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bcachefs: Hook up RENAME_WHITEOUT in rename.

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This is needed for overlayfs, which is used by container managers.

Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Sasha Finkelstein 2024-08-18 19:09:02 +02:00 committed by Kent Overstreet
parent d90c8acd35
commit 4645855df0
4 changed files with 52 additions and 14 deletions
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6
fs/bcachefs/btree_iter.h
View File

@ -529,6 +529,12 @@ void bch2_set_btree_iter_dontneed(struct btree_iter *);
void *__bch2_trans_kmalloc(struct btree_trans *, size_t);
/**
* bch2_trans_kmalloc - allocate memory for use by the current transaction
*
* Must be called after bch2_trans_begin, which on second and further calls
* frees all memory allocated in this transaction
*/
static inline void *bch2_trans_kmalloc(struct btree_trans *trans, size_t size)
{
size = roundup(size, 8);

5
fs/bcachefs/fs-common.c
View File

@ -42,7 +42,8 @@ int bch2_create_trans(struct btree_trans *trans,
if (ret)
goto err;
ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir, BTREE_ITER_intent);
ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir,
BTREE_ITER_intent|BTREE_ITER_with_updates);
if (ret)
goto err;
@ -163,7 +164,7 @@ int bch2_create_trans(struct btree_trans *trans,
name,
dir_target,
&dir_offset,
STR_HASH_must_create);
STR_HASH_must_create|BTREE_ITER_with_updates);
if (ret)
goto err;

53
fs/bcachefs/fs.c
View File

@ -736,15 +736,16 @@ static int bch2_rename2(struct mnt_idmap *idmap,
struct bch_inode_info *src_inode = to_bch_ei(src_dentry->d_inode);
struct bch_inode_info *dst_inode = to_bch_ei(dst_dentry->d_inode);
struct bch_inode_unpacked dst_dir_u, src_dir_u;
struct bch_inode_unpacked src_inode_u, dst_inode_u;
struct bch_inode_unpacked src_inode_u, dst_inode_u, *whiteout_inode_u;
struct btree_trans *trans;
enum bch_rename_mode mode = flags & RENAME_EXCHANGE
? BCH_RENAME_EXCHANGE
: dst_dentry->d_inode
? BCH_RENAME_OVERWRITE : BCH_RENAME;
bool whiteout = !!(flags & RENAME_WHITEOUT);
int ret;
if (flags & ~(RENAME_NOREPLACE|RENAME_EXCHANGE))
if (flags & ~(RENAME_NOREPLACE|RENAME_EXCHANGE|RENAME_WHITEOUT))
return -EINVAL;
if (mode == BCH_RENAME_OVERWRITE) {
@ -785,18 +786,48 @@ static int bch2_rename2(struct mnt_idmap *idmap,
if (ret)
goto err;
}
retry:
bch2_trans_begin(trans);
ret = commit_do(trans, NULL, NULL, 0,
bch2_rename_trans(trans,
inode_inum(src_dir), &src_dir_u,
inode_inum(dst_dir), &dst_dir_u,
&src_inode_u,
&dst_inode_u,
&src_dentry->d_name,
&dst_dentry->d_name,
mode));
ret = bch2_rename_trans(trans,
inode_inum(src_dir), &src_dir_u,
inode_inum(dst_dir), &dst_dir_u,
&src_inode_u,
&dst_inode_u,
&src_dentry->d_name,
&dst_dentry->d_name,
mode);
if (unlikely(ret))
goto err_tx_restart;
if (whiteout) {
whiteout_inode_u = bch2_trans_kmalloc_nomemzero(trans, sizeof(*whiteout_inode_u));
ret = PTR_ERR_OR_ZERO(whiteout_inode_u);
if (unlikely(ret))
goto err_tx_restart;
bch2_inode_init_early(c, whiteout_inode_u);
ret = bch2_create_trans(trans,
inode_inum(src_dir), &src_dir_u,
whiteout_inode_u,
&src_dentry->d_name,
from_kuid(i_user_ns(&src_dir->v), current_fsuid()),
from_kgid(i_user_ns(&src_dir->v), current_fsgid()),
S_IFCHR|WHITEOUT_MODE, 0,
NULL, NULL, (subvol_inum) { 0 }, 0) ?:
bch2_quota_acct(c, bch_qid(whiteout_inode_u), Q_INO, 1,
KEY_TYPE_QUOTA_PREALLOC);
if (unlikely(ret))
goto err_tx_restart;
}
ret = bch2_trans_commit(trans, NULL, NULL, 0);
if (unlikely(ret)) {
err_tx_restart:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
goto err;
}
BUG_ON(src_inode->v.i_ino != src_inode_u.bi_inum);
BUG_ON(dst_inode &&

2
fs/bcachefs/str_hash.h
View File

@ -270,7 +270,7 @@ int bch2_hash_set_in_snapshot(struct btree_trans *trans,
desc.hash_bkey(info, bkey_i_to_s_c(insert)),
snapshot),
POS(insert->k.p.inode, U64_MAX),
BTREE_ITER_slots|BTREE_ITER_intent, k, ret) {
BTREE_ITER_slots|BTREE_ITER_intent|flags, k, ret) {
if (is_visible_key(desc, inum, k)) {
if (!desc.cmp_bkey(k, bkey_i_to_s_c(insert)))
goto found;