Overall, this function tries to find and invalidate all buffers for a
given extent of space on the data device.  The inner for loop in this
function tries to find all xfs_bufs for a given daddr.  The lengths of
all possible cached buffers range from 1 fsblock to the largest needed
to contain a 64k xattr value (~17fsb).  The scan is capped to avoid
looking at anything buffer going past the given extent.

Unfortunately, the loop continuation test is wrong -- max_fsbs is the
largest size we want to scan, not one past that.  Put another way, this
loop is actually 1-indexed, not 0-indexed.  Therefore, the continuation
test should use <=, not <.

As a result, online repairs of btree blocks fails to stale any buffers
for btrees that are being torn down, which causes later assertions in
the buffer cache when another thread creates a different-sized buffer.
This happens in xfs/709 when allocating an inode cluster buffer:

 ------------[ cut here ]------------
 WARNING: CPU: 0 PID: 3346128 at fs/xfs/xfs_message.c:104 assfail+0x3a/0x40 [xfs]
 CPU: 0 PID: 3346128 Comm: fsstress Not tainted 6.7.0-rc4-djwx #rc4
 RIP: 0010:assfail+0x3a/0x40 [xfs]
 Call Trace:
  <TASK>
  _xfs_buf_obj_cmp+0x4a/0x50
  xfs_buf_get_map+0x191/0xba0
  xfs_trans_get_buf_map+0x136/0x280
  xfs_ialloc_inode_init+0x186/0x340
  xfs_ialloc_ag_alloc+0x254/0x720
  xfs_dialloc+0x21f/0x870
  xfs_create_tmpfile+0x1a9/0x2f0
  xfs_rename+0x369/0xfd0
  xfs_vn_rename+0xfa/0x170
  vfs_rename+0x5fb/0xc30
  do_renameat2+0x52d/0x6e0
  __x64_sys_renameat2+0x4b/0x60
  do_syscall_64+0x3b/0xe0
  entry_SYSCALL_64_after_hwframe+0x46/0x4e

A later refactoring patch in the online repair series fixed this by
accident, which is why I didn't notice this until I started testing only
the patches that are likely to end up in 6.8.

Fixes: 1c7ce115 ("xfs: reap large AG metadata extents when possible")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>