+++ /dev/null
-// 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, BCH_TRANS_COMMIT_no_enospc);
-
- /*
- * 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_subvol_is_ro_trans(trans, dir->ei_subvol) ?:
- 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_subvol_is_ro(c, dir->ei_subvol) ?:
- bch2_subvol_is_ro(c, inode->ei_subvol) ?:
- __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,
- BCH_TRANS_COMMIT_no_enospc,
- 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)
-{
- struct bch_inode_info *dir= to_bch_ei(vdir);
- struct bch_fs *c = dir->v.i_sb->s_fs_info;
-
- return bch2_subvol_is_ro(c, dir->ei_subvol) ?:
- __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);
-
- ret = bch2_subvol_is_ro_trans(trans, src_dir->ei_subvol) ?:
- bch2_subvol_is_ro_trans(trans, dst_dir->ei_subvol);
- if (ret)
- goto err;
-
- 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,
- BCH_TRANS_COMMIT_no_enospc);
-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);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- int ret;
-
- lockdep_assert_held(&inode->v.i_rwsem);
-
- ret = bch2_subvol_is_ro(c, inode->ei_subvol) ?:
- 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;
-
- if (!dir_emit_dots(file, ctx))
- return 0;
-
- int ret = bch2_readdir(c, inode_inum(inode), ctx);
-
- bch_err_fn(c, ret);
- return bch2_err_class(ret);
-}
-
-static int bch2_open(struct inode *vinode, struct file *file)
-{
- if (file->f_flags & (O_WRONLY|O_RDWR)) {
- struct bch_inode_info *inode = to_bch_ei(vinode);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
-
- int ret = bch2_subvol_is_ro(c, inode->ei_subvol);
- if (ret)
- return ret;
- }
-
- return generic_file_open(vinode, file);
-}
-
-static const struct file_operations bch_file_operations = {
- .open = bch2_open,
- .llseek = bch2_llseek,
- .read_iter = bch2_read_iter,
- .write_iter = bch2_write_iter,
- .mmap = bch2_mmap,
- .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_page = generic_error_remove_page,
-};
-
-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);
- int min_len;
-
- if (!S_ISDIR(inode->v.i_mode) && dir) {
- struct bcachefs_fid_with_parent *fid = (void *) fh;
-
- min_len = sizeof(*fid) / sizeof(u32);
- if (*len < min_len) {
- *len = min_len;
- return FILEID_INVALID;
- }
-
- fid->fid = bch2_inode_to_fid(inode);
- fid->dir = bch2_inode_to_fid(dir);
-
- *len = min_len;
- return FILEID_BCACHEFS_WITH_PARENT;
- } else {
- struct bcachefs_fid *fid = (void *) fh;
-
- min_len = sizeof(*fid) / sizeof(u32);
- if (*len < min_len) {
- *len = min_len;
- return FILEID_INVALID;
- }
- *fid = bch2_inode_to_fid(inode);
-
- *len = min_len;
- 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;
- 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 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;
-
- ret = bch2_parse_mount_opts(c, &opts, data);
- if (ret)
- goto err;
-
- opt_set(opts, read_only, (*flags & SB_RDONLY) != 0);
-
- 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;
- bool first = true;
-
- for_each_online_member(c, ca) {
- 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;
-
- if (test_bit(BCH_FS_emergency_ro, &c->flags))
- return 0;
-
- 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;
-}
-
-typedef DARRAY(struct bch_fs *) darray_fs;
-
-static int bch2_test_super(struct super_block *s, void *data)
-{
- struct bch_fs *c = s->s_fs_info;
- darray_fs *d = data;
-
- if (!c)
- return false;
-
- darray_for_each(*d, i)
- if (c != *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 super_block *sb;
- struct inode *vinode;
- struct bch_opts opts = bch2_opts_empty();
- 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);
-
- darray_str devs;
- ret = bch2_split_devs(dev_name, &devs);
- if (ret)
- return ERR_PTR(ret);
-
- darray_fs devs_to_fs = {};
- darray_for_each(devs, i) {
- ret = darray_push(&devs_to_fs, bch2_path_to_fs(*i));
- if (ret) {
- sb = ERR_PTR(ret);
- goto got_sb;
- }
- }
-
- 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.data, devs.nr, 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:
- darray_exit(&devs_to_fs);
- bch2_darray_str_exit(&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(c, ca) {
- 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);
- bch_err_msg(c, ret, "mounting: error getting root inode");
- if (ret)
- 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 */
projects / bcachefs-tools-debian / blobdiff