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yaml
---
r: 60815
b: refs/heads/master
c: 10f11c3
h: refs/heads/master
i:
  60813: 835e909
  60811: f8e00da
  60807: 28191a4
  60799: e2988f4
v: v3
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Christoph Hellwig authored and Linus Torvalds committed Jul 17, 2007
1 parent 81e23ab commit ed37d14
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Showing 2 changed files with 73 additions and 57 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: d37065cd6d6bbe98fd4be14d6c9e64c0bfa124c5
refs/heads/master: 10f11c341da8c0ec6b8b024e892108a6537ba8c4
128 changes: 72 additions & 56 deletions trunk/fs/exportfs/expfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,11 +6,36 @@
#include <linux/mount.h>
#include <linux/namei.h>

struct export_operations export_op_default;
#define dprintk(fmt, args...) do{}while(0)

#define CALL(ops,fun) ((ops->fun)?(ops->fun):export_op_default.fun)

#define dprintk(fmt, args...) do{}while(0)
static int get_name(struct dentry *dentry, char *name,
struct dentry *child);


static struct dentry *exportfs_get_dentry(struct super_block *sb, void *obj)
{
struct dentry *result = ERR_PTR(-ESTALE);

if (sb->s_export_op->get_dentry) {
result = sb->s_export_op->get_dentry(sb, obj);
if (!result)
result = ERR_PTR(-ESTALE);
}

return result;
}

static int exportfs_get_name(struct dentry *dir, char *name,
struct dentry *child)
{
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);
}

static struct dentry *
find_acceptable_alias(struct dentry *result,
Expand Down Expand Up @@ -78,7 +103,7 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
{
struct dentry *result = NULL;
struct dentry *target_dir;
int err;
int err = -ESTALE;
struct export_operations *nops = sb->s_export_op;
struct dentry *alias;
int noprogress;
Expand All @@ -87,14 +112,10 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
/*
* Attempt to find the inode.
*/
result = CALL(sb->s_export_op,get_dentry)(sb,obj);
err = -ESTALE;
if (result == NULL)
goto err_out;
if (IS_ERR(result)) {
err = PTR_ERR(result);
goto err_out;
}
result = exportfs_get_dentry(sb, obj);
if (IS_ERR(result))
return result;

if (S_ISDIR(result->d_inode->i_mode) &&
(result->d_flags & DCACHE_DISCONNECTED)) {
/* it is an unconnected directory, we must connect it */
Expand Down Expand Up @@ -122,11 +143,11 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
if (parent == NULL)
goto err_result;

target_dir = CALL(sb->s_export_op,get_dentry)(sb,parent);
if (IS_ERR(target_dir))
target_dir = exportfs_get_dentry(sb,parent);
if (IS_ERR(target_dir)) {
err = PTR_ERR(target_dir);
if (target_dir == NULL || IS_ERR(target_dir))
goto err_result;
}
}
/*
* Now we need to make sure that target_dir is properly connected.
Expand Down Expand Up @@ -177,18 +198,27 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
spin_unlock(&pd->d_lock);
noprogress = 0;
} else {
/* we have hit the top of a disconnected path. Try
* to find parent and connect
* note: racing with some other process renaming a
* directory isn't much of a problem here. If someone
* renames the directory, it will end up properly
* connected, which is what we want
/*
* We have hit the top of a disconnected path, try to
* find parent and connect.
*
* Racing with some other process renaming a directory
* isn't much of a problem here. If someone renames
* the directory, it will end up properly connected,
* which is what we want
*
* Getting the parent can't be supported generically,
* the locking is too icky.
*
* Instead we just return EACCES. If server reboots
* or inodes get flushed, you lose
*/
struct dentry *ppd;
struct dentry *ppd = ERR_PTR(-EACCES);
struct dentry *npd;

mutex_lock(&pd->d_inode->i_mutex);
ppd = CALL(nops,get_parent)(pd);
if (nops->get_parent)
ppd = nops->get_parent(pd);
mutex_unlock(&pd->d_inode->i_mutex);

if (IS_ERR(ppd)) {
Expand All @@ -199,7 +229,7 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
break;
}
dprintk("find_exported_dentry: find name of %lu in %lu\n", pd->d_inode->i_ino, ppd->d_inode->i_ino);
err = CALL(nops,get_name)(ppd, nbuf, pd);
err = exportfs_get_name(ppd, nbuf, pd);
if (err) {
dput(ppd);
dput(pd);
Expand Down Expand Up @@ -250,7 +280,7 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
/* if we weren't after a directory, have one more step to go */
if (result != target_dir) {
struct dentry *nresult;
err = CALL(nops,get_name)(target_dir, nbuf, result);
err = exportfs_get_name(target_dir, nbuf, result);
if (!err) {
mutex_lock(&target_dir->d_inode->i_mutex);
nresult = lookup_one_len(nbuf, target_dir, strlen(nbuf));
Expand Down Expand Up @@ -286,23 +316,9 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
dput(target_dir);
err_result:
dput(result);
err_out:
return ERR_PTR(err);
}



static struct dentry *get_parent(struct dentry *child)
{
/* get_parent cannot be supported generically, the locking
* is too icky.
* instead, we just return EACCES. If server reboots or inodes
* get flushed, you lose
*/
return ERR_PTR(-EACCES);
}


struct getdents_callback {
char *name; /* name that was found. It already points to a
buffer NAME_MAX+1 is size */
Expand Down Expand Up @@ -392,11 +408,6 @@ static int get_name(struct dentry *dentry, char *name,
return error;
}

static struct dentry *get_dentry(struct super_block *sb, void *vobjp)
{
return ERR_PTR(-ESTALE);
}

/**
* export_encode_fh - default export_operations->encode_fh function
* @dentry: the dentry to encode
Expand Down Expand Up @@ -472,9 +483,15 @@ static struct dentry *export_decode_fh(struct super_block *sb, __u32 *fh, int fh
int exportfs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len,
int connectable)
{
struct export_operations *nop = dentry->d_sb->s_export_op;
struct export_operations *nop = dentry->d_sb->s_export_op;
int error;

return CALL(nop, encode_fh)(dentry, fh, max_len, connectable);
if (nop->encode_fh)
error = nop->encode_fh(dentry, fh, max_len, connectable);
else
error = export_encode_fh(dentry, fh, max_len, connectable);

return error;
}
EXPORT_SYMBOL_GPL(exportfs_encode_fh);

Expand All @@ -483,21 +500,20 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, __u32 *fh, int fh_len,
void *context)
{
struct export_operations *nop = mnt->mnt_sb->s_export_op;
struct dentry *result;

return CALL(nop, decode_fh)(mnt->mnt_sb, fh, fh_len, fileid_type,
if (nop->decode_fh) {
result = nop->decode_fh(mnt->mnt_sb, fh, fh_len, fileid_type,
acceptable, context);
} else {
result = export_decode_fh(mnt->mnt_sb, fh, fh_len, fileid_type,
acceptable, context);
}

return result;
}
EXPORT_SYMBOL_GPL(exportfs_decode_fh);

struct export_operations export_op_default = {
.decode_fh = export_decode_fh,
.encode_fh = export_encode_fh,

.get_name = get_name,
.get_parent = get_parent,
.get_dentry = get_dentry,
};

EXPORT_SYMBOL(find_exported_dentry);

MODULE_LICENSE("GPL");

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