We want to cache the pnfs_layout_hdr after a layoutget or i/o
failure so that pnfs_update_layout() can find it and know when
it is time to retry.
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
---
fs/nfs/pnfs.c | 40 ++++++++++++++++++++++++++++++++--------
1 file changed, 32 insertions(+), 8 deletions(-)
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index a9c9291..23c5d18 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -247,10 +247,28 @@ pnfs_iomode_to_fail_bit(u32 iomode)
}
static void
-pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
+pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
{
lo->plh_retry_timestamp = jiffies;
- set_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags);
+ if (test_and_set_bit(fail_bit, &lo->plh_flags))
+ atomic_inc(&lo->plh_refcount);
+}
+
+static void
+pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit)
+{
+ if (test_and_clear_bit(fail_bit, &lo->plh_flags))
+ atomic_dec(&lo->plh_refcount);
+}
+
+static void
+pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode)
+{
+ struct inode *inode = lo->plh_inode;
+
+ spin_lock(&inode->i_lock);
+ pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode));
+ spin_unlock(&inode->i_lock);
dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__,
iomode == IOMODE_RW ? "RW" : "READ");
}
@@ -259,14 +277,15 @@ static bool
pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode)
{
unsigned long start, end;
- if (test_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags) == 0)
+ int fail_bit = pnfs_iomode_to_fail_bit(iomode);
+
+ if (test_bit(fail_bit, &lo->plh_flags) == 0)
return false;
end = jiffies;
start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT;
if (!time_in_range(lo->plh_retry_timestamp, start, end)) {
/* It is time to retry the failed layoutgets */
- clear_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags);
- clear_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags);
+ pnfs_layout_clear_fail_bit(lo, fail_bit);
return false;
}
return true;
@@ -493,9 +512,14 @@ pnfs_destroy_layout(struct nfs_inode *nfsi)
if (lo) {
lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */
pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL);
- }
- spin_unlock(&nfsi->vfs_inode.i_lock);
- pnfs_free_lseg_list(&tmp_list);
+ pnfs_get_layout_hdr(lo);
+ pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED);
+ pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
+ spin_unlock(&nfsi->vfs_inode.i_lock);
+ pnfs_free_lseg_list(&tmp_list);
+ pnfs_put_layout_hdr(lo);
+ } else
+ spin_unlock(&nfsi->vfs_inode.i_lock);
}
EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
--
1.7.11.4
--
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