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btrfs: switch to discard_new_inode() 

Make sure that no partially set up inodes can be returned by
open-by-handle.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-05-16 12:20:05 -04:00
parent c2b6d621c4
commit 32955c5422
1 changed files with 39 additions and 67 deletions
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102
fs/btrfs/inode.c
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@ -6335,8 +6335,10 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
location->type = BTRFS_INODE_ITEM_KEY;
ret = btrfs_insert_inode_locked(inode);
if (ret < 0)
if (ret < 0) {
iput(inode);
goto fail;
}
path->leave_spinning = 1;
ret = btrfs_insert_empty_items(trans, root, path, key, sizes, nitems);
@ -6395,12 +6397,11 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
return inode;
fail_unlock:
unlock_new_inode(inode);
discard_new_inode(inode);
fail:
if (dir && name)
BTRFS_I(dir)->index_cnt--;
btrfs_free_path(path);
iput(inode);
return ERR_PTR(ret);
}
@ -6505,7 +6506,6 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
struct btrfs_root *root = BTRFS_I(dir)->root;
struct inode *inode = NULL;
int err;
int drop_inode = 0;
u64 objectid;
u64 index = 0;
@ -6527,6 +6527,7 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
mode, &index);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
inode = NULL;
goto out_unlock;
}
@ -6541,31 +6542,24 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
if (err)
goto out_unlock_inode;
goto out_unlock;
err = btrfs_add_nondir(trans, BTRFS_I(dir), dentry, BTRFS_I(inode),
0, index);
if (err) {
goto out_unlock_inode;
} else {
if (err)
goto out_unlock;
btrfs_update_inode(trans, root, inode);
d_instantiate_new(dentry, inode);
}
out_unlock:
btrfs_end_transaction(trans);
btrfs_btree_balance_dirty(fs_info);
if (drop_inode) {
if (err && inode) {
inode_dec_link_count(inode);
iput(inode);
discard_new_inode(inode);
}
return err;
out_unlock_inode:
drop_inode = 1;
unlock_new_inode(inode);
goto out_unlock;
}
static int btrfs_create(struct inode *dir, struct dentry *dentry,
@ -6575,7 +6569,6 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct inode *inode = NULL;
int drop_inode_on_err = 0;
int err;
u64 objectid;
u64 index = 0;
@ -6598,9 +6591,9 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
mode, &index);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
inode = NULL;
goto out_unlock;
}
drop_inode_on_err = 1;
/*
* If the active LSM wants to access the inode during
* d_instantiate it needs these. Smack checks to see
@ -6613,33 +6606,28 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
if (err)
goto out_unlock_inode;
goto out_unlock;
err = btrfs_update_inode(trans, root, inode);
if (err)
goto out_unlock_inode;
goto out_unlock;
err = btrfs_add_nondir(trans, BTRFS_I(dir), dentry, BTRFS_I(inode),
0, index);
if (err)
goto out_unlock_inode;
goto out_unlock;
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
d_instantiate_new(dentry, inode);
out_unlock:
btrfs_end_transaction(trans);
if (err && drop_inode_on_err) {
if (err && inode) {
inode_dec_link_count(inode);
iput(inode);
discard_new_inode(inode);
}
btrfs_btree_balance_dirty(fs_info);
return err;
out_unlock_inode:
unlock_new_inode(inode);
goto out_unlock;
}
static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
@ -6748,6 +6736,7 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
S_IFDIR | mode, &index);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
inode = NULL;
goto out_fail;
}
@ -6758,34 +6747,30 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
if (err)
goto out_fail_inode;
goto out_fail;
btrfs_i_size_write(BTRFS_I(inode), 0);
err = btrfs_update_inode(trans, root, inode);
if (err)
goto out_fail_inode;
goto out_fail;
err = btrfs_add_link(trans, BTRFS_I(dir), BTRFS_I(inode),
dentry->d_name.name,
dentry->d_name.len, 0, index);
if (err)
goto out_fail_inode;
goto out_fail;
d_instantiate_new(dentry, inode);
drop_on_err = 0;
out_fail:
btrfs_end_transaction(trans);
if (drop_on_err) {
if (err && inode) {
inode_dec_link_count(inode);
iput(inode);
discard_new_inode(inode);
}
btrfs_btree_balance_dirty(fs_info);
return err;
out_fail_inode:
unlock_new_inode(inode);
goto out_fail;
}
static noinline int uncompress_inline(struct btrfs_path *path,
@ -10112,7 +10097,6 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
struct btrfs_key key;
struct inode *inode = NULL;
int err;
int drop_inode = 0;
u64 objectid;
u64 index = 0;
int name_len;
@ -10145,6 +10129,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
objectid, S_IFLNK|S_IRWXUGO, &index);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
inode = NULL;
goto out_unlock;
}
@ -10161,12 +10146,12 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name);
if (err)
goto out_unlock_inode;
goto out_unlock;
path = btrfs_alloc_path();
if (!path) {
err = -ENOMEM;
goto out_unlock_inode;
goto out_unlock;
}
key.objectid = btrfs_ino(BTRFS_I(inode));
key.offset = 0;
@ -10176,7 +10161,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
datasize);
if (err) {
btrfs_free_path(path);
goto out_unlock_inode;
goto out_unlock;
}
leaf = path->nodes[0];
ei = btrfs_item_ptr(leaf, path->slots[0],
@ -10208,26 +10193,19 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
if (!err)
err = btrfs_add_nondir(trans, BTRFS_I(dir), dentry,
BTRFS_I(inode), 0, index);
if (err) {
drop_inode = 1;
goto out_unlock_inode;
}
if (err)
goto out_unlock;
d_instantiate_new(dentry, inode);
out_unlock:
btrfs_end_transaction(trans);
if (drop_inode) {
if (err && inode) {
inode_dec_link_count(inode);
iput(inode);
discard_new_inode(inode);
}
btrfs_btree_balance_dirty(fs_info);
return err;
out_unlock_inode:
drop_inode = 1;
unlock_new_inode(inode);
goto out_unlock;
}
static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
@ -10436,14 +10414,14 @@ static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
ret = btrfs_init_inode_security(trans, inode, dir, NULL);
if (ret)
goto out_inode;
goto out;
ret = btrfs_update_inode(trans, root, inode);
if (ret)
goto out_inode;
goto out;
ret = btrfs_orphan_add(trans, BTRFS_I(inode));
if (ret)
goto out_inode;
goto out;
/*
* We set number of links to 0 in btrfs_new_inode(), and here we set
@ -10453,21 +10431,15 @@ static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
* d_tmpfile() -> inode_dec_link_count() -> drop_nlink()
*/
set_nlink(inode, 1);
unlock_new_inode(inode);
d_tmpfile(dentry, inode);
unlock_new_inode(inode);
mark_inode_dirty(inode);
out:
btrfs_end_transaction(trans);
if (ret)
iput(inode);
if (ret && inode)
discard_new_inode(inode);
btrfs_btree_balance_dirty(fs_info);
return ret;
out_inode:
unlock_new_inode(inode);
goto out;
}
__attribute__((const))