tree ba7a8289abb31dddd2658f9aaa161d0ca51bb9ca
parent e073a6acea88011b3eb76a8598c574be3988b861
author Darrick J. Wong <darrick.wong@oracle.com> 1575423367 -0800
committer Darrick J. Wong <darrick.wong@oracle.com> 1577206867 -0800

xfs: fix log reservation overflows when allocating large rt extents

Omar Sandoval reported that a 4G fallocate on the realtime device causes
filesystem shutdowns due to a log reservation overflow that happens when
we log the rtbitmap updates.  Factor rtbitmap/rtsummary updates into the
the tr_write and tr_itruncate log reservation calculation.

"The following reproducer results in a transaction log overrun warning
for me:

    mkfs.xfs -f -r rtdev=/dev/vdc -d rtinherit=1 -m reflink=0 /dev/vdb
    mount -o rtdev=/dev/vdc /dev/vdb /mnt
    fallocate -l 4G /mnt/foo

Reported-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>