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NFS: Fix up commit deadlocks 

If O_DIRECT bumps the commit_info rpcs_out field, then that could lead
to fsync() hangs. The fix is to ensure that O_DIRECT calls
nfs_commit_end().

Fixes: 723c921e7d ("sched/wait, fs/nfs: Convert wait_on_atomic_t() usage to the new wait_var_event() API")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2021-10-04 15:37:42 -04:00
parent 64a93dbf25
commit 133a48abf6
4 changed files with 8 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/nfs/direct.c
View File

@ -620,7 +620,7 @@ static void nfs_direct_commit_complete(struct nfs_commit_data *data)
nfs_unlock_and_release_request(req);
}
if (atomic_dec_and_test(&cinfo.mds->rpcs_out))
if (nfs_commit_end(cinfo.mds))
nfs_direct_write_complete(dreq);
}

2
fs/nfs/pnfs_nfs.c
View File

@ -468,7 +468,6 @@ pnfs_bucket_alloc_ds_commits(struct list_head *list,
goto out_error;
data->ds_commit_index = i;
list_add_tail(&data->list, list);
atomic_inc(&cinfo->mds->rpcs_out);
nreq++;
}
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
@ -520,7 +519,6 @@ pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
data->ds_commit_index = -1;
list_splice_init(mds_pages, &data->pages);
list_add_tail(&data->list, &list);
atomic_inc(&cinfo->mds->rpcs_out);
nreq++;
}

9
fs/nfs/write.c
View File

@ -1673,10 +1673,13 @@ static void nfs_commit_begin(struct nfs_mds_commit_info *cinfo)
atomic_inc(&cinfo->rpcs_out);
}
static void nfs_commit_end(struct nfs_mds_commit_info *cinfo)
bool nfs_commit_end(struct nfs_mds_commit_info *cinfo)
{
if (atomic_dec_and_test(&cinfo->rpcs_out))
if (atomic_dec_and_test(&cinfo->rpcs_out)) {
wake_up_var(&cinfo->rpcs_out);
return true;
}
return false;
}
void nfs_commitdata_release(struct nfs_commit_data *data)
@ -1776,6 +1779,7 @@ void nfs_init_commit(struct nfs_commit_data *data,
data->res.fattr = &data->fattr;
data->res.verf = &data->verf;
nfs_fattr_init(&data->fattr);
nfs_commit_begin(cinfo->mds);
}
EXPORT_SYMBOL_GPL(nfs_init_commit);
@ -1822,7 +1826,6 @@ nfs_commit_list(struct inode *inode, struct list_head *head, int how,
/* Set up the argument struct */
nfs_init_commit(data, head, NULL, cinfo);
atomic_inc(&cinfo->mds->rpcs_out);
if (NFS_SERVER(inode)->nfs_client->cl_minorversion)
task_flags = RPC_TASK_MOVEABLE;
return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode),

1
include/linux/nfs_fs.h
View File

@ -568,6 +568,7 @@ extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
extern int nfs_commit_inode(struct inode *, int);
extern struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail);
extern void nfs_commit_free(struct nfs_commit_data *data);
bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);
static inline int
nfs_have_writebacks(struct inode *inode)