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ceph: avoid repeatedly adding inode to mdsc->snap_flush_list

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Otherwise, mdsc->snap_flush_list may get corrupted.

Cc: [email protected]
Signed-off-by: "Yan, Zheng" <[email protected]>
Reviewed-by: Ilya Dryomov <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>
This commit is contained in:
Yan, Zheng 2019-02-11 15:18:52 +08:00 • committed by Ilya Dryomov
commit 04242ff3ac
1 changed files with 2 additions and 1 deletions
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3
fs/ceph/snap.c
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@ -616,7 +616,8 @@ int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
capsnap->size);
spin_lock(&mdsc->snap_flush_lock);
list_add_tail(&ci->i_snap_flush_item, &mdsc->snap_flush_list);
if (list_empty(&ci->i_snap_flush_item))
list_add_tail(&ci->i_snap_flush_item, &mdsc->snap_flush_list);
spin_unlock(&mdsc->snap_flush_lock);
return 1; /* caller may want to ceph_flush_snaps */
}