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authorWeston Andros Adamson <dros@primarydata.com>2016-04-01 17:42:28 +0200
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2016-05-09 15:05:40 +0200
commit1b1bc66bb4ebd737fb750b0e1afc753098f4a1b2 (patch)
tree4c2c2175fadbc45eb3c02ba89e55bec893768686
parentLinux 4.6-rc7 (diff)
downloadlinux-1b1bc66bb4ebd737fb750b0e1afc753098f4a1b2.tar.xz
linux-1b1bc66bb4ebd737fb750b0e1afc753098f4a1b2.zip
pnfs: set NFS_IOHDR_REDO in pnfs_read_resend_pnfs
Like other resend paths, mark the (old) hdr as NFS_IOHDR_REDO. This ensures the hdr completion function will not count the (old) hdr as good bytes. Also, vector the error back through the hdr->task.tk_status like other retry calls. This fixes a bug with the FlexFiles layout where libaio was reporting more bytes read than requested. Signed-off-by: Weston Andros Adamson <dros@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
-rw-r--r--fs/nfs/pnfs.c14
-rw-r--r--fs/nfs/pnfs.h2
2 files changed, 9 insertions, 7 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 89a5ef4df08a..5b404d926e08 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -2143,12 +2143,15 @@ pnfs_try_to_read_data(struct nfs_pgio_header *hdr,
}
/* Resend all requests through pnfs. */
-int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
+void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr)
{
struct nfs_pageio_descriptor pgio;
- nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops);
- return nfs_pageio_resend(&pgio, hdr);
+ if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
+ nfs_pageio_init_read(&pgio, hdr->inode, false,
+ hdr->completion_ops);
+ hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr);
+ }
}
EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs);
@@ -2158,12 +2161,11 @@ pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr)
const struct rpc_call_ops *call_ops = desc->pg_rpc_callops;
struct pnfs_layout_segment *lseg = desc->pg_lseg;
enum pnfs_try_status trypnfs;
- int err = 0;
trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg);
if (trypnfs == PNFS_TRY_AGAIN)
- err = pnfs_read_resend_pnfs(hdr);
- if (trypnfs == PNFS_NOT_ATTEMPTED || err)
+ pnfs_read_resend_pnfs(hdr);
+ if (trypnfs == PNFS_NOT_ATTEMPTED || hdr->task.tk_status)
pnfs_read_through_mds(desc, hdr);
}
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 1ac1db5f6dad..7222d3a35439 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -282,7 +282,7 @@ int _pnfs_return_layout(struct inode *);
int pnfs_commit_and_return_layout(struct inode *);
void pnfs_ld_write_done(struct nfs_pgio_header *);
void pnfs_ld_read_done(struct nfs_pgio_header *);
-int pnfs_read_resend_pnfs(struct nfs_pgio_header *);
+void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
struct nfs_open_context *ctx,
loff_t pos,