Skip to content

Commit

Permalink
xfs: add a xfs_valid_startblock helper
Browse files Browse the repository at this point in the history
Add a helper that validates the startblock is valid.  This checks for a
non-zero block on the main device, but skips that check for blocks on
the realtime device.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
  • Loading branch information
Christoph Hellwig authored and Darrick J. Wong committed Sep 3, 2019
1 parent 1baa280 commit eb77b23
Show file tree
Hide file tree
Showing 3 changed files with 11 additions and 4 deletions.
2 changes: 1 addition & 1 deletion fs/xfs/libxfs/xfs_bmap.c
Original file line number Diff line number Diff line change
Expand Up @@ -4515,7 +4515,7 @@ xfs_bmapi_convert_delalloc(
if (WARN_ON_ONCE(bma.blkno == NULLFSBLOCK))
goto out_finish;
error = -EFSCORRUPTED;
if (WARN_ON_ONCE(!bma.got.br_startblock && !XFS_IS_REALTIME_INODE(ip)))
if (WARN_ON_ONCE(!xfs_valid_startblock(ip, bma.got.br_startblock)))
goto out_finish;

XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, bma.length));
Expand Down
7 changes: 7 additions & 0 deletions fs/xfs/libxfs/xfs_bmap.h
Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,13 @@ static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec)
!isnullstartblock(irec->br_startblock);
}

/*
* Check the mapping for obviously garbage allocations that could trash the
* filesystem immediately.
*/
#define xfs_valid_startblock(ip, startblock) \
((startblock) != 0 || XFS_IS_REALTIME_INODE(ip))

void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
xfs_filblks_t len);
int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
Expand Down
6 changes: 3 additions & 3 deletions fs/xfs/xfs_iomap.c
Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,7 @@ xfs_bmbt_to_iomap(
{
struct xfs_mount *mp = ip->i_mount;

if (unlikely(!imap->br_startblock && !XFS_IS_REALTIME_INODE(ip)))
if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
return xfs_alert_fsblock_zero(ip, imap);

if (imap->br_startblock == HOLESTARTBLOCK) {
Expand Down Expand Up @@ -297,7 +297,7 @@ xfs_iomap_write_direct(
goto out_unlock;
}

if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
error = xfs_alert_fsblock_zero(ip, imap);

out_unlock:
Expand Down Expand Up @@ -814,7 +814,7 @@ xfs_iomap_write_unwritten(
if (error)
return error;

if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
if (unlikely(!xfs_valid_startblock(ip, imap.br_startblock)))
return xfs_alert_fsblock_zero(ip, &imap);

if ((numblks_fsb = imap.br_blockcount) == 0) {
Expand Down

0 comments on commit eb77b23

Please sign in to comment.