diff options
Diffstat (limited to 'fs/nfs/super.c')
| -rw-r--r-- | fs/nfs/super.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index aeb715b4a690..91b5503b6f74 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -454,8 +454,12 @@ static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, { NFS_MOUNT_NONLM, ",nolock", "" }, { NFS_MOUNT_NOACL, ",noacl", "" }, { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, + { NFS_MOUNT_FORCE_RDIRPLUS, ",rdirplus=force", "" }, { NFS_MOUNT_UNSHARED, ",nosharecache", "" }, { NFS_MOUNT_NORESVPORT, ",noresvport", "" }, + { NFS_MOUNT_NETUNREACH_FATAL, + ",fatal_neterrors=ENETDOWN:ENETUNREACH", + ",fatal_neterrors=none" }, { 0, NULL, NULL } }; const struct proc_nfs_info *nfs_infop; @@ -1048,6 +1052,16 @@ int nfs_reconfigure(struct fs_context *fc) sync_filesystem(sb); /* + * The SB_RDONLY flag has been removed from the superblock during + * mounts to prevent interference between different filesystems. + * Similarly, it is also necessary to ignore the SB_RDONLY flag + * during reconfiguration; otherwise, it may also result in the + * creation of redundant superblocks when mounting a directory with + * different rw and ro flags multiple times. + */ + fc->sb_flags_mask &= ~SB_RDONLY; + + /* * Userspace mount programs that send binary options generally send * them populated with default values. We have no way to know which * ones were explicitly specified. Fall back to legacy behavior and @@ -1304,8 +1318,17 @@ int nfs_get_tree_common(struct fs_context *fc) if (IS_ERR(server)) return PTR_ERR(server); + /* + * When NFS_MOUNT_UNSHARED is not set, NFS forces the sharing of a + * superblock among each filesystem that mounts sub-directories + * belonging to a single exported root path. + * To prevent interference between different filesystems, the + * SB_RDONLY flag should be removed from the superblock. + */ if (server->flags & NFS_MOUNT_UNSHARED) compare_super = NULL; + else + fc->sb_flags &= ~SB_RDONLY; /* -o noac implies -o sync */ if (server->flags & NFS_MOUNT_NOAC) |