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Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/fs/open.c b/fs/open.c
index d58525dda28d..d3ed8171e8e0 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -68,6 +68,7 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
long vfs_truncate(const struct path *path, loff_t length)
{
struct inode *inode;
+ struct dentry *upperdentry;
long error;
inode = path->dentry->d_inode;
@@ -90,7 +91,17 @@ long vfs_truncate(const struct path *path, loff_t length)
if (IS_APPEND(inode))
goto mnt_drop_write_and_out;
- error = get_write_access(inode);
+ /*
+ * If this is an overlayfs then do as if opening the file so we get
+ * write access on the upper inode, not on the overlay inode. For
+ * non-overlay filesystems d_real() is an identity function.
+ */
+ upperdentry = d_real(path->dentry, NULL, O_WRONLY);
+ error = PTR_ERR(upperdentry);
+ if (IS_ERR(upperdentry))
+ goto mnt_drop_write_and_out;
+
+ error = get_write_access(upperdentry->d_inode);
if (error)
goto mnt_drop_write_and_out;
@@ -109,7 +120,7 @@ long vfs_truncate(const struct path *path, loff_t length)
error = do_truncate(path->dentry, length, 0, NULL);
put_write_and_out:
- put_write_access(inode);
+ put_write_access(upperdentry->d_inode);
mnt_drop_write_and_out:
mnt_drop_write(path->mnt);
out:
@@ -294,7 +305,8 @@ int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
* Let individual file system decide if it supports preallocation
* for directories or not.
*/
- if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
+ if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
+ !S_ISBLK(inode->i_mode))
return -ENODEV;
/* Check for wrap through zero too */
@@ -731,7 +743,7 @@ static int do_dentry_open(struct file *f,
if (error)
goto cleanup_all;
- error = break_lease(inode, f->f_flags);
+ error = break_lease(locks_inode(f), f->f_flags);
if (error)
goto cleanup_all;