diff options
Diffstat (limited to 'fs/f2fs/namei.c')
| -rw-r--r-- | fs/f2fs/namei.c | 1400 |
1 files changed, 1400 insertions, 0 deletions
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c new file mode 100644 index 000000000..328cd20b1 --- /dev/null +++ b/fs/f2fs/namei.c @@ -0,0 +1,1400 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * fs/f2fs/namei.c + * + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + */ +#include <linux/fs.h> +#include <linux/f2fs_fs.h> +#include <linux/pagemap.h> +#include <linux/sched.h> +#include <linux/ctype.h> +#include <linux/random.h> +#include <linux/dcache.h> +#include <linux/namei.h> +#include <linux/quotaops.h> + +#include "f2fs.h" +#include "node.h" +#include "segment.h" +#include "xattr.h" +#include "acl.h" +#include <trace/events/f2fs.h> + +static inline int is_extension_exist(const unsigned char *s, const char *sub, + bool tmp_ext) +{ + size_t slen = strlen(s); + size_t sublen = strlen(sub); + int i; + + if (sublen == 1 && *sub == '*') + return 1; + + /* + * filename format of multimedia file should be defined as: + * "filename + '.' + extension + (optional: '.' + temp extension)". + */ + if (slen < sublen + 2) + return 0; + + if (!tmp_ext) { + /* file has no temp extension */ + if (s[slen - sublen - 1] != '.') + return 0; + return !strncasecmp(s + slen - sublen, sub, sublen); + } + + for (i = 1; i < slen - sublen; i++) { + if (s[i] != '.') + continue; + if (!strncasecmp(s + i + 1, sub, sublen)) + return 1; + } + + return 0; +} + +int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name, + bool hot, bool set) +{ + __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list; + int cold_count = le32_to_cpu(sbi->raw_super->extension_count); + int hot_count = sbi->raw_super->hot_ext_count; + int total_count = cold_count + hot_count; + int start, count; + int i; + + if (set) { + if (total_count == F2FS_MAX_EXTENSION) + return -EINVAL; + } else { + if (!hot && !cold_count) + return -EINVAL; + if (hot && !hot_count) + return -EINVAL; + } + + if (hot) { + start = cold_count; + count = total_count; + } else { + start = 0; + count = cold_count; + } + + for (i = start; i < count; i++) { + if (strcmp(name, extlist[i])) + continue; + + if (set) + return -EINVAL; + + memcpy(extlist[i], extlist[i + 1], + F2FS_EXTENSION_LEN * (total_count - i - 1)); + memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN); + if (hot) + sbi->raw_super->hot_ext_count = hot_count - 1; + else + sbi->raw_super->extension_count = + cpu_to_le32(cold_count - 1); + return 0; + } + + if (!set) + return -EINVAL; + + if (hot) { + memcpy(extlist[count], name, strlen(name)); + sbi->raw_super->hot_ext_count = hot_count + 1; + } else { + char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN]; + + memcpy(buf, &extlist[cold_count], + F2FS_EXTENSION_LEN * hot_count); + memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN); + memcpy(extlist[cold_count], name, strlen(name)); + memcpy(&extlist[cold_count + 1], buf, + F2FS_EXTENSION_LEN * hot_count); + sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1); + } + return 0; +} + +static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir, + struct inode *inode, const unsigned char *name) +{ + __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list; + unsigned char (*noext)[F2FS_EXTENSION_LEN] = + F2FS_OPTION(sbi).noextensions; + unsigned char (*ext)[F2FS_EXTENSION_LEN] = F2FS_OPTION(sbi).extensions; + unsigned char ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt; + unsigned char noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt; + int i, cold_count, hot_count; + + if (!f2fs_sb_has_compression(sbi)) + return; + + if (S_ISDIR(inode->i_mode)) + goto inherit_comp; + + /* This name comes only from normal files. */ + if (!name) + return; + + /* Don't compress hot files. */ + f2fs_down_read(&sbi->sb_lock); + cold_count = le32_to_cpu(sbi->raw_super->extension_count); + hot_count = sbi->raw_super->hot_ext_count; + for (i = cold_count; i < cold_count + hot_count; i++) + if (is_extension_exist(name, extlist[i], false)) + break; + f2fs_up_read(&sbi->sb_lock); + if (i < (cold_count + hot_count)) + return; + + /* Don't compress unallowed extension. */ + for (i = 0; i < noext_cnt; i++) + if (is_extension_exist(name, noext[i], false)) + return; + + /* Compress wanting extension. */ + for (i = 0; i < ext_cnt; i++) { + if (is_extension_exist(name, ext[i], false)) { + set_compress_context(inode); + return; + } + } +inherit_comp: + /* Inherit the {no-}compression flag in directory */ + if (F2FS_I(dir)->i_flags & F2FS_NOCOMP_FL) { + F2FS_I(inode)->i_flags |= F2FS_NOCOMP_FL; + f2fs_mark_inode_dirty_sync(inode, true); + } else if (F2FS_I(dir)->i_flags & F2FS_COMPR_FL) { + set_compress_context(inode); + } +} + +static struct inode *f2fs_new_inode(struct user_namespace *mnt_userns, + struct inode *dir, umode_t mode, + const char *name) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + nid_t ino; + struct inode *inode; + bool nid_free = false; + bool encrypt = false; + int xattr_size = 0; + int err; + + inode = new_inode(dir->i_sb); + if (!inode) + return ERR_PTR(-ENOMEM); + + if (!f2fs_alloc_nid(sbi, &ino)) { + err = -ENOSPC; + goto fail; + } + + nid_free = true; + + inode_init_owner(mnt_userns, inode, dir, mode); + + inode->i_ino = ino; + inode->i_blocks = 0; + inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); + F2FS_I(inode)->i_crtime = inode->i_mtime; + inode->i_generation = get_random_u32(); + + if (S_ISDIR(inode->i_mode)) + F2FS_I(inode)->i_current_depth = 1; + + err = insert_inode_locked(inode); + if (err) { + err = -EINVAL; + goto fail; + } + + if (f2fs_sb_has_project_quota(sbi) && + (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL)) + F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid; + else + F2FS_I(inode)->i_projid = make_kprojid(mnt_userns, + F2FS_DEF_PROJID); + + err = fscrypt_prepare_new_inode(dir, inode, &encrypt); + if (err) + goto fail_drop; + + err = f2fs_dquot_initialize(inode); + if (err) + goto fail_drop; + + set_inode_flag(inode, FI_NEW_INODE); + + if (encrypt) + f2fs_set_encrypted_inode(inode); + + if (f2fs_sb_has_extra_attr(sbi)) { + set_inode_flag(inode, FI_EXTRA_ATTR); + F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE; + } + + if (test_opt(sbi, INLINE_XATTR)) + set_inode_flag(inode, FI_INLINE_XATTR); + + if (f2fs_may_inline_dentry(inode)) + set_inode_flag(inode, FI_INLINE_DENTRY); + + if (f2fs_sb_has_flexible_inline_xattr(sbi)) { + f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode)); + if (f2fs_has_inline_xattr(inode)) + xattr_size = F2FS_OPTION(sbi).inline_xattr_size; + /* Otherwise, will be 0 */ + } else if (f2fs_has_inline_xattr(inode) || + f2fs_has_inline_dentry(inode)) { + xattr_size = DEFAULT_INLINE_XATTR_ADDRS; + } + F2FS_I(inode)->i_inline_xattr_size = xattr_size; + + F2FS_I(inode)->i_flags = + f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED); + + if (S_ISDIR(inode->i_mode)) + F2FS_I(inode)->i_flags |= F2FS_INDEX_FL; + + if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL) + set_inode_flag(inode, FI_PROJ_INHERIT); + + /* Check compression first. */ + set_compress_new_inode(sbi, dir, inode, name); + + /* Should enable inline_data after compression set */ + if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode)) + set_inode_flag(inode, FI_INLINE_DATA); + + stat_inc_inline_xattr(inode); + stat_inc_inline_inode(inode); + stat_inc_inline_dir(inode); + + f2fs_set_inode_flags(inode); + + f2fs_init_extent_tree(inode); + + trace_f2fs_new_inode(inode, 0); + return inode; + +fail: + trace_f2fs_new_inode(inode, err); + make_bad_inode(inode); + if (nid_free) + set_inode_flag(inode, FI_FREE_NID); + iput(inode); + return ERR_PTR(err); +fail_drop: + trace_f2fs_new_inode(inode, err); + dquot_drop(inode); + inode->i_flags |= S_NOQUOTA; + if (nid_free) + set_inode_flag(inode, FI_FREE_NID); + clear_nlink(inode); + unlock_new_inode(inode); + iput(inode); + return ERR_PTR(err); +} + +/* + * Set file's temperature for hot/cold data separation + */ +static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode, + const unsigned char *name) +{ + __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list; + int i, cold_count, hot_count; + + f2fs_down_read(&sbi->sb_lock); + + cold_count = le32_to_cpu(sbi->raw_super->extension_count); + hot_count = sbi->raw_super->hot_ext_count; + + for (i = 0; i < cold_count + hot_count; i++) { + if (is_extension_exist(name, extlist[i], true)) + break; + } + + f2fs_up_read(&sbi->sb_lock); + + if (i == cold_count + hot_count) + return; + + if (i < cold_count) + file_set_cold(inode); + else + file_set_hot(inode); +} + +static int f2fs_create(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode, bool excl) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct inode *inode; + nid_t ino = 0; + int err; + + if (unlikely(f2fs_cp_error(sbi))) + return -EIO; + if (!f2fs_is_checkpoint_ready(sbi)) + return -ENOSPC; + + err = f2fs_dquot_initialize(dir); + if (err) + return err; + + inode = f2fs_new_inode(mnt_userns, dir, mode, dentry->d_name.name); + if (IS_ERR(inode)) + return PTR_ERR(inode); + + if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) + set_file_temperature(sbi, inode, dentry->d_name.name); + + inode->i_op = &f2fs_file_inode_operations; + inode->i_fop = &f2fs_file_operations; + inode->i_mapping->a_ops = &f2fs_dblock_aops; + ino = inode->i_ino; + + f2fs_lock_op(sbi); + err = f2fs_add_link(dentry, inode); + if (err) + goto out; + f2fs_unlock_op(sbi); + + f2fs_alloc_nid_done(sbi, ino); + + d_instantiate_new(dentry, inode); + + if (IS_DIRSYNC(dir)) + f2fs_sync_fs(sbi->sb, 1); + + f2fs_balance_fs(sbi, true); + return 0; +out: + f2fs_handle_failed_inode(inode); + return err; +} + +static int f2fs_link(struct dentry *old_dentry, struct inode *dir, + struct dentry *dentry) +{ + struct inode *inode = d_inode(old_dentry); + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + int err; + + if (unlikely(f2fs_cp_error(sbi))) + return -EIO; + if (!f2fs_is_checkpoint_ready(sbi)) + return -ENOSPC; + + err = fscrypt_prepare_link(old_dentry, dir, dentry); + if (err) + return err; + + if (is_inode_flag_set(dir, FI_PROJ_INHERIT) && + (!projid_eq(F2FS_I(dir)->i_projid, + F2FS_I(old_dentry->d_inode)->i_projid))) + return -EXDEV; + + err = f2fs_dquot_initialize(dir); + if (err) + return err; + + f2fs_balance_fs(sbi, true); + + inode->i_ctime = current_time(inode); + ihold(inode); + + set_inode_flag(inode, FI_INC_LINK); + f2fs_lock_op(sbi); + err = f2fs_add_link(dentry, inode); + if (err) + goto out; + f2fs_unlock_op(sbi); + + d_instantiate(dentry, inode); + + if (IS_DIRSYNC(dir)) + f2fs_sync_fs(sbi->sb, 1); + return 0; +out: + clear_inode_flag(inode, FI_INC_LINK); + iput(inode); + f2fs_unlock_op(sbi); + return err; +} + +struct dentry *f2fs_get_parent(struct dentry *child) +{ + struct page *page; + unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot_name, &page); + + if (!ino) { + if (IS_ERR(page)) + return ERR_CAST(page); + return ERR_PTR(-ENOENT); + } + return d_obtain_alias(f2fs_iget(child->d_sb, ino)); +} + +static int __recover_dot_dentries(struct inode *dir, nid_t pino) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct qstr dot = QSTR_INIT(".", 1); + struct qstr dotdot = QSTR_INIT("..", 2); + struct f2fs_dir_entry *de; + struct page *page; + int err = 0; + + if (f2fs_readonly(sbi->sb)) { + f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint", + dir->i_ino, pino); + return 0; + } + + if (!S_ISDIR(dir->i_mode)) { + f2fs_err(sbi, "inconsistent inode status, skip recovering inline_dots inode (ino:%lu, i_mode:%u, pino:%u)", + dir->i_ino, dir->i_mode, pino); + set_sbi_flag(sbi, SBI_NEED_FSCK); + return -ENOTDIR; + } + + err = f2fs_dquot_initialize(dir); + if (err) + return err; + + f2fs_balance_fs(sbi, true); + + f2fs_lock_op(sbi); + + de = f2fs_find_entry(dir, &dot, &page); + if (de) { + f2fs_put_page(page, 0); + } else if (IS_ERR(page)) { + err = PTR_ERR(page); + goto out; + } else { + err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR); + if (err) + goto out; + } + + de = f2fs_find_entry(dir, &dotdot, &page); + if (de) + f2fs_put_page(page, 0); + else if (IS_ERR(page)) + err = PTR_ERR(page); + else + err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR); +out: + if (!err) + clear_inode_flag(dir, FI_INLINE_DOTS); + + f2fs_unlock_op(sbi); + return err; +} + +static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, + unsigned int flags) +{ + struct inode *inode = NULL; + struct f2fs_dir_entry *de; + struct page *page; + struct dentry *new; + nid_t ino = -1; + int err = 0; + unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir)); + struct f2fs_filename fname; + + trace_f2fs_lookup_start(dir, dentry, flags); + + if (dentry->d_name.len > F2FS_NAME_LEN) { + err = -ENAMETOOLONG; + goto out; + } + + err = f2fs_prepare_lookup(dir, dentry, &fname); + generic_set_encrypted_ci_d_ops(dentry); + if (err == -ENOENT) + goto out_splice; + if (err) + goto out; + de = __f2fs_find_entry(dir, &fname, &page); + f2fs_free_filename(&fname); + + if (!de) { + if (IS_ERR(page)) { + err = PTR_ERR(page); + goto out; + } + err = -ENOENT; + goto out_splice; + } + + ino = le32_to_cpu(de->ino); + f2fs_put_page(page, 0); + + inode = f2fs_iget(dir->i_sb, ino); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto out; + } + + if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) { + err = __recover_dot_dentries(dir, root_ino); + if (err) + goto out_iput; + } + + if (f2fs_has_inline_dots(inode)) { + err = __recover_dot_dentries(inode, dir->i_ino); + if (err) + goto out_iput; + } + if (IS_ENCRYPTED(dir) && + (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) && + !fscrypt_has_permitted_context(dir, inode)) { + f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu", + dir->i_ino, inode->i_ino); + err = -EPERM; + goto out_iput; + } +out_splice: +#if IS_ENABLED(CONFIG_UNICODE) + if (!inode && IS_CASEFOLDED(dir)) { + /* Eventually we want to call d_add_ci(dentry, NULL) + * for negative dentries in the encoding case as + * well. For now, prevent the negative dentry + * from being cached. + */ + trace_f2fs_lookup_end(dir, dentry, ino, err); + return NULL; + } +#endif + new = d_splice_alias(inode, dentry); + err = PTR_ERR_OR_ZERO(new); + trace_f2fs_lookup_end(dir, dentry, ino, !new ? -ENOENT : err); + return new; +out_iput: + iput(inode); +out: + trace_f2fs_lookup_end(dir, dentry, ino, err); + return ERR_PTR(err); +} + +static int f2fs_unlink(struct inode *dir, struct dentry *dentry) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct inode *inode = d_inode(dentry); + struct f2fs_dir_entry *de; + struct page *page; + int err; + + trace_f2fs_unlink_enter(dir, dentry); + + if (unlikely(f2fs_cp_error(sbi))) { + err = -EIO; + goto fail; + } + + err = f2fs_dquot_initialize(dir); + if (err) + goto fail; + err = f2fs_dquot_initialize(inode); + if (err) + goto fail; + + de = f2fs_find_entry(dir, &dentry->d_name, &page); + if (!de) { + if (IS_ERR(page)) + err = PTR_ERR(page); + goto fail; + } + + f2fs_balance_fs(sbi, true); + + f2fs_lock_op(sbi); + err = f2fs_acquire_orphan_inode(sbi); + if (err) { + f2fs_unlock_op(sbi); + f2fs_put_page(page, 0); + goto fail; + } + f2fs_delete_entry(de, page, dir, inode); +#if IS_ENABLED(CONFIG_UNICODE) + /* VFS negative dentries are incompatible with Encoding and + * Case-insensitiveness. Eventually we'll want avoid + * invalidating the dentries here, alongside with returning the + * negative dentries at f2fs_lookup(), when it is better + * supported by the VFS for the CI case. + */ + if (IS_CASEFOLDED(dir)) + d_invalidate(dentry); +#endif + f2fs_unlock_op(sbi); + + if (IS_DIRSYNC(dir)) + f2fs_sync_fs(sbi->sb, 1); +fail: + trace_f2fs_unlink_exit(inode, err); + return err; +} + +static const char *f2fs_get_link(struct dentry *dentry, + struct inode *inode, + struct delayed_call *done) +{ + const char *link = page_get_link(dentry, inode, done); + + if (!IS_ERR(link) && !*link) { + /* this is broken symlink case */ + do_delayed_call(done); + clear_delayed_call(done); + link = ERR_PTR(-ENOENT); + } + return link; +} + +static int f2fs_symlink(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, const char *symname) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct inode *inode; + size_t len = strlen(symname); + struct fscrypt_str disk_link; + int err; + + if (unlikely(f2fs_cp_error(sbi))) + return -EIO; + if (!f2fs_is_checkpoint_ready(sbi)) + return -ENOSPC; + + err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize, + &disk_link); + if (err) + return err; + + err = f2fs_dquot_initialize(dir); + if (err) + return err; + + inode = f2fs_new_inode(mnt_userns, dir, S_IFLNK | S_IRWXUGO, NULL); + if (IS_ERR(inode)) + return PTR_ERR(inode); + + if (IS_ENCRYPTED(inode)) + inode->i_op = &f2fs_encrypted_symlink_inode_operations; + else + inode->i_op = &f2fs_symlink_inode_operations; + inode_nohighmem(inode); + inode->i_mapping->a_ops = &f2fs_dblock_aops; + + f2fs_lock_op(sbi); + err = f2fs_add_link(dentry, inode); + if (err) + goto out_f2fs_handle_failed_inode; + f2fs_unlock_op(sbi); + f2fs_alloc_nid_done(sbi, inode->i_ino); + + err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link); + if (err) + goto err_out; + + err = page_symlink(inode, disk_link.name, disk_link.len); + +err_out: + d_instantiate_new(dentry, inode); + + /* + * Let's flush symlink data in order to avoid broken symlink as much as + * possible. Nevertheless, fsyncing is the best way, but there is no + * way to get a file descriptor in order to flush that. + * + * Note that, it needs to do dir->fsync to make this recoverable. + * If the symlink path is stored into inline_data, there is no + * performance regression. + */ + if (!err) { + filemap_write_and_wait_range(inode->i_mapping, 0, + disk_link.len - 1); + + if (IS_DIRSYNC(dir)) + f2fs_sync_fs(sbi->sb, 1); + } else { + f2fs_unlink(dir, dentry); + } + + f2fs_balance_fs(sbi, true); + goto out_free_encrypted_link; + +out_f2fs_handle_failed_inode: + f2fs_handle_failed_inode(inode); +out_free_encrypted_link: + if (disk_link.name != (unsigned char *)symname) + kfree(disk_link.name); + return err; +} + +static int f2fs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct inode *inode; + int err; + + if (unlikely(f2fs_cp_error(sbi))) + return -EIO; + + err = f2fs_dquot_initialize(dir); + if (err) + return err; + + inode = f2fs_new_inode(mnt_userns, dir, S_IFDIR | mode, NULL); + if (IS_ERR(inode)) + return PTR_ERR(inode); + + inode->i_op = &f2fs_dir_inode_operations; + inode->i_fop = &f2fs_dir_operations; + inode->i_mapping->a_ops = &f2fs_dblock_aops; + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); + + set_inode_flag(inode, FI_INC_LINK); + f2fs_lock_op(sbi); + err = f2fs_add_link(dentry, inode); + if (err) + goto out_fail; + f2fs_unlock_op(sbi); + + f2fs_alloc_nid_done(sbi, inode->i_ino); + + d_instantiate_new(dentry, inode); + + if (IS_DIRSYNC(dir)) + f2fs_sync_fs(sbi->sb, 1); + + f2fs_balance_fs(sbi, true); + return 0; + +out_fail: + clear_inode_flag(inode, FI_INC_LINK); + f2fs_handle_failed_inode(inode); + return err; +} + +static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) +{ + struct inode *inode = d_inode(dentry); + + if (f2fs_empty_dir(inode)) + return f2fs_unlink(dir, dentry); + return -ENOTEMPTY; +} + +static int f2fs_mknod(struct user_namespace *mnt_userns, struct inode *dir, + struct dentry *dentry, umode_t mode, dev_t rdev) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct inode *inode; + int err = 0; + + if (unlikely(f2fs_cp_error(sbi))) + return -EIO; + if (!f2fs_is_checkpoint_ready(sbi)) + return -ENOSPC; + + err = f2fs_dquot_initialize(dir); + if (err) + return err; + + inode = f2fs_new_inode(mnt_userns, dir, mode, NULL); + if (IS_ERR(inode)) + return PTR_ERR(inode); + + init_special_inode(inode, inode->i_mode, rdev); + inode->i_op = &f2fs_special_inode_operations; + + f2fs_lock_op(sbi); + err = f2fs_add_link(dentry, inode); + if (err) + goto out; + f2fs_unlock_op(sbi); + + f2fs_alloc_nid_done(sbi, inode->i_ino); + + d_instantiate_new(dentry, inode); + + if (IS_DIRSYNC(dir)) + f2fs_sync_fs(sbi->sb, 1); + + f2fs_balance_fs(sbi, true); + return 0; +out: + f2fs_handle_failed_inode(inode); + return err; +} + +static int __f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, + struct file *file, umode_t mode, bool is_whiteout, + struct inode **new_inode) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + struct inode *inode; + int err; + + err = f2fs_dquot_initialize(dir); + if (err) + return err; + + inode = f2fs_new_inode(mnt_userns, dir, mode, NULL); + if (IS_ERR(inode)) + return PTR_ERR(inode); + + if (is_whiteout) { + init_special_inode(inode, inode->i_mode, WHITEOUT_DEV); + inode->i_op = &f2fs_special_inode_operations; + } else { + inode->i_op = &f2fs_file_inode_operations; + inode->i_fop = &f2fs_file_operations; + inode->i_mapping->a_ops = &f2fs_dblock_aops; + } + + f2fs_lock_op(sbi); + err = f2fs_acquire_orphan_inode(sbi); + if (err) + goto out; + + err = f2fs_do_tmpfile(inode, dir); + if (err) + goto release_out; + + /* + * add this non-linked tmpfile to orphan list, in this way we could + * remove all unused data of tmpfile after abnormal power-off. + */ + f2fs_add_orphan_inode(inode); + f2fs_alloc_nid_done(sbi, inode->i_ino); + + if (is_whiteout) { + f2fs_i_links_write(inode, false); + + spin_lock(&inode->i_lock); + inode->i_state |= I_LINKABLE; + spin_unlock(&inode->i_lock); + } else { + if (file) + d_tmpfile(file, inode); + else + f2fs_i_links_write(inode, false); + } + /* link_count was changed by d_tmpfile as well. */ + f2fs_unlock_op(sbi); + unlock_new_inode(inode); + + if (new_inode) + *new_inode = inode; + + f2fs_balance_fs(sbi, true); + return 0; + +release_out: + f2fs_release_orphan_inode(sbi); +out: + f2fs_handle_failed_inode(inode); + return err; +} + +static int f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, + struct file *file, umode_t mode) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(dir); + int err; + + if (unlikely(f2fs_cp_error(sbi))) + return -EIO; + if (!f2fs_is_checkpoint_ready(sbi)) + return -ENOSPC; + + err = __f2fs_tmpfile(mnt_userns, dir, file, mode, false, NULL); + + return finish_open_simple(file, err); +} + +static int f2fs_create_whiteout(struct user_namespace *mnt_userns, + struct inode *dir, struct inode **whiteout) +{ + if (unlikely(f2fs_cp_error(F2FS_I_SB(dir)))) + return -EIO; + + return __f2fs_tmpfile(mnt_userns, dir, NULL, + S_IFCHR | WHITEOUT_MODE, true, whiteout); +} + +int f2fs_get_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, + struct inode **new_inode) +{ + return __f2fs_tmpfile(mnt_userns, dir, NULL, S_IFREG, false, new_inode); +} + +static int f2fs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, + struct dentry *old_dentry, struct inode *new_dir, + struct dentry *new_dentry, unsigned int flags) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); + struct inode *old_inode = d_inode(old_dentry); + struct inode *new_inode = d_inode(new_dentry); + struct inode *whiteout = NULL; + struct page *old_dir_page = NULL; + struct page *old_page, *new_page = NULL; + struct f2fs_dir_entry *old_dir_entry = NULL; + struct f2fs_dir_entry *old_entry; + struct f2fs_dir_entry *new_entry; + int err; + + if (unlikely(f2fs_cp_error(sbi))) + return -EIO; + if (!f2fs_is_checkpoint_ready(sbi)) + return -ENOSPC; + + if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && + (!projid_eq(F2FS_I(new_dir)->i_projid, + F2FS_I(old_dentry->d_inode)->i_projid))) + return -EXDEV; + + /* + * If new_inode is null, the below renaming flow will + * add a link in old_dir which can conver inline_dir. + * After then, if we failed to get the entry due to other + * reasons like ENOMEM, we had to remove the new entry. + * Instead of adding such the error handling routine, let's + * simply convert first here. + */ + if (old_dir == new_dir && !new_inode) { + err = f2fs_try_convert_inline_dir(old_dir, new_dentry); + if (err) + return err; + } + + if (flags & RENAME_WHITEOUT) { + err = f2fs_create_whiteout(mnt_userns, old_dir, &whiteout); + if (err) + return err; + } + + err = f2fs_dquot_initialize(old_dir); + if (err) + goto out; + + err = f2fs_dquot_initialize(new_dir); + if (err) + goto out; + + if (new_inode) { + err = f2fs_dquot_initialize(new_inode); + if (err) + goto out; + } + + err = -ENOENT; + old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); + if (!old_entry) { + if (IS_ERR(old_page)) + err = PTR_ERR(old_page); + goto out; + } + + if (S_ISDIR(old_inode->i_mode)) { + old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); + if (!old_dir_entry) { + if (IS_ERR(old_dir_page)) + err = PTR_ERR(old_dir_page); + goto out_old; + } + } + + if (new_inode) { + + err = -ENOTEMPTY; + if (old_dir_entry && !f2fs_empty_dir(new_inode)) + goto out_dir; + + err = -ENOENT; + new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, + &new_page); + if (!new_entry) { + if (IS_ERR(new_page)) + err = PTR_ERR(new_page); + goto out_dir; + } + + f2fs_balance_fs(sbi, true); + + f2fs_lock_op(sbi); + + err = f2fs_acquire_orphan_inode(sbi); + if (err) + goto put_out_dir; + + f2fs_set_link(new_dir, new_entry, new_page, old_inode); + new_page = NULL; + + new_inode->i_ctime = current_time(new_inode); + f2fs_down_write(&F2FS_I(new_inode)->i_sem); + if (old_dir_entry) + f2fs_i_links_write(new_inode, false); + f2fs_i_links_write(new_inode, false); + f2fs_up_write(&F2FS_I(new_inode)->i_sem); + + if (!new_inode->i_nlink) + f2fs_add_orphan_inode(new_inode); + else + f2fs_release_orphan_inode(sbi); + } else { + f2fs_balance_fs(sbi, true); + + f2fs_lock_op(sbi); + + err = f2fs_add_link(new_dentry, old_inode); + if (err) { + f2fs_unlock_op(sbi); + goto out_dir; + } + + if (old_dir_entry) + f2fs_i_links_write(new_dir, true); + } + + f2fs_down_write(&F2FS_I(old_inode)->i_sem); + if (!old_dir_entry || whiteout) + file_lost_pino(old_inode); + else + /* adjust dir's i_pino to pass fsck check */ + f2fs_i_pino_write(old_inode, new_dir->i_ino); + f2fs_up_write(&F2FS_I(old_inode)->i_sem); + + old_inode->i_ctime = current_time(old_inode); + f2fs_mark_inode_dirty_sync(old_inode, false); + + f2fs_delete_entry(old_entry, old_page, old_dir, NULL); + old_page = NULL; + + if (whiteout) { + set_inode_flag(whiteout, FI_INC_LINK); + err = f2fs_add_link(old_dentry, whiteout); + if (err) + goto put_out_dir; + + spin_lock(&whiteout->i_lock); + whiteout->i_state &= ~I_LINKABLE; + spin_unlock(&whiteout->i_lock); + + iput(whiteout); + } + + if (old_dir_entry) { + if (old_dir != new_dir) + f2fs_set_link(old_inode, old_dir_entry, + old_dir_page, new_dir); + else + f2fs_put_page(old_dir_page, 0); + f2fs_i_links_write(old_dir, false); + } + if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) { + f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO); + if (S_ISDIR(old_inode->i_mode)) + f2fs_add_ino_entry(sbi, old_inode->i_ino, + TRANS_DIR_INO); + } + + f2fs_unlock_op(sbi); + + if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) + f2fs_sync_fs(sbi->sb, 1); + + f2fs_update_time(sbi, REQ_TIME); + return 0; + +put_out_dir: + f2fs_unlock_op(sbi); + f2fs_put_page(new_page, 0); +out_dir: + if (old_dir_entry) + f2fs_put_page(old_dir_page, 0); +out_old: + f2fs_put_page(old_page, 0); +out: + iput(whiteout); + return err; +} + +static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) +{ + struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); + struct inode *old_inode = d_inode(old_dentry); + struct inode *new_inode = d_inode(new_dentry); + struct page *old_dir_page, *new_dir_page; + struct page *old_page, *new_page; + struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL; + struct f2fs_dir_entry *old_entry, *new_entry; + int old_nlink = 0, new_nlink = 0; + int err; + + if (unlikely(f2fs_cp_error(sbi))) + return -EIO; + if (!f2fs_is_checkpoint_ready(sbi)) + return -ENOSPC; + + if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && + !projid_eq(F2FS_I(new_dir)->i_projid, + F2FS_I(old_dentry->d_inode)->i_projid)) || + (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) && + !projid_eq(F2FS_I(old_dir)->i_projid, + F2FS_I(new_dentry->d_inode)->i_projid))) + return -EXDEV; + + err = f2fs_dquot_initialize(old_dir); + if (err) + goto out; + + err = f2fs_dquot_initialize(new_dir); + if (err) + goto out; + + err = -ENOENT; + old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); + if (!old_entry) { + if (IS_ERR(old_page)) + err = PTR_ERR(old_page); + goto out; + } + + new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page); + if (!new_entry) { + if (IS_ERR(new_page)) + err = PTR_ERR(new_page); + goto out_old; + } + + /* prepare for updating ".." directory entry info later */ + if (old_dir != new_dir) { + if (S_ISDIR(old_inode->i_mode)) { + old_dir_entry = f2fs_parent_dir(old_inode, + &old_dir_page); + if (!old_dir_entry) { + if (IS_ERR(old_dir_page)) + err = PTR_ERR(old_dir_page); + goto out_new; + } + } + + if (S_ISDIR(new_inode->i_mode)) { + new_dir_entry = f2fs_parent_dir(new_inode, + &new_dir_page); + if (!new_dir_entry) { + if (IS_ERR(new_dir_page)) + err = PTR_ERR(new_dir_page); + goto out_old_dir; + } + } + } + + /* + * If cross rename between file and directory those are not + * in the same directory, we will inc nlink of file's parent + * later, so we should check upper boundary of its nlink. + */ + if ((!old_dir_entry || !new_dir_entry) && + old_dir_entry != new_dir_entry) { + old_nlink = old_dir_entry ? -1 : 1; + new_nlink = -old_nlink; + err = -EMLINK; + if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) || + (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX)) + goto out_new_dir; + } + + f2fs_balance_fs(sbi, true); + + f2fs_lock_op(sbi); + + /* update ".." directory entry info of old dentry */ + if (old_dir_entry) + f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); + + /* update ".." directory entry info of new dentry */ + if (new_dir_entry) + f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir); + + /* update directory entry info of old dir inode */ + f2fs_set_link(old_dir, old_entry, old_page, new_inode); + + f2fs_down_write(&F2FS_I(old_inode)->i_sem); + if (!old_dir_entry) + file_lost_pino(old_inode); + else + /* adjust dir's i_pino to pass fsck check */ + f2fs_i_pino_write(old_inode, new_dir->i_ino); + f2fs_up_write(&F2FS_I(old_inode)->i_sem); + + old_dir->i_ctime = current_time(old_dir); + if (old_nlink) { + f2fs_down_write(&F2FS_I(old_dir)->i_sem); + f2fs_i_links_write(old_dir, old_nlink > 0); + f2fs_up_write(&F2FS_I(old_dir)->i_sem); + } + f2fs_mark_inode_dirty_sync(old_dir, false); + + /* update directory entry info of new dir inode */ + f2fs_set_link(new_dir, new_entry, new_page, old_inode); + + f2fs_down_write(&F2FS_I(new_inode)->i_sem); + if (!new_dir_entry) + file_lost_pino(new_inode); + else + /* adjust dir's i_pino to pass fsck check */ + f2fs_i_pino_write(new_inode, old_dir->i_ino); + f2fs_up_write(&F2FS_I(new_inode)->i_sem); + + new_dir->i_ctime = current_time(new_dir); + if (new_nlink) { + f2fs_down_write(&F2FS_I(new_dir)->i_sem); + f2fs_i_links_write(new_dir, new_nlink > 0); + f2fs_up_write(&F2FS_I(new_dir)->i_sem); + } + f2fs_mark_inode_dirty_sync(new_dir, false); + + if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) { + f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO); + f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO); + } + + f2fs_unlock_op(sbi); + + if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) + f2fs_sync_fs(sbi->sb, 1); + + f2fs_update_time(sbi, REQ_TIME); + return 0; +out_new_dir: + if (new_dir_entry) { + f2fs_put_page(new_dir_page, 0); + } +out_old_dir: + if (old_dir_entry) { + f2fs_put_page(old_dir_page, 0); + } +out_new: + f2fs_put_page(new_page, 0); +out_old: + f2fs_put_page(old_page, 0); +out: + return err; +} + +static int f2fs_rename2(struct user_namespace *mnt_userns, + struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry, + unsigned int flags) +{ + int err; + + if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) + return -EINVAL; + + err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, + flags); + if (err) + return err; + + if (flags & RENAME_EXCHANGE) { + return f2fs_cross_rename(old_dir, old_dentry, + new_dir, new_dentry); + } + /* + * VFS has already handled the new dentry existence case, + * here, we just deal with "RENAME_NOREPLACE" as regular rename. + */ + return f2fs_rename(mnt_userns, old_dir, old_dentry, + new_dir, new_dentry, flags); +} + +static const char *f2fs_encrypted_get_link(struct dentry *dentry, + struct inode *inode, + struct delayed_call *done) +{ + struct page *page; + const char *target; + + if (!dentry) + return ERR_PTR(-ECHILD); + + page = read_mapping_page(inode->i_mapping, 0, NULL); + if (IS_ERR(page)) + return ERR_CAST(page); + + target = fscrypt_get_symlink(inode, page_address(page), + inode->i_sb->s_blocksize, done); + put_page(page); + return target; +} + +static int f2fs_encrypted_symlink_getattr(struct user_namespace *mnt_userns, + const struct path *path, + struct kstat *stat, u32 request_mask, + unsigned int query_flags) +{ + f2fs_getattr(mnt_userns, path, stat, request_mask, query_flags); + + return fscrypt_symlink_getattr(path, stat); +} + +const struct inode_operations f2fs_encrypted_symlink_inode_operations = { + .get_link = f2fs_encrypted_get_link, + .getattr = f2fs_encrypted_symlink_getattr, + .setattr = f2fs_setattr, + .listxattr = f2fs_listxattr, +}; + +const struct inode_operations f2fs_dir_inode_operations = { + .create = f2fs_create, + .lookup = f2fs_lookup, + .link = f2fs_link, + .unlink = f2fs_unlink, + .symlink = f2fs_symlink, + .mkdir = f2fs_mkdir, + .rmdir = f2fs_rmdir, + .mknod = f2fs_mknod, + .rename = f2fs_rename2, + .tmpfile = f2fs_tmpfile, + .getattr = f2fs_getattr, + .setattr = f2fs_setattr, + .get_acl = f2fs_get_acl, + .set_acl = f2fs_set_acl, + .listxattr = f2fs_listxattr, + .fiemap = f2fs_fiemap, + .fileattr_get = f2fs_fileattr_get, + .fileattr_set = f2fs_fileattr_set, +}; + +const struct inode_operations f2fs_symlink_inode_operations = { + .get_link = f2fs_get_link, + .getattr = f2fs_getattr, + .setattr = f2fs_setattr, + .listxattr = f2fs_listxattr, +}; + +const struct inode_operations f2fs_special_inode_operations = { + .getattr = f2fs_getattr, + .setattr = f2fs_setattr, + .get_acl = f2fs_get_acl, + .set_acl = f2fs_set_acl, + .listxattr = f2fs_listxattr, +}; |