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nfs: centralize pgio error cleanup 

In case we fail during setting things up for read/write IO, set
pg_error in IO descriptor and do the cleanup in nfs_pageio_add_request,
where we clean up all pages that are still hanging around on the IO
descriptor.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Peng Tao 2015-12-05 02:03:17 +08:00 committed by Trond Myklebust
parent c18b96a1b8
commit 2bff228857
2 changed files with 33 additions and 32 deletions
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53
fs/nfs/pagelist.c
View File

@ -664,22 +664,11 @@ EXPORT_SYMBOL_GPL(nfs_initiate_pgio);
* @desc: IO descriptor
* @hdr: pageio header
*/
static int nfs_pgio_error(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
static void nfs_pgio_error(struct nfs_pgio_header *hdr)
{
struct nfs_pgio_mirror *mirror;
u32 midx;
set_bit(NFS_IOHDR_REDO, &hdr->flags);
nfs_pgio_data_destroy(hdr);
hdr->completion_ops->completion(hdr);
/* TODO: Make sure it's right to clean up all mirrors here
* and not just hdr->pgio_mirror_idx */
for (midx = 0; midx < desc->pg_mirror_count; midx++) {
mirror = &desc->pg_mirrors[midx];
desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
}
return -ENOMEM;
}
/**
@ -800,8 +789,11 @@ int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
unsigned int pagecount, pageused;
pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count);
if (!nfs_pgarray_set(&hdr->page_array, pagecount))
return nfs_pgio_error(desc, hdr);
if (!nfs_pgarray_set(&hdr->page_array, pagecount)) {
nfs_pgio_error(hdr);
desc->pg_error = -ENOMEM;
return desc->pg_error;
}
nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
pages = hdr->page_array.pagevec;
@ -819,8 +811,11 @@ int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
*pages++ = last_page = req->wb_page;
}
}
if (WARN_ON_ONCE(pageused != pagecount))
return nfs_pgio_error(desc, hdr);
if (WARN_ON_ONCE(pageused != pagecount)) {
nfs_pgio_error(hdr);
desc->pg_error = -EINVAL;
return desc->pg_error;
}
if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
(desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
@ -843,10 +838,8 @@ static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
if (!hdr) {
/* TODO: make sure this is right with mirroring - or
* should it back out all mirrors? */
desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
return -ENOMEM;
desc->pg_error = -ENOMEM;
return desc->pg_error;
}
nfs_pgheader_init(desc, hdr, nfs_pgio_header_free);
ret = nfs_generic_pgio(desc, hdr);
@ -1126,7 +1119,6 @@ static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
static int nfs_pageio_add_request_mirror(struct nfs_pageio_descriptor *desc,
struct nfs_page *req)
{
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
int ret;
do {
@ -1193,10 +1185,23 @@ int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
out_failed:
/*
* We might have failed before sending any reqs over wire.
* clean up rest of the reqs in mirror pg_list
* Clean up rest of the reqs in mirror pg_list.
*/
if (desc->pg_error)
desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
if (desc->pg_error) {
struct nfs_pgio_mirror *mirror;
void (*func)(struct list_head *);
/* remember fatal errors */
if (nfs_error_is_fatal(desc->pg_error))
mapping_set_error(desc->pg_inode->i_mapping,
desc->pg_error);
func = desc->pg_completion_ops->error_cleanup;
for (midx = 0; midx < desc->pg_mirror_count; midx++) {
mirror = &desc->pg_mirrors[midx];
func(&mirror->pg_list);
}
}
return 0;
}

12
fs/nfs/pnfs.c
View File

@ -2026,15 +2026,13 @@ static void pnfs_writehdr_free(struct nfs_pgio_header *hdr)
int
pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
{
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
struct nfs_pgio_header *hdr;
int ret;
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
if (!hdr) {
desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
return -ENOMEM;
desc->pg_error = -ENOMEM;
return desc->pg_error;
}
nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
@ -2157,15 +2155,13 @@ static void pnfs_readhdr_free(struct nfs_pgio_header *hdr)
int
pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
{
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
struct nfs_pgio_header *hdr;
int ret;
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
if (!hdr) {
desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
return -ENOMEM;
desc->pg_error = -ENOMEM;
return desc->pg_error;
}
nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
hdr->lseg = pnfs_get_lseg(desc->pg_lseg);