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xfs: add a xfs_valid_startblock helper 

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>
This commit is contained in:
Christoph Hellwig 2019-09-03 08:13:13 -07:00 committed by Darrick J. Wong
parent 1baa2800e6
commit eb77b23b56
3 changed files with 11 additions and 4 deletions
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2
fs/xfs/libxfs/xfs_bmap.c
View File

@ -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));

7
fs/xfs/libxfs/xfs_bmap.h
View File

@ -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);

6
fs/xfs/xfs_iomap.c
View File

@ -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) {
@ -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:
@ -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) {