[PATCHSET 6.12] xfs: backported fixes from upstream

[PATCHSET 6.12] xfs: backported fixes from upstream

[Darrick J. Wong]

Hi all,

Here's a bunch of hand-ported bug fixes for 6.12 LTS.

If you're going to start using this code, I strongly recommend pulling
from my git trees, which are linked below.

With a bit of luck, this should all go splendidly.
Comments and questions are, as always, welcome.

--D

kernel git tree:
https://git.kernel.org/cgit/linux/kernel/git/djwong/xfs-linux.git/log/?h=next-6.12.y
---
Commits in this patchset:
 * xfs: do not check NEEDSREPAIR if ro,norecovery mount.
 * xfs: Do not allow norecovery mount with quotacheck
 * xfs: rename xfs_iomap_swapfile_activate to xfs_vm_swap_activate
 * xfs: flush inodegc before swapon
---
 fs/xfs/xfs_aops.c   |   41 +++++++++++++++++++++++++++++++++++++----
 fs/xfs/xfs_qm_bhv.c |   49 ++++++++++++++++++++++++++++++++++---------------
 fs/xfs/xfs_super.c  |    8 ++++++--
 3 files changed, 77 insertions(+), 21 deletions(-)

[PATCH 1/4] xfs: do not check NEEDSREPAIR if ro,norecovery mount.

[Darrick J. Wong]

From: Lukas Herbolt <lukas@herbolt.com>

Commit 9e00163c31676c6b43d2334fdf5b406232f42dee upstream

If there is corrutpion on the filesystem andxfs_repair
fails to repair it. The last resort of getting the data
is to use norecovery,ro mount. But if the NEEDSREPAIR is
set the filesystem cannot be mounted. The flag must be
cleared out manually using xfs_db, to get access to what
left over of the corrupted fs.

Signed-off-by: Lukas Herbolt <lukas@herbolt.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
---
 fs/xfs/xfs_super.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)


diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 8f7c9eaeb36090..201a86b3574da5 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1619,8 +1619,12 @@ xfs_fs_fill_super(
 #endif
 	}
 
-	/* Filesystem claims it needs repair, so refuse the mount. */
-	if (xfs_has_needsrepair(mp)) {
+	/*
+	 * Filesystem claims it needs repair, so refuse the mount unless
+	 * norecovery is also specified, in which case the filesystem can
+	 * be mounted with no risk of further damage.
+	 */
+	if (xfs_has_needsrepair(mp) && !xfs_has_norecovery(mp)) {
 		xfs_warn(mp, "Filesystem needs repair.  Please run xfs_repair.");
 		error = -EFSCORRUPTED;
 		goto out_free_sb;

[PATCH 2/4] xfs: Do not allow norecovery mount with quotacheck

[Darrick J. Wong]

From: Carlos Maiolino <cem@kernel.org>

Commit 9f0902091c332b2665951cfb970f60ae7cbdc0f3 upstream

Mounting a filesystem that requires quota state changing will generate a
transaction.

We already check for a read-only device; we should do that for
norecovery too.

A quotacheck on a norecovery mount, and with the right log size, will cause
the mount process to hang on:

[<0>] xlog_grant_head_wait+0x5d/0x2a0 [xfs]
[<0>] xlog_grant_head_check+0x112/0x180 [xfs]
[<0>] xfs_log_reserve+0xe3/0x260 [xfs]
[<0>] xfs_trans_reserve+0x179/0x250 [xfs]
[<0>] xfs_trans_alloc+0x101/0x260 [xfs]
[<0>] xfs_sync_sb+0x3f/0x80 [xfs]
[<0>] xfs_qm_mount_quotas+0xe3/0x2f0 [xfs]
[<0>] xfs_mountfs+0x7ad/0xc20 [xfs]
[<0>] xfs_fs_fill_super+0x762/0xa50 [xfs]
[<0>] get_tree_bdev_flags+0x131/0x1d0
[<0>] vfs_get_tree+0x26/0xd0
[<0>] vfs_cmd_create+0x59/0xe0
[<0>] __do_sys_fsconfig+0x4e3/0x6b0
[<0>] do_syscall_64+0x82/0x160
[<0>] entry_SYSCALL_64_after_hwframe+0x76/0x7e

This is caused by a transaction running with bogus initialized head/tail

I initially hit this while running generic/050, with random log
sizes, but I managed to reproduce it reliably here with the steps
below:

mkfs.xfs -f -lsize=1025M -f -b size=4096 -m crc=1,reflink=1,rmapbt=1, -i
sparse=1 /dev/vdb2 > /dev/null
mount -o usrquota,grpquota,prjquota /dev/vdb2 /mnt
xfs_io -x -c 'shutdown -f' /mnt
umount /mnt
mount -o ro,norecovery,usrquota,grpquota,prjquota  /dev/vdb2 /mnt

Last mount hangs up

As we add yet another validation if quota state is changing, this also
add a new helper named xfs_qm_validate_state_change(), factoring the
quota state changes out of xfs_qm_newmount() to reduce cluttering
within it.

Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
---
 fs/xfs/xfs_qm_bhv.c |   49 ++++++++++++++++++++++++++++++++++---------------
 1 file changed, 34 insertions(+), 15 deletions(-)


diff --git a/fs/xfs/xfs_qm_bhv.c b/fs/xfs/xfs_qm_bhv.c
index ed1d597c30ca25..dabb1d6d7e463e 100644
--- a/fs/xfs/xfs_qm_bhv.c
+++ b/fs/xfs/xfs_qm_bhv.c
@@ -79,6 +79,28 @@ xfs_qm_statvfs(
 	}
 }
 
+STATIC int
+xfs_qm_validate_state_change(
+	struct xfs_mount	*mp,
+	uint			uqd,
+	uint			gqd,
+	uint			pqd)
+{
+	int state;
+
+	/* Is quota state changing? */
+	state = ((uqd && !XFS_IS_UQUOTA_ON(mp)) ||
+		(!uqd &&  XFS_IS_UQUOTA_ON(mp)) ||
+		 (gqd && !XFS_IS_GQUOTA_ON(mp)) ||
+		(!gqd &&  XFS_IS_GQUOTA_ON(mp)) ||
+		 (pqd && !XFS_IS_PQUOTA_ON(mp)) ||
+		(!pqd &&  XFS_IS_PQUOTA_ON(mp)));
+
+	return  state &&
+		(xfs_dev_is_read_only(mp, "changing quota state") ||
+		xfs_has_norecovery(mp));
+}
+
 int
 xfs_qm_newmount(
 	xfs_mount_t	*mp,
@@ -98,24 +120,21 @@ xfs_qm_newmount(
 	}
 
 	/*
-	 * If the device itself is read-only, we can't allow
-	 * the user to change the state of quota on the mount -
-	 * this would generate a transaction on the ro device,
-	 * which would lead to an I/O error and shutdown
+	 * If the device itself is read-only and/or in norecovery
+	 * mode, we can't allow the user to change the state of
+	 * quota on the mount - this would generate a transaction
+	 * on the ro device, which would lead to an I/O error and
+	 * shutdown.
 	 */
 
-	if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
-	    (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
-	     (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
-	    (!gquotaondisk &&  XFS_IS_GQUOTA_ON(mp)) ||
-	     (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
-	    (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)))  &&
-	    xfs_dev_is_read_only(mp, "changing quota state")) {
+	if (xfs_qm_validate_state_change(mp, uquotaondisk,
+			    gquotaondisk, pquotaondisk)) {
+
 		xfs_warn(mp, "please mount with%s%s%s%s.",
-			(!quotaondisk ? "out quota" : ""),
-			(uquotaondisk ? " usrquota" : ""),
-			(gquotaondisk ? " grpquota" : ""),
-			(pquotaondisk ? " prjquota" : ""));
+				(!quotaondisk ? "out quota" : ""),
+				(uquotaondisk ? " usrquota" : ""),
+				(gquotaondisk ? " grpquota" : ""),
+				(pquotaondisk ? " prjquota" : ""));
 		return -EPERM;
 	}
 

[PATCH 3/4] xfs: rename xfs_iomap_swapfile_activate to xfs_vm_swap_activate

[Darrick J. Wong]

From: Christoph Hellwig <hch@lst.de>

Commit 3cd6a8056f5a2e794c42fc2114ee2611e358b357 upstream

Match the method name and the naming convention or address_space
operations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
---
 fs/xfs/xfs_aops.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)


diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 559a3a57709748..d2c7be12f5666b 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -528,7 +528,7 @@ xfs_vm_readahead(
 }
 
 static int
-xfs_iomap_swapfile_activate(
+xfs_vm_swap_activate(
 	struct swap_info_struct		*sis,
 	struct file			*swap_file,
 	sector_t			*span)
@@ -549,11 +549,11 @@ const struct address_space_operations xfs_address_space_operations = {
 	.migrate_folio		= filemap_migrate_folio,
 	.is_partially_uptodate  = iomap_is_partially_uptodate,
 	.error_remove_folio	= generic_error_remove_folio,
-	.swap_activate		= xfs_iomap_swapfile_activate,
+	.swap_activate		= xfs_vm_swap_activate,
 };
 
 const struct address_space_operations xfs_dax_aops = {
 	.writepages		= xfs_dax_writepages,
 	.dirty_folio		= noop_dirty_folio,
-	.swap_activate		= xfs_iomap_swapfile_activate,
+	.swap_activate		= xfs_vm_swap_activate,
 };

[PATCH 4/4] xfs: flush inodegc before swapon

[Darrick J. Wong]

From: Christoph Hellwig <hch@lst.de>

Commit 2d873efd174bae9005776937d5ac6a96050266db upstream

Fix the brand new xfstest that tries to swapon on a recently unshared
file and use the chance to document the other bit of magic in this
function.

The big comment is taken from a mailinglist post by Dave Chinner.

Fixes: 5e672cd69f0a53 ("xfs: introduce xfs_inodegc_push()")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
---
 fs/xfs/xfs_aops.c |   35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)


diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index d2c7be12f5666b..ba6b4a180e8081 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -19,6 +19,7 @@
 #include "xfs_reflink.h"
 #include "xfs_errortag.h"
 #include "xfs_error.h"
+#include "xfs_icache.h"
 
 struct xfs_writepage_ctx {
 	struct iomap_writepage_ctx ctx;
@@ -533,7 +534,39 @@ xfs_vm_swap_activate(
 	struct file			*swap_file,
 	sector_t			*span)
 {
-	sis->bdev = xfs_inode_buftarg(XFS_I(file_inode(swap_file)))->bt_bdev;
+	struct xfs_inode		*ip = XFS_I(file_inode(swap_file));
+
+	/*
+	 * Swap file activation can race against concurrent shared extent
+	 * removal in files that have been cloned.  If this happens,
+	 * iomap_swapfile_iter() can fail because it encountered a shared
+	 * extent even though an operation is in progress to remove those
+	 * shared extents.
+	 *
+	 * This race becomes problematic when we defer extent removal
+	 * operations beyond the end of a syscall (i.e. use async background
+	 * processing algorithms).  Users think the extents are no longer
+	 * shared, but iomap_swapfile_iter() still sees them as shared
+	 * because the refcountbt entries for the extents being removed have
+	 * not yet been updated.  Hence the swapon call fails unexpectedly.
+	 *
+	 * The race condition is currently most obvious from the unlink()
+	 * operation as extent removal is deferred until after the last
+	 * reference to the inode goes away.  We then process the extent
+	 * removal asynchronously, hence triggers the "syscall completed but
+	 * work not done" condition mentioned above.  To close this race
+	 * window, we need to flush any pending inodegc operations to ensure
+	 * they have updated the refcountbt records before we try to map the
+	 * swapfile.
+	 */
+	xfs_inodegc_flush(ip->i_mount);
+
+	/*
+	 * Direct the swap code to the correct block device when this file
+	 * sits on the RT device.
+	 */
+	sis->bdev = xfs_inode_buftarg(ip)->bt_bdev;
+
 	return iomap_swapfile_activate(sis, swap_file, span,
 			&xfs_read_iomap_ops);
 }

Re: [PATCH 1/4] xfs: do not check NEEDSREPAIR if ro,norecovery mount.

[Sasha Levin]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: 9e00163c31676c6b43d2334fdf5b406232f42dee

WARNING: Author mismatch between patch and upstream commit:
Backport author: "Darrick J. Wong"<djwong@kernel.org>
Commit author: Lukas Herbolt<lukas@herbolt.com>

Note: The patch differs from the upstream commit:
---
1:  9e00163c31676 < -:  ------------- xfs: do not check NEEDSREPAIR if ro,norecovery mount.
-:  ------------- > 1:  ea061bad207e1 Linux 6.14.4
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-5.4.y        |  Success    |  Success   |

Re: [PATCH 2/4] xfs: Do not allow norecovery mount with quotacheck

[Sasha Levin]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: 9f0902091c332b2665951cfb970f60ae7cbdc0f3

WARNING: Author mismatch between patch and upstream commit:
Backport author: "Darrick J. Wong"<djwong@kernel.org>
Commit author: Carlos Maiolino<cem@kernel.org>

Note: The patch differs from the upstream commit:
---
1:  9f0902091c332 < -:  ------------- xfs: Do not allow norecovery mount with quotacheck
-:  ------------- > 1:  ea061bad207e1 Linux 6.14.4
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-5.4.y        |  Success    |  Success   |

Re: [PATCH 3/4] xfs: rename xfs_iomap_swapfile_activate to xfs_vm_swap_activate

[Sasha Levin]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: 3cd6a8056f5a2e794c42fc2114ee2611e358b357

WARNING: Author mismatch between patch and upstream commit:
Backport author: "Darrick J. Wong"<djwong@kernel.org>
Commit author: Christoph Hellwig<hch@lst.de>

Note: The patch differs from the upstream commit:
---
1:  3cd6a8056f5a2 < -:  ------------- xfs: rename xfs_iomap_swapfile_activate to xfs_vm_swap_activate
-:  ------------- > 1:  ea061bad207e1 Linux 6.14.4
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-5.4.y        |  Success    |  Success   |

Re: [PATCH 4/4] xfs: flush inodegc before swapon

[Sasha Levin]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: 2d873efd174bae9005776937d5ac6a96050266db

WARNING: Author mismatch between patch and upstream commit:
Backport author: "Darrick J. Wong"<djwong@kernel.org>
Commit author: Christoph Hellwig<hch@lst.de>

Note: The patch differs from the upstream commit:
---
1:  2d873efd174ba < -:  ------------- xfs: flush inodegc before swapon
-:  ------------- > 1:  ea061bad207e1 Linux 6.14.4
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-5.4.y        |  Success    |  Success   |