ext4: goto right label 'out_mmap_sem' in ext4_setattr()

JIRA: https://issues.redhat.com/browse/RHEL-109217

commit 7e91ae3
Author: Baokun Li <libaokun1@huawei.com>
Date:   Thu Feb 13 19:22:47 2025 +0800

    ext4: goto right label 'out_mmap_sem' in ext4_setattr()

    Otherwise, if ext4_inode_attach_jinode() fails, a hung task will
    happen because filemap_invalidate_unlock() isn't called to unlock
    mapping->invalidate_lock. Like this:

    EXT4-fs error (device sda) in ext4_setattr:5557: Out of memory
    INFO: task fsstress:374 blocked for more than 122 seconds.
          Not tainted 6.14.0-rc1-next-20250206-xfstests-dirty #726
    "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    task:fsstress state:D stack:0     pid:374   tgid:374   ppid:373
                                      task_flags:0x440140 flags:0x00000000
    Call Trace:
     <TASK>
     __schedule+0x2c9/0x7f0
     schedule+0x27/0xa0
     schedule_preempt_disabled+0x15/0x30
     rwsem_down_read_slowpath+0x278/0x4c0
     down_read+0x59/0xb0
     page_cache_ra_unbounded+0x65/0x1b0
     filemap_get_pages+0x124/0x3e0
     filemap_read+0x114/0x3d0
     vfs_read+0x297/0x360
     ksys_read+0x6c/0xe0
     do_syscall_64+0x4b/0x110
     entry_SYSCALL_64_after_hwframe+0x76/0x7e

    Fixes: c7fc036 ("ext4: partial zero eof block on unaligned inode size extension")
    Signed-off-by: Baokun Li <libaokun1@huawei.com>
    Reviewed-by: Jan Kara <jack@suse.cz>
    Reviewed-by: Brian Foster <bfoster@redhat.com>
    Link: https://patch.msgid.link/20250213112247.3168709-1-libaokun@huaweicloud.com
    Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Signed-off-by: Brian Foster <bfoster@redhat.com>

Author: Brian Foster

fs/ext4/inode.c

@@ -5655,7 +5655,7 @@ int ext4_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 			    oldsize & (inode->i_sb->s_blocksize - 1)) {
 				error = ext4_inode_attach_jinode(inode);
 				if (error)
-					goto err_out;
+					goto out_mmap_sem;
 			}
 
 			handle = ext4_journal_start(inode, EXT4_HT_INODE, 3);