295 if (bno < xfs_bmbt_get_startoff(erp->er_extbuf)) {
4296 high = erp_idx - 1;
4297 } else if (erp_next && bno >=
4298 xfs_bmbt_get_startoff(erp_next->er_extbuf)) {
4299 low = erp_idx + 1;
4300 } else {
4301 break;
4302 }
4303 }
4304 *erp_idxp = erp_idx;
4305 return erp;
4306}
4307
4308/*
4309 * Return a pointer to the indirection array entry containing the
4310 * extent record at file extent index *idxp. Store the index of the
4311 * target irec in *erp_idxp and store the page index of the target
4312 * extent record in *idxp.
4313 */
4314xfs_ext_irec_t *
4315xfs_iext_idx_to_irec(
4316 xfs_ifork_t *ifp, /* inode fork pointer */
4317 xfs_extnum_t *idxp, /* extent index (file -> page) */
4318 int *erp_idxp, /* pointer to target irec */
4319 int realloc) /* new bytes were just added */
4320{
4321 xfs_ext_irec_t *prev; /* pointer to previous irec */
4322 xfs_ext_irec_t *erp = NULL; /* pointer to current irec */
4323 int erp_idx; /* indirection array index */
4324 int nlists; /* number of irec's (ex lists) */
4325 int high; /* binary search upper limit */
4326 int low; /* binary search lower limit */
4327 xfs_extnum_t page_idx = *idxp; /* extent index in target list */
4328
4329 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4330 ASSERT(page_idx >= 0 && page_idx <=
4331 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
4332 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4333 erp_idx = 0;
4334 low = 0;
4335 high = nlists - 1;
4336
4337 /* Binary search extent irec's */
4338 while (low <= high) {
4339 erp_idx = (low + high) >> 1;
4340 erp = &ifp->if_u1.if_ext_irec[erp_idx];
4341 prev = erp_idx > 0 ? erp - 1 : NULL;
4342 if (page_idx < erp->er_extoff || (page_idx == erp->er_extoff &&
4343 realloc && prev && prev->er_extcount < XFS_LINEAR_EXTS)) {
4344 high = erp_idx - 1;
4345 } else if (page_idx > erp->er_extoff + erp->er_extcount ||
4346 (page_idx == erp->er_extoff + erp->er_extcount &&
4347 !realloc)) {
4348 low = erp_idx + 1;
4349 } else if (page_idx == erp->er_extoff + erp->er_extcount &&
4350 erp->er_extcount == XFS_LINEAR_EXTS) {
4351 ASSERT(realloc);
4352 page_idx = 0;
4353 erp_idx++;
4354 erp = erp_idx < nlists ? erp + 1 : NULL;
4355 break;
4356 } else {
4357 page_idx -= erp->er_extoff;
4358 break;
4359 }
4360 }
4361 *idxp = page_idx;
4362 *erp_idxp = erp_idx;
4363 return(erp);
4364}
4365
4366/*
4367 * Allocate and initialize an indirection array once the space needed
4368 * for incore extents increases above XFS_IEXT_BUFSZ.
4369 */
4370void
4371xfs_iext_irec_init(
4372 xfs_ifork_t *ifp) /* inode fork pointer */
4373{
4374 xfs_ext_irec_t *erp; /* indirection array pointer */
4375 xfs_extnum_t nextents; /* number of extents in file */
4376
4377 ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
4378 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4379 ASSERT(nextents <= XFS_LINEAR_EXTS);
4380
4381 erp = (xfs_ext_irec_t *)
4382 kmem_alloc(sizeof(xfs_ext_irec_t), KM_SLEEP);
4383
4384 if (nextents == 0) {
4385 ifp->if_u1.if_extents = (xfs_bmbt_rec_t *)
4386 kmem_alloc(XFS_IEXT_BUFSZ, KM_SLEEP);
4387 } else if (!ifp->if_real_bytes) {
4388 xfs_iext_inline_to_direct(ifp, XFS_IEXT_BUFSZ);
4389 } else if (ifp->if_real_bytes < XFS_IEXT_BUFSZ) {
4390 xfs_iext_realloc_direct(ifp, XFS_IEXT_BUFSZ);
4391 }
4392 erp->er_extbuf = ifp->if_u1.if_extents;
4393 erp->er_extcount = nextents;
4394 erp->er_extoff = 0;
4395
4396 ifp->if_flags |= XFS_IFEXTIREC;
4397 ifp->if_real_bytes = XFS_IEXT_BUFSZ;
4398 ifp->if_bytes = nextents * sizeof(xfs_bmbt_rec_t);
4399 ifp->if_u1.if_ext_irec = erp;
4400
4401 return;
4402}
4403
4404/*
4405 * Allocate and initialize a new entry in the indirection array.
4406 */
4407xfs_ext_irec_t *
4408xfs_iext_irec_new(
4409 xfs_ifork_t *ifp, /* inode fork pointer */
4410 int erp_idx) /* index for new irec */
4411{
4412 xfs_ext_irec_t *erp; /* indirection array pointer */
4413 int i; /* loop counter */
4414 int nlists; /* number of irec's (ex lists) */
4415
4416 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4417 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4418
4419 /* Resize indirection array */
4420 xfs_iext_realloc_indirect(ifp, ++nlists *
4421 sizeof(xfs_ext_irec_t));
4422 /*
4423 * Move records down in the array so the
4424 * new page can use erp_idx.
4425 */
4426 erp = ifp->if_u1.if_ext_irec;
4427 for (i = nlists - 1; i > erp_idx; i--) {
4428 memmove(&erp[i], &erp[i-1], sizeof(xfs_ext_irec_t));
4429 }
4430 ASSERT(i == erp_idx);
4431
4432 /* Initialize new extent record */
4433 erp = ifp->if_u1.if_ext_irec;
4434 erp[erp_idx].er_extbuf = (xfs_bmbt_rec_t *)
4435 kmem_alloc(XFS_IEXT_BUFSZ, KM_SLEEP);
4436 ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ;
4437 memset(erp[erp_idx].er_extbuf, 0, XFS_IEXT_BUFSZ);
4438 erp[erp_idx].er_extcount = 0;
4439 erp[erp_idx].er_extoff = erp_idx > 0 ?
4440 erp[erp_idx-1].er_extoff + erp[erp_idx-1].er_extcount : 0;
4441 return (&erp[erp_idx]);
4442}
4443
4444/*
4445 * Remove a record from the indirection array.
4446 */
4447void
4448xfs_iext_irec_remove(
4449 xfs_ifork_t *ifp, /* inode fork pointer */
4450 int erp_idx) /* irec index to remove */
4451{
4452 xfs_ext_irec_t *erp; /* indirection array pointer */
4453 int i; /* loop counter */
4454 int nlists; /* number of irec's (ex lists) */
4455
4456 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4457 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4458 erp = &ifp->if_u1.if_ext_irec[erp_idx];
4459 if (erp->er_extbuf) {
4460 xfs_iext_irec_update_extoffs(ifp, erp_idx + 1,
4461 -erp->er_extcount);
4462 kmem_free(erp->er_extbuf, XFS_IEXT_BUFSZ);
4463 }
4464 /* Compact extent records */
4465 erp = ifp->if_u1.if_ext_irec;
4466 for (i = erp_idx; i < nlists - 1; i++) {
4467 memmove(&erp[i], &erp[i+1], sizeof(xfs_ext_irec_t));
4468 }
4469 /*
4470 * Manually free the last extent record from the indirection
4471 * array. A call to xfs_iext_realloc_indirect() with a size
4472 * of zero would result in a call to xfs_iext_destroy() which
4473 * would in turn call this function again, creating a nasty
4474 * infinite loop.
4475 */
4476 if (--nlists) {
4477 xfs_iext_realloc_indirect(ifp,
4478 nlists * sizeof(xfs_ext_irec_t));
4479 } else {
4480 kmem_free(ifp->if_u1.if_ext_irec,
4481 sizeof(xfs_ext_irec_t));
4482 }
4483 ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ;
4484}
4485
4486/*
4487 * This is called to clean up large amounts of unused memory allocated
4488 * by the indirection array. Before compacting anything though, verify
4489 * that the indirection array is still needed and switch back to the
4490 * linear extent list (or even the inline buffer) if possible. The
4491 * compaction policy is as follows:
4492 *
4493 * Full Compaction: Extents fit into a single page (or inline buffer)
4494 * Full Compaction: Extents occupy less than 10% of allocated space
4495 * Partial Compaction: Extents occupy > 10% and < 50% of allocated space
4496 * No Compaction: Extents occupy at least 50% of allocated space
4497 */
4498void
4499xfs_iext_irec_compact(
4500 xfs_ifork_t *ifp) /* inode fork pointer */
4501{
4502 xfs_extnum_t nextents; /* number of extents in file */
4503 int nlists; /* number of irec's (ex lists) */
4504
4505 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4506 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4507 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4508
4509 if (nextents == 0) {
4510 xfs_iext_destroy(ifp);
4511 } else if (nextents <= XFS_INLINE_EXTS) {
4512 xfs_iext_indirect_to_direct(ifp);
4513 xfs_iext_direct_to_inline(ifp, nextents);
4514 } else if (nextents <= XFS_LINEAR_EXTS) {
4515 xfs_iext_indirect_to_direct(ifp);
4516 } else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 3) {
4517 xfs_iext_irec_compact_full(ifp);
4518 } else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 1) {
4519 xfs_iext_irec_compact_pages(ifp);
4520 }
4521}
4522
4523/*
4524 * Combine extents from neighboring extent pages.
4525 */
4526void
4527xfs_iext_irec_compact_pages(
4528 xfs_ifork_t *ifp) /* inode fork pointer */
4529{
4530 xfs_ext_irec_t *erp, *erp_next;/* pointers to irec entries */
4531 int erp_idx = 0; /* indirection array index */
4532 int nlists; /* number of irec's (ex lists) */
4533
4534 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4535 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4536 while (erp_idx < nlists - 1) {
4537 erp = &ifp->if_u1.if_ext_irec[erp_idx];
4538 erp_next = erp + 1;
4539 if (erp_next->er_extcount <=
4540 (XFS_LINEAR_EXTS - erp->er_extcount)) {
4541 memmove(&erp->er_extbuf[erp->er_extcount],
4542 erp_next->er_extbuf, erp_next->er_extcount *
4543 sizeof(xfs_bmbt_rec_t));
4544 erp->er_extcount += erp_next->er_extcount;
4545 /*
4546 * Free page before removing extent record
4547 * so er_extoffs don't get modified in
4548 * xfs_iext_irec_remove.
4549 */
4550 kmem_free(erp_next->er_extbuf, XFS_IEXT_BUFSZ);
4551 erp_next->er_extbuf = NULL;
4552 xfs_iext_irec_remove(ifp, erp_idx + 1);
4553 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4554 } else {
4555 erp_idx++;
4556 }
4557 }
4558}
4559
4560/*
4561 * Fully compact the extent records managed by the indirection array.
4562 */
4563void
4564xfs_iext_irec_compact_full(
4565 xfs_ifork_t *ifp) /* inode fork pointer */
4566{
4567 xfs_bmbt_rec_t *ep, *ep_next; /* extent record pointers */
4568 xfs_ext_irec_t *erp, *erp_next; /* extent irec pointers */
4569 int erp_idx = 0; /* extent irec index */
4570 int ext_avail; /* empty entries in ex list */
4571 int ext_diff; /* number of exts to add */
4572 int nlists; /* number of irec's (ex lists) */
4573
4574 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4575 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4576 erp = ifp->if_u1.if_ext_irec;
4577 ep = &erp->er_extbuf[erp->er_extcount];
4578 erp_next = erp + 1;
4579 ep_next = erp_next->er_extbuf;
4580 while (erp_idx < nlists - 1) {
4581 ext_avail = XFS_LINEAR_EXTS - erp->er_extcount;
4582 ext_diff = MIN(ext_avail, erp_next->er_extcount);
4583 memcpy(ep, ep_next, ext_diff * sizeof(xfs_bmbt_rec_t));
4584 erp->er_extcount += ext_diff;
4585 erp_next->er_extcount -= ext_diff;
4586 /* Remove next page */
4587 if (erp_next->er_extcount == 0) {
4588 /*
4589 * Free page before removing extent record
4590 * so er_extoffs don't get modified in
4591 * xfs_iext_irec_remove.
4592 */
4593 kmem_free(erp_next->er_extbuf,
4594 erp_next->er_extcount * sizeof(xfs_bmbt_rec_t));
4595 erp_next->er_extbuf = NULL;
4596 xfs_iext_irec_remove(ifp, erp_idx + 1);
4597 erp = &ifp->if_u1.if_ext_irec[erp_idx];
4598 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4599 /* Update next page */
4600 } else {
4601 /* Move rest of page up to become next new page */
4602 memmove(erp_next->er_extbuf, ep_next,
4603 erp_next->er_extcount * sizeof(xfs_bmbt_rec_t));
4604 ep_next = erp_next->er_extbuf;
4605 memset(&ep_next[erp_next->er_extcount], 0,
4606 (XFS_LINEAR_EXTS - erp_next->er_extcount) *
4607 sizeof(xfs_bmbt_rec_t));
4608 }
4609 if (erp->er_extcount == XFS_LINEAR_EXTS) {
4610 erp_idx++;
4611 if (erp_idx < nlists)
4612 erp = &ifp->if_u1.if_ext_irec[erp_idx];
4613 else
4614 break;
4615 }
4616 ep = &erp->er_extbuf[erp->er_extcount];
4617 erp_next = erp + 1;
4618 ep_next = erp_next->er_extbuf;
4619 }
4620}
4621
4622/*
4623 * This is called to update the er_extoff field in the indirection
4624 * array when extents have been added or removed from one of the
4625 * extent lists. erp_idx contains the irec index to begin updating
4626 * at and ext_diff contains the number of extents that were added
4627 * or removed.
4628 */
4629void
4630xfs_iext_irec_update_extoffs(
4631 xfs_ifork_t *ifp, /* inode fork pointer */
4632 int erp_idx, /* irec index to update */
4633 int ext_diff) /* number of new extents */
4634{
4635 int i; /* loop counter */
4636 int nlists; /* number of irec's (ex lists */
4637
4638 ASSERT(ifp->if_flags & XFS_IFEXTIREC);
4639 nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
4640 for (i = erp_idx; i < nlists; i++) {
4641 ifp->if_u1.if_ext_irec[i].er_extoff += ext_diff;
4642 }
4643}
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 740b73fabd2f..3c1df1d642fa 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -25,10 +25,37 @@
25#define XFS_ATTR_FORK 1 25#define XFS_ATTR_FORK 1
26 26
27/* 27/*
28 * The following xfs_ext_irec_t struct introduces a second (top) level
29 * to the in-core extent allocation scheme. These structs are allocated
30 * in a contiguous block, creating an indirection array where each entry
31 * (irec) contains a pointer to a buffer of in-core extent records which
32 * it manages. Each extent buffer is 4k in size, since 4k is the system
33 * page size on Linux i386 and systems with larger page sizes don't seem
34 * to gain much, if anything, by using their native page size as the
35 * extent buffer size. Also, using 4k extent buffers everywhere provides
36 * a consistent interface for CXFS across different platforms.
37 *
38 * There is currently no limit on the number of irec's (extent lists)
39 * allowed, so heavily fragmented files may require an indirection array
40 * which spans multiple system pages of memory. The number of extents
41 * which would require this amount of contiguous memory is very large
42 * and should not cause problems in the foreseeable future. However,
43 * if the memory needed for the contiguous array ever becomes a problem,
44 * it is possible that a third level of indirection may be required.
45 */
46typedef struct xfs_ext_irec {
47 xfs_bmbt_rec_t *er_extbuf; /* block of extent records */
48 xfs_extnum_t er_extoff; /* extent offset in file */
49 xfs_extnum_t er_extcount; /* number of extents in page/block */
50} xfs_ext_irec_t;
51
52/*
28 * File incore extent information, present for each of data & attr forks. 53 * File incore extent information, present for each of data & attr forks.
29 */ 54 */
30#define XFS_INLINE_EXTS 2 55#define XFS_IEXT_BUFSZ 4096
31#define XFS_INLINE_DATA 32 56#define XFS_LINEAR_EXTS (XFS_IEXT_BUFSZ / (uint)sizeof(xfs_bmbt_rec_t))
57#define XFS_INLINE_EXTS 2
58#define XFS_INLINE_DATA 32
32typedef struct xfs_ifork { 59typedef struct xfs_ifork {
33 int if_bytes; /* bytes in if_u1 */ 60 int if_bytes; /* bytes in if_u1 */
34 int if_real_bytes; /* bytes allocated in if_u1 */ 61 int if_real_bytes; /* bytes allocated in if_u1 */
@@ -39,6 +66,7 @@ typedef struct xfs_ifork {
39 xfs_extnum_t if_lastex; /* last if_extents used */ 66 xfs_extnum_t if_lastex; /* last if_extents used */
40 union { 67 union {
41 xfs_bmbt_rec_t *if_extents; /* linear map file exts */ 68 xfs_bmbt_rec_t *if_extents; /* linear map file exts */
69 xfs_ext_irec_t *if_ext_irec; /* irec map file exts */
42 char *if_data; /* inline file data */ 70 char *if_data; /* inline file data */
43 } if_u1; 71 } if_u1;
44 union { 72 union {
@@ -61,9 +89,10 @@ typedef struct xfs_ifork {
61/* 89/*
62 * Per-fork incore inode flags. 90 * Per-fork incore inode flags.
63 */ 91 */
64#define XFS_IFINLINE 0x0001 /* Inline data is read in */ 92#define XFS_IFINLINE 0x01 /* Inline data is read in */
65#define XFS_IFEXTENTS 0x0002 /* All extent pointers are read in */ 93#define XFS_IFEXTENTS 0x02 /* All extent pointers are read in */
66#define XFS_IFBROOT 0x0004 /* i_broot points to the bmap b-tree root */ 94#define XFS_IFBROOT 0x04 /* i_broot points to the bmap b-tree root */
95#define XFS_IFEXTIREC 0x08 /* Indirection array of extent blocks */
67 96
68/* 97/*
69 * Flags for xfs_imap() and xfs_dilocate(). 98 * Flags for xfs_imap() and xfs_dilocate().
@@ -438,13 +467,26 @@ xfs_bmbt_rec_t *xfs_iext_get_ext(xfs_ifork_t *, xfs_extnum_t);
438void xfs_iext_insert(xfs_ifork_t *, xfs_extnum_t, xfs_extnum_t, 467void xfs_iext_insert(xfs_ifork_t *, xfs_extnum_t, xfs_extnum_t,
439 xfs_bmbt_irec_t *); 468 xfs_bmbt_irec_t *);
440void xfs_iext_add(xfs_ifork_t *, xfs_extnum_t, int); 469void xfs_iext_add(xfs_ifork_t *, xfs_extnum_t, int);
470void xfs_iext_add_indirect_multi(xfs_ifork_t *, int, xfs_extnum_t, int);
441void xfs_iext_remove(xfs_ifork_t *, xfs_extnum_t, int); 471void xfs_iext_remove(xfs_ifork_t *, xfs_extnum_t, int);
442void xfs_iext_remove_inline(xfs_ifork_t *, xfs_extnum_t, int); 472void xfs_iext_remove_inline(xfs_ifork_t *, xfs_extnum_t, int);
443void xfs_iext_remove_direct(xfs_ifork_t *, xfs_extnum_t, int); 473void xfs_iext_remove_direct(xfs_ifork_t *, xfs_extnum_t, int);
474void xfs_iext_remove_indirect(xfs_ifork_t *, xfs_extnum_t, int);
444void xfs_iext_realloc_direct(xfs_ifork_t *, int); 475void xfs_iext_realloc_direct(xfs_ifork_t *, int);
476void xfs_iext_realloc_indirect(xfs_ifork_t *, int);
477void xfs_iext_indirect_to_direct(xfs_ifork_t *);
445void xfs_iext_direct_to_inline(xfs_ifork_t *, xfs_extnum_t); 478void xfs_iext_direct_to_inline(xfs_ifork_t *, xfs_extnum_t);
446void xfs_iext_inline_to_direct(xfs_ifork_t *, int); 479void xfs_iext_inline_to_direct(xfs_ifork_t *, int);
447void xfs_iext_destroy(xfs_ifork_t *); 480void xfs_iext_destroy(xfs_ifork_t *);
481xfs_ext_irec_t *xfs_iext_bno_to_irec(xfs_ifork_t *, xfs_fileoff_t, int *);
482xfs_ext_irec_t *xfs_iext_idx_to_irec(xfs_ifork_t *, xfs_extnum_t *, int *, int);
483void xfs_iext_irec_init(xfs_ifork_t *);
484xfs_ext_irec_t *xfs_iext_irec_new(xfs_ifork_t *, int);
485void xfs_iext_irec_remove(xfs_ifork_t *, int);
486void xfs_iext_irec_compact(xfs_ifork_t *);
487void xfs_iext_irec_compact_pages(xfs_ifork_t *);
488void xfs_iext_irec_compact_full(xfs_ifork_t *);
489void xfs_iext_irec_update_extoffs(xfs_ifork_t *, int, int);
448 490
449#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount)) 491#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount))
450 492
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-25 01:21:40 -0400