[ Upstream commit 2d8d7990619878a848b1d916c2f936d3012ee17d ]
Add a missing initialization of variable ap in setattr_chown().
Without, chown() may be able to bypass quotas.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit 5d9231111966b6c5a65016d58dcbeab91055bc91 ]
Commit 3e11e53041502 tries to suppress dlm_lock() lock conversion errors
that occur when the lockspace has already been released.
It does that by setting and checking the SDF_SKIP_DLM_UNLOCK flag. This
conflicts with the intended meaning of the SDF_SKIP_DLM_UNLOCK flag, so
check whether the lockspace is still allocated instead.
(Given the current DLM API, checking for this kind of error after the
fact seems easier that than to make sure that the lockspace is still
allocated before calling dlm_lock(). Changing the DLM API so that users
maintain the lockspace references themselves would be an option.)
Fixes: 3e11e53041502 ("GFS2: ignore unlock failures after withdraw")
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit c95346ac918c5badf51b9a7ac58a26d3bd5bb224 ]
In punch_hole(), when the offset lies in the final block for a given
height, there is no hole to punch, but the maximum size check fails to
detect that. Consequently, punch_hole() will try to punch a hole beyond
the end of the metadata and fail. Fix the maximum size check.
Signed-off-by: Andrew Price <anprice@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit 8877243beafa7c6bfc42022cbfdf9e39b25bd4fa ]
Syzkaller has reported a NULL pointer dereference when accessing
rgd->rd_rgl in gfs2_rgrp_dump(). This can happen when creating
rgd->rd_gl fails in read_rindex_entry(). Add a NULL pointer check in
gfs2_rgrp_dump() to prevent that.
Reported-and-tested-by: syzbot+da0fc229cc1ff4bb2e6d@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=da0fc229cc1ff4bb2e6d
Fixes: 72244b6bc752 ("gfs2: improve debug information when lvb mismatches are found")
Signed-off-by: Osama Muhammad <osmtendev@gmail.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit f38e998fbbb5da6a097ecd4b2700ba95eabab0c9 ]
Pass a non-NULL minext to gfs2_rbm_find even for single-block allocations. In
gfs2_rbm_find, also set rgd->rd_extfail_pt when a single-block allocation
fails in a resource group: there is no reason for treating that case
differently. In gfs2_reservation_check_and_update, only check how many free
blocks we have if more than one block is requested; we already know there's at
least one free block.
In addition, when allocating N blocks fails in gfs2_rbm_find, we need to set
rd_extfail_pt to N - 1 rather than N: rd_extfail_pt defines the biggest
allocation that might still succeed.
Finally, reset rd_extfail_pt when updating the resource group statistics in
update_rgrp_lvb, as we already do in gfs2_rgrp_bh_get.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Stable-dep-of: 8877243beafa ("gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump")
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit 2fdc2fa21bc72ec06c0c9f0e30b88fe1f2486b75 ]
This reverts commit e79e0e1428188b24c3b57309ffa54a33c4ae40c4.
It turns out that we're only setting the GBF_FULL flag of a bitmap if we've
been scanning from the beginning of the bitmap until the end and we haven't
found a single free block, and we're not skipping reservations in that process,
either. This means that in gfs2_rbm_find, we can always skip bitmaps with the
GBF_FULL flag set.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Stable-dep-of: 8877243beafa ("gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump")
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit 074d7306a4fe22fcac0b53f699f92757ab1cee99 ]
Commit 0abd1557e21c added rcu_dereference() for dereferencing ip->i_gl
in gfs2_permission. This now causes lockdep to complain when
gfs2_permission is called in non-RCU context:
WARNING: suspicious RCU usage in gfs2_permission
Switch to rcu_dereference_check() and check for the MAY_NOT_BLOCK flag
to shut up lockdep when we know that dereferencing ip->i_gl is safe.
Fixes: 0abd1557e21c ("gfs2: fix an oops in gfs2_permission")
Reported-by: syzbot+3e5130844b0c0e2b4948@syzkaller.appspotmail.com
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit 0abd1557e21c617bd13fc18f7725fc6363c05913 ]
In RCU mode, we might race with gfs2_evict_inode(), which zeroes
->i_gl. Freeing of the object it points to is RCU-delayed, so
if we manage to fetch the pointer before it's been replaced with
NULL, we are fine. Check if we'd fetched NULL and treat that
as "bail out and tell the caller to get out of RCU mode".
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit 4c6a08125f2249531ec01783a5f4317d7342add5 ]
When lots of quota changes are made, there may be cases in which an
inode's quota information is increased and then decreased, such as when
blocks are added to a file, then deleted from it. If the timing is
right, function do_qc can add pending quota changes to a transaction,
then later, another call to do_qc can negate those changes, resulting
in a net gain of 0. The quota_change information is recorded in the qc
buffer (and qd element of the inode as well). The buffer is added to the
transaction by the first call to do_qc, but a subsequent call changes
the value from non-zero back to zero. At that point it's too late to
remove the buffer_head from the transaction. Later, when the quota sync
code is called, the zero-change qd element is discovered and flagged as
an assert warning. If the fs is mounted with errors=panic, the kernel
will panic.
This is usually seen when files are truncated and the quota changes are
negated by punch_hole/truncate which uses gfs2_quota_hold and
gfs2_quota_unhold rather than block allocations that use gfs2_quota_lock
and gfs2_quota_unlock which automatically do quota sync.
This patch solves the problem by adding a check to qd_check_sync such
that net-zero quota changes already added to the transaction are no
longer deemed necessary to be synced, and skipped.
In this case references are taken for the qd and the slot from do_qc
so those need to be put. The normal sequence of events for a normal
non-zero quota change is as follows:
gfs2_quota_change
do_qc
qd_hold
slot_hold
Later, when the changes are to be synced:
gfs2_quota_sync
qd_fish
qd_check_sync
gets qd ref via lockref_get_not_dead
do_sync
do_qc(QC_SYNC)
qd_put
lockref_put_or_lock
qd_unlock
qd_put
lockref_put_or_lock
In the net-zero change case, we add a check to qd_check_sync so it puts
the qd and slot references acquired in gfs2_quota_change and skip the
unneeded sync.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
