This set fixes a process hang issue in btrfs and gf2 filesystems. When we
do a direct IO read or write when the buffer given by the user is
memory-mapped to the file range we are going to do IO, we end up ending
in a deadlock. This is triggered by the test case generic/647 from
fstests.
This fix depends on the iov_iter and iomap changes introduced in the
commit c03098d4b9ad ("Merge tag 'gfs2-v5.15-rc5-mmap-fault' of
git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2") and they
are part of this set for stable-5.15.y.
Please note that patch 3/17 in this patchset changes the prototype and
renames an exported symbol as below. All its references are updated as
well.
-EXPORT_SYMBOL(iov_iter_fault_in_readable);
+EXPORT_SYMBOL(fault_in_iov_iter_readable);
Andreas Gruenbacher (15):
powerpc/kvm: Fix kvm_use_magic_page
gup: Turn fault_in_pages_{readable,writeable} into
fault_in_{readable,writeable}
iov_iter: Turn iov_iter_fault_in_readable into
fault_in_iov_iter_readable
iov_iter: Introduce fault_in_iov_iter_writeable
gfs2: Add wrapper for iomap_file_buffered_write
gfs2: Clean up function may_grant
gfs2: Move the inode glock locking to gfs2_file_buffered_write
gfs2: Eliminate ip->i_gh
gfs2: Fix mmap + page fault deadlocks for buffered I/O
iomap: Fix iomap_dio_rw return value for user copies
iomap: Support partial direct I/O on user copy failures
iomap: Add done_before argument to iomap_dio_rw
gup: Introduce FOLL_NOFAULT flag to disable page faults
iov_iter: Introduce nofault flag to disable page faults
gfs2: Fix mmap + page fault deadlocks for direct I/O
Bob Peterson (1):
gfs2: Introduce flag for glock holder auto-demotion
Filipe Manana (1):
btrfs: fix deadlock due to page faults during direct IO reads and
writes
arch/powerpc/kernel/kvm.c | 3 +-
arch/powerpc/kernel/signal_32.c | 4 +-
arch/powerpc/kernel/signal_64.c | 2 +-
arch/x86/kernel/fpu/signal.c | 7 +-
drivers/gpu/drm/armada/armada_gem.c | 7 +-
fs/btrfs/file.c | 142 ++++++++++--
fs/btrfs/ioctl.c | 5 +-
fs/erofs/data.c | 2 +-
fs/ext4/file.c | 5 +-
fs/f2fs/file.c | 2 +-
fs/fuse/file.c | 2 +-
fs/gfs2/bmap.c | 60 +----
fs/gfs2/file.c | 252 +++++++++++++++++++--
fs/gfs2/glock.c | 330 +++++++++++++++++++++-------
fs/gfs2/glock.h | 20 ++
fs/gfs2/incore.h | 4 +-
fs/iomap/buffered-io.c | 2 +-
fs/iomap/direct-io.c | 29 ++-
fs/ntfs/file.c | 2 +-
fs/ntfs3/file.c | 2 +-
fs/xfs/xfs_file.c | 6 +-
fs/zonefs/super.c | 4 +-
include/linux/iomap.h | 11 +-
include/linux/mm.h | 3 +-
include/linux/pagemap.h | 58 +----
include/linux/uio.h | 4 +-
lib/iov_iter.c | 98 +++++++--
mm/filemap.c | 4 +-
mm/gup.c | 139 +++++++++++-
29 files changed, 911 insertions(+), 298 deletions(-)
--
2.33.1
