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linux-stable/fs/bcachefs/fs.c

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48 KiB
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// SPDX-License-Identifier: GPL-2.0
#ifndef NO_BCACHEFS_FS
#include "bcachefs.h"
#include "acl.h"
#include "bkey_buf.h"
#include "btree_update.h"
#include "buckets.h"
#include "chardev.h"
#include "dirent.h"
#include "errcode.h"
#include "extents.h"
#include "fs.h"
#include "fs-common.h"
#include "fs-io.h"
#include "fs-ioctl.h"
#include "fs-io-buffered.h"
#include "fs-io-direct.h"
#include "fs-io-pagecache.h"
#include "fsck.h"
#include "inode.h"
#include "io_read.h"
#include "journal.h"
#include "keylist.h"
#include "quota.h"
#include "snapshot.h"
#include "super.h"
#include "xattr.h"
#include <linux/aio.h>
#include <linux/backing-dev.h>
#include <linux/exportfs.h>
#include <linux/fiemap.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/posix_acl.h>
#include <linux/random.h>
#include <linux/seq_file.h>
#include <linux/statfs.h>
#include <linux/string.h>
#include <linux/xattr.h>
static struct kmem_cache *bch2_inode_cache;
static void bch2_vfs_inode_init(struct btree_trans *, subvol_inum,
struct bch_inode_info *,
struct bch_inode_unpacked *,
struct bch_subvolume *);
void bch2_inode_update_after_write(struct btree_trans *trans,
struct bch_inode_info *inode,
struct bch_inode_unpacked *bi,
unsigned fields)
{
struct bch_fs *c = trans->c;
BUG_ON(bi->bi_inum != inode->v.i_ino);
bch2_assert_pos_locked(trans, BTREE_ID_inodes,
POS(0, bi->bi_inum),
c->opts.inodes_use_key_cache);
set_nlink(&inode->v, bch2_inode_nlink_get(bi));
i_uid_write(&inode->v, bi->bi_uid);
i_gid_write(&inode->v, bi->bi_gid);
inode->v.i_mode = bi->bi_mode;
if (fields & ATTR_ATIME)
inode_set_atime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_atime));
if (fields & ATTR_MTIME)
inode_set_mtime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_mtime));
if (fields & ATTR_CTIME)
inode_set_ctime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_ctime));
inode->ei_inode = *bi;
bch2_inode_flags_to_vfs(inode);
}
int __must_check bch2_write_inode(struct bch_fs *c,
struct bch_inode_info *inode,
inode_set_fn set,
void *p, unsigned fields)
{
struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter = { NULL };
struct bch_inode_unpacked inode_u;
int ret;
retry:
bch2_trans_begin(trans);
ret = bch2_inode_peek(trans, &iter, &inode_u, inode_inum(inode),
BTREE_ITER_INTENT) ?:
(set ? set(trans, inode, &inode_u, p) : 0) ?:
bch2_inode_write(trans, &iter, &inode_u) ?:
bch2_trans_commit(trans, NULL, NULL, BTREE_INSERT_NOFAIL);
/*
* the btree node lock protects inode->ei_inode, not ei_update_lock;
* this is important for inode updates via bchfs_write_index_update
*/
if (!ret)
bch2_inode_update_after_write(trans, inode, &inode_u, fields);
bch2_trans_iter_exit(trans, &iter);
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
bch2_fs_fatal_err_on(bch2_err_matches(ret, ENOENT), c,
"inode %u:%llu not found when updating",
inode_inum(inode).subvol,
inode_inum(inode).inum);
bch2_trans_put(trans);
return ret < 0 ? ret : 0;
}
int bch2_fs_quota_transfer(struct bch_fs *c,
struct bch_inode_info *inode,
struct bch_qid new_qid,
unsigned qtypes,
enum quota_acct_mode mode)
{
unsigned i;
int ret;
qtypes &= enabled_qtypes(c);
for (i = 0; i < QTYP_NR; i++)
if (new_qid.q[i] == inode->ei_qid.q[i])
qtypes &= ~(1U << i);
if (!qtypes)
return 0;
mutex_lock(&inode->ei_quota_lock);
ret = bch2_quota_transfer(c, qtypes, new_qid,
inode->ei_qid,
inode->v.i_blocks +
inode->ei_quota_reserved,
mode);
if (!ret)
for (i = 0; i < QTYP_NR; i++)
if (qtypes & (1 << i))
inode->ei_qid.q[i] = new_qid.q[i];
mutex_unlock(&inode->ei_quota_lock);
return ret;
}
static int bch2_iget5_test(struct inode *vinode, void *p)
{
struct bch_inode_info *inode = to_bch_ei(vinode);
subvol_inum *inum = p;
return inode->ei_subvol == inum->subvol &&
inode->ei_inode.bi_inum == inum->inum;
}
static int bch2_iget5_set(struct inode *vinode, void *p)
{
struct bch_inode_info *inode = to_bch_ei(vinode);
subvol_inum *inum = p;
inode->v.i_ino = inum->inum;
inode->ei_subvol = inum->subvol;
inode->ei_inode.bi_inum = inum->inum;
return 0;
}
static unsigned bch2_inode_hash(subvol_inum inum)
{
return jhash_3words(inum.subvol, inum.inum >> 32, inum.inum, JHASH_INITVAL);
}
struct inode *bch2_vfs_inode_get(struct bch_fs *c, subvol_inum inum)
{
struct bch_inode_unpacked inode_u;
struct bch_inode_info *inode;
struct btree_trans *trans;
struct bch_subvolume subvol;
int ret;
inode = to_bch_ei(iget5_locked(c->vfs_sb,
bch2_inode_hash(inum),
bch2_iget5_test,
bch2_iget5_set,
&inum));
if (unlikely(!inode))
return ERR_PTR(-ENOMEM);
if (!(inode->v.i_state & I_NEW))
return &inode->v;
trans = bch2_trans_get(c);
ret = lockrestart_do(trans,
bch2_subvolume_get(trans, inum.subvol, true, 0, &subvol) ?:
bch2_inode_find_by_inum_trans(trans, inum, &inode_u));
if (!ret)
bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol);
bch2_trans_put(trans);
if (ret) {
iget_failed(&inode->v);
return ERR_PTR(bch2_err_class(ret));
}
mutex_lock(&c->vfs_inodes_lock);
list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
mutex_unlock(&c->vfs_inodes_lock);
unlock_new_inode(&inode->v);
return &inode->v;
}
struct bch_inode_info *
__bch2_create(struct mnt_idmap *idmap,
struct bch_inode_info *dir, struct dentry *dentry,
umode_t mode, dev_t rdev, subvol_inum snapshot_src,
unsigned flags)
{
struct bch_fs *c = dir->v.i_sb->s_fs_info;
struct btree_trans *trans;
struct bch_inode_unpacked dir_u;
struct bch_inode_info *inode, *old;
struct bch_inode_unpacked inode_u;
struct posix_acl *default_acl = NULL, *acl = NULL;
subvol_inum inum;
struct bch_subvolume subvol;
u64 journal_seq = 0;
int ret;
/*
* preallocate acls + vfs inode before btree transaction, so that
* nothing can fail after the transaction succeeds:
*/
#ifdef CONFIG_BCACHEFS_POSIX_ACL
ret = posix_acl_create(&dir->v, &mode, &default_acl, &acl);
if (ret)
return ERR_PTR(ret);
#endif
inode = to_bch_ei(new_inode(c->vfs_sb));
if (unlikely(!inode)) {
inode = ERR_PTR(-ENOMEM);
goto err;
}
bch2_inode_init_early(c, &inode_u);
if (!(flags & BCH_CREATE_TMPFILE))
mutex_lock(&dir->ei_update_lock);
trans = bch2_trans_get(c);
retry:
bch2_trans_begin(trans);
ret = bch2_create_trans(trans,
inode_inum(dir), &dir_u, &inode_u,
!(flags & BCH_CREATE_TMPFILE)
? &dentry->d_name : NULL,
from_kuid(i_user_ns(&dir->v), current_fsuid()),
from_kgid(i_user_ns(&dir->v), current_fsgid()),
mode, rdev,
default_acl, acl, snapshot_src, flags) ?:
bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, 1,
KEY_TYPE_QUOTA_PREALLOC);
if (unlikely(ret))
goto err_before_quota;
inum.subvol = inode_u.bi_subvol ?: dir->ei_subvol;
inum.inum = inode_u.bi_inum;
ret = bch2_subvolume_get(trans, inum.subvol, true,
BTREE_ITER_WITH_UPDATES, &subvol) ?:
bch2_trans_commit(trans, NULL, &journal_seq, 0);
if (unlikely(ret)) {
bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, -1,
KEY_TYPE_QUOTA_WARN);
err_before_quota:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
goto err_trans;
}
if (!(flags & BCH_CREATE_TMPFILE)) {
bch2_inode_update_after_write(trans, dir, &dir_u,
ATTR_MTIME|ATTR_CTIME);
mutex_unlock(&dir->ei_update_lock);
}
bch2_iget5_set(&inode->v, &inum);
bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol);
set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
set_cached_acl(&inode->v, ACL_TYPE_DEFAULT, default_acl);
/*
* we must insert the new inode into the inode cache before calling
* bch2_trans_exit() and dropping locks, else we could race with another
* thread pulling the inode in and modifying it:
*/
inode->v.i_state |= I_CREATING;
old = to_bch_ei(inode_insert5(&inode->v,
bch2_inode_hash(inum),
bch2_iget5_test,
bch2_iget5_set,
&inum));
BUG_ON(!old);
if (unlikely(old != inode)) {
/*
* We raced, another process pulled the new inode into cache
* before us:
*/
make_bad_inode(&inode->v);
iput(&inode->v);
inode = old;
} else {
mutex_lock(&c->vfs_inodes_lock);
list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
mutex_unlock(&c->vfs_inodes_lock);
/*
* we really don't want insert_inode_locked2() to be setting
* I_NEW...
*/
unlock_new_inode(&inode->v);
}
bch2_trans_put(trans);
err:
posix_acl_release(default_acl);
posix_acl_release(acl);
return inode;
err_trans:
if (!(flags & BCH_CREATE_TMPFILE))
mutex_unlock(&dir->ei_update_lock);
bch2_trans_put(trans);
make_bad_inode(&inode->v);
iput(&inode->v);
inode = ERR_PTR(ret);
goto err;
}
/* methods */
static struct dentry *bch2_lookup(struct inode *vdir, struct dentry *dentry,
unsigned int flags)
{
struct bch_fs *c = vdir->i_sb->s_fs_info;
struct bch_inode_info *dir = to_bch_ei(vdir);
struct bch_hash_info hash = bch2_hash_info_init(c, &dir->ei_inode);
struct inode *vinode = NULL;
subvol_inum inum = { .subvol = 1 };
int ret;
ret = bch2_dirent_lookup(c, inode_inum(dir), &hash,
&dentry->d_name, &inum);
if (!ret)
vinode = bch2_vfs_inode_get(c, inum);
return d_splice_alias(vinode, dentry);
}
static int bch2_mknod(struct mnt_idmap *idmap,
struct inode *vdir, struct dentry *dentry,
umode_t mode, dev_t rdev)
{
struct bch_inode_info *inode =
__bch2_create(idmap, to_bch_ei(vdir), dentry, mode, rdev,
(subvol_inum) { 0 }, 0);
if (IS_ERR(inode))
return bch2_err_class(PTR_ERR(inode));
d_instantiate(dentry, &inode->v);
return 0;
}
static int bch2_create(struct mnt_idmap *idmap,
struct inode *vdir, struct dentry *dentry,
umode_t mode, bool excl)
{
return bch2_mknod(idmap, vdir, dentry, mode|S_IFREG, 0);
}
static int __bch2_link(struct bch_fs *c,
struct bch_inode_info *inode,
struct bch_inode_info *dir,
struct dentry *dentry)
{
struct btree_trans *trans = bch2_trans_get(c);
struct bch_inode_unpacked dir_u, inode_u;
int ret;
mutex_lock(&inode->ei_update_lock);
ret = commit_do(trans, NULL, NULL, 0,
bch2_link_trans(trans,
inode_inum(dir), &dir_u,
inode_inum(inode), &inode_u,
&dentry->d_name));
if (likely(!ret)) {
bch2_inode_update_after_write(trans, dir, &dir_u,
ATTR_MTIME|ATTR_CTIME);
bch2_inode_update_after_write(trans, inode, &inode_u, ATTR_CTIME);
}
bch2_trans_put(trans);
mutex_unlock(&inode->ei_update_lock);
return ret;
}
static int bch2_link(struct dentry *old_dentry, struct inode *vdir,
struct dentry *dentry)
{
struct bch_fs *c = vdir->i_sb->s_fs_info;
struct bch_inode_info *dir = to_bch_ei(vdir);
struct bch_inode_info *inode = to_bch_ei(old_dentry->d_inode);
int ret;
lockdep_assert_held(&inode->v.i_rwsem);
ret = __bch2_link(c, inode, dir, dentry);
if (unlikely(ret))
return ret;
ihold(&inode->v);
d_instantiate(dentry, &inode->v);
return 0;
}
int __bch2_unlink(struct inode *vdir, struct dentry *dentry,
bool deleting_snapshot)
{
struct bch_fs *c = vdir->i_sb->s_fs_info;
struct bch_inode_info *dir = to_bch_ei(vdir);
struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
struct bch_inode_unpacked dir_u, inode_u;
struct btree_trans *trans = bch2_trans_get(c);
int ret;
bch2_lock_inodes(INODE_UPDATE_LOCK, dir, inode);
ret = commit_do(trans, NULL, NULL,
BTREE_INSERT_NOFAIL,
bch2_unlink_trans(trans,
inode_inum(dir), &dir_u,
&inode_u, &dentry->d_name,
deleting_snapshot));
if (unlikely(ret))
goto err;
bch2_inode_update_after_write(trans, dir, &dir_u,
ATTR_MTIME|ATTR_CTIME);
bch2_inode_update_after_write(trans, inode, &inode_u,
ATTR_MTIME);
if (inode_u.bi_subvol) {
/*
* Subvolume deletion is asynchronous, but we still want to tell
* the VFS that it's been deleted here:
*/
set_nlink(&inode->v, 0);
}
err:
bch2_unlock_inodes(INODE_UPDATE_LOCK, dir, inode);
bch2_trans_put(trans);
return ret;
}
static int bch2_unlink(struct inode *vdir, struct dentry *dentry)
{
return __bch2_unlink(vdir, dentry, false);
}
static int bch2_symlink(struct mnt_idmap *idmap,
struct inode *vdir, struct dentry *dentry,
const char *symname)
{
struct bch_fs *c = vdir->i_sb->s_fs_info;
struct bch_inode_info *dir = to_bch_ei(vdir), *inode;
int ret;
inode = __bch2_create(idmap, dir, dentry, S_IFLNK|S_IRWXUGO, 0,
(subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
if (IS_ERR(inode))
return bch2_err_class(PTR_ERR(inode));
inode_lock(&inode->v);
ret = page_symlink(&inode->v, symname, strlen(symname) + 1);
inode_unlock(&inode->v);
if (unlikely(ret))
goto err;
ret = filemap_write_and_wait_range(inode->v.i_mapping, 0, LLONG_MAX);
if (unlikely(ret))
goto err;
ret = __bch2_link(c, inode, dir, dentry);
if (unlikely(ret))
goto err;
d_instantiate(dentry, &inode->v);
return 0;
err:
iput(&inode->v);
return ret;
}
static int bch2_mkdir(struct mnt_idmap *idmap,
struct inode *vdir, struct dentry *dentry, umode_t mode)
{
return bch2_mknod(idmap, vdir, dentry, mode|S_IFDIR, 0);
}
static int bch2_rename2(struct mnt_idmap *idmap,
struct inode *src_vdir, struct dentry *src_dentry,
struct inode *dst_vdir, struct dentry *dst_dentry,
unsigned flags)
{
struct bch_fs *c = src_vdir->i_sb->s_fs_info;
struct bch_inode_info *src_dir = to_bch_ei(src_vdir);
struct bch_inode_info *dst_dir = to_bch_ei(dst_vdir);
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 btree_trans *trans;
enum bch_rename_mode mode = flags & RENAME_EXCHANGE
? BCH_RENAME_EXCHANGE
: dst_dentry->d_inode
? BCH_RENAME_OVERWRITE : BCH_RENAME;
int ret;
if (flags & ~(RENAME_NOREPLACE|RENAME_EXCHANGE))
return -EINVAL;
if (mode == BCH_RENAME_OVERWRITE) {
ret = filemap_write_and_wait_range(src_inode->v.i_mapping,
0, LLONG_MAX);
if (ret)
return ret;
}
trans = bch2_trans_get(c);
bch2_lock_inodes(INODE_UPDATE_LOCK,
src_dir,
dst_dir,
src_inode,
dst_inode);
if (inode_attr_changing(dst_dir, src_inode, Inode_opt_project)) {
ret = bch2_fs_quota_transfer(c, src_inode,
dst_dir->ei_qid,
1 << QTYP_PRJ,
KEY_TYPE_QUOTA_PREALLOC);
if (ret)
goto err;
}
if (mode == BCH_RENAME_EXCHANGE &&
inode_attr_changing(src_dir, dst_inode, Inode_opt_project)) {
ret = bch2_fs_quota_transfer(c, dst_inode,
src_dir->ei_qid,
1 << QTYP_PRJ,
KEY_TYPE_QUOTA_PREALLOC);
if (ret)
goto err;
}
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));
if (unlikely(ret))
goto err;
BUG_ON(src_inode->v.i_ino != src_inode_u.bi_inum);
BUG_ON(dst_inode &&
dst_inode->v.i_ino != dst_inode_u.bi_inum);
bch2_inode_update_after_write(trans, src_dir, &src_dir_u,
ATTR_MTIME|ATTR_CTIME);
if (src_dir != dst_dir)
bch2_inode_update_after_write(trans, dst_dir, &dst_dir_u,
ATTR_MTIME|ATTR_CTIME);
bch2_inode_update_after_write(trans, src_inode, &src_inode_u,
ATTR_CTIME);
if (dst_inode)
bch2_inode_update_after_write(trans, dst_inode, &dst_inode_u,
ATTR_CTIME);
err:
bch2_trans_put(trans);
bch2_fs_quota_transfer(c, src_inode,
bch_qid(&src_inode->ei_inode),
1 << QTYP_PRJ,
KEY_TYPE_QUOTA_NOCHECK);
if (dst_inode)
bch2_fs_quota_transfer(c, dst_inode,
bch_qid(&dst_inode->ei_inode),
1 << QTYP_PRJ,
KEY_TYPE_QUOTA_NOCHECK);
bch2_unlock_inodes(INODE_UPDATE_LOCK,
src_dir,
dst_dir,
src_inode,
dst_inode);
return ret;
}
static void bch2_setattr_copy(struct mnt_idmap *idmap,
struct bch_inode_info *inode,
struct bch_inode_unpacked *bi,
struct iattr *attr)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
unsigned int ia_valid = attr->ia_valid;
if (ia_valid & ATTR_UID)
bi->bi_uid = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
if (ia_valid & ATTR_GID)
bi->bi_gid = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
if (ia_valid & ATTR_SIZE)
bi->bi_size = attr->ia_size;
if (ia_valid & ATTR_ATIME)
bi->bi_atime = timespec_to_bch2_time(c, attr->ia_atime);
if (ia_valid & ATTR_MTIME)
bi->bi_mtime = timespec_to_bch2_time(c, attr->ia_mtime);
if (ia_valid & ATTR_CTIME)
bi->bi_ctime = timespec_to_bch2_time(c, attr->ia_ctime);
if (ia_valid & ATTR_MODE) {
umode_t mode = attr->ia_mode;
kgid_t gid = ia_valid & ATTR_GID
? attr->ia_gid
: inode->v.i_gid;
if (!in_group_p(gid) &&
!capable_wrt_inode_uidgid(idmap, &inode->v, CAP_FSETID))
mode &= ~S_ISGID;
bi->bi_mode = mode;
}
}
int bch2_setattr_nonsize(struct mnt_idmap *idmap,
struct bch_inode_info *inode,
struct iattr *attr)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
struct bch_qid qid;
struct btree_trans *trans;
struct btree_iter inode_iter = { NULL };
struct bch_inode_unpacked inode_u;
struct posix_acl *acl = NULL;
int ret;
mutex_lock(&inode->ei_update_lock);
qid = inode->ei_qid;
if (attr->ia_valid & ATTR_UID)
qid.q[QTYP_USR] = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
if (attr->ia_valid & ATTR_GID)
qid.q[QTYP_GRP] = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
ret = bch2_fs_quota_transfer(c, inode, qid, ~0,
KEY_TYPE_QUOTA_PREALLOC);
if (ret)
goto err;
trans = bch2_trans_get(c);
retry:
bch2_trans_begin(trans);
kfree(acl);
acl = NULL;
ret = bch2_inode_peek(trans, &inode_iter, &inode_u, inode_inum(inode),
BTREE_ITER_INTENT);
if (ret)
goto btree_err;
bch2_setattr_copy(idmap, inode, &inode_u, attr);
if (attr->ia_valid & ATTR_MODE) {
ret = bch2_acl_chmod(trans, inode_inum(inode), &inode_u,
inode_u.bi_mode, &acl);
if (ret)
goto btree_err;
}
ret = bch2_inode_write(trans, &inode_iter, &inode_u) ?:
bch2_trans_commit(trans, NULL, NULL,
BTREE_INSERT_NOFAIL);
btree_err:
bch2_trans_iter_exit(trans, &inode_iter);
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
if (unlikely(ret))
goto err_trans;
bch2_inode_update_after_write(trans, inode, &inode_u, attr->ia_valid);
if (acl)
set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
err_trans:
bch2_trans_put(trans);
err:
mutex_unlock(&inode->ei_update_lock);
return bch2_err_class(ret);
}
static int bch2_getattr(struct mnt_idmap *idmap,
const struct path *path, struct kstat *stat,
u32 request_mask, unsigned query_flags)
{
struct bch_inode_info *inode = to_bch_ei(d_inode(path->dentry));
struct bch_fs *c = inode->v.i_sb->s_fs_info;
stat->dev = inode->v.i_sb->s_dev;
stat->ino = inode->v.i_ino;
stat->mode = inode->v.i_mode;
stat->nlink = inode->v.i_nlink;
stat->uid = inode->v.i_uid;
stat->gid = inode->v.i_gid;
stat->rdev = inode->v.i_rdev;
stat->size = i_size_read(&inode->v);
stat->atime = inode_get_atime(&inode->v);
stat->mtime = inode_get_mtime(&inode->v);
stat->ctime = inode_get_ctime(&inode->v);
stat->blksize = block_bytes(c);
stat->blocks = inode->v.i_blocks;
if (request_mask & STATX_BTIME) {
stat->result_mask |= STATX_BTIME;
stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime);
}
if (inode->ei_inode.bi_flags & BCH_INODE_immutable)
stat->attributes |= STATX_ATTR_IMMUTABLE;
stat->attributes_mask |= STATX_ATTR_IMMUTABLE;
if (inode->ei_inode.bi_flags & BCH_INODE_append)
stat->attributes |= STATX_ATTR_APPEND;
stat->attributes_mask |= STATX_ATTR_APPEND;
if (inode->ei_inode.bi_flags & BCH_INODE_nodump)
stat->attributes |= STATX_ATTR_NODUMP;
stat->attributes_mask |= STATX_ATTR_NODUMP;
return 0;
}
static int bch2_setattr(struct mnt_idmap *idmap,
struct dentry *dentry, struct iattr *iattr)
{
struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
int ret;
lockdep_assert_held(&inode->v.i_rwsem);
ret = setattr_prepare(idmap, dentry, iattr);
if (ret)
return ret;
return iattr->ia_valid & ATTR_SIZE
? bchfs_truncate(idmap, inode, iattr)
: bch2_setattr_nonsize(idmap, inode, iattr);
}
static int bch2_tmpfile(struct mnt_idmap *idmap,
struct inode *vdir, struct file *file, umode_t mode)
{
struct bch_inode_info *inode =
__bch2_create(idmap, to_bch_ei(vdir),
file->f_path.dentry, mode, 0,
(subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
if (IS_ERR(inode))
return bch2_err_class(PTR_ERR(inode));
d_mark_tmpfile(file, &inode->v);
d_instantiate(file->f_path.dentry, &inode->v);
return finish_open_simple(file, 0);
}
static int bch2_fill_extent(struct bch_fs *c,
struct fiemap_extent_info *info,
struct bkey_s_c k, unsigned flags)
{
if (bkey_extent_is_direct_data(k.k)) {
struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
const union bch_extent_entry *entry;
struct extent_ptr_decoded p;
int ret;
if (k.k->type == KEY_TYPE_reflink_v)
flags |= FIEMAP_EXTENT_SHARED;
bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
int flags2 = 0;
u64 offset = p.ptr.offset;
if (p.ptr.unwritten)
flags2 |= FIEMAP_EXTENT_UNWRITTEN;
if (p.crc.compression_type)
flags2 |= FIEMAP_EXTENT_ENCODED;
else
offset += p.crc.offset;
if ((offset & (block_sectors(c) - 1)) ||
(k.k->size & (block_sectors(c) - 1)))
flags2 |= FIEMAP_EXTENT_NOT_ALIGNED;
ret = fiemap_fill_next_extent(info,
bkey_start_offset(k.k) << 9,
offset << 9,
k.k->size << 9, flags|flags2);
if (ret)
return ret;
}
return 0;
} else if (bkey_extent_is_inline_data(k.k)) {
return fiemap_fill_next_extent(info,
bkey_start_offset(k.k) << 9,
0, k.k->size << 9,
flags|
FIEMAP_EXTENT_DATA_INLINE);
} else if (k.k->type == KEY_TYPE_reservation) {
return fiemap_fill_next_extent(info,
bkey_start_offset(k.k) << 9,
0, k.k->size << 9,
flags|
FIEMAP_EXTENT_DELALLOC|
FIEMAP_EXTENT_UNWRITTEN);
} else {
BUG();
}
}
static int bch2_fiemap(struct inode *vinode, struct fiemap_extent_info *info,
u64 start, u64 len)
{
struct bch_fs *c = vinode->i_sb->s_fs_info;
struct bch_inode_info *ei = to_bch_ei(vinode);
struct btree_trans *trans;
struct btree_iter iter;
struct bkey_s_c k;
struct bkey_buf cur, prev;
struct bpos end = POS(ei->v.i_ino, (start + len) >> 9);
unsigned offset_into_extent, sectors;
bool have_extent = false;
u32 snapshot;
int ret = 0;
ret = fiemap_prep(&ei->v, info, start, &len, FIEMAP_FLAG_SYNC);
if (ret)
return ret;
if (start + len < start)
return -EINVAL;
start >>= 9;
bch2_bkey_buf_init(&cur);
bch2_bkey_buf_init(&prev);
trans = bch2_trans_get(c);
retry:
bch2_trans_begin(trans);
ret = bch2_subvolume_get_snapshot(trans, ei->ei_subvol, &snapshot);
if (ret)
goto err;
bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
SPOS(ei->v.i_ino, start, snapshot), 0);
while (!(ret = btree_trans_too_many_iters(trans)) &&
(k = bch2_btree_iter_peek_upto(&iter, end)).k &&
!(ret = bkey_err(k))) {
enum btree_id data_btree = BTREE_ID_extents;
if (!bkey_extent_is_data(k.k) &&
k.k->type != KEY_TYPE_reservation) {
bch2_btree_iter_advance(&iter);
continue;
}
offset_into_extent = iter.pos.offset -
bkey_start_offset(k.k);
sectors = k.k->size - offset_into_extent;
bch2_bkey_buf_reassemble(&cur, c, k);
ret = bch2_read_indirect_extent(trans, &data_btree,
&offset_into_extent, &cur);
if (ret)
break;
k = bkey_i_to_s_c(cur.k);
bch2_bkey_buf_realloc(&prev, c, k.k->u64s);
sectors = min(sectors, k.k->size - offset_into_extent);
bch2_cut_front(POS(k.k->p.inode,
bkey_start_offset(k.k) +
offset_into_extent),
cur.k);
bch2_key_resize(&cur.k->k, sectors);
cur.k->k.p = iter.pos;
cur.k->k.p.offset += cur.k->k.size;
if (have_extent) {
bch2_trans_unlock(trans);
ret = bch2_fill_extent(c, info,
bkey_i_to_s_c(prev.k), 0);
if (ret)
break;
}
bkey_copy(prev.k, cur.k);
have_extent = true;
bch2_btree_iter_set_pos(&iter,
POS(iter.pos.inode, iter.pos.offset + sectors));
}
start = iter.pos.offset;
bch2_trans_iter_exit(trans, &iter);
err:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
if (!ret && have_extent) {
bch2_trans_unlock(trans);
ret = bch2_fill_extent(c, info, bkey_i_to_s_c(prev.k),
FIEMAP_EXTENT_LAST);
}
bch2_trans_put(trans);
bch2_bkey_buf_exit(&cur, c);
bch2_bkey_buf_exit(&prev, c);
return ret < 0 ? ret : 0;
}
static const struct vm_operations_struct bch_vm_ops = {
.fault = bch2_page_fault,
.map_pages = filemap_map_pages,
.page_mkwrite = bch2_page_mkwrite,
};
static int bch2_mmap(struct file *file, struct vm_area_struct *vma)
{
file_accessed(file);
vma->vm_ops = &bch_vm_ops;
return 0;
}
/* Directories: */
static loff_t bch2_dir_llseek(struct file *file, loff_t offset, int whence)
{
return generic_file_llseek_size(file, offset, whence,
S64_MAX, S64_MAX);
}
static int bch2_vfs_readdir(struct file *file, struct dir_context *ctx)
{
struct bch_inode_info *inode = file_bch_inode(file);
struct bch_fs *c = inode->v.i_sb->s_fs_info;
int ret;
if (!dir_emit_dots(file, ctx))
return 0;
ret = bch2_readdir(c, inode_inum(inode), ctx);
if (ret)
bch_err_fn(c, ret);
return bch2_err_class(ret);
}
static const struct file_operations bch_file_operations = {
.llseek = bch2_llseek,
.read_iter = bch2_read_iter,
.write_iter = bch2_write_iter,
.mmap = bch2_mmap,
.open = generic_file_open,
.fsync = bch2_fsync,
.splice_read = filemap_splice_read,
.splice_write = iter_file_splice_write,
.fallocate = bch2_fallocate_dispatch,
.unlocked_ioctl = bch2_fs_file_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = bch2_compat_fs_ioctl,
#endif
.remap_file_range = bch2_remap_file_range,
};
static const struct inode_operations bch_file_inode_operations = {
.getattr = bch2_getattr,
.setattr = bch2_setattr,
.fiemap = bch2_fiemap,
.listxattr = bch2_xattr_list,
#ifdef CONFIG_BCACHEFS_POSIX_ACL
.get_acl = bch2_get_acl,
.set_acl = bch2_set_acl,
#endif
};
static const struct inode_operations bch_dir_inode_operations = {
.lookup = bch2_lookup,
.create = bch2_create,
.link = bch2_link,
.unlink = bch2_unlink,
.symlink = bch2_symlink,
.mkdir = bch2_mkdir,
.rmdir = bch2_unlink,
.mknod = bch2_mknod,
.rename = bch2_rename2,
.getattr = bch2_getattr,
.setattr = bch2_setattr,
.tmpfile = bch2_tmpfile,
.listxattr = bch2_xattr_list,
#ifdef CONFIG_BCACHEFS_POSIX_ACL
.get_acl = bch2_get_acl,
.set_acl = bch2_set_acl,
#endif
};
static const struct file_operations bch_dir_file_operations = {
.llseek = bch2_dir_llseek,
.read = generic_read_dir,
.iterate_shared = bch2_vfs_readdir,
.fsync = bch2_fsync,
.unlocked_ioctl = bch2_fs_file_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = bch2_compat_fs_ioctl,
#endif
};
static const struct inode_operations bch_symlink_inode_operations = {
.get_link = page_get_link,
.getattr = bch2_getattr,
.setattr = bch2_setattr,
.listxattr = bch2_xattr_list,
#ifdef CONFIG_BCACHEFS_POSIX_ACL
.get_acl = bch2_get_acl,
.set_acl = bch2_set_acl,
#endif
};
static const struct inode_operations bch_special_inode_operations = {
.getattr = bch2_getattr,
.setattr = bch2_setattr,
.listxattr = bch2_xattr_list,
#ifdef CONFIG_BCACHEFS_POSIX_ACL
.get_acl = bch2_get_acl,
.set_acl = bch2_set_acl,
#endif
};
static const struct address_space_operations bch_address_space_operations = {
.read_folio = bch2_read_folio,
.writepages = bch2_writepages,
.readahead = bch2_readahead,
.dirty_folio = filemap_dirty_folio,
.write_begin = bch2_write_begin,
.write_end = bch2_write_end,
.invalidate_folio = bch2_invalidate_folio,
.release_folio = bch2_release_folio,
.direct_IO = noop_direct_IO,
#ifdef CONFIG_MIGRATION
.migrate_folio = filemap_migrate_folio,
#endif
.error_remove_folio = generic_error_remove_folio,
};
struct bcachefs_fid {
u64 inum;
u32 subvol;
u32 gen;
} __packed;
struct bcachefs_fid_with_parent {
struct bcachefs_fid fid;
struct bcachefs_fid dir;
} __packed;
static int bcachefs_fid_valid(int fh_len, int fh_type)
{
switch (fh_type) {
case FILEID_BCACHEFS_WITHOUT_PARENT:
return fh_len == sizeof(struct bcachefs_fid) / sizeof(u32);
case FILEID_BCACHEFS_WITH_PARENT:
return fh_len == sizeof(struct bcachefs_fid_with_parent) / sizeof(u32);
default:
return false;
}
}
static struct bcachefs_fid bch2_inode_to_fid(struct bch_inode_info *inode)
{
return (struct bcachefs_fid) {
.inum = inode->ei_inode.bi_inum,
.subvol = inode->ei_subvol,
.gen = inode->ei_inode.bi_generation,
};
}
static int bch2_encode_fh(struct inode *vinode, u32 *fh, int *len,
struct inode *vdir)
{
struct bch_inode_info *inode = to_bch_ei(vinode);
struct bch_inode_info *dir = to_bch_ei(vdir);
if (*len < sizeof(struct bcachefs_fid_with_parent) / sizeof(u32))
return FILEID_INVALID;
if (!S_ISDIR(inode->v.i_mode) && dir) {
struct bcachefs_fid_with_parent *fid = (void *) fh;
fid->fid = bch2_inode_to_fid(inode);
fid->dir = bch2_inode_to_fid(dir);
*len = sizeof(*fid) / sizeof(u32);
return FILEID_BCACHEFS_WITH_PARENT;
} else {
struct bcachefs_fid *fid = (void *) fh;
*fid = bch2_inode_to_fid(inode);
*len = sizeof(*fid) / sizeof(u32);
return FILEID_BCACHEFS_WITHOUT_PARENT;
}
}
static struct inode *bch2_nfs_get_inode(struct super_block *sb,
struct bcachefs_fid fid)
{
struct bch_fs *c = sb->s_fs_info;
struct inode *vinode = bch2_vfs_inode_get(c, (subvol_inum) {
.subvol = fid.subvol,
.inum = fid.inum,
});
if (!IS_ERR(vinode) && vinode->i_generation != fid.gen) {
iput(vinode);
vinode = ERR_PTR(-ESTALE);
}
return vinode;
}
static struct dentry *bch2_fh_to_dentry(struct super_block *sb, struct fid *_fid,
int fh_len, int fh_type)
{
struct bcachefs_fid *fid = (void *) _fid;
if (!bcachefs_fid_valid(fh_len, fh_type))
return NULL;
return d_obtain_alias(bch2_nfs_get_inode(sb, *fid));
}
static struct dentry *bch2_fh_to_parent(struct super_block *sb, struct fid *_fid,
int fh_len, int fh_type)
{
struct bcachefs_fid_with_parent *fid = (void *) _fid;
if (!bcachefs_fid_valid(fh_len, fh_type) ||
fh_type != FILEID_BCACHEFS_WITH_PARENT)
return NULL;
return d_obtain_alias(bch2_nfs_get_inode(sb, fid->dir));
}
static struct dentry *bch2_get_parent(struct dentry *child)
{
struct bch_inode_info *inode = to_bch_ei(child->d_inode);
struct bch_fs *c = inode->v.i_sb->s_fs_info;
subvol_inum parent_inum = {
.subvol = inode->ei_inode.bi_parent_subvol ?:
inode->ei_subvol,
.inum = inode->ei_inode.bi_dir,
};
return d_obtain_alias(bch2_vfs_inode_get(c, parent_inum));
}
static int bch2_get_name(struct dentry *parent, char *name, struct dentry *child)
{
struct bch_inode_info *inode = to_bch_ei(child->d_inode);
struct bch_inode_info *dir = to_bch_ei(parent->d_inode);
struct bch_fs *c = inode->v.i_sb->s_fs_info;
struct btree_trans *trans;
struct btree_iter iter1;
struct btree_iter iter2;
struct bkey_s_c k;
struct bkey_s_c_dirent d;
struct bch_inode_unpacked inode_u;
subvol_inum target;
u32 snapshot;
struct qstr dirent_name;
unsigned name_len = 0;
int ret;
if (!S_ISDIR(dir->v.i_mode))
return -EINVAL;
trans = bch2_trans_get(c);
bch2_trans_iter_init(trans, &iter1, BTREE_ID_dirents,
POS(dir->ei_inode.bi_inum, 0), 0);
bch2_trans_iter_init(trans, &iter2, BTREE_ID_dirents,
POS(dir->ei_inode.bi_inum, 0), 0);
retry:
bch2_trans_begin(trans);
ret = bch2_subvolume_get_snapshot(trans, dir->ei_subvol, &snapshot);
if (ret)
goto err;
bch2_btree_iter_set_snapshot(&iter1, snapshot);
bch2_btree_iter_set_snapshot(&iter2, snapshot);
ret = bch2_inode_find_by_inum_trans(trans, inode_inum(inode), &inode_u);
if (ret)
goto err;
if (inode_u.bi_dir == dir->ei_inode.bi_inum) {
bch2_btree_iter_set_pos(&iter1, POS(inode_u.bi_dir, inode_u.bi_dir_offset));
k = bch2_btree_iter_peek_slot(&iter1);
ret = bkey_err(k);
if (ret)
goto err;
if (k.k->type != KEY_TYPE_dirent) {
ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
goto err;
}
d = bkey_s_c_to_dirent(k);
ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target);
if (ret > 0)
ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
if (ret)
goto err;
if (target.subvol == inode->ei_subvol &&
target.inum == inode->ei_inode.bi_inum)
goto found;
} else {
/*
* File with multiple hardlinks and our backref is to the wrong
* directory - linear search:
*/
for_each_btree_key_continue_norestart(iter2, 0, k, ret) {
if (k.k->p.inode > dir->ei_inode.bi_inum)
break;
if (k.k->type != KEY_TYPE_dirent)
continue;
d = bkey_s_c_to_dirent(k);
ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target);
if (ret < 0)
break;
if (ret)
continue;
if (target.subvol == inode->ei_subvol &&
target.inum == inode->ei_inode.bi_inum)
goto found;
}
}
ret = -ENOENT;
goto err;
found:
dirent_name = bch2_dirent_get_name(d);
name_len = min_t(unsigned, dirent_name.len, NAME_MAX);
memcpy(name, dirent_name.name, name_len);
name[name_len] = '\0';
err:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
bch2_trans_iter_exit(trans, &iter1);
bch2_trans_iter_exit(trans, &iter2);
bch2_trans_put(trans);
return ret;
}
static const struct export_operations bch_export_ops = {
.encode_fh = bch2_encode_fh,
.fh_to_dentry = bch2_fh_to_dentry,
.fh_to_parent = bch2_fh_to_parent,
.get_parent = bch2_get_parent,
.get_name = bch2_get_name,
};
static void bch2_vfs_inode_init(struct btree_trans *trans, subvol_inum inum,
struct bch_inode_info *inode,
struct bch_inode_unpacked *bi,
struct bch_subvolume *subvol)
{
bch2_inode_update_after_write(trans, inode, bi, ~0);
if (BCH_SUBVOLUME_SNAP(subvol))
set_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
else
clear_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
inode->v.i_blocks = bi->bi_sectors;
inode->v.i_ino = bi->bi_inum;
inode->v.i_rdev = bi->bi_dev;
inode->v.i_generation = bi->bi_generation;
inode->v.i_size = bi->bi_size;
inode->ei_flags = 0;
inode->ei_quota_reserved = 0;
inode->ei_qid = bch_qid(bi);
inode->ei_subvol = inum.subvol;
inode->v.i_mapping->a_ops = &bch_address_space_operations;
switch (inode->v.i_mode & S_IFMT) {
case S_IFREG:
inode->v.i_op = &bch_file_inode_operations;
inode->v.i_fop = &bch_file_operations;
break;
case S_IFDIR:
inode->v.i_op = &bch_dir_inode_operations;
inode->v.i_fop = &bch_dir_file_operations;
break;
case S_IFLNK:
inode_nohighmem(&inode->v);
inode->v.i_op = &bch_symlink_inode_operations;
break;
default:
init_special_inode(&inode->v, inode->v.i_mode, inode->v.i_rdev);
inode->v.i_op = &bch_special_inode_operations;
break;
}
mapping_set_large_folios(inode->v.i_mapping);
}
static struct inode *bch2_alloc_inode(struct super_block *sb)
{
struct bch_inode_info *inode;
inode = kmem_cache_alloc(bch2_inode_cache, GFP_NOFS);
if (!inode)
return NULL;
inode_init_once(&inode->v);
mutex_init(&inode->ei_update_lock);
two_state_lock_init(&inode->ei_pagecache_lock);
INIT_LIST_HEAD(&inode->ei_vfs_inode_list);
mutex_init(&inode->ei_quota_lock);
return &inode->v;
}
static void bch2_i_callback(struct rcu_head *head)
{
struct inode *vinode = container_of(head, struct inode, i_rcu);
struct bch_inode_info *inode = to_bch_ei(vinode);
kmem_cache_free(bch2_inode_cache, inode);
}
static void bch2_destroy_inode(struct inode *vinode)
{
call_rcu(&vinode->i_rcu, bch2_i_callback);
}
static int inode_update_times_fn(struct btree_trans *trans,
struct bch_inode_info *inode,
struct bch_inode_unpacked *bi,
void *p)
{
struct bch_fs *c = inode->v.i_sb->s_fs_info;
bi->bi_atime = timespec_to_bch2_time(c, inode_get_atime(&inode->v));
bi->bi_mtime = timespec_to_bch2_time(c, inode_get_mtime(&inode->v));
bi->bi_ctime = timespec_to_bch2_time(c, inode_get_ctime(&inode->v));
return 0;
}
static int bch2_vfs_write_inode(struct inode *vinode,
struct writeback_control *wbc)
{
struct bch_fs *c = vinode->i_sb->s_fs_info;
struct bch_inode_info *inode = to_bch_ei(vinode);
int ret;
mutex_lock(&inode->ei_update_lock);
ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
ATTR_ATIME|ATTR_MTIME|ATTR_CTIME);
mutex_unlock(&inode->ei_update_lock);
return bch2_err_class(ret);
}
static void bch2_evict_inode(struct inode *vinode)
{
struct bch_fs *c = vinode->i_sb->s_fs_info;
struct bch_inode_info *inode = to_bch_ei(vinode);
truncate_inode_pages_final(&inode->v.i_data);
clear_inode(&inode->v);
BUG_ON(!is_bad_inode(&inode->v) && inode->ei_quota_reserved);
if (!inode->v.i_nlink && !is_bad_inode(&inode->v)) {
bch2_quota_acct(c, inode->ei_qid, Q_SPC, -((s64) inode->v.i_blocks),
KEY_TYPE_QUOTA_WARN);
bch2_quota_acct(c, inode->ei_qid, Q_INO, -1,
KEY_TYPE_QUOTA_WARN);
bch2_inode_rm(c, inode_inum(inode));
}
mutex_lock(&c->vfs_inodes_lock);
list_del_init(&inode->ei_vfs_inode_list);
mutex_unlock(&c->vfs_inodes_lock);
}
void bch2_evict_subvolume_inodes(struct bch_fs *c, snapshot_id_list *s)
{
struct bch_inode_info *inode, **i;
DARRAY(struct bch_inode_info *) grabbed;
bool clean_pass = false, this_pass_clean;
/*
* Initially, we scan for inodes without I_DONTCACHE, then mark them to
* be pruned with d_mark_dontcache().
*
* Once we've had a clean pass where we didn't find any inodes without
* I_DONTCACHE, we wait for them to be freed:
*/
darray_init(&grabbed);
darray_make_room(&grabbed, 1024);
again:
cond_resched();
this_pass_clean = true;
mutex_lock(&c->vfs_inodes_lock);
list_for_each_entry(inode, &c->vfs_inodes_list, ei_vfs_inode_list) {
if (!snapshot_list_has_id(s, inode->ei_subvol))
continue;
if (!(inode->v.i_state & I_DONTCACHE) &&
!(inode->v.i_state & I_FREEING) &&
igrab(&inode->v)) {
this_pass_clean = false;
if (darray_push_gfp(&grabbed, inode, GFP_ATOMIC|__GFP_NOWARN)) {
iput(&inode->v);
break;
}
} else if (clean_pass && this_pass_clean) {
wait_queue_head_t *wq = bit_waitqueue(&inode->v.i_state, __I_NEW);
DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
mutex_unlock(&c->vfs_inodes_lock);
schedule();
finish_wait(wq, &wait.wq_entry);
goto again;
}
}
mutex_unlock(&c->vfs_inodes_lock);
darray_for_each(grabbed, i) {
inode = *i;
d_mark_dontcache(&inode->v);
d_prune_aliases(&inode->v);
iput(&inode->v);
}
grabbed.nr = 0;
if (!clean_pass || !this_pass_clean) {
clean_pass = this_pass_clean;
goto again;
}
darray_exit(&grabbed);
}
static int bch2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
struct bch_fs *c = sb->s_fs_info;
struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c);
unsigned shift = sb->s_blocksize_bits - 9;
/*
* this assumes inodes take up 64 bytes, which is a decent average
* number:
*/
u64 avail_inodes = ((usage.capacity - usage.used) << 3);
u64 fsid;
buf->f_type = BCACHEFS_STATFS_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = usage.capacity >> shift;
buf->f_bfree = usage.free >> shift;
buf->f_bavail = avail_factor(usage.free) >> shift;
buf->f_files = usage.nr_inodes + avail_inodes;
buf->f_ffree = avail_inodes;
fsid = le64_to_cpup((void *) c->sb.user_uuid.b) ^
le64_to_cpup((void *) c->sb.user_uuid.b + sizeof(u64));
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
buf->f_namelen = BCH_NAME_MAX;
return 0;
}
static int bch2_sync_fs(struct super_block *sb, int wait)
{
struct bch_fs *c = sb->s_fs_info;
int ret;
if (c->opts.journal_flush_disabled)
return 0;
if (!wait) {
bch2_journal_flush_async(&c->journal, NULL);
return 0;
}
ret = bch2_journal_flush(&c->journal);
return bch2_err_class(ret);
}
static struct bch_fs *bch2_path_to_fs(const char *path)
{
struct bch_fs *c;
dev_t dev;
int ret;
ret = lookup_bdev(path, &dev);
if (ret)
return ERR_PTR(ret);
c = bch2_dev_to_fs(dev);
if (c)
closure_put(&c->cl);
return c ?: ERR_PTR(-ENOENT);
}
static char **split_devs(const char *_dev_name, unsigned *nr)
{
char *dev_name = NULL, **devs = NULL, *s;
size_t i = 0, nr_devs = 0;
dev_name = kstrdup(_dev_name, GFP_KERNEL);
if (!dev_name)
return NULL;
for (s = dev_name; s; s = strchr(s + 1, ':'))
nr_devs++;
devs = kcalloc(nr_devs + 1, sizeof(const char *), GFP_KERNEL);
if (!devs) {
kfree(dev_name);
return NULL;
}
while ((s = strsep(&dev_name, ":")))
devs[i++] = s;
*nr = nr_devs;
return devs;
}
static int bch2_remount(struct super_block *sb, int *flags, char *data)
{
struct bch_fs *c = sb->s_fs_info;
struct bch_opts opts = bch2_opts_empty();
int ret;
opt_set(opts, read_only, (*flags & SB_RDONLY) != 0);
ret = bch2_parse_mount_opts(c, &opts, data);
if (ret)
goto err;
if (opts.read_only != c->opts.read_only) {
down_write(&c->state_lock);
if (opts.read_only) {
bch2_fs_read_only(c);
sb->s_flags |= SB_RDONLY;
} else {
ret = bch2_fs_read_write(c);
if (ret) {
bch_err(c, "error going rw: %i", ret);
up_write(&c->state_lock);
ret = -EINVAL;
goto err;
}
sb->s_flags &= ~SB_RDONLY;
}
c->opts.read_only = opts.read_only;
up_write(&c->state_lock);
}
if (opt_defined(opts, errors))
c->opts.errors = opts.errors;
err:
return bch2_err_class(ret);
}
static int bch2_show_devname(struct seq_file *seq, struct dentry *root)
{
struct bch_fs *c = root->d_sb->s_fs_info;
struct bch_dev *ca;
unsigned i;
bool first = true;
for_each_online_member(ca, c, i) {
if (!first)
seq_putc(seq, ':');
first = false;
seq_puts(seq, ca->disk_sb.sb_name);
}
return 0;
}
static int bch2_show_options(struct seq_file *seq, struct dentry *root)
{
struct bch_fs *c = root->d_sb->s_fs_info;
enum bch_opt_id i;
struct printbuf buf = PRINTBUF;
int ret = 0;
for (i = 0; i < bch2_opts_nr; i++) {
const struct bch_option *opt = &bch2_opt_table[i];
u64 v = bch2_opt_get_by_id(&c->opts, i);
if (!(opt->flags & OPT_MOUNT))
continue;
if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
continue;
printbuf_reset(&buf);
bch2_opt_to_text(&buf, c, c->disk_sb.sb, opt, v,
OPT_SHOW_MOUNT_STYLE);
seq_putc(seq, ',');
seq_puts(seq, buf.buf);
}
if (buf.allocation_failure)
ret = -ENOMEM;
printbuf_exit(&buf);
return ret;
}
static void bch2_put_super(struct super_block *sb)
{
struct bch_fs *c = sb->s_fs_info;
__bch2_fs_stop(c);
}
/*
* bcachefs doesn't currently integrate intwrite freeze protection but the
* internal write references serve the same purpose. Therefore reuse the
* read-only transition code to perform the quiesce. The caveat is that we don't
* currently have the ability to block tasks that want a write reference while
* the superblock is frozen. This is fine for now, but we should either add
* blocking support or find a way to integrate sb_start_intwrite() and friends.
*/
static int bch2_freeze(struct super_block *sb)
{
struct bch_fs *c = sb->s_fs_info;
down_write(&c->state_lock);
bch2_fs_read_only(c);
up_write(&c->state_lock);
return 0;
}
static int bch2_unfreeze(struct super_block *sb)
{
struct bch_fs *c = sb->s_fs_info;
int ret;
down_write(&c->state_lock);
ret = bch2_fs_read_write(c);
up_write(&c->state_lock);
return ret;
}
static const struct super_operations bch_super_operations = {
.alloc_inode = bch2_alloc_inode,
.destroy_inode = bch2_destroy_inode,
.write_inode = bch2_vfs_write_inode,
.evict_inode = bch2_evict_inode,
.sync_fs = bch2_sync_fs,
.statfs = bch2_statfs,
.show_devname = bch2_show_devname,
.show_options = bch2_show_options,
.remount_fs = bch2_remount,
.put_super = bch2_put_super,
.freeze_fs = bch2_freeze,
.unfreeze_fs = bch2_unfreeze,
};
static int bch2_set_super(struct super_block *s, void *data)
{
s->s_fs_info = data;
return 0;
}
static int bch2_noset_super(struct super_block *s, void *data)
{
return -EBUSY;
}
static int bch2_test_super(struct super_block *s, void *data)
{
struct bch_fs *c = s->s_fs_info;
struct bch_fs **devs = data;
unsigned i;
if (!c)
return false;
for (i = 0; devs[i]; i++)
if (c != devs[i])
return false;
return true;
}
static struct dentry *bch2_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
struct bch_fs *c;
struct bch_dev *ca;
struct super_block *sb;
struct inode *vinode;
struct bch_opts opts = bch2_opts_empty();
char **devs;
struct bch_fs **devs_to_fs = NULL;
unsigned i, nr_devs;
int ret;
opt_set(opts, read_only, (flags & SB_RDONLY) != 0);
ret = bch2_parse_mount_opts(NULL, &opts, data);
if (ret)
return ERR_PTR(ret);
if (!dev_name || strlen(dev_name) == 0)
return ERR_PTR(-EINVAL);
devs = split_devs(dev_name, &nr_devs);
if (!devs)
return ERR_PTR(-ENOMEM);
devs_to_fs = kcalloc(nr_devs + 1, sizeof(void *), GFP_KERNEL);
if (!devs_to_fs) {
sb = ERR_PTR(-ENOMEM);
goto got_sb;
}
for (i = 0; i < nr_devs; i++)
devs_to_fs[i] = bch2_path_to_fs(devs[i]);
sb = sget(fs_type, bch2_test_super, bch2_noset_super,
flags|SB_NOSEC, devs_to_fs);
if (!IS_ERR(sb))
goto got_sb;
c = bch2_fs_open(devs, nr_devs, opts);
if (IS_ERR(c)) {
sb = ERR_CAST(c);
goto got_sb;
}
/* Some options can't be parsed until after the fs is started: */
ret = bch2_parse_mount_opts(c, &opts, data);
if (ret) {
bch2_fs_stop(c);
sb = ERR_PTR(ret);
goto got_sb;
}
bch2_opts_apply(&c->opts, opts);
sb = sget(fs_type, NULL, bch2_set_super, flags|SB_NOSEC, c);
if (IS_ERR(sb))
bch2_fs_stop(c);
got_sb:
kfree(devs_to_fs);
kfree(devs[0]);
kfree(devs);
if (IS_ERR(sb)) {
ret = PTR_ERR(sb);
ret = bch2_err_class(ret);
return ERR_PTR(ret);
}
c = sb->s_fs_info;
if (sb->s_root) {
if ((flags ^ sb->s_flags) & SB_RDONLY) {
ret = -EBUSY;
goto err_put_super;
}
goto out;
}
sb->s_blocksize = block_bytes(c);
sb->s_blocksize_bits = ilog2(block_bytes(c));
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_op = &bch_super_operations;
sb->s_export_op = &bch_export_ops;
#ifdef CONFIG_BCACHEFS_QUOTA
sb->s_qcop = &bch2_quotactl_operations;
sb->s_quota_types = QTYPE_MASK_USR|QTYPE_MASK_GRP|QTYPE_MASK_PRJ;
#endif
sb->s_xattr = bch2_xattr_handlers;
sb->s_magic = BCACHEFS_STATFS_MAGIC;
sb->s_time_gran = c->sb.nsec_per_time_unit;
sb->s_time_min = div_s64(S64_MIN, c->sb.time_units_per_sec) + 1;
sb->s_time_max = div_s64(S64_MAX, c->sb.time_units_per_sec);
c->vfs_sb = sb;
strscpy(sb->s_id, c->name, sizeof(sb->s_id));
ret = super_setup_bdi(sb);
if (ret)
goto err_put_super;
sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
for_each_online_member(ca, c, i) {
struct block_device *bdev = ca->disk_sb.bdev;
/* XXX: create an anonymous device for multi device filesystems */
sb->s_bdev = bdev;
sb->s_dev = bdev->bd_dev;
percpu_ref_put(&ca->io_ref);
break;
}
c->dev = sb->s_dev;
#ifdef CONFIG_BCACHEFS_POSIX_ACL
if (c->opts.acl)
sb->s_flags |= SB_POSIXACL;
#endif
sb->s_shrink->seeks = 0;
vinode = bch2_vfs_inode_get(c, BCACHEFS_ROOT_SUBVOL_INUM);
ret = PTR_ERR_OR_ZERO(vinode);
if (ret) {
bch_err_msg(c, ret, "mounting: error getting root inode");
goto err_put_super;
}
sb->s_root = d_make_root(vinode);
if (!sb->s_root) {
bch_err(c, "error mounting: error allocating root dentry");
ret = -ENOMEM;
goto err_put_super;
}
sb->s_flags |= SB_ACTIVE;
out:
return dget(sb->s_root);
err_put_super:
deactivate_locked_super(sb);
return ERR_PTR(bch2_err_class(ret));
}
static void bch2_kill_sb(struct super_block *sb)
{
struct bch_fs *c = sb->s_fs_info;
generic_shutdown_super(sb);
bch2_fs_free(c);
}
static struct file_system_type bcache_fs_type = {
.owner = THIS_MODULE,
.name = "bcachefs",
.mount = bch2_mount,
.kill_sb = bch2_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("bcachefs");
void bch2_vfs_exit(void)
{
unregister_filesystem(&bcache_fs_type);
kmem_cache_destroy(bch2_inode_cache);
}
int __init bch2_vfs_init(void)
{
int ret = -ENOMEM;
bch2_inode_cache = KMEM_CACHE(bch_inode_info, SLAB_RECLAIM_ACCOUNT);
if (!bch2_inode_cache)
goto err;
ret = register_filesystem(&bcache_fs_type);
if (ret)
goto err;
return 0;
err:
bch2_vfs_exit();
return ret;
}
#endif /* NO_BCACHEFS_FS */
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