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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/fs/btrfs/export.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/fs/btrfs/export.c')
-rw-r--r--ANDROID_3.4.5/fs/btrfs/export.c317
1 files changed, 0 insertions, 317 deletions
diff --git a/ANDROID_3.4.5/fs/btrfs/export.c b/ANDROID_3.4.5/fs/btrfs/export.c
deleted file mode 100644
index e887ee62..00000000
--- a/ANDROID_3.4.5/fs/btrfs/export.c
+++ /dev/null
@@ -1,317 +0,0 @@
-#include <linux/fs.h>
-#include <linux/types.h>
-#include "ctree.h"
-#include "disk-io.h"
-#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)
-#define BTRFS_FID_SIZE_CONNECTABLE (offsetof(struct btrfs_fid, \
- 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)
-{
- struct btrfs_fid *fid = (struct btrfs_fid *)fh;
- struct inode *inode = dentry->d_inode;
- int len = *max_len;
- int type;
-
- if (connectable && (len < BTRFS_FID_SIZE_CONNECTABLE)) {
- *max_len = BTRFS_FID_SIZE_CONNECTABLE;
- return 255;
- } else if (len < BTRFS_FID_SIZE_NON_CONNECTABLE) {
- *max_len = BTRFS_FID_SIZE_NON_CONNECTABLE;
- return 255;
- }
-
- len = BTRFS_FID_SIZE_NON_CONNECTABLE;
- type = FILEID_BTRFS_WITHOUT_PARENT;
-
- 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;
- 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;
- type = FILEID_BTRFS_WITH_PARENT_ROOT;
- } else {
- len = BTRFS_FID_SIZE_CONNECTABLE;
- type = FILEID_BTRFS_WITH_PARENT;
- }
- }
-
- *max_len = len;
- return type;
-}
-
-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);
- struct btrfs_root *root;
- struct inode *inode;
- struct btrfs_key key;
- int index;
- int err = 0;
-
- if (objectid < BTRFS_FIRST_FREE_OBJECTID)
- return ERR_PTR(-ESTALE);
-
- key.objectid = root_objectid;
- btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
- key.offset = (u64)-1;
-
- index = srcu_read_lock(&fs_info->subvol_srcu);
-
- root = btrfs_read_fs_root_no_name(fs_info, &key);
- if (IS_ERR(root)) {
- err = PTR_ERR(root);
- 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;
-
- inode = btrfs_iget(sb, &key, root, NULL);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto fail;
- }
-
- srcu_read_unlock(&fs_info->subvol_srcu, index);
-
- if (check_generation && generation != inode->i_generation) {
- iput(inode);
- return ERR_PTR(-ESTALE);
- }
-
- return d_obtain_alias(inode);
-fail:
- srcu_read_unlock(&fs_info->subvol_srcu, index);
- return ERR_PTR(err);
-}
-
-static struct dentry *btrfs_fh_to_parent(struct super_block *sb, struct fid *fh,
- int fh_len, int fh_type)
-{
- struct btrfs_fid *fid = (struct btrfs_fid *) fh;
- u64 objectid, root_objectid;
- u32 generation;
-
- if (fh_type == FILEID_BTRFS_WITH_PARENT) {
- if (fh_len != BTRFS_FID_SIZE_CONNECTABLE)
- return NULL;
- root_objectid = fid->root_objectid;
- } else if (fh_type == FILEID_BTRFS_WITH_PARENT_ROOT) {
- if (fh_len != BTRFS_FID_SIZE_CONNECTABLE_ROOT)
- return NULL;
- root_objectid = fid->parent_root_objectid;
- } else
- return NULL;
-
- objectid = fid->parent_objectid;
- generation = fid->parent_gen;
-
- return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
-}
-
-static struct dentry *btrfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
- int fh_len, int fh_type)
-{
- struct btrfs_fid *fid = (struct btrfs_fid *) fh;
- u64 objectid, root_objectid;
- u32 generation;
-
- if ((fh_type != FILEID_BTRFS_WITH_PARENT ||
- fh_len != BTRFS_FID_SIZE_CONNECTABLE) &&
- (fh_type != FILEID_BTRFS_WITH_PARENT_ROOT ||
- fh_len != BTRFS_FID_SIZE_CONNECTABLE_ROOT) &&
- (fh_type != FILEID_BTRFS_WITHOUT_PARENT ||
- fh_len != BTRFS_FID_SIZE_NON_CONNECTABLE))
- return NULL;
-
- objectid = fid->objectid;
- root_objectid = fid->root_objectid;
- generation = fid->gen;
-
- return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
-}
-
-static struct dentry *btrfs_get_parent(struct dentry *child)
-{
- struct inode *dir = child->d_inode;
- struct btrfs_root *root = BTRFS_I(dir)->root;
- struct btrfs_path *path;
- struct extent_buffer *leaf;
- struct btrfs_root_ref *ref;
- struct btrfs_key key;
- struct btrfs_key found_key;
- int ret;
-
- path = btrfs_alloc_path();
- if (!path)
- return ERR_PTR(-ENOMEM);
-
- 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 = btrfs_ino(dir);
- key.type = BTRFS_INODE_REF_KEY;
- key.offset = (u64)-1;
- }
-
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
- if (ret < 0)
- goto fail;
-
- BUG_ON(ret == 0); /* Key with offset of -1 found */
- if (path->slots[0] == 0) {
- ret = -ENOENT;
- goto fail;
- }
-
- path->slots[0]--;
- leaf = path->nodes[0];
-
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
- if (found_key.objectid != key.objectid || found_key.type != key.type) {
- ret = -ENOENT;
- goto fail;
- }
-
- if (found_key.type == BTRFS_ROOT_BACKREF_KEY) {
- ref = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_root_ref);
- key.objectid = btrfs_root_ref_dirid(leaf, ref);
- } else {
- key.objectid = found_key.offset;
- }
- btrfs_free_path(path);
-
- if (found_key.type == BTRFS_ROOT_BACKREF_KEY) {
- return btrfs_get_dentry(root->fs_info->sb, key.objectid,
- found_key.offset, 0, 0);
- }
-
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
- 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,
-};