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authorTrond Myklebust <trondmy@gmail.com>2018-08-14 17:25:37 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2018-08-15 11:43:38 -0400
commitd0fbb1d8a194c0ec0180c1d073ad709e45503a43 (patch)
tree8c22f2a2e8d4d1a406801969eccdc7bbc97c7e01 /fs
parent62421cd943014a84b095cefb31d2261c51eb3d4b (diff)
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NFSv4: Fix locking in pnfs_generic_recover_commit_reqs
The use of the inode->i_lock was converted to a mutex, but we forgot to remove the old inode unlock/lock() pair that allowed the layout segment to be put inside the loop. Reported-by: Jia-Ju Bai <baijiaju1990@gmail.com> Fixes: e824f99adaaf1 ("NFSv4: Use a mutex to protect the per-inode commit...") Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/pnfs_nfs.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c
index 32ba2d471853..d5e4d3cd8c7f 100644
--- a/fs/nfs/pnfs_nfs.c
+++ b/fs/nfs/pnfs_nfs.c
@@ -61,7 +61,7 @@ EXPORT_SYMBOL_GPL(pnfs_generic_commit_release);
/* The generic layer is about to remove the req from the commit list.
* If this will make the bucket empty, it will need to put the lseg reference.
- * Note this must be called holding i_lock
+ * Note this must be called holding nfsi->commit_mutex
*/
void
pnfs_generic_clear_request_commit(struct nfs_page *req,
@@ -149,9 +149,7 @@ restart:
if (list_empty(&b->written)) {
freeme = b->wlseg;
b->wlseg = NULL;
- spin_unlock(&cinfo->inode->i_lock);
pnfs_put_lseg(freeme);
- spin_lock(&cinfo->inode->i_lock);
goto restart;
}
}
@@ -167,7 +165,7 @@ static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx)
LIST_HEAD(pages);
int i;
- spin_lock(&cinfo->inode->i_lock);
+ mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
for (i = idx; i < fl_cinfo->nbuckets; i++) {
bucket = &fl_cinfo->buckets[i];
if (list_empty(&bucket->committing))
@@ -177,12 +175,12 @@ static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx)
list_for_each(pos, &bucket->committing)
cinfo->ds->ncommitting--;
list_splice_init(&bucket->committing, &pages);
- spin_unlock(&cinfo->inode->i_lock);
+ mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
nfs_retry_commit(&pages, freeme, cinfo, i);
pnfs_put_lseg(freeme);
- spin_lock(&cinfo->inode->i_lock);
+ mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
}
- spin_unlock(&cinfo->inode->i_lock);
+ mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
}
static unsigned int
@@ -222,13 +220,13 @@ void pnfs_fetch_commit_bucket_list(struct list_head *pages,
struct list_head *pos;
bucket = &cinfo->ds->buckets[data->ds_commit_index];
- spin_lock(&cinfo->inode->i_lock);
+ mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
list_for_each(pos, &bucket->committing)
cinfo->ds->ncommitting--;
list_splice_init(&bucket->committing, pages);
data->lseg = bucket->clseg;
bucket->clseg = NULL;
- spin_unlock(&cinfo->inode->i_lock);
+ mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
}