lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

exportfs: update documentation

Browse Source 
Update documentation to the current state of affairs.  Remove duplicated
method descruptions in exportfs.h and point to Documentation/filesystems/
Exporting instead.  Add a little file header comment in expfs.c describing
what's going on and mentioning Neils and my copyright [1].

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Neil Brown <neilb@suse.de>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: <linux-ext4@vger.kernel.org>
Cc: Dave Kleikamp <shaggy@austin.ibm.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Cc: David Chinner <dgc@sgi.com>
Cc: Timothy Shimmin <tes@sgi.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Chris Mason <mason@suse.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig
2007-10-21 16:42:19 -07:00
committed by Linus Torvalds
parent 3965516440
commit e38f981758
3 changed files with 65 additions and 107 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
fs/exportfs/expfs.c
View File

@@ -1,4 +1,13 @@
/*
* Copyright (C) Neil Brown 2002
* Copyright (C) Christoph Hellwig 2007
*
* This file contains the code mapping from inodes to NFS file handles,
* and for mapping back from file handles to dentries.
*
* For details on why we do all the strange and hairy things in here
* take a look at Documentation/filesystems/Exporting.
*/
#include <linux/exportfs.h>
#include <linux/fs.h>
#include <linux/file.h>
@@ -9,19 +18,19 @@
#define dprintk(fmt, args...) do{}while(0)
static int get_name(struct dentry *dentry, char *name,
static int get_name(struct vfsmount *mnt, struct dentry *dentry, char *name,
struct dentry *child);
static int exportfs_get_name(struct dentry *dir, char *name,
struct dentry *child)
static int exportfs_get_name(struct vfsmount *mnt, struct dentry *dir,
char *name, struct dentry *child)
{
const struct export_operations *nop = dir->d_sb->s_export_op;
if (nop->get_name)
return nop->get_name(dir, name, child);
else
return get_name(dir, name, child);
return get_name(mnt, dir, name, child);
}
/*
@@ -85,7 +94,7 @@ find_disconnected_root(struct dentry *dentry)
* It may already be, as the flag isn't always updated when connection happens.
*/
static int
reconnect_path(struct super_block *sb, struct dentry *target_dir)
reconnect_path(struct vfsmount *mnt, struct dentry *target_dir)
{
char nbuf[NAME_MAX+1];
int noprogress = 0;
@@ -108,7 +117,7 @@ reconnect_path(struct super_block *sb, struct dentry *target_dir)
pd->d_flags &= ~DCACHE_DISCONNECTED;
spin_unlock(&pd->d_lock);
noprogress = 0;
} else if (pd == sb->s_root) {
} else if (pd == mnt->mnt_sb->s_root) {
printk(KERN_ERR "export: Eeek filesystem root is not connected, impossible\n");
spin_lock(&pd->d_lock);
pd->d_flags &= ~DCACHE_DISCONNECTED;
@@ -134,8 +143,8 @@ reconnect_path(struct super_block *sb, struct dentry *target_dir)
struct dentry *npd;
mutex_lock(&pd->d_inode->i_mutex);
if (sb->s_export_op->get_parent)
ppd = sb->s_export_op->get_parent(pd);
if (mnt->mnt_sb->s_export_op->get_parent)
ppd = mnt->mnt_sb->s_export_op->get_parent(pd);
mutex_unlock(&pd->d_inode->i_mutex);
if (IS_ERR(ppd)) {
@@ -148,7 +157,7 @@ reconnect_path(struct super_block *sb, struct dentry *target_dir)
dprintk("%s: find name of %lu in %lu\n", __FUNCTION__,
pd->d_inode->i_ino, ppd->d_inode->i_ino);
err = exportfs_get_name(ppd, nbuf, pd);
err = exportfs_get_name(mnt, ppd, nbuf, pd);
if (err) {
dput(ppd);
dput(pd);
@@ -238,8 +247,8 @@ static int filldir_one(void * __buf, const char * name, int len,
* calls readdir on the parent until it finds an entry with
* the same inode number as the child, and returns that.
*/
static int get_name(struct dentry *dentry, char *name,
struct dentry *child)
static int get_name(struct vfsmount *mnt, struct dentry *dentry,
char *name, struct dentry *child)
{
struct inode *dir = dentry->d_inode;
int error;
@@ -255,7 +264,7 @@ static int get_name(struct dentry *dentry, char *name,
/*
* Open the directory ...
*/
file = dentry_open(dget(dentry), NULL, O_RDONLY);
file = dentry_open(dget(dentry), mntget(mnt), O_RDONLY);
error = PTR_ERR(file);
if (IS_ERR(file))
goto out;
@@ -372,7 +381,7 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
* filesystem root.
*/
if (result->d_flags & DCACHE_DISCONNECTED) {
err = reconnect_path(mnt->mnt_sb, result);
err = reconnect_path(mnt, result);
if (err)
goto err_result;
}
@@ -424,7 +433,7 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
* connected to the filesystem root. The VFS really doesn't
* like disconnected directories..
*/
err = reconnect_path(mnt->mnt_sb, target_dir);
err = reconnect_path(mnt, target_dir);
if (err) {
dput(target_dir);
goto err_result;
@@ -435,7 +444,7 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid,
* dentry for the inode we're after, make sure that our
* inode is actually connected to the parent.
*/
err = exportfs_get_name(target_dir, nbuf, result);
err = exportfs_get_name(mnt, target_dir, nbuf, result);
if (!err) {
mutex_lock(&target_dir->d_inode->i_mutex);
nresult = lookup_one_len(nbuf, target_dir,