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Diffstat (limited to 'fs/btrfs/export.c')
-rw-r--r--fs/btrfs/export.c132
1 files changed, 98 insertions, 34 deletions
diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
index 951ef09b82f..41422a3de8e 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -5,7 +5,6 @@
#include "btrfs_inode.h"
#include "print-tree.h"
#include "export.h"
-#include "compat.h"
#define BTRFS_FID_SIZE_NON_CONNECTABLE (offsetof(struct btrfs_fid, \
parent_objectid) / 4)
@@ -13,38 +12,35 @@
parent_root_objectid) / 4)
#define BTRFS_FID_SIZE_CONNECTABLE_ROOT (sizeof(struct btrfs_fid) / 4)
-static int btrfs_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
- int connectable)
+static int btrfs_encode_fh(struct inode *inode, u32 *fh, int *max_len,
+ struct inode *parent)
{
struct btrfs_fid *fid = (struct btrfs_fid *)fh;
- struct inode *inode = dentry->d_inode;
int len = *max_len;
int type;
- if ((len < BTRFS_FID_SIZE_NON_CONNECTABLE) ||
- (connectable && len < BTRFS_FID_SIZE_CONNECTABLE))
- return 255;
+ if (parent && (len < BTRFS_FID_SIZE_CONNECTABLE)) {
+ *max_len = BTRFS_FID_SIZE_CONNECTABLE;
+ return FILEID_INVALID;
+ } else if (len < BTRFS_FID_SIZE_NON_CONNECTABLE) {
+ *max_len = BTRFS_FID_SIZE_NON_CONNECTABLE;
+ return FILEID_INVALID;
+ }
len = BTRFS_FID_SIZE_NON_CONNECTABLE;
type = FILEID_BTRFS_WITHOUT_PARENT;
- fid->objectid = inode->i_ino;
+ fid->objectid = btrfs_ino(inode);
fid->root_objectid = BTRFS_I(inode)->root->objectid;
fid->gen = inode->i_generation;
- if (connectable && !S_ISDIR(inode->i_mode)) {
- struct inode *parent;
+ if (parent) {
u64 parent_root_id;
- spin_lock(&dentry->d_lock);
-
- parent = dentry->d_parent->d_inode;
fid->parent_objectid = BTRFS_I(parent)->location.objectid;
fid->parent_gen = parent->i_generation;
parent_root_id = BTRFS_I(parent)->root->objectid;
- spin_unlock(&dentry->d_lock);
-
if (parent_root_id != fid->root_objectid) {
fid->parent_root_objectid = parent_root_id;
len = BTRFS_FID_SIZE_CONNECTABLE_ROOT;
@@ -63,9 +59,8 @@ static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
u64 root_objectid, u32 generation,
int check_generation)
{
- struct btrfs_fs_info *fs_info = btrfs_sb(sb)->fs_info;
+ struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root;
- struct dentry *dentry;
struct inode *inode;
struct btrfs_key key;
int index;
@@ -86,11 +81,6 @@ static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
goto fail;
}
- if (btrfs_root_refs(&root->root_item) == 0) {
- err = -ENOENT;
- goto fail;
- }
-
key.objectid = objectid;
btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
key.offset = 0;
@@ -108,10 +98,7 @@ static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid,
return ERR_PTR(-ESTALE);
}
- dentry = d_obtain_alias(inode);
- if (!IS_ERR(dentry))
- dentry->d_op = &btrfs_dentry_operations;
- return dentry;
+ return d_obtain_alias(inode);
fail:
srcu_read_unlock(&fs_info->subvol_srcu, index);
return ERR_PTR(err);
@@ -166,7 +153,6 @@ static struct dentry *btrfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
static struct dentry *btrfs_get_parent(struct dentry *child)
{
struct inode *dir = child->d_inode;
- static struct dentry *dentry;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_path *path;
struct extent_buffer *leaf;
@@ -176,14 +162,16 @@ static struct dentry *btrfs_get_parent(struct dentry *child)
int ret;
path = btrfs_alloc_path();
+ if (!path)
+ return ERR_PTR(-ENOMEM);
- if (dir->i_ino == BTRFS_FIRST_FREE_OBJECTID) {
+ if (btrfs_ino(dir) == BTRFS_FIRST_FREE_OBJECTID) {
key.objectid = root->root_key.objectid;
key.type = BTRFS_ROOT_BACKREF_KEY;
key.offset = (u64)-1;
root = root->fs_info->tree_root;
} else {
- key.objectid = dir->i_ino;
+ key.objectid = btrfs_ino(dir);
key.type = BTRFS_INODE_REF_KEY;
key.offset = (u64)-1;
}
@@ -192,7 +180,7 @@ static struct dentry *btrfs_get_parent(struct dentry *child)
if (ret < 0)
goto fail;
- BUG_ON(ret == 0);
+ BUG_ON(ret == 0); /* Key with offset of -1 found */
if (path->slots[0] == 0) {
ret = -ENOENT;
goto fail;
@@ -223,18 +211,94 @@ static struct dentry *btrfs_get_parent(struct dentry *child)
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
- dentry = d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root, NULL));
- if (!IS_ERR(dentry))
- dentry->d_op = &btrfs_dentry_operations;
- return dentry;
+ return d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root, NULL));
fail:
btrfs_free_path(path);
return ERR_PTR(ret);
}
+static int btrfs_get_name(struct dentry *parent, char *name,
+ struct dentry *child)
+{
+ struct inode *inode = child->d_inode;
+ struct inode *dir = parent->d_inode;
+ struct btrfs_path *path;
+ struct btrfs_root *root = BTRFS_I(dir)->root;
+ struct btrfs_inode_ref *iref;
+ struct btrfs_root_ref *rref;
+ struct extent_buffer *leaf;
+ unsigned long name_ptr;
+ struct btrfs_key key;
+ int name_len;
+ int ret;
+ u64 ino;
+
+ if (!dir || !inode)
+ return -EINVAL;
+
+ if (!S_ISDIR(dir->i_mode))
+ return -EINVAL;
+
+ ino = btrfs_ino(inode);
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ path->leave_spinning = 1;
+
+ if (ino == BTRFS_FIRST_FREE_OBJECTID) {
+ key.objectid = BTRFS_I(inode)->root->root_key.objectid;
+ key.type = BTRFS_ROOT_BACKREF_KEY;
+ key.offset = (u64)-1;
+ root = root->fs_info->tree_root;
+ } else {
+ key.objectid = ino;
+ key.offset = btrfs_ino(dir);
+ key.type = BTRFS_INODE_REF_KEY;
+ }
+
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0) {
+ btrfs_free_path(path);
+ return ret;
+ } else if (ret > 0) {
+ if (ino == BTRFS_FIRST_FREE_OBJECTID) {
+ path->slots[0]--;
+ } else {
+ btrfs_free_path(path);
+ return -ENOENT;
+ }
+ }
+ leaf = path->nodes[0];
+
+ if (ino == BTRFS_FIRST_FREE_OBJECTID) {
+ rref = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_root_ref);
+ name_ptr = (unsigned long)(rref + 1);
+ name_len = btrfs_root_ref_name_len(leaf, rref);
+ } else {
+ iref = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_inode_ref);
+ name_ptr = (unsigned long)(iref + 1);
+ name_len = btrfs_inode_ref_name_len(leaf, iref);
+ }
+
+ read_extent_buffer(leaf, name, name_ptr, name_len);
+ btrfs_free_path(path);
+
+ /*
+ * have to add the null termination to make sure that reconnect_path
+ * gets the right len for strlen
+ */
+ name[name_len] = '\0';
+
+ return 0;
+}
+
const struct export_operations btrfs_export_ops = {
.encode_fh = btrfs_encode_fh,
.fh_to_dentry = btrfs_fh_to_dentry,
.fh_to_parent = btrfs_fh_to_parent,
.get_parent = btrfs_get_parent,
+ .get_name = btrfs_get_name,
};
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 12:55:44 +0000