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authorMiklos Szeredi <mszeredi@redhat.com>2021-10-22 18:03:02 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2021-10-22 18:03:02 +0300
commitcefd1b83275d4c587bdeb2fe7aed07908642f875 (patch)
treedcb2f16e4bf7edf9ace171187cbb452ece64947e /fs/fuse/dir.c
parent84840efc3c0f225ee5597e0a013e9da03afc73c6 (diff)
downloadlinux-cefd1b83275d4c587bdeb2fe7aed07908642f875.tar.xz
fuse: decrement nlink on overwriting rename
Rename didn't decrement/clear nlink on overwritten target inode. Create a common helper fuse_entry_unlinked() that handles this for unlink, rmdir and rename. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/dir.c')
-rw-r--r--fs/fuse/dir.c49
1 files changed, 27 insertions, 22 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 1b345ab48fd0..dd83b5d43fe5 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -755,6 +755,29 @@ void fuse_update_ctime(struct inode *inode)
}
}
+static void fuse_entry_unlinked(struct dentry *entry)
+{
+ struct inode *inode = d_inode(entry);
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_inode *fi = get_fuse_inode(inode);
+
+ spin_lock(&fi->lock);
+ fi->attr_version = atomic64_inc_return(&fc->attr_version);
+ /*
+ * If i_nlink == 0 then unlink doesn't make sense, yet this can
+ * happen if userspace filesystem is careless. It would be
+ * difficult to enforce correct nlink usage so just ignore this
+ * condition here
+ */
+ if (S_ISDIR(inode->i_mode))
+ clear_nlink(inode);
+ else if (inode->i_nlink > 0)
+ drop_nlink(inode);
+ spin_unlock(&fi->lock);
+ fuse_invalidate_entry_cache(entry);
+ fuse_update_ctime(inode);
+}
+
static int fuse_unlink(struct inode *dir, struct dentry *entry)
{
int err;
@@ -771,23 +794,8 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
args.in_args[0].value = entry->d_name.name;
err = fuse_simple_request(fm, &args);
if (!err) {
- struct inode *inode = d_inode(entry);
- struct fuse_inode *fi = get_fuse_inode(inode);
-
- spin_lock(&fi->lock);
- fi->attr_version = atomic64_inc_return(&fm->fc->attr_version);
- /*
- * If i_nlink == 0 then unlink doesn't make sense, yet this can
- * happen if userspace filesystem is careless. It would be
- * difficult to enforce correct nlink usage so just ignore this
- * condition here
- */
- if (inode->i_nlink > 0)
- drop_nlink(inode);
- spin_unlock(&fi->lock);
fuse_dir_changed(dir);
- fuse_invalidate_entry_cache(entry);
- fuse_update_ctime(inode);
+ fuse_entry_unlinked(entry);
} else if (err == -EINTR)
fuse_invalidate_entry(entry);
return err;
@@ -809,9 +817,8 @@ static int fuse_rmdir(struct inode *dir, struct dentry *entry)
args.in_args[0].value = entry->d_name.name;
err = fuse_simple_request(fm, &args);
if (!err) {
- clear_nlink(d_inode(entry));
fuse_dir_changed(dir);
- fuse_invalidate_entry_cache(entry);
+ fuse_entry_unlinked(entry);
} else if (err == -EINTR)
fuse_invalidate_entry(entry);
return err;
@@ -851,10 +858,8 @@ static int fuse_rename_common(struct inode *olddir, struct dentry *oldent,
fuse_dir_changed(newdir);
/* newent will end up negative */
- if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) {
- fuse_invalidate_entry_cache(newent);
- fuse_update_ctime(d_inode(newent));
- }
+ if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent))
+ fuse_entry_unlinked(newent);
} else if (err == -EINTR) {
/* If request was interrupted, DEITY only knows if the
rename actually took place. If the invalidation