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Diffstat (limited to 'fs/f2fs/namei.c')
-rw-r--r--fs/f2fs/namei.c390
1 files changed, 300 insertions, 90 deletions
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 658e8079aaf9..fdbae21ee8fb 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -56,11 +56,18 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
goto out;
}
- if (f2fs_may_inline(inode))
+ /* If the directory encrypted, then we should encrypt the inode. */
+ if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
+ f2fs_set_encrypted_inode(inode);
+
+ if (f2fs_may_inline_data(inode))
set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
- if (test_opt(sbi, INLINE_DENTRY) && S_ISDIR(inode->i_mode))
+ if (f2fs_may_inline_dentry(inode))
set_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
+ stat_inc_inline_inode(inode);
+ stat_inc_inline_dir(inode);
+
trace_f2fs_new_inode(inode, 0);
mark_inode_dirty(inode);
return inode;
@@ -136,7 +143,6 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
alloc_nid_done(sbi, ino);
- stat_inc_inline_inode(inode);
d_instantiate(dentry, inode);
unlock_new_inode(inode);
@@ -155,6 +161,10 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
int err;
+ if (f2fs_encrypted_inode(dir) &&
+ !f2fs_is_child_context_consistent_with_parent(dir, inode))
+ return -EPERM;
+
f2fs_balance_fs(sbi);
inode->i_ctime = CURRENT_TIME;
@@ -232,32 +242,34 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
struct inode *inode = NULL;
struct f2fs_dir_entry *de;
struct page *page;
+ nid_t ino;
+ int err = 0;
if (dentry->d_name.len > F2FS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
de = f2fs_find_entry(dir, &dentry->d_name, &page);
- if (de) {
- nid_t ino = le32_to_cpu(de->ino);
- f2fs_dentry_kunmap(dir, page);
- f2fs_put_page(page, 0);
+ if (!de)
+ return d_splice_alias(inode, dentry);
- inode = f2fs_iget(dir->i_sb, ino);
- if (IS_ERR(inode))
- return ERR_CAST(inode);
+ ino = le32_to_cpu(de->ino);
+ f2fs_dentry_kunmap(dir, page);
+ f2fs_put_page(page, 0);
- if (f2fs_has_inline_dots(inode)) {
- int err;
+ inode = f2fs_iget(dir->i_sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
- err = __recover_dot_dentries(inode, dir->i_ino);
- if (err) {
- iget_failed(inode);
- return ERR_PTR(err);
- }
- }
+ if (f2fs_has_inline_dots(inode)) {
+ err = __recover_dot_dentries(inode, dir->i_ino);
+ if (err)
+ goto err_out;
}
-
return d_splice_alias(inode, dentry);
+
+err_out:
+ iget_failed(inode);
+ return ERR_PTR(err);
}
static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
@@ -296,19 +308,15 @@ fail:
return err;
}
-static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
{
- struct page *page = page_follow_link_light(dentry, nd);
-
- if (IS_ERR_OR_NULL(page))
- return page;
-
- /* this is broken symlink case */
- if (*nd_get_link(nd) == 0) {
- page_put_link(dentry, nd, page);
- return ERR_PTR(-ENOENT);
+ const char *link = page_follow_link_light(dentry, cookie);
+ if (!IS_ERR(link) && !*link) {
+ /* this is broken symlink case */
+ page_put_link(NULL, *cookie);
+ link = ERR_PTR(-ENOENT);
}
- return page;
+ return link;
}
static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
@@ -316,16 +324,26 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct inode *inode;
- size_t symlen = strlen(symname) + 1;
+ size_t len = strlen(symname);
+ size_t p_len;
+ char *p_str;
+ struct f2fs_str disk_link = FSTR_INIT(NULL, 0);
+ struct f2fs_encrypted_symlink_data *sd = NULL;
int err;
+ if (len > dir->i_sb->s_blocksize)
+ return -ENAMETOOLONG;
+
f2fs_balance_fs(sbi);
inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
if (IS_ERR(inode))
return PTR_ERR(inode);
- inode->i_op = &f2fs_symlink_inode_operations;
+ if (f2fs_encrypted_inode(inode))
+ inode->i_op = &f2fs_encrypted_symlink_inode_operations;
+ else
+ inode->i_op = &f2fs_symlink_inode_operations;
inode->i_mapping->a_ops = &f2fs_dblock_aops;
f2fs_lock_op(sbi);
@@ -333,10 +351,46 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
if (err)
goto out;
f2fs_unlock_op(sbi);
-
- err = page_symlink(inode, symname, symlen);
alloc_nid_done(sbi, inode->i_ino);
+ if (f2fs_encrypted_inode(dir)) {
+ struct qstr istr = QSTR_INIT(symname, len);
+
+ err = f2fs_get_encryption_info(inode);
+ if (err)
+ goto err_out;
+
+ err = f2fs_fname_crypto_alloc_buffer(inode, len, &disk_link);
+ if (err)
+ goto err_out;
+
+ err = f2fs_fname_usr_to_disk(inode, &istr, &disk_link);
+ if (err < 0)
+ goto err_out;
+
+ p_len = encrypted_symlink_data_len(disk_link.len) + 1;
+
+ if (p_len > dir->i_sb->s_blocksize) {
+ err = -ENAMETOOLONG;
+ goto err_out;
+ }
+
+ sd = kzalloc(p_len, GFP_NOFS);
+ if (!sd) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+ memcpy(sd->encrypted_path, disk_link.name, disk_link.len);
+ sd->len = cpu_to_le16(disk_link.len);
+ p_str = (char *)sd;
+ } else {
+ p_len = len + 1;
+ p_str = (char *)symname;
+ }
+
+ err = page_symlink(inode, p_str, p_len);
+
+err_out:
d_instantiate(dentry, inode);
unlock_new_inode(inode);
@@ -349,10 +403,14 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
* If the symlink path is stored into inline_data, there is no
* performance regression.
*/
- filemap_write_and_wait_range(inode->i_mapping, 0, symlen - 1);
+ if (!err)
+ filemap_write_and_wait_range(inode->i_mapping, 0, p_len - 1);
if (IS_DIRSYNC(dir))
f2fs_sync_fs(sbi->sb, 1);
+
+ kfree(sd);
+ f2fs_fname_crypto_free_buffer(&disk_link);
return err;
out:
handle_failed_inode(inode);
@@ -383,7 +441,6 @@ static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
goto out_fail;
f2fs_unlock_op(sbi);
- stat_inc_inline_dir(inode);
alloc_nid_done(sbi, inode->i_ino);
d_instantiate(dentry, inode);
@@ -445,19 +502,101 @@ out:
return err;
}
+static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
+ umode_t mode, struct inode **whiteout)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
+ struct inode *inode;
+ int err;
+
+ if (!whiteout)
+ f2fs_balance_fs(sbi);
+
+ inode = f2fs_new_inode(dir, mode);
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+
+ if (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 = 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.
+ */
+ add_orphan_inode(sbi, inode->i_ino);
+ f2fs_unlock_op(sbi);
+
+ alloc_nid_done(sbi, inode->i_ino);
+
+ if (whiteout) {
+ inode_dec_link_count(inode);
+ *whiteout = inode;
+ } else {
+ d_tmpfile(dentry, inode);
+ }
+ unlock_new_inode(inode);
+ return 0;
+
+release_out:
+ release_orphan_inode(sbi);
+out:
+ handle_failed_inode(inode);
+ return err;
+}
+
+static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ if (f2fs_encrypted_inode(dir)) {
+ int err = f2fs_get_encryption_info(dir);
+ if (err)
+ return err;
+ }
+
+ return __f2fs_tmpfile(dir, dentry, mode, NULL);
+}
+
+static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
+{
+ return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
+}
+
static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_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;
- struct page *old_page, *new_page;
+ 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 = -ENOENT;
+ if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
+ !f2fs_is_child_context_consistent_with_parent(new_dir,
+ old_inode)) {
+ err = -EPERM;
+ goto out;
+ }
+
f2fs_balance_fs(sbi);
old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
@@ -471,17 +610,23 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
goto out_old;
}
+ if (flags & RENAME_WHITEOUT) {
+ err = f2fs_create_whiteout(old_dir, &whiteout);
+ if (err)
+ goto out_dir;
+ }
+
if (new_inode) {
err = -ENOTEMPTY;
if (old_dir_entry && !f2fs_empty_dir(new_inode))
- goto out_dir;
+ goto out_whiteout;
err = -ENOENT;
new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
&new_page);
if (!new_entry)
- goto out_dir;
+ goto out_whiteout;
f2fs_lock_op(sbi);
@@ -489,7 +634,8 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (err)
goto put_out_dir;
- if (update_dent_inode(old_inode, &new_dentry->d_name)) {
+ if (update_dent_inode(old_inode, new_inode,
+ &new_dentry->d_name)) {
release_orphan_inode(sbi);
goto put_out_dir;
}
@@ -518,7 +664,7 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
err = f2fs_add_link(new_dentry, old_inode);
if (err) {
f2fs_unlock_op(sbi);
- goto out_dir;
+ goto out_whiteout;
}
if (old_dir_entry) {
@@ -529,6 +675,8 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
down_write(&F2FS_I(old_inode)->i_sem);
file_lost_pino(old_inode);
+ if (new_inode && file_enc_name(new_inode))
+ file_set_enc_name(old_inode);
up_write(&F2FS_I(old_inode)->i_sem);
old_inode->i_ctime = CURRENT_TIME;
@@ -536,8 +684,18 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
+ if (whiteout) {
+ whiteout->i_state |= I_LINKABLE;
+ set_inode_flag(F2FS_I(whiteout), FI_INC_LINK);
+ err = f2fs_add_link(old_dentry, whiteout);
+ if (err)
+ goto put_out_dir;
+ whiteout->i_state &= ~I_LINKABLE;
+ iput(whiteout);
+ }
+
if (old_dir_entry) {
- if (old_dir != new_dir) {
+ if (old_dir != new_dir && !whiteout) {
f2fs_set_link(old_inode, old_dir_entry,
old_dir_page, new_dir);
update_inode_page(old_inode);
@@ -558,8 +716,13 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
put_out_dir:
f2fs_unlock_op(sbi);
- f2fs_dentry_kunmap(new_dir, new_page);
- f2fs_put_page(new_page, 0);
+ if (new_page) {
+ f2fs_dentry_kunmap(new_dir, new_page);
+ f2fs_put_page(new_page, 0);
+ }
+out_whiteout:
+ if (whiteout)
+ iput(whiteout);
out_dir:
if (old_dir_entry) {
f2fs_dentry_kunmap(old_inode, old_dir_page);
@@ -585,6 +748,14 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
int old_nlink = 0, new_nlink = 0;
int err = -ENOENT;
+ if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
+ (old_dir != new_dir) &&
+ (!f2fs_is_child_context_consistent_with_parent(new_dir,
+ old_inode) ||
+ !f2fs_is_child_context_consistent_with_parent(old_dir,
+ new_inode)))
+ return -EPERM;
+
f2fs_balance_fs(sbi);
old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
@@ -631,13 +802,17 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
f2fs_lock_op(sbi);
- err = update_dent_inode(old_inode, &new_dentry->d_name);
+ err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
if (err)
goto out_unlock;
+ if (file_enc_name(new_inode))
+ file_set_enc_name(old_inode);
- err = update_dent_inode(new_inode, &old_dentry->d_name);
+ err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
if (err)
goto out_undo;
+ if (file_enc_name(old_inode))
+ file_set_enc_name(new_inode);
/* update ".." directory entry info of old dentry */
if (old_dir_entry)
@@ -695,8 +870,11 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
f2fs_sync_fs(sbi->sb, 1);
return 0;
out_undo:
- /* Still we may fail to recover name info of f2fs_inode here */
- update_dent_inode(old_inode, &old_dentry->d_name);
+ /*
+ * Still we may fail to recover name info of f2fs_inode here
+ * Drop it, once its name is set as encrypted
+ */
+ update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
out_unlock:
f2fs_unlock_op(sbi);
out_new_dir:
@@ -723,7 +901,7 @@ static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
- if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+ if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
return -EINVAL;
if (flags & RENAME_EXCHANGE) {
@@ -734,53 +912,85 @@ static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
* VFS has already handled the new dentry existence case,
* here, we just deal with "RENAME_NOREPLACE" as regular rename.
*/
- return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry);
+ return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
}
-static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
+#ifdef CONFIG_F2FS_FS_ENCRYPTION
+static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
{
- struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
- struct inode *inode;
- int err;
-
- inode = f2fs_new_inode(dir, mode);
- if (IS_ERR(inode))
- return PTR_ERR(inode);
-
- 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 = 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.
- */
- add_orphan_inode(sbi, inode->i_ino);
- f2fs_unlock_op(sbi);
-
- alloc_nid_done(sbi, inode->i_ino);
+ struct page *cpage = NULL;
+ char *caddr, *paddr = NULL;
+ struct f2fs_str cstr;
+ struct f2fs_str pstr = FSTR_INIT(NULL, 0);
+ struct inode *inode = d_inode(dentry);
+ struct f2fs_encrypted_symlink_data *sd;
+ loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
+ u32 max_size = inode->i_sb->s_blocksize;
+ int res;
+
+ res = f2fs_get_encryption_info(inode);
+ if (res)
+ return ERR_PTR(res);
+
+ cpage = read_mapping_page(inode->i_mapping, 0, NULL);
+ if (IS_ERR(cpage))
+ return ERR_CAST(cpage);
+ caddr = kmap(cpage);
+ caddr[size] = 0;
+
+ /* Symlink is encrypted */
+ sd = (struct f2fs_encrypted_symlink_data *)caddr;
+ cstr.name = sd->encrypted_path;
+ cstr.len = le16_to_cpu(sd->len);
- stat_inc_inline_inode(inode);
- d_tmpfile(dentry, inode);
- unlock_new_inode(inode);
- return 0;
+ /* this is broken symlink case */
+ if (cstr.name[0] == 0 && cstr.len == 0) {
+ res = -ENOENT;
+ goto errout;
+ }
-release_out:
- release_orphan_inode(sbi);
-out:
- handle_failed_inode(inode);
- return err;
+ if ((cstr.len + sizeof(struct f2fs_encrypted_symlink_data) - 1) >
+ max_size) {
+ /* Symlink data on the disk is corrupted */
+ res = -EIO;
+ goto errout;
+ }
+ res = f2fs_fname_crypto_alloc_buffer(inode, cstr.len, &pstr);
+ if (res)
+ goto errout;
+
+ res = f2fs_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
+ if (res < 0)
+ goto errout;
+
+ paddr = pstr.name;
+
+ /* Null-terminate the name */
+ paddr[res] = '\0';
+
+ kunmap(cpage);
+ page_cache_release(cpage);
+ return *cookie = paddr;
+errout:
+ f2fs_fname_crypto_free_buffer(&pstr);
+ kunmap(cpage);
+ page_cache_release(cpage);
+ return ERR_PTR(res);
}
+const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
+ .readlink = generic_readlink,
+ .follow_link = f2fs_encrypted_follow_link,
+ .put_link = kfree_put_link,
+ .getattr = f2fs_getattr,
+ .setattr = f2fs_setattr,
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
+ .listxattr = f2fs_listxattr,
+ .removexattr = generic_removexattr,
+};
+#endif
+
const struct inode_operations f2fs_dir_inode_operations = {
.create = f2fs_create,
.lookup = f2fs_lookup,
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 15:12:01 +0000