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nfs: check wait_on_bit_lock err in page_group_lock

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Return errors from wait_on_bit_lock from nfs_page_group_lock.

Add a bool argument @wait to nfs_page_group_lock. If true, loop over
wait_on_bit_lock until it returns cleanly. If false, return the error
from wait_on_bit_lock.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Weston Andros Adamson
2014-07-17 20:42:15 -04:00
committed by Trond Myklebust
parent ec25422c66
commit e7029206ff
3 changed files with 28 additions and 9 deletions
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29
fs/nfs/pagelist.c
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@@ -147,17 +147,25 @@ static int nfs_wait_bit_uninterruptible(void *word)
* @req - request in group that is to be locked
*
* this lock must be held if modifying the page group list
*
* returns result from wait_on_bit_lock: 0 on success, < 0 on error
*/
void
nfs_page_group_lock(struct nfs_page *req)
int
nfs_page_group_lock(struct nfs_page *req, bool wait)
{
struct nfs_page *head = req->wb_head;
int ret;
WARN_ON_ONCE(head != head->wb_head);
wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK,
do {
ret = wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK,
nfs_wait_bit_uninterruptible,
TASK_UNINTERRUPTIBLE);
} while (wait && ret != 0);
WARN_ON_ONCE(ret > 0);
return ret;
}
/*
@@ -218,7 +226,7 @@ bool nfs_page_group_sync_on_bit(struct nfs_page *req, unsigned int bit)
{
bool ret;
nfs_page_group_lock(req);
nfs_page_group_lock(req, true);
ret = nfs_page_group_sync_on_bit_locked(req, bit);
nfs_page_group_unlock(req);
@@ -858,8 +866,13 @@ static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
struct nfs_page *subreq;
unsigned int bytes_left = 0;
unsigned int offset, pgbase;
int ret;
nfs_page_group_lock(req);
ret = nfs_page_group_lock(req, false);
if (ret < 0) {
desc->pg_error = ret;
return 0;
}
subreq = req;
bytes_left = subreq->wb_bytes;
@@ -881,7 +894,11 @@ static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
if (desc->pg_recoalesce)
return 0;
/* retry add_request for this subreq */
nfs_page_group_lock(req);
ret = nfs_page_group_lock(req, false);
if (ret < 0) {
desc->pg_error = ret;
return 0;
}
continue;
}