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| author | Al Viro <viro@zeniv.linux.org.uk> | 2011-03-16 06:59:40 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-03-16 16:48:06 -0400 |
| commit | c7f404b40a3665d9f4e9a927cc5c1ee0479ed8f9 (patch) | |
| tree | 2d6fa2bef00efa759f36b17f3be0d4fab3ac9bb5 /fs/nfs/super.c | |
| parent | f8ad9c4bae99854c961ca79ed130a0d11d9ab53c (diff) | |
| download | lwn-c7f404b40a3665d9f4e9a927cc5c1ee0479ed8f9.tar.gz lwn-c7f404b40a3665d9f4e9a927cc5c1ee0479ed8f9.zip | |
vfs: new superblock methods to override /proc/*/mount{s,info}
a) ->show_devname(m, mnt) - what to put into devname columns in mounts,
mountinfo and mountstats
b) ->show_path(m, mnt) - what to put into relative path column in mountinfo
Leaving those NULL gives old behaviour. NFS switched to using those.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/nfs/super.c')
| -rw-r--r-- | fs/nfs/super.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index a6ab483c9ad0..79bc61fe2868 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -263,6 +263,8 @@ static match_table_t nfs_local_lock_tokens = { static void nfs_umount_begin(struct super_block *); static int nfs_statfs(struct dentry *, struct kstatfs *); static int nfs_show_options(struct seq_file *, struct vfsmount *); +static int nfs_show_devname(struct seq_file *, struct vfsmount *); +static int nfs_show_path(struct seq_file *, struct vfsmount *); static int nfs_show_stats(struct seq_file *, struct vfsmount *); static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *); static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type, @@ -296,6 +298,8 @@ static const struct super_operations nfs_sops = { .evict_inode = nfs_evict_inode, .umount_begin = nfs_umount_begin, .show_options = nfs_show_options, + .show_devname = nfs_show_devname, + .show_path = nfs_show_path, .show_stats = nfs_show_stats, .remount_fs = nfs_remount, }; @@ -366,6 +370,8 @@ static const struct super_operations nfs4_sops = { .evict_inode = nfs4_evict_inode, .umount_begin = nfs_umount_begin, .show_options = nfs_show_options, + .show_devname = nfs_show_devname, + .show_path = nfs_show_path, .show_stats = nfs_show_stats, .remount_fs = nfs_remount, }; @@ -726,6 +732,28 @@ static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt) return 0; } +static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt) +{ + char *page = (char *) __get_free_page(GFP_KERNEL); + char *devname, *dummy; + int err = 0; + if (!page) + return -ENOMEM; + devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE); + if (IS_ERR(devname)) + err = PTR_ERR(devname); + else + seq_escape(m, devname, " \t\n\\"); + free_page((unsigned long)page); + return err; +} + +static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt) +{ + seq_puts(m, "/"); + return 0; +} + /* * Present statistical information for this VFS mountpoint */ |