aboutsummaryrefslogtreecommitdiffstats
path: root/fs/btrfs/inode.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/btrfs/inode.c')
-rw-r--r--fs/btrfs/inode.c95
1 files changed, 74 insertions, 21 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ba951764b005..b2d004ad66a0 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4009,12 +4009,20 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
struct btrfs_root *sub_root = root;
struct btrfs_key location;
int index;
- int ret;
+ int ret = 0;
if (dentry->d_name.len > BTRFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
- ret = btrfs_inode_by_name(dir, dentry, &location);
+ if (unlikely(d_need_lookup(dentry))) {
+ memcpy(&location, dentry->d_fsdata, sizeof(struct btrfs_key));
+ kfree(dentry->d_fsdata);
+ dentry->d_fsdata = NULL;
+ /* This thing is hashed, drop it for now */
+ d_drop(dentry);
+ } else {
+ ret = btrfs_inode_by_name(dir, dentry, &location);
+ }
if (ret < 0)
return ERR_PTR(ret);
@@ -4069,16 +4077,24 @@ static int btrfs_dentry_delete(const struct dentry *dentry)
return 0;
}
+static void btrfs_dentry_release(struct dentry *dentry)
+{
+ if (dentry->d_fsdata)
+ kfree(dentry->d_fsdata);
+}
+
static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
- struct inode *inode;
+ struct dentry *ret;
- inode = btrfs_lookup_dentry(dir, dentry);
- if (IS_ERR(inode))
- return ERR_CAST(inode);
-
- return d_splice_alias(inode, dentry);
+ ret = d_splice_alias(btrfs_lookup_dentry(dir, dentry), dentry);
+ if (unlikely(d_need_lookup(dentry))) {
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags &= ~DCACHE_NEED_LOOKUP;
+ spin_unlock(&dentry->d_lock);
+ }
+ return ret;
}
unsigned char btrfs_filetype_table[] = {
@@ -4097,6 +4113,7 @@ static int btrfs_real_readdir(struct file *filp, void *dirent,
struct btrfs_path *path;
struct list_head ins_list;
struct list_head del_list;
+ struct qstr q;
int ret;
struct extent_buffer *leaf;
int slot;
@@ -4187,6 +4204,7 @@ static int btrfs_real_readdir(struct file *filp, void *dirent,
while (di_cur < di_total) {
struct btrfs_key location;
+ struct dentry *tmp;
if (verify_dir_item(root, leaf, di))
break;
@@ -4207,6 +4225,33 @@ static int btrfs_real_readdir(struct file *filp, void *dirent,
d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
btrfs_dir_item_key_to_cpu(leaf, di, &location);
+ q.name = name_ptr;
+ q.len = name_len;
+ q.hash = full_name_hash(q.name, q.len);
+ tmp = d_lookup(filp->f_dentry, &q);
+ if (!tmp) {
+ struct btrfs_key *newkey;
+
+ newkey = kzalloc(sizeof(struct btrfs_key),
+ GFP_NOFS);
+ if (!newkey)
+ goto no_dentry;
+ tmp = d_alloc(filp->f_dentry, &q);
+ if (!tmp) {
+ kfree(newkey);
+ dput(tmp);
+ goto no_dentry;
+ }
+ memcpy(newkey, &location,
+ sizeof(struct btrfs_key));
+ tmp->d_fsdata = newkey;
+ tmp->d_flags |= DCACHE_NEED_LOOKUP;
+ d_rehash(tmp);
+ dput(tmp);
+ } else {
+ dput(tmp);
+ }
+no_dentry:
/* is this a reference to our own snapshot? If so
* skip it
*/
@@ -4468,7 +4513,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
inode->i_generation = BTRFS_I(inode)->generation;
btrfs_set_inode_space_info(root, inode);
- if (mode & S_IFDIR)
+ if (S_ISDIR(mode))
owner = 0;
else
owner = 1;
@@ -4513,7 +4558,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
btrfs_inherit_iflags(inode, dir);
- if ((mode & S_IFREG)) {
+ if (S_ISREG(mode)) {
if (btrfs_test_opt(root, NODATASUM))
BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
if (btrfs_test_opt(root, NODATACOW) ||
@@ -4767,11 +4812,10 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
if (err) {
drop_inode = 1;
} else {
- struct dentry *parent = dget_parent(dentry);
+ struct dentry *parent = dentry->d_parent;
err = btrfs_update_inode(trans, root, inode);
BUG_ON(err);
btrfs_log_new_name(trans, inode, NULL, parent);
- dput(parent);
}
nr = trans->blocks_used;
@@ -6883,7 +6927,7 @@ static int btrfs_getattr(struct vfsmount *mnt,
{
struct inode *inode = dentry->d_inode;
generic_fillattr(inode, stat);
- stat->dev = BTRFS_I(inode)->root->anon_super.s_dev;
+ stat->dev = BTRFS_I(inode)->root->anon_dev;
stat->blksize = PAGE_CACHE_SIZE;
stat->blocks = (inode_get_bytes(inode) +
BTRFS_I(inode)->delalloc_bytes) >> 9;
@@ -7051,9 +7095,8 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
BUG_ON(ret);
if (old_ino != BTRFS_FIRST_FREE_OBJECTID) {
- struct dentry *parent = dget_parent(new_dentry);
+ struct dentry *parent = new_dentry->d_parent;
btrfs_log_new_name(trans, old_inode, old_dir, parent);
- dput(parent);
btrfs_end_log_trans(root);
}
out_fail:
@@ -7318,15 +7361,19 @@ static int btrfs_set_page_dirty(struct page *page)
return __set_page_dirty_nobuffers(page);
}
-static int btrfs_permission(struct inode *inode, int mask, unsigned int flags)
+static int btrfs_permission(struct inode *inode, int mask)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
+ umode_t mode = inode->i_mode;
- if (btrfs_root_readonly(root) && (mask & MAY_WRITE))
- return -EROFS;
- if ((BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) && (mask & MAY_WRITE))
- return -EACCES;
- return generic_permission(inode, mask, flags, btrfs_check_acl);
+ if (mask & MAY_WRITE &&
+ (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) {
+ if (btrfs_root_readonly(root))
+ return -EROFS;
+ if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY)
+ return -EACCES;
+ }
+ return generic_permission(inode, mask);
}
static const struct inode_operations btrfs_dir_inode_operations = {
@@ -7346,10 +7393,12 @@ static const struct inode_operations btrfs_dir_inode_operations = {
.listxattr = btrfs_listxattr,
.removexattr = btrfs_removexattr,
.permission = btrfs_permission,
+ .get_acl = btrfs_get_acl,
};
static const struct inode_operations btrfs_dir_ro_inode_operations = {
.lookup = btrfs_lookup,
.permission = btrfs_permission,
+ .get_acl = btrfs_get_acl,
};
static const struct file_operations btrfs_dir_file_operations = {
@@ -7418,6 +7467,7 @@ static const struct inode_operations btrfs_file_inode_operations = {
.removexattr = btrfs_removexattr,
.permission = btrfs_permission,
.fiemap = btrfs_fiemap,
+ .get_acl = btrfs_get_acl,
};
static const struct inode_operations btrfs_special_inode_operations = {
.getattr = btrfs_getattr,
@@ -7427,6 +7477,7 @@ static const struct inode_operations btrfs_special_inode_operations = {
.getxattr = btrfs_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = btrfs_removexattr,
+ .get_acl = btrfs_get_acl,
};
static const struct inode_operations btrfs_symlink_inode_operations = {
.readlink = generic_readlink,
@@ -7438,8 +7489,10 @@ static const struct inode_operations btrfs_symlink_inode_operations = {
.getxattr = btrfs_getxattr,
.listxattr = btrfs_listxattr,
.removexattr = btrfs_removexattr,
+ .get_acl = btrfs_get_acl,
};
const struct dentry_operations btrfs_dentry_operations = {
.d_delete = btrfs_dentry_delete,
+ .d_release = btrfs_dentry_release,
};
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.