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61 lines
2.5 KiB
Diff
61 lines
2.5 KiB
Diff
From cda0a857dd7a27cd5d621747464bfe71e8727fff Mon Sep 17 00:00:00 2001
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From: Daniel Kiper <daniel.kiper@oracle.com>
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Date: Tue, 29 May 2018 16:16:02 +0200
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Subject: xfs: Accept filesystem with sparse inodes
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The sparse inode metadata format became a mkfs.xfs default in
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xfsprogs-4.16.0, and such filesystems are now rejected by grub as
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containing an incompatible feature.
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In essence, this feature allows xfs to allocate inodes into fragmented
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freespace. (Without this feature, if xfs could not allocate contiguous
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space for 64 new inodes, inode creation would fail.)
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In practice, the disk format change is restricted to the inode btree,
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which as far as I can tell is not used by grub. If all you're doing
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today is parsing a directory, reading an inode number, and converting
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that inode number to a disk location, then ignoring this feature
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should be fine, so I've added it to XFS_SB_FEAT_INCOMPAT_SUPPORTED
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I did some brief testing of this patch by hacking up the regression
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tests to completely fragment freespace on the test xfs filesystem, and
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then write a large-ish number of inodes to consume any existing
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contiguous 64-inode chunk. This way any files the grub tests add and
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traverse would be in such a fragmented inode allocation. Tests passed,
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but I'm not sure how to cleanly integrate that into the test harness.
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Signed-off-by: Eric Sandeen <sandeen@redhat.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Tested-by: Chris Murphy <lists@colorremedies.com>
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---
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grub-core/fs/xfs.c | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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diff --git a/grub-core/fs/xfs.c b/grub-core/fs/xfs.c
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index c6031bd..3b00c74 100644
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--- a/grub-core/fs/xfs.c
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+++ b/grub-core/fs/xfs.c
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@@ -79,9 +79,18 @@ GRUB_MOD_LICENSE ("GPLv3+");
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#define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
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#define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
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-/* We do not currently verify metadata UUID so it is safe to read such filesystem */
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+/*
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+ * Directory entries with ftype are explicitly handled by GRUB code.
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+ *
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+ * We do not currently read the inode btrees, so it is safe to read filesystems
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+ * with the XFS_SB_FEAT_INCOMPAT_SPINODES feature.
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+ *
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+ * We do not currently verify metadata UUID, so it is safe to read filesystems
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+ * with the XFS_SB_FEAT_INCOMPAT_META_UUID feature.
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+ */
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#define XFS_SB_FEAT_INCOMPAT_SUPPORTED \
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(XFS_SB_FEAT_INCOMPAT_FTYPE | \
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+ XFS_SB_FEAT_INCOMPAT_SPINODES | \
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XFS_SB_FEAT_INCOMPAT_META_UUID)
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struct grub_xfs_sblock
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--
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cgit v1.0-41-gc330
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