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| author |   Trond Myklebust <trond.myklebust@hammerspace.com> | 2020-02-26 19:16:09 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2020-03-16 08:34:30 -0400 |
| commit | 3c9e502b59fbd243cfac7cc6c875e432d285102a (patch) | |
| tree | c1d4536d91db8a63bbc8cbc4447323db679900a3 /fs/nfs/super.c | |
| parent | NFSv4/pnfs: Clean up nfs_layout_find_inode() (diff) | |
| download | linux-dev-3c9e502b59fbd243cfac7cc6c875e432d285102a.tar.xz linux-dev-3c9e502b59fbd243cfac7cc6c875e432d285102a.zip | |
NFS: Add a helper nfs_client_for_each_server()
Add a helper nfs_client_for_each_server() to iterate through all the
filesystems that are attached to a struct nfs_client, and apply
a function to all the active ones.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/super.c')
| -rw-r--r-- | fs/nfs/super.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index dada09b391c6..eb3a85492396 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -176,6 +176,41 @@ void nfs_sb_deactive(struct super_block *sb) } EXPORT_SYMBOL_GPL(nfs_sb_deactive); +static int __nfs_list_for_each_server(struct list_head *head, + int (*fn)(struct nfs_server *, void *), + void *data) +{ + struct nfs_server *server, *last = NULL; + int ret = 0; + + rcu_read_lock(); + list_for_each_entry_rcu(server, head, client_link) { + if (!nfs_sb_active(server->super)) + continue; + rcu_read_unlock(); + if (last) + nfs_sb_deactive(last->super); + last = server; + ret = fn(server, data); + if (ret) + goto out; + rcu_read_lock(); + } + rcu_read_unlock(); +out: + if (last) + nfs_sb_deactive(last->super); + return ret; +} + +int nfs_client_for_each_server(struct nfs_client *clp, + int (*fn)(struct nfs_server *, void *), + void *data) +{ + return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data); +} +EXPORT_SYMBOL_GPL(nfs_client_for_each_server); + /* * Deliver file system statistics to userspace */ |