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As an optimization, I was trying to work on exiting early from this
function if dealing with unwritten extent since they anyways read 0.
However, it was realised that there are certain code paths that can
end up calling ext4_block_zero_page_range() for an unwritten bh that
might still have data in pagecache. In this case, we can't exit early
and we do require to process the bh and zero out the pagecache to ensure
that a writeback can't kick in at a later time and flush the stale
pagecache to disk.
Since, adding the logic to exit early for unwritten bh was turning out
to be much more nuanced and the current code already handles it well,
just add a comment to explicitly document this behavior.
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/d859b7ae5fe42e6626479b91ed9f4da3aae4c597.1698856309.git.ojaswin@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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The call to filemap_write_and_wait_range() assumes the range passed to be
inclusive, so fix the call to make sure we follow that.
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/e503107a7c73a2b68dec645c5ad798c437717c45.1698856309.git.ojaswin@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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dioread_nolock was originally disabled as a default option for bs < ps
scenarios due to a data corruption issue. Since then, we've had some
fixes in this area which address such issues. Enable dioread_nolock by
default and remove the experimental warning message for bs < ps path.
dioread for bs < ps has been tested on a 64k pagesize machine using:
kvm-xfstest -C 3 -g auto
with the following configs:
64k adv bigalloc_4k bigalloc_64k data_journal encrypt
dioread_nolock dioread_nolock_4k ext3 ext3conv nojournal
And no new regressions were seen compared to baseline kernel.
Suggested-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20231101154717.531865-1-ojaswin@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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'blocks_per_page' is always 1 after 'if (blocks_per_page >= 2)',
'pnum' and 'block' are equal in this case.
Signed-off-by: Gou Hao <gouhao@uniontech.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20231024035215.29474-1-gouhao@uniontech.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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It's not safe to call nfsd_put once nfsd_last_thread has been called, as
that function will zero out the nn->nfsd_serv pointer.
Drop the nfsd_put helper altogether and open-code the svc_put in its
callers instead. That allows us to not be reliant on the value of that
pointer when handling an error.
Fixes: 2a501f55cd64 ("nfsd: call nfsd_last_thread() before final nfsd_put()")
Reported-by: Zhi Li <yieli@redhat.com>
Cc: NeilBrown <neilb@suse.de>
Signed-off-by: Jeffrey Layton <jlayton@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
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Cross-merge networking fixes after downstream PR.
Conflicts:
drivers/net/ethernet/broadcom/bnxt/bnxt.c
e009b2efb7a8 ("bnxt_en: Remove mis-applied code from bnxt_cfg_ntp_filters()")
0f2b21477988 ("bnxt_en: Fix compile error without CONFIG_RFS_ACCEL")
https://lore.kernel.org/all/20240105115509.225aa8a2@canb.auug.org.au/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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For backchannel requests that lookup the appropriate nfs_client, use the
state-management rpc_clnt's rpc_timeout parameters for the backchannel's
response. When the nfs_client cannot be found, fall back to using the
xprt's default timeout parameters.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Tested-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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The kfree() function was called in one case by
the bl_resolve_deviceid() function during error handling
even if the passed data structure member contained a null pointer.
This issue was detected by using the Coccinelle software.
Thus use an other label.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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NFS already has writepages and migrate_folio, so it does not need to
implement writepage. The writepage operation is deprecated as it leads
to worse performance under high memory pressure due to folios being
written out in LRU order rather than sequentially within a file.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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Now that we're calculating how large a remaining IO should be based
on the current request's offset, we no longer need to track bytes_left on
each struct nfs_direct_req. Drop the field, and clean up the direct
request tracepoints.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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Instead of relying on the value of the 'bytes_left' field, we should
calculate the layout size based on the offset of the request that is
being written out.
Reported-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Fixes: 954998b60caa ("NFS: Fix error handling for O_DIRECT write scheduling")
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Tested-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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With this we can see the dentry -> inode linkage that's being
revalidated. A fileid of 0 means "negative dentry".
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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We do async renames in other cases besides sillyrenames now. This
tracepoint name is now misleading.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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Add a call to the v4 d_revalidate entrypoint, just like the v3 one.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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Once the client has processed the CB_LAYOUTRECALL, but has not yet
successfully returned the layout, the server is supposed to switch to
returning NFS4ERR_RETURNCONFLICT. This patch ensures that we handle
that return value correctly.
Fixes: 183d9e7b112a ("pnfs: rework LAYOUTGET retry handling")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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If the server is recalling a layout, and sends us a list of referring
calls that we can see are complete, then we should just trust that the
stateid argument is correct, even if the sequence id doesn't match the
one we hold.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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When the server gives us a set of referring calls, to tell us that the
NFSv4.1 callback needs to be ordered with respect to those calls, then
we may want to make that information available to the operations. In
certain cases, it may allow them to optimise their behaviour due to the
extra knowledge.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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The subjective cred (task->cred) can potentially be overridden and
subsquently freed in non-RCU context, which could lead to a panic if we
try to use it in cred_fscmp(). Use __task_cred(), which returns the
objective cred (task->real_cred) instead.
Fixes: 0eb43812c027 ("NFS: Clear the file access cache upon login")
Fixes: 5e9a7b9c2ea1 ("NFS: Fix up a sparse warning")
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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Again we have claimed regressions for walking a directory tree, this time
with the "find" utility which always tries to optimize away asking for any
attributes until it has a complete list of entries. This behavior makes
the readdir plus heuristic do the wrong thing, which causes a storm of
GETATTRs to determine each entry's type in order to continue the walk.
For v4 add the type attribute to each READDIR request to include it no
matter the heuristic. This allows a simple `find` command to proceed
quickly through a directory tree.
Suggested-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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We noticed a SCSI device that refused to allow READ CAPACITY when the
device had a PR with exclusive access, registrants only. The result of
this situation is that the blocklayout driver adds a pnfs_block_dev of zero
length which always fails the offset_in_map tests. Instead of continuously
trying to do pNFS for this case, just mark the device as unavailable which
will allow the client to fallback to the MDS for the duration of
PNFS_DEVICE_RETRY_TIMEOUT.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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The error path for blocklayout's device lookup is missing a reference drop
for the case where a lookup finds the device, but the device is marked with
NFS_DEVICEID_UNAVAILABLE.
Fixes: b3dce6a2f060 ("pnfs/blocklayout: handle transient devices")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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Merge an ACPI power management change, ACPI backlight driver changes, APEI
updates and ACPI extlog driver changes for 6.8-rc1:
- Modify the ACPI LPIT table handling code to avoid u32 multiplication
overflows in state residency computations (Nikita Kiryushin).
- Drop an unused helper function from the ACPI backlight (video) driver
and add a clarifying comment to it (Hans de Goede).
- Update the ACPI backlight driver to avoid using uninitialized memory
in some cases (Nikita Kiryushin).
- Add ACPI backlight quirk for the Colorful X15 AT 23 laptop (Yuluo
Qiu).
- Add support for vendor-defined error types to the ACPI APEI error
injection code (Avadhut Naik).
- Adjust APEI to properly set MF_ACTION_REQUIRED on synchronous memory
failure events, so they are handled differently from the asynchronous
ones (Shuai Xue).
- Fix NULL pointer dereference check in the ACPI extlog driver (Prarit
Bhargava).
- Adjust the ACPI extlog driver to clear the Extended Error Log status
when RAS_CEC handled the error (Tony Luck).
* acpi-pm:
ACPI: LPIT: Avoid u32 multiplication overflow
* acpi-video:
ACPI: video: Add quirk for the Colorful X15 AT 23 Laptop
ACPI: video: check for error while searching for backlight device parent
ACPI: video: Drop should_check_lcd_flag()
ACPI: video: Add comment about acpi_video_backlight_use_native() usage
* acpi-apei:
ACPI: APEI: set memory failure flags as MF_ACTION_REQUIRED on synchronous events
ACPI: APEI: EINJ: Add support for vendor defined error types
platform/chrome: cros_ec_debugfs: Fix permissions for panicinfo
fs: debugfs: Add write functionality to debugfs blobs
ACPI: APEI: EINJ: Refactor available_error_type_show()
* acpi-extlog:
ACPI: extlog: Clear Extended Error Log status when RAS_CEC handled the error
ACPI: extlog: fix NULL pointer dereference check
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git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull tracing fixes from Steven Rostedt:
- Fix a NULL kernel dereference in set_gid() on tracefs mounting.
When tracefs is mounted with "gid=1000", it will update the existing
dentries to have the new gid. The tracefs_inode which is retrieved by
a container_of(dentry->d_inode) has flags to see if the inode belongs
to the eventfs system.
The issue that was fixed was if getdents() was called on tracefs that
was previously mounted, and was not closed. It will leave a "cursor
dentry" in the subdirs list of the current dentries that set_gid()
walks. On a remount of tracefs, the container_of(dentry->d_inode)
will dereference a NULL pointer and cause a crash when referenced.
Simply have a check for dentry->d_inode to see if it is NULL and if
so, skip that entry.
- Fix the bits of the eventfs_inode structure.
The "is_events" bit was taken from the nr_entries field, but the
nr_entries field wasn't updated to be 30 bits and was still 31.
Including the "is_freed" bit this would use 33 bits which would make
the structure use another integer for just one bit.
* tag 'trace-v6.7-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
eventfs: Fix bitwise fields for "is_events"
tracefs: Check for dentry->d_inode exists in set_gid()
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A flag was needed to denote which eventfs_inode was the "events"
directory, so a bit was taken from the "nr_entries" field, as there's not
that many entries, and 2^30 is plenty. But the bit number for nr_entries
was not updated to reflect the bit taken from it, which would add an
unnecessary integer to the structure.
Link: https://lore.kernel.org/linux-trace-kernel/20240102151832.7ca87275@gandalf.local.home
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Fixes: 7e8358edf503e ("eventfs: Fix file and directory uid and gid ownership")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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If a getdents() is called on the tracefs directory but does not get all
the files, it can leave a "cursor" dentry in the d_subdirs list of tracefs
dentry. This cursor dentry does not have a d_inode for it. Before
referencing tracefs_inode from the dentry, the d_inode must first be
checked if it has content. If not, then it's not a tracefs_inode and can
be ignored.
The following caused a crash:
#define getdents64(fd, dirp, count) syscall(SYS_getdents64, fd, dirp, count)
#define BUF_SIZE 256
#define TDIR "/tmp/file0"
int main(void)
{
char buf[BUF_SIZE];
int fd;
int n;
mkdir(TDIR, 0777);
mount(NULL, TDIR, "tracefs", 0, NULL);
fd = openat(AT_FDCWD, TDIR, O_RDONLY);
n = getdents64(fd, buf, BUF_SIZE);
ret = mount(NULL, TDIR, NULL, MS_NOSUID|MS_REMOUNT|MS_RELATIME|MS_LAZYTIME,
"gid=1000");
return 0;
}
That's because the 256 BUF_SIZE was not big enough to read all the
dentries of the tracefs file system and it left a "cursor" dentry in the
subdirs of the tracefs root inode. Then on remounting with "gid=1000",
it would cause an iteration of all dentries which hit:
ti = get_tracefs(dentry->d_inode);
if (ti && (ti->flags & TRACEFS_EVENT_INODE))
eventfs_update_gid(dentry, gid);
Which crashed because of the dereference of the cursor dentry which had a NULL
d_inode.
In the subdir loop of the dentry lookup of set_gid(), if a child has a
NULL d_inode, simply skip it.
Link: https://lore.kernel.org/all/20240102135637.3a21fb10@gandalf.local.home/
Link: https://lore.kernel.org/linux-trace-kernel/20240102151249.05da244d@gandalf.local.home
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Fixes: 7e8358edf503e ("eventfs: Fix file and directory uid and gid ownership")
Reported-by: "Ubisectech Sirius" <bugreport@ubisectech.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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The kernel thread function jfs_lazycommit() and jfs_sync() invoke the
try_to_freeze() in its loop. But all the kernel threads are no-freezable
by default. So if we want to make a kernel thread to be freezable, we have
to invoke set_freezable() explicitly.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
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[Syz report]
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_imap.c:2360:2
index -878706688 is out of range for type 'struct iagctl[128]'
CPU: 1 PID: 5065 Comm: syz-executor282 Not tainted 6.7.0-rc4-syzkaller-00009-gbee0e7762ad2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
ubsan_epilogue lib/ubsan.c:217 [inline]
__ubsan_handle_out_of_bounds+0x11c/0x150 lib/ubsan.c:348
diNewExt+0x3cf3/0x4000 fs/jfs/jfs_imap.c:2360
diAllocExt fs/jfs/jfs_imap.c:1949 [inline]
diAllocAG+0xbe8/0x1e50 fs/jfs/jfs_imap.c:1666
diAlloc+0x1d3/0x1760 fs/jfs/jfs_imap.c:1587
ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56
jfs_mkdir+0x1c5/0xb90 fs/jfs/namei.c:225
vfs_mkdir+0x2f1/0x4b0 fs/namei.c:4106
do_mkdirat+0x264/0x3a0 fs/namei.c:4129
__do_sys_mkdir fs/namei.c:4149 [inline]
__se_sys_mkdir fs/namei.c:4147 [inline]
__x64_sys_mkdir+0x6e/0x80 fs/namei.c:4147
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fcb7e6a0b57
Code: ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd83023038 EFLAGS: 00000286 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fcb7e6a0b57
RDX: 00000000000a1020 RSI: 00000000000001ff RDI: 0000000020000140
RBP: 0000000020000140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 00007ffd830230d0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[Analysis]
When the agstart is too large, it can cause agno overflow.
[Fix]
After obtaining agno, if the value is invalid, exit the subsequent process.
Reported-and-tested-by: syzbot+553d90297e6d2f50dbc7@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Modified the test from agno > MAXAG to agno >= MAXAG based on linux-next
report by kernel test robot (Dan Carpenter).
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
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Now that we have dynamically resizable btree paths,
check_directory_structure() can check one path - inode up to the root -
in a single transaction.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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reattach_inode() was broken w.r.t. snapshots - we'd lookup the subvolume
to look up lost+found, but if we're in an interior node snapshot that
didn't make any sense.
Instead, this adds a dirent path for creating in a specific snapshot,
skipping the subvolume; and we also make sure to create lost+found in
the root snapshot, to avoid conflicts with lost+found being created in
overlapping snapshots.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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refactoring the BTREE_ITER_WITH_UPDATES code, prep for removing the flag
and making it always-on
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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bch2_btree_iter_peek_prev() now supports BTREE_ITER_WITH_UPDATES
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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refactoring the BTREE_ITER_WITH_UPDATES code, prep for removing the flag
and making it always-on
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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XXX: we're allocating memory with btree locks held - bad
We need to plumb through an error path so we can do
allocate_dropping_locks() - but we're merging this now because it fixes
a transaction path overflow caused by indirect extent fragmentation, and
the resize path is rare.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Since the btree_paths array is now about to become growable, we have to
be careful not to refer to paths by pointer across contexts where they
may be reallocated.
This fixes the remaining btree_interior_update() paths - split and
merge.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Start to plumb through dynamically growable btree_paths; this patch
replaces most BTREE_ITER_MAX references with trans->nr_paths.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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the reflink triggers are also bumping up against the maximum number of
paths in a transaction - and generating proportional numbers of updates.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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- Some tweaks to greatly reduce locking overhead for the list of btree
transactions, so that it can always be enabled: leave btree_trans
objects on the list when they're on the percpu single item freelist,
and only check for duplicates in the same process when
CONFIG_BCACHEFS_DEBUG is enabled
- don't zero out the full btree_trans() unless we allocated it from
the mempool
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Upcoming patches are going to be changing trans->paths to a
reallocatable buffer. We need to guard against use after free when it's
used by other threads; this introduces RCU protection to those paths and
changes them to check for trans->paths == NULL
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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path->idx is now a code smell: we should be using path_idx_t, since it's
stable across btree path reallocation.
This is also a bit faster, using the same loop counter vs. fetching
path->idx from each path we iterate over.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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dead code
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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reducing our usage of path->idx
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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