2015-09-01 08:17:17

by Trond Myklebust

Subject: [PATCH] NFSv4.1/flexfiles: Mark layout for return if the mirrors are invalid

If a read-write layout has an invalid mirror, then we should
mark it as invalid, and return it.
If a read-only layout has an invalid mirror, then mark it as invalid
and check if there is still at least one valid mirror before we return
it.

Signed-off-by: Trond Myklebust <[email protected]>
---
fs/nfs/flexfilelayout/flexfilelayoutdev.c | 45 ++++++++++++++++++++-----------
1 file changed, 30 insertions(+), 15 deletions(-)

diff --git a/fs/nfs/flexfilelayout/flexfilelayoutdev.c b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
index b28fa4cbea52..1da9f0c4445d 100644
--- a/fs/nfs/flexfilelayout/flexfilelayoutdev.c
+++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
@@ -172,6 +172,32 @@ out_err:
return NULL;
}

+static void ff_layout_mark_devid_invalid(struct pnfs_layout_segment *lseg,
+ struct nfs4_deviceid_node *devid)
+{
+ pnfs_generic_mark_devid_invalid(devid);
+ if (lseg->pls_range.iomode != IOMODE_READ ||
+ !ff_layout_has_available_ds(lseg))
+ pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
+}
+
+static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg,
+ struct nfs4_ff_layout_mirror *mirror)
+{
+ if (mirror == NULL || mirror->mirror_ds == NULL ||
+ mirror->mirror_ds->ds == NULL) {
+ if (mirror && mirror->mirror_ds) {
+ struct nfs4_deviceid_node *devid;
+ devid = &mirror->mirror_ds->id_node;
+ ff_layout_mark_devid_invalid(lseg, devid);
+ } else
+ pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode,
+ lseg);
+ return false;
+ }
+ return true;
+}
+
static u64
end_offset(u64 start, u64 len)
{
@@ -336,16 +362,10 @@ nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx)
{
struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx);
struct nfs_fh *fh = NULL;
- struct nfs4_deviceid_node *devid;

- if (mirror == NULL || mirror->mirror_ds == NULL ||
- mirror->mirror_ds->ds == NULL) {
- printk(KERN_ERR "NFS: %s: No data server for mirror offset index %d\n",
+ if (!ff_layout_mirror_valid(lseg, mirror)) {
+ pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n",
__func__, mirror_idx);
- if (mirror && mirror->mirror_ds) {
- devid = &mirror->mirror_ds->id_node;
- pnfs_generic_mark_devid_invalid(devid);
- }
goto out;
}

@@ -368,14 +388,9 @@ nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx,
unsigned int max_payload;
rpc_authflavor_t flavor;

- if (mirror == NULL || mirror->mirror_ds == NULL ||
- mirror->mirror_ds->ds == NULL) {
- printk(KERN_ERR "NFS: %s: No data server for offset index %d\n",
+ if (!ff_layout_mirror_valid(lseg, mirror)) {
+ pr_err_ratelimited("NFS: %s: No data server for offset index %d\n",
__func__, ds_idx);
- if (mirror && mirror->mirror_ds) {
- devid = &mirror->mirror_ds->id_node;
- pnfs_generic_mark_devid_invalid(devid);
- }
goto out;
}

--
2.4.3