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NFSv4.1: Free the pnfs_layout_hdr outside the inode->i_lock 

None of the existing pNFS layout drivers seem to require the inode
to be locked while they free the layout header.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-09-20 17:23:11 -04:00
parent 01d39ce82b
commit 6622c3ea05
1 changed files with 9 additions and 12 deletions
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21
fs/nfs/pnfs.c
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@ -213,7 +213,7 @@ pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo)
}
static void
destroy_layout_hdr(struct pnfs_layout_hdr *lo)
pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo)
{
struct nfs_inode *nfsi = NFS_I(lo->plh_inode);
dprintk("%s: freeing layout cache %p\n", __func__, lo);
@ -222,14 +222,6 @@ destroy_layout_hdr(struct pnfs_layout_hdr *lo)
/* Reset MDS Threshold I/O counters */
nfsi->write_io = 0;
nfsi->read_io = 0;
pnfs_free_layout_hdr(lo);
}
static void
pnfs_put_layout_hdr_locked(struct pnfs_layout_hdr *lo)
{
if (atomic_dec_and_test(&lo->plh_refcount))
destroy_layout_hdr(lo);
}
void
@ -238,8 +230,9 @@ pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
struct inode *inode = lo->plh_inode;
if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
destroy_layout_hdr(lo);
pnfs_detach_layout_hdr(lo);
spin_unlock(&inode->i_lock);
pnfs_free_layout_hdr(lo);
}
}
@ -792,8 +785,12 @@ void pnfs_roc_release(struct inode *ino)
spin_lock(&ino->i_lock);
lo = NFS_I(ino)->layout;
lo->plh_block_lgets--;
pnfs_put_layout_hdr_locked(lo);
spin_unlock(&ino->i_lock);
if (atomic_dec_and_test(&lo->plh_refcount)) {
pnfs_detach_layout_hdr(lo);
spin_unlock(&ino->i_lock);
pnfs_free_layout_hdr(lo);
} else
spin_unlock(&ino->i_lock);
}
void pnfs_roc_set_barrier(struct inode *ino, u32 barrier)