ubifs: Convert populate_page() to take a folio

Both callers now have a folio, so pass it in. This function contains
several assumptions that folios are not large.

Signed-off-by: Matthew Wilcox (Or

ubifs: Convert populate_page() to take a folio

Both callers now have a folio, so pass it in. This function contains
several assumptions that folios are not large.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Use a folio in ubifs_do_bulk_read()

When looking in the page cache, retrieve a folio instead of a page.
This would need some work to make it safe for large folios.

Signed-off-by: Matthew Wil

ubifs: Use a folio in ubifs_do_bulk_read()

When looking in the page cache, retrieve a folio instead of a page.
This would need some work to make it safe for large folios.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Pass a folio into ubifs_bulk_read() and ubifs_do_bulk_read()

This saves a single call to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Che

ubifs: Pass a folio into ubifs_bulk_read() and ubifs_do_bulk_read()

This saves a single call to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert cancel_budget() to take a folio

The one caller already has a folio, so pass it in instead of the page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhiha

ubifs: Convert cancel_budget() to take a folio

The one caller already has a folio, so pass it in instead of the page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert allocate_budget() to work on a folio

The one caller has a folio, so pass it in instead of the page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao C

ubifs: Convert allocate_budget() to work on a folio

The one caller has a folio, so pass it in instead of the page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert do_readpage() to take a folio

All the callers now have a folio, so pass it in, and convert do_readpage()
to us folios directly. Includes unifying the exit paths from this
function an

ubifs: Convert do_readpage() to take a folio

All the callers now have a folio, so pass it in, and convert do_readpage()
to us folios directly. Includes unifying the exit paths from this
function and using kmap_local instead of plain kmap. This function
should now work with large folios, but this is not tested.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert ubifs_write_end() to use a folio

Convert the incoming page pointer to a folio and use it throughout,
saving several calls to compound_head(). Also remove some PAGE_SIZE
assumptions.

ubifs: Convert ubifs_write_end() to use a folio

Convert the incoming page pointer to a folio and use it throughout,
saving several calls to compound_head(). Also remove some PAGE_SIZE
assumptions.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert ubifs_write_begin() to use a folio

Save eight calls to compound_head() by using the new folio API.
Remove a few assumptions that would break with large folios.

Signed-off-by: Matthew

ubifs: Convert ubifs_write_begin() to use a folio

Save eight calls to compound_head() by using the new folio API.
Remove a few assumptions that would break with large folios.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert write_begin_slow() to use a folio

Update to new APIs, removing several calls to compound_head() and
including support for large folios.

Signed-off-by: Matthew Wilcox (Oracle) <willy@

ubifs: Convert write_begin_slow() to use a folio

Update to new APIs, removing several calls to compound_head() and
including support for large folios.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert ubifs_vm_page_mkwrite() to use a folio

Replace six implicit calls to compound_head() with one.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng

ubifs: Convert ubifs_vm_page_mkwrite() to use a folio

Replace six implicit calls to compound_head() with one.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert do_writepage() to take a folio

Replace the call to SetPageError() with a call to mapping_set_error().
Support large folios by using kmap_local_folio() and remapping each time
we cross

ubifs: Convert do_writepage() to take a folio

Replace the call to SetPageError() with a call to mapping_set_error().
Support large folios by using kmap_local_folio() and remapping each time
we cross a page boundary. Saves a lot of hidden calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Use a folio in do_truncation()

Convert from the old page APIs to the new folio APIs which saves
a few hidden calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead

ubifs: Use a folio in do_truncation()

Convert from the old page APIs to the new folio APIs which saves
a few hidden calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert ubifs_writepage to use a folio

We still pass the page down to do_writepage(), but ubifs_writepage()
itself is now large folio safe. It also contains far fewer hidden calls
to compoun

ubifs: Convert ubifs_writepage to use a folio

We still pass the page down to do_writepage(), but ubifs_writepage()
itself is now large folio safe. It also contains far fewer hidden calls
to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Convert from writepage to writepages

This is a simplistic conversion to separate out any effects of
no longer having a writepage method.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infrade

ubifs: Convert from writepage to writepages

This is a simplistic conversion to separate out any effects of
no longer having a writepage method.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Set page uptodate in the correct place

Page cache reads are lockless, so setting the freshly allocated page
uptodate before we've overwritten it with the data it's supposed to have
in it will

ubifs: Set page uptodate in the correct place

Page cache reads are lockless, so setting the freshly allocated page
uptodate before we've overwritten it with the data it's supposed to have
in it will allow a simultaneous reader to see old data. Move the call
to SetPageUptodate into ubifs_write_end(), which is after we copied the
new data into the page.

Fixes: 1e51764a3c2a ("UBIFS: add new flash file system")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: fix kernel-doc warnings

Fix kernel-doc warnings found when using "W=1".

file.c:1385: warning: Excess function parameter 'time' description in 'ubifs_update_time'
and 9 warnings like this one

ubifs: fix kernel-doc warnings

Fix kernel-doc warnings found when using "W=1".

file.c:1385: warning: Excess function parameter 'time' description in 'ubifs_update_time'
and 9 warnings like this one:
file.c:326: warning: No description found for return value of 'allocate_budget'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202312030417.66c5PwHj-lkp@intel.com/
Cc: Richard Weinberger <richard@nod.at>
Cc: linux-mtd@lists.infradead.org
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
[rw: massaged patch to resolve conflict ]
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: Fix some kernel-doc comments

Add description of @time and @flags in ubifs_update_time().

to silence the warnings:
fs/ubifs/file.c:1383: warning: Function parameter or member 'time' not descr

ubifs: Fix some kernel-doc comments

Add description of @time and @flags in ubifs_update_time().

to silence the warnings:
fs/ubifs/file.c:1383: warning: Function parameter or member 'time' not described in 'ubifs_update_time'
fs/ubifs/file.c:1383: warning: Function parameter or member 'flags' not described in 'ubifs_update_time'

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5848
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: convert to new timestamp accessors

Convert to using the new inode timestamp accessor functions.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20231004185347

ubifs: convert to new timestamp accessors

Convert to using the new inode timestamp accessor functions.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20231004185347.80880-71-jlayton@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

show more ...

fs: drop the timespec64 argument from update_time

Now that all of the update_time operations are prepared for it, we can
drop the timespec64 argument from the update_time operation. Do that and
remo

fs: drop the timespec64 argument from update_time

Now that all of the update_time operations are prepared for it, we can
drop the timespec64 argument from the update_time operation. Do that and
remove it from some associated functions like inode_update_time and
inode_needs_update_time.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Message-Id: <20230807-mgctime-v7-8-d1dec143a704@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

show more ...

ubifs: have ubifs_update_time use inode_update_timestamps

In later patches, we're going to drop the "now" parameter from the
update_time operation. Prepare ubifs for this, by having it use the new
i

ubifs: have ubifs_update_time use inode_update_timestamps

In later patches, we're going to drop the "now" parameter from the
update_time operation. Prepare ubifs for this, by having it use the new
inode_update_timestamps helper.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Message-Id: <20230807-mgctime-v7-6-d1dec143a704@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

show more ...

fs: drop the timespec64 arg from generic_update_time

In future patches we're going to change how the ctime is updated
to keep track of when it has been queried. The way that the update_time
operatio

fs: drop the timespec64 arg from generic_update_time

In future patches we're going to change how the ctime is updated
to keep track of when it has been queried. The way that the update_time
operation works (and a lot of its callers) make this difficult, since
they grab a timestamp early and then pass it down to eventually be
copied into the inode.

All of the existing update_time callers pass in the result of
current_time() in some fashion. Drop the "time" parameter from
generic_update_time, and rework it to fetch its own timestamp.

This change means that an update_time could fetch a different timestamp
than was seen in inode_needs_update_time. update_time is only ever
called with one of two flag combinations: Either S_ATIME is set, or
S_MTIME|S_CTIME|S_VERSION are set.

With this change we now treat the flags argument as an indicator that
some value needed to be updated when last checked, rather than an
indication to update specific timestamps.

Rework the logic for updating the timestamps and put it in a new
inode_update_timestamps helper that other update_time routines can use.
S_ATIME is as treated as we always have, but if any of the other three
are set, then we attempt to update all three.

Also, some callers of generic_update_time need to know what timestamps
were actually updated. Change it to return an S_* flag mask to indicate
that and rework the callers to expect it.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Message-Id: <20230807-mgctime-v7-3-d1dec143a704@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

show more ...

ubifs: convert to ctime accessor functions

In later patches, we're going to change how the inode's ctime field is
used. Switch to using accessor functions instead of raw accesses of
inode->i_ctime.

ubifs: convert to ctime accessor functions

In later patches, we're going to change how the inode's ctime field is
used. Switch to using accessor functions instead of raw accesses of
inode->i_ctime.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Message-Id: <20230705190309.579783-76-jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

show more ...

splice: Use filemap_splice_read() instead of generic_file_splice_read()

Replace pointers to generic_file_splice_read() with calls to
filemap_splice_read().

Signed-off-by: David Howells <dhowells@re

splice: Use filemap_splice_read() instead of generic_file_splice_read()

Replace pointers to generic_file_splice_read() with calls to
filemap_splice_read().

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
cc: Jens Axboe <axboe@kernel.dk>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: David Hildenbrand <david@redhat.com>
cc: John Hubbard <jhubbard@nvidia.com>
cc: linux-mm@kvack.org
cc: linux-block@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/20230522135018.2742245-29-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

show more ...

ubifs: ubifs_releasepage: Remove ubifs_assert(0) to valid this process

There are two states for ubifs writing pages:
1. Dirty, Private
2. Not Dirty, Not Private

The normal process cannot go to ubif

ubifs: ubifs_releasepage: Remove ubifs_assert(0) to valid this process

There are two states for ubifs writing pages:
1. Dirty, Private
2. Not Dirty, Not Private

The normal process cannot go to ubifs_releasepage() which means there
exists pages being private but not dirty. Reproducer[1] shows that it
could occur (which maybe related to [2]) with following process:

PA PB PC
lock(page)[PA]
ubifs_write_end
attach_page_private // set Private
__set_page_dirty_nobuffers // set Dirty
unlock(page)

write_cache_pages[PA]
lock(page)
clear_page_dirty_for_io(page) // clear Dirty
ubifs_writepage

do_truncation[PB]
truncate_setsize
i_size_write(inode, newsize) // newsize = 0

i_size = i_size_read(inode) // i_size = 0
end_index = i_size >> PAGE_SHIFT
if (page->index > end_index)
goto out // jump
out:
unlock(page) // Private, Not Dirty

generic_fadvise[PC]
lock(page)
invalidate_inode_page
try_to_release_page
ubifs_releasepage
ubifs_assert(c, 0)
// bad assertion!
unlock(page)
truncate_pagecache[PB]

Then we may get following assertion failed:
UBIFS error (ubi0:0 pid 1683): ubifs_assert_failed [ubifs]:
UBIFS assert failed: 0, in fs/ubifs/file.c:1513
UBIFS warning (ubi0:0 pid 1683): ubifs_ro_mode [ubifs]:
switched to read-only mode, error -22
CPU: 2 PID: 1683 Comm: aa Not tainted 5.16.0-rc5-00184-g0bca5994cacc-dirty #308
Call Trace:
dump_stack+0x13/0x1b
ubifs_ro_mode+0x54/0x60 [ubifs]
ubifs_assert_failed+0x4b/0x80 [ubifs]
ubifs_releasepage+0x67/0x1d0 [ubifs]
try_to_release_page+0x57/0xe0
invalidate_inode_page+0xfb/0x130
__invalidate_mapping_pages+0xb9/0x280
invalidate_mapping_pagevec+0x12/0x20
generic_fadvise+0x303/0x3c0
ksys_fadvise64_64+0x4c/0xb0

[1] https://bugzilla.kernel.org/show_bug.cgi?id=215373
[2] https://linux-mtd.infradead.narkive.com/NQoBeT1u/patch-rfc-ubifs-fix-assert-failed-in-ubifs-set-page-dirty

Fixes: 1e51764a3c2ac0 ("UBIFS: add new flash file system")
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...

ubifs: ubifs_writepage: Mark page dirty after writing inode failed

There are two states for ubifs writing pages:
1. Dirty, Private
2. Not Dirty, Not Private

There is a third possibility which maybe

ubifs: ubifs_writepage: Mark page dirty after writing inode failed

There are two states for ubifs writing pages:
1. Dirty, Private
2. Not Dirty, Not Private

There is a third possibility which maybe related to [1] that page is
private but not dirty caused by following process:

PA
lock(page)
ubifs_write_end
attach_page_private // set Private
__set_page_dirty_nobuffers // set Dirty
unlock(page)

write_cache_pages
lock(page)
clear_page_dirty_for_io(page) // clear Dirty
ubifs_writepage
write_inode
// fail, goto out, following codes are not executed
// do_writepage
// set_page_writeback // set Writeback
// detach_page_private // clear Private
// end_page_writeback // clear Writeback
out:
unlock(page) // Private, Not Dirty

PB
ksys_fadvise64_64
generic_fadvise
invalidate_inode_page
// page is neither Dirty nor Writeback
invalidate_complete_page
// page_has_private is true
try_to_release_page
ubifs_releasepage
ubifs_assert(c, 0) !!!

Then we may get following assertion failed:
UBIFS error (ubi0:0 pid 1492): ubifs_assert_failed [ubifs]:
UBIFS assert failed: 0, in fs/ubifs/file.c:1499
UBIFS warning (ubi0:0 pid 1492): ubifs_ro_mode [ubifs]:
switched to read-only mode, error -22
CPU: 2 PID: 1492 Comm: aa Not tainted 5.16.0-rc2-00012-g7bb767dee0ba-dirty
Call Trace:
dump_stack+0x13/0x1b
ubifs_ro_mode+0x54/0x60 [ubifs]
ubifs_assert_failed+0x4b/0x80 [ubifs]
ubifs_releasepage+0x7e/0x1e0 [ubifs]
try_to_release_page+0x57/0xe0
invalidate_inode_page+0xfb/0x130
invalidate_mapping_pagevec+0x12/0x20
generic_fadvise+0x303/0x3c0
vfs_fadvise+0x35/0x40
ksys_fadvise64_64+0x4c/0xb0

Jump [2] to find a reproducer.

[1] https://linux-mtd.infradead.narkive.com/NQoBeT1u/patch-rfc-ubifs-fix-assert-failed-in-ubifs-set-page-dirty
[2] https://bugzilla.kernel.org/show_bug.cgi?id=215357

Fixes: 1e51764a3c2ac0 ("UBIFS: add new flash file system")
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

show more ...