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nfs: fix regression in handling of fsc= option in NFSv4

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Setting the uniquifier for fscache via the fsc= mount
option is currently broken in NFSv4.

Fix this by passing fscache_uniq to root_fc if possible.

Signed-off-by: Chen Hanxiao <chenhx.fnst@fujitsu.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Chen Hanxiao 2024-01-31 17:49:17 +08:00 committed by Trond Myklebust
parent 47f7c95632
commit 1443f76b26
1 changed files with 24 additions and 0 deletions
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24
fs/nfs/nfs4super.c
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@ -145,6 +145,7 @@ static int do_nfs4_mount(struct nfs_server *server,
const char *export_path)
{
struct nfs_fs_context *root_ctx;
struct nfs_fs_context *ctx;
struct fs_context *root_fc;
struct vfsmount *root_mnt;
struct dentry *dentry;
@ -157,6 +158,12 @@ static int do_nfs4_mount(struct nfs_server *server,
.dirfd = -1,
};
struct fs_parameter param_fsc = {
.key = "fsc",
.type = fs_value_is_string,
.dirfd = -1,
};
if (IS_ERR(server))
return PTR_ERR(server);
@ -168,9 +175,26 @@ static int do_nfs4_mount(struct nfs_server *server,
kfree(root_fc->source);
root_fc->source = NULL;
ctx = nfs_fc2context(fc);
root_ctx = nfs_fc2context(root_fc);
root_ctx->internal = true;
root_ctx->server = server;
if (ctx->fscache_uniq) {
len = strlen(ctx->fscache_uniq);
param_fsc.size = len;
param_fsc.string = kmemdup_nul(ctx->fscache_uniq, len, GFP_KERNEL);
if (param_fsc.string == NULL) {
put_fs_context(root_fc);
return -ENOMEM;
}
ret = vfs_parse_fs_param(root_fc, &param_fsc);
kfree(param_fsc.string);
if (ret < 0) {
put_fs_context(root_fc);
return ret;
}
}
/* We leave export_path unset as it's not used to find the root. */
len = strlen(hostname) + 5;