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authorChristoph Hellwig <hch@lst.de>2023-01-18 18:30:23 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2023-01-19 19:26:34 -0500
commit2d1a9d599b3ed9b9c58f64b8b71b5b9d770ceacf (patch)
tree05fbead28b1adb47e8dcc4535b6b1492bef59b97 /fs/minix
parentb61d15d5ff67c07907c194d4354ec0c35bc657d1 (diff)
downloadlwn-2d1a9d599b3ed9b9c58f64b8b71b5b9d770ceacf.tar.gz
lwn-2d1a9d599b3ed9b9c58f64b8b71b5b9d770ceacf.zip
minix: fix error handling in minix_set_link
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>
Diffstat (limited to 'fs/minix')
-rw-r--r--fs/minix/dir.c22
-rw-r--r--fs/minix/minix.h3
-rw-r--r--fs/minix/namei.c10
3 files changed, 20 insertions, 15 deletions
diff --git a/fs/minix/dir.c b/fs/minix/dir.c
index 242e179aa1fb..34c1cdb5dc7d 100644
--- a/fs/minix/dir.c
+++ b/fs/minix/dir.c
@@ -410,8 +410,8 @@ not_empty:
}
/* Releases the page */
-void minix_set_link(struct minix_dir_entry *de, struct page *page,
- struct inode *inode)
+int minix_set_link(struct minix_dir_entry *de, struct page *page,
+ struct inode *inode)
{
struct inode *dir = page->mapping->host;
struct minix_sb_info *sbi = minix_sb(dir->i_sb);
@@ -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 (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 {
+ 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);
+ 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)
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index 7158a68bdc63..65c19e078ec4 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -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*);
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 7dc481418871..382ead96bf54 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -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);
@@ -233,8 +234,9 @@ 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);
- inode_dec_link_count(old_dir);
+ err = minix_set_link(dir_de, dir_page, new_dir);
+ if (!err)
+ inode_dec_link_count(old_dir);
}
out_dir:
if (dir_de) {