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NFSv4.1: Minor optimisation in get_layout_by_fh_locked()

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If the filehandles match, but the igrab() fails, or the layout is
freed before we can get it, then just return NULL.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2014-02-12 08:17:00 -05:00
parent 27999f2530
commit 9a7fe9e890
1 changed files with 2 additions and 2 deletions
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4
fs/nfs/callback_proc.c
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@ -127,13 +127,13 @@ static struct pnfs_layout_hdr * get_layout_by_fh_locked(struct nfs_client *clp,
continue; continue;
ino = igrab(lo->plh_inode); ino = igrab(lo->plh_inode);
if (!ino) if (!ino)
continue; break;
spin_lock(&ino->i_lock); spin_lock(&ino->i_lock);
/* Is this layout in the process of being freed? */ /* Is this layout in the process of being freed? */
if (NFS_I(ino)->layout != lo) { if (NFS_I(ino)->layout != lo) {
spin_unlock(&ino->i_lock); spin_unlock(&ino->i_lock);
iput(ino); iput(ino);
continue; break;
} }
pnfs_get_layout_hdr(lo); pnfs_get_layout_hdr(lo);
spin_unlock(&ino->i_lock); spin_unlock(&ino->i_lock);