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-rw-r--r--fs/exportfs/expfs.c128
1 files changed, 72 insertions, 56 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index db86006956b0..1e6f556514d6 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -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,
@@ -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;
@@ -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 */
@@ -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.
@@ -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)) {
@@ -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);
@@ -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));
@@ -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 */
@@ -392,11 +408,6 @@ out:
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
@@ -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);
@@ -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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