hpfs: don't truncate the file when delete fails

commit b6853f78e763d42c7a158d8de3549c9827c604ab upstream.

The delete opration can allocate additional space on the HPFS filesystem
due to btree split. The HPFS driver checks in advance if there is
available space, so that it won't corrupt the btree if we run out of space
during splitting.

If there is not enough available space, the HPFS driver attempted to
truncate the file, but this results in a deadlock since the commit
7dd29d8d865efdb00c0542a5d2c87af8c52ea6c7 ("HPFS: Introduce a global mutex
and lock it on every callback from VFS").

This patch removes the code that tries to truncate the file and -ENOSPC is
returned instead. If the user hits -ENOSPC on delete, he should try to
delete other files (that are stored in a leaf btree node), so that the
delete operation will make some space for deleting the file stored in
non-leaf btree node.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c
index ae4d5a1fa4c9b7f75ce188d8ec80e69d0a820892..bffb908acbd435fb661f31b7cc1a62a38e83cfa5 100644 (file)
--- a/fs/hpfs/namei.c
+++ b/fs/hpfs/namei.c
@@ -375,12 +375,11 @@ static int hpfs_unlink(struct inode *dir, struct dentry *dentry)
        struct inode *inode = d_inode(dentry);
        dnode_secno dno;
        int r;
-       int rep = 0;
        int err;
 
        hpfs_lock(dir->i_sb);
        hpfs_adjust_length(name, &len);
-again:
+
        err = -ENOENT;
        de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh);
        if (!de)
@@ -400,33 +399,9 @@ again:
                hpfs_error(dir->i_sb, "there was error when removing dirent");
                err = -EFSERROR;
                break;
-       case 2:         /* no space for deleting, try to truncate file */
-
+       case 2:         /* no space for deleting */
                err = -ENOSPC;
-               if (rep++)
-                       break;
-
-               dentry_unhash(dentry);
-               if (!d_unhashed(dentry)) {
-                       hpfs_unlock(dir->i_sb);
-                       return -ENOSPC;
-               }
-               if (generic_permission(inode, MAY_WRITE) ||
-                   !S_ISREG(inode->i_mode) ||
-                   get_write_access(inode)) {
-                       d_rehash(dentry);
-               } else {
-                       struct iattr newattrs;
-                       /*pr_info("truncating file before delete.\n");*/
-                       newattrs.ia_size = 0;
-                       newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
-                       err = notify_change(dentry, &newattrs, NULL);
-                       put_write_access(inode);
-                       if (!err)
-                               goto again;
-               }
-               hpfs_unlock(dir->i_sb);
-               return -ENOSPC;
+               break;
        default:
                drop_nlink(inode);
                err = 0;