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ceph: fix freeing inode vs removing session caps race

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remove_session_caps() uses iterate_session_caps() to remove caps,
but iterate_session_caps() skips inodes that are being deleted.
So session->s_nr_caps can be non-zero after iterate_session_caps()
return.

We can fix the issue by waiting until deletions are complete.
__wait_on_freeing_inode() is designed for the job, but it is not
exported, so we use lookup inode function to access it.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
This commit is contained in:
Yan, Zheng
2013-07-24 12:22:11 +08:00
committed by Sage Weil
parent 4d1829a59d
commit 6f60f88947
3 changed files with 41 additions and 0 deletions
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8
fs/ceph/inode.c
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@@ -61,6 +61,14 @@ struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
return inode;
}
struct inode *ceph_lookup_inode(struct super_block *sb, struct ceph_vino vino)
{
struct inode *inode;
ino_t t = ceph_vino_to_ino(vino);
inode = ilookup5_nowait(sb, t, ceph_ino_compare, &vino);
return inode;
}
/*
* get/constuct snapdir inode for a given directory
*/