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minix: fix error handling in minix_set_link

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If minix_prepare_chunk fails, updating c/mtime and marking the
dir inode dirty is wrong, as the inode hasn't been modified.  Also
propagate the error to the caller.

Note that this moves the dir_put_page call later, but that matches
other uses of this helper in the directory code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2023-01-18 18:30:23 +01:00 committed by Al Viro
parent b61d15d5ff
commit 2d1a9d599b
3 changed files with 20 additions and 15 deletions
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14
fs/minix/dir.c
View File

@ -410,7 +410,7 @@ not_empty:
}
/* Releases the page */
void minix_set_link(struct minix_dir_entry *de, struct page *page,
int minix_set_link(struct minix_dir_entry *de, struct page *page,
struct inode *inode)
{
struct inode *dir = page->mapping->host;
@ -420,19 +420,21 @@ void minix_set_link(struct minix_dir_entry *de, struct page *page,
int err;
lock_page(page);
err = minix_prepare_chunk(page, pos, sbi->s_dirsize);
if (err == 0) {
if (err) {
unlock_page(page);
return err;
}
if (sbi->s_version == MINIX_V3)
((minix3_dirent *)de)->inode = inode->i_ino;
else
de->inode = inode->i_ino;
err = dir_commit_chunk(page, pos, sbi->s_dirsize);
} else {
unlock_page(page);
}
if (err)
return err;
dir->i_mtime = dir->i_ctime = current_time(dir);
mark_inode_dirty(dir);
return 0;
}
struct minix_dir_entry * minix_dotdot (struct inode *dir, struct page **p)

3
fs/minix/minix.h
View File

@ -69,7 +69,8 @@ extern int minix_add_link(struct dentry*, struct inode*);
extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
extern int minix_make_empty(struct inode*, struct inode*);
extern int minix_empty_dir(struct inode*);
extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
int minix_set_link(struct minix_dir_entry *de, struct page *page,
struct inode *inode);
extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
extern ino_t minix_inode_by_name(struct dentry*);

8
fs/minix/namei.c
View File

@ -213,10 +213,11 @@ static int minix_rename(struct user_namespace *mnt_userns,
new_de = minix_find_entry(new_dentry, &new_page);
if (!new_de)
goto out_dir;
err = 0;
minix_set_link(new_de, new_page, old_inode);
err = minix_set_link(new_de, new_page, old_inode);
kunmap(new_page);
put_page(new_page);
if (err)
goto out_dir;
new_inode->i_ctime = current_time(new_inode);
if (dir_de)
drop_nlink(new_inode);
@ -233,7 +234,8 @@ static int minix_rename(struct user_namespace *mnt_userns,
mark_inode_dirty(old_inode);
if (dir_de) {
minix_set_link(dir_de, dir_page, new_dir);
err = minix_set_link(dir_de, dir_page, new_dir);
if (!err)
inode_dec_link_count(old_dir);
}
out_dir: