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xfs: preserve i_rdev when recycling a reclaimable inode

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Commit 66f364649d ("xfs: remove if_rdev") moved storing of rdev
value for special inodes to VFS inodes, but forgot to preserve the
value of i_rdev when recycling a reclaimable xfs_inode.

This was detected by xfstest overlay/017 with inodex=on mount option
and xfs base fs. The test does a lookup of overlay chardev and blockdev
right after drop caches.

Overlayfs inodes hold a reference on underlying xfs inodes when mount
option index=on is configured. If drop caches reclaim xfs inodes, before
it relclaims overlayfs inodes, that can sometimes leave a reclaimable xfs
inode and that test hits that case quite often.

When that happens, the xfs inode cache remains broken (zere i_rdev)
until the next cycle mount or drop caches.

Fixes: 66f364649d ("xfs: remove if_rdev")
Signed-off-by: Amir Goldstein <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>
This commit is contained in:
Amir Goldstein 2018-01-26 11:24:40 -08:00 • committed by Darrick J. Wong
commit acd1d71598
1 changed files with 2 additions and 0 deletions
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2
fs/xfs/xfs_icache.c
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@ -295,6 +295,7 @@ xfs_reinit_inode(
uint32_t generation = inode->i_generation;
uint64_t version = inode->i_version;
umode_t mode = inode->i_mode;
dev_t dev = inode->i_rdev;
error = inode_init_always(mp->m_super, inode);
@ -302,6 +303,7 @@ xfs_reinit_inode(
inode->i_generation = generation;
inode->i_version = version;
inode->i_mode = mode;
inode->i_rdev = dev;
return error;
}