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Currently, ext4_mb_get_buddy_page_lock() uses blocks_per_page to calculate
folio index and offset. However, when blocksize is larger than PAGE_SIZE,
blocks_per_page becomes zero, leading to a potential division-by-zero bug.
To support BS > PS, use bytes to compute folio index and offset within
folio to get rid of blocks_per_page.
Also, since ext4_mb_get_buddy_page_lock() already fully supports folio,
rename it to ext4_mb_get_buddy_folio_lock().
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-13-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Currently, ext4_mb_load_buddy_gfp() uses blocks_per_page to calculate the
folio index and offset. However, when blocksize is larger than PAGE_SIZE,
blocks_per_page becomes zero, leading to a potential division-by-zero bug.
To support BS > PS, use bytes to compute folio index and offset within
folio to get rid of blocks_per_page.
Also, if buddy and bitmap land in the same folio, we get that folio’s ref
instead of looking it up again before updating the buddy.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-12-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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As BS > PS support is coming, all block number to page index (and
vice-versa) conversions must now go via bytes. Added EXT4_LBLK_TO_PG()
and EXT4_PG_TO_LBLK() macros to simplify these conversions and handle
both BS <= PS and BS > PS scenarios cleanly.
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-11-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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No functional changes.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-10-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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In ext4_readdir(), page_cache_sync_readahead() is used to readahead mapped
physical blocks. With LBS support, this can lead to a negative right shift.
To fix this, the page index is now calculated by first converting the
physical block number (pblk) to a file position (pos) before converting
it to a page index. Also, the correct number of pages to readahead is now
passed.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Pankaj Raghav <p.raghav@samsung.com>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-9-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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ext4_calculate_overhead() used a single page for its bitmap buffer, which
worked fine when PAGE_SIZE >= block size. However, with block size greater
than page size (BS > PS) support, the bitmap can exceed a single page.
To address this, we now use kvmalloc() to allocate memory of the filesystem
block size, to properly support BS > PS.
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-8-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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This commit introduces the s_min_folio_order field to the ext4_sb_info
structure. This field will store the minimum folio order required by the
current filesystem, laying groundwork for future support of block sizes
greater than PAGE_SIZE.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Pankaj Raghav <p.raghav@samsung.com>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-7-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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The dioread_nolock related processes already support large folio, so
dioread_nolock is enabled by default regardless of whether the blocksize
is less than, equal to, or greater than PAGE_SIZE.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-6-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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When preparing for bs > ps support, clean up unnecessary PAGE_SIZE
references in ext4_punch_hole().
Previously, when a hole extended beyond i_size, we aligned the hole end
upwards to PAGE_SIZE to handle partial folio invalidation. Now that
truncate_inode_pages_range() already handles partial folio invalidation
correctly, this alignment is no longer required.
However, to save pointless tail block zeroing, we still keep rounding up
to the block size here.
In addition, as Honza pointed out, when the hole end equals i_size, it
should also be rounded up to the block size. This patch fixes that as well.
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-5-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Previously, ext4_rec_len_(to|from)_disk only performed complex rec_len
conversions when PAGE_SIZE >= 65536 to reduce complexity.
However, we are soon to support file system block sizes greater than
page size, which makes these conditional checks unnecessary. Thus, these
checks are now removed.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-4-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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For bs <= ps scenarios, calculating the offset within the block is
sufficient. For bs > ps, an initial page offset calculation can lead to
incorrect behavior. Thus this redundant calculation has been removed.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-3-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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For bs <= ps scenarios, calculating the offset within the block is
sufficient. For bs > ps, an initial page offset calculation can lead to
incorrect behavior. Thus this redundant calculation has been removed.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-2-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Fix an uninitialised variable (key) in afs_alloc_anon_key() by setting it
to cell->anonymous_key. Without this change, the error check may return a
false failure with a bad error number.
Most of the time this is unlikely to happen because the first encounter
with afs_alloc_anon_key() will usually be from (auto)mount, for which all
subsequent operations must wait - apart from other (auto)mounts. Once the
call->anonymous_key is allocated, all further calls to afs_request_key()
will skip the call to afs_alloc_anon_key() for that cell.
Fixes: d27c71257825 ("afs: Fix delayed allocation of a cell's anonymous key")
Reported-by: Paulo Alcantra <pc@manguebit.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Paulo Alcantara <pc@manguebit.org>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: syzbot+41c68824eefb67cdf00c@syzkaller.appspotmail.com
cc: linux-afs@lists.infradead.org
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Remove array_size() calls and replace vmalloc() with vmalloc_array() in
ubifs_create_dflt_lpt()/lpt_init_rd()/lpt_init_wr(). vmalloc_array() is
optimized better, resulting in less instructions being used [1].
[1]: https://lore.kernel.org/lkml/abc66ec5-85a4-47e1-9759-2f60ab111971@vivo.com/
Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
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When an error occurs, ubifs_err is used to directly print the error,
and different errors have different formats for printing. Therefore,
it's not necessary to use 'err' to locate the error occurrence.
Thus, remove the relevant assignments to 'err'.
Signed-off-by: Xichao Zhao <zhao.xichao@vivo.com>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
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Replace part of the code using ubifs_crc_node.
Signed-off-by: Xichao Zhao <zhao.xichao@vivo.com>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
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Because the variable *c is not used within the function,
remove it from the ubifs_crc_node function.
Signed-off-by: Xichao Zhao <zhao.xichao@vivo.com>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
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git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull vfs fixes from Christian Brauner:
- afs: Fix delayed allocation of a cell's anonymous key
The allocation of a cell's anonymous key is done in a background
thread along with other cell setup such as doing a DNS upcall. The
normal key lookup tries to use the key description on the anonymous
authentication key as the reference for request_key() - but it may
not yet be set, causing an oops
- ovl: fail ovl_lock_rename_workdir() if either target is unhashed
As well as checking that the parent hasn't changed after getting the
lock, the code needs to check that the dentry hasn't been unhashed.
Otherwise overlayfs might try to rename something that has been
removed
- namespace: fix a reference leak in grab_requested_mnt_ns
lookup_mnt_ns() already takes a reference on mnt_ns, and so
grab_requested_mnt_ns() doesn't need to take an extra reference
* tag 'vfs-6.18-rc8.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
afs: Fix delayed allocation of a cell's anonymous key
ovl: fail ovl_lock_rename_workdir() if either target is unhashed
fs/namespace: fix reference leak in grab_requested_mnt_ns
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Enable propagation of detailed errors to callers.
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
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Enable better, more detailed, and unique error reporting.
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
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Change the return type of decompress() from `int` to `const char *` to
provide more informative error diagnostics:
- A NULL return indicates successful decompression;
- If IS_ERR(ptr) is true, the return value encodes a standard negative
errno (e.g., -ENOMEM, -EOPNOTSUPP) identifying the specific error;
- Otherwise, a non-NULL return points to a human-readable error string,
and the corresponding error code should be treated as -EFSCORRUPTED.
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
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- Add some useful comments to explain inplace I/Os and decompression;
- Rearrange the code to get rid of one unnecessary goto.
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-44-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-21-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-17-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-16-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-15-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-14-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-13-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-12-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-11-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-10-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-9-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner <brauner@kernel.org> says:
The fix sent in [1] was squashed into this commit.
Link: https://lore.kernel.org/20251127201618.2115275-1-kuniyu@google.com [1]
Reported-by: syzbot+321168dfa622eda99689@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/lkml/6928b121.a70a0220.d98e3.0110.GAE@google.com
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-8-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner <brauner@kernel.org> says:
A variant of the fix sent in [1] was squashed into this commit.
Link: https://lore.kernel.org/20251128035149.392402-1-kartikey406@gmail.com [1]
Reported-by: Deepanshu Kartikey <kartikey406@gmail.com>
Reported-by: syzbot+94048264da5715c251f9@syzkaller.appspotmail.com
Tested-by: syzbot+94048264da5715c251f9@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=94048264da5715c251f9
Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-7-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-6-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-5-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-4-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-3-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Link: https://patch.msgid.link/20251123-work-fd-prepare-v4-2-b6efa1706cfd@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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The allocation of a cell's anonymous key is done in a background thread
along with other cell setup such as doing a DNS upcall. In the reported
bug, this is triggered by afs_parse_source() parsing the device name given
to mount() and calling afs_lookup_cell() with the name of the cell.
The normal key lookup then tries to use the key description on the
anonymous authentication key as the reference for request_key() - but it
may not yet be set and so an oops can happen.
This has been made more likely to happen by the fix for dynamic lookup
failure.
Fix this by firstly allocating a reference name and attaching it to the
afs_cell record when the record is created. It can share the memory
allocation with the cell name (unfortunately it can't just overlap the cell
name by prepending it with "afs@" as the cell name already has a '.'
prepended for other purposes). This reference name is then passed to
request_key().
Secondly, the anon key is now allocated on demand at the point a key is
requested in afs_request_key() if it is not already allocated. A mutex is
used to prevent multiple allocation for a cell.
Thirdly, make afs_request_key_rcu() return NULL if the anonymous key isn't
yet allocated (if we need it) and then the caller can return -ECHILD to
drop out of RCU-mode and afs_request_key() can be called.
Note that the anonymous key is kind of necessary to make the key lookup
cache work as that doesn't currently cache a negative lookup, but it's
probably worth some investigation to see if NULL can be used instead.
Fixes: 330e2c514823 ("afs: Fix dynamic lookup to fail on cell lookup failure")
Reported-by: syzbot+41c68824eefb67cdf00c@syzkaller.appspotmail.com
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/800328.1764325145@warthog.procyon.org.uk
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Remove unnecessary semicolons reported by Coccinelle/coccicheck and the
semantic patch at scripts/coccinelle/misc/semicolon.cocci.
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Fixed: 7ab96df840e60 ("VFS/nfsd/cachefiles/ovl: add start_creating() and end_creating()")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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As well as checking that the parent hasn't changed after getting the
lock we need to check that the dentry hasn't been unhashed.
Otherwise we might try to rename something that has been removed.
Reported-by: syzbot+bfc9a0ccf0de47d04e8c@syzkaller.appspotmail.com
Fixes: d2c995581c7c ("ovl: Call ovl_create_temp() without lock held.")
Signed-off-by: NeilBrown <neil@brown.name>
Link: https://patch.msgid.link/176429295510.634289.1552337113663461690@noble.neil.brown.name
Tested-by: syzbot+bfc9a0ccf0de47d04e8c@syzkaller.appspotmail.com
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Rationale is that if the parent dentry is the same and the length is the
same, then you have to be unlucky for the name to not match.
At the same time the dentry was literally just found on the hash, so you
have to be even more unlucky to determine it is unhashed.
While here add commentary while d_unhashed() is necessary. It was
already removed once and brought back in:
2e321806b681b192 ("Revert "vfs: remove unnecessary d_unhashed() check from __d_lookup_rcu"")
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://patch.msgid.link/20251127131526.4137768-1-mjguzik@gmail.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Use the correct function name and add description for the @flavor
parameter to avoid these kernel-doc warnings:
Warning: fs/locks.c:1706 function parameter 'flavor' not described in
'__fcntl_getlease'
WARNING: fs/locks.c:1706 expecting prototype for fcntl_getlease().
Prototype was for __fcntl_getlease() instead
Fixes: 1602bad16d7d ("vfs: expose delegation support to userland")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20251128000826.457120-1-rdunlap@infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Avoid a double-unlock as nfs_create_locked() will have unlocked the
parent and do the dput() manually.
Christian Brauner <brauner@kernel.org> says:
I've taken Neil's proposed fix from [1] and added a commit message.
Fixes: https://lore.kernel.org/202511252132.2c621407-lkp@intel.com [1]
Fixes: bd6ede8a06e8 ("VFS/nfsd/cachefiles/ovl: introduce start_removing() and end_removing()")
Signed-off-by: Neil Brown <neil@brown.name>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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to merge "kho: make debugfs interface optional" into mm-nonmm-stable.
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Conflicts:
net/xdp/xsk.c
0ebc27a4c67d ("xsk: avoid data corruption on cq descriptor number")
8da7bea7db69 ("xsk: add indirect call for xsk_destruct_skb")
30ed05adca4a ("xsk: use a smaller new lock for shared pool case")
https://lore.kernel.org/20251127105450.4a1665ec@canb.auug.org.au
https://lore.kernel.org/eb4eee14-7e24-4d1b-b312-e9ea738fefee@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Pull ceph fixes from Ilya Dryomov:
"A patch to make sparse read handling work in msgr2 secure mode from
Slava and a couple of fixes from Ziming and myself to avoid operating
on potentially invalid memory, all marked for stable"
* tag 'ceph-for-6.18-rc8' of https://github.com/ceph/ceph-client:
libceph: prevent potential out-of-bounds writes in handle_auth_session_key()
libceph: replace BUG_ON with bounds check for map->max_osd
ceph: fix crash in process_v2_sparse_read() for encrypted directories
libceph: drop started parameter of __ceph_open_session()
libceph: fix potential use-after-free in have_mon_and_osd_map()
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Make do_proc_douintvec static and export proc_douintvec_conv wrapper
function for external use. This is to keep with the design in sysctl.c.
Update fs/pipe.c to use the new public API.
Signed-off-by: Joel Granados <joel.granados@kernel.org>
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