* [bug report] xfs: mark speculative prealloc CoW fork extents unwritten
@ 2017-02-13 19:03 Dan Carpenter
2017-02-14 6:54 ` Darrick J. Wong
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2017-02-13 19:03 UTC (permalink / raw)
To: darrick.wong; +Cc: linux-xfs
Hello Darrick J. Wong,
The patch 5eda43000064: "xfs: mark speculative prealloc CoW fork
extents unwritten" from Feb 2, 2017, leads to the following static
checker warning:
fs/xfs/xfs_reflink.c:381 xfs_reflink_convert_cow()
error: uninitialized symbol 'error'.
fs/xfs/xfs_reflink.c
350 /* Convert all of the unwritten CoW extents in a file's range to real ones. */
351 int
352 xfs_reflink_convert_cow(
353 struct xfs_inode *ip,
354 xfs_off_t offset,
355 xfs_off_t count)
356 {
357 struct xfs_bmbt_irec got;
358 struct xfs_defer_ops dfops;
359 struct xfs_mount *mp = ip->i_mount;
360 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
361 xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
362 xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count);
363 xfs_extnum_t idx;
364 bool found;
365 int error;
^^^^^
366
367 xfs_ilock(ip, XFS_ILOCK_EXCL);
368
369 /* Convert all the extents to real from unwritten. */
370 for (found = xfs_iext_lookup_extent(ip, ifp, offset_fsb, &idx, &got);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
What if found fails on the first iteration through the loop?
371 found && got.br_startoff < end_fsb;
372 found = xfs_iext_get_extent(ifp, ++idx, &got)) {
373 error = xfs_reflink_convert_cow_extent(ip, &got, offset_fsb,
374 end_fsb - offset_fsb, &dfops);
375 if (error)
376 break;
377 }
378
379 /* Finish up. */
380 xfs_iunlock(ip, XFS_ILOCK_EXCL);
381 return error;
^^^^^^^^^^^^
382 }
regards,
dan carpenter
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [bug report] xfs: mark speculative prealloc CoW fork extents unwritten
2017-02-13 19:03 [bug report] xfs: mark speculative prealloc CoW fork extents unwritten Dan Carpenter
@ 2017-02-14 6:54 ` Darrick J. Wong
0 siblings, 0 replies; 2+ messages in thread
From: Darrick J. Wong @ 2017-02-14 6:54 UTC (permalink / raw)
To: Dan Carpenter; +Cc: linux-xfs
On Mon, Feb 13, 2017 at 10:03:43PM +0300, Dan Carpenter wrote:
> Hello Darrick J. Wong,
>
> The patch 5eda43000064: "xfs: mark speculative prealloc CoW fork
> extents unwritten" from Feb 2, 2017, leads to the following static
> checker warning:
>
> fs/xfs/xfs_reflink.c:381 xfs_reflink_convert_cow()
> error: uninitialized symbol 'error'.
>
> fs/xfs/xfs_reflink.c
> 350 /* Convert all of the unwritten CoW extents in a file's range to real ones. */
> 351 int
> 352 xfs_reflink_convert_cow(
> 353 struct xfs_inode *ip,
> 354 xfs_off_t offset,
> 355 xfs_off_t count)
> 356 {
> 357 struct xfs_bmbt_irec got;
> 358 struct xfs_defer_ops dfops;
> 359 struct xfs_mount *mp = ip->i_mount;
> 360 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
> 361 xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
> 362 xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count);
> 363 xfs_extnum_t idx;
> 364 bool found;
> 365 int error;
> ^^^^^
> 366
> 367 xfs_ilock(ip, XFS_ILOCK_EXCL);
> 368
> 369 /* Convert all the extents to real from unwritten. */
> 370 for (found = xfs_iext_lookup_extent(ip, ifp, offset_fsb, &idx, &got);
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> What if found fails on the first iteration through the loop?
Oops, that's a bug, will send patch.
--D
>
> 371 found && got.br_startoff < end_fsb;
> 372 found = xfs_iext_get_extent(ifp, ++idx, &got)) {
> 373 error = xfs_reflink_convert_cow_extent(ip, &got, offset_fsb,
> 374 end_fsb - offset_fsb, &dfops);
> 375 if (error)
> 376 break;
> 377 }
> 378
> 379 /* Finish up. */
> 380 xfs_iunlock(ip, XFS_ILOCK_EXCL);
> 381 return error;
> ^^^^^^^^^^^^
> 382 }
>
> regards,
> dan carpenter
> --
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