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NFS: Fix another COMMIT race in pNFS

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We must make sure that cinfo->ds->ncommitting is in sync with the
commit list, since it is checked as part of pnfs_commit_list().

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2017-07-12 19:10:57 -04:00 committed by Anna Schumaker
parent e39928f942
commit 4118188645
1 changed files with 6 additions and 1 deletions
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7
fs/nfs/pnfs_nfs.c
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@ -187,6 +187,7 @@ static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx)
struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
struct pnfs_commit_bucket *bucket;
struct pnfs_layout_segment *freeme;
struct list_head *pos;
LIST_HEAD(pages);
int i;
@ -197,6 +198,8 @@ static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx)
continue;
freeme = bucket->clseg;
bucket->clseg = NULL;
list_for_each(pos, &bucket->committing)
cinfo->ds->ncommitting--;
list_splice_init(&bucket->committing, &pages);
spin_unlock(&cinfo->inode->i_lock);
nfs_retry_commit(&pages, freeme, cinfo, i);
@ -247,9 +250,12 @@ void pnfs_fetch_commit_bucket_list(struct list_head *pages,
struct nfs_commit_info *cinfo)
{
struct pnfs_commit_bucket *bucket;
struct list_head *pos;
bucket = &cinfo->ds->buckets[data->ds_commit_index];
spin_lock(&cinfo->inode->i_lock);
list_for_each(pos, &bucket->committing)
cinfo->ds->ncommitting--;
list_splice_init(&bucket->committing, pages);
data->lseg = bucket->clseg;
bucket->clseg = NULL;
@ -334,7 +340,6 @@ pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
}
}
out:
cinfo->ds->ncommitting = 0;
return PNFS_ATTEMPTED;
}
EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist);