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NFSv4: Fix locking in pnfs_generic_recover_commit_reqs 

commit d0fbb1d8a1 upstream.

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: e824f99ada ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Trond Myklebust 2018-08-14 17:25:37 -04:00 committed by Greg Kroah-Hartman
parent bf23ba3737
commit c5759d5a7e
1 changed files with 7 additions and 9 deletions
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16
fs/nfs/pnfs_nfs.c
View File

@ -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);
}