1
Commit Graph

240 Commits

Author SHA1 Message Date
Matthew Wilcox (Oracle)
1da86618bd
fs: Convert aops->write_begin to take a folio
Convert all callers from working on a page to working on one page
of a folio (support for working on an entire folio can come later).
Removes a lot of folio->page->folio conversions.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2024-08-07 11:33:21 +02:00
Matthew Wilcox (Oracle)
a225800f32
fs: Convert aops->write_end to take a folio
Most callers have a folio, and most implementations operate on a folio,
so remove the conversion from folio->page->folio to fit through this
interface.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2024-08-07 11:32:02 +02:00
Jan Kara
8832fc1e50 udf: Fix lock ordering in udf_evict_inode()
udf_evict_inode() calls udf_setsize() to truncate deleted inode.
However inode deletion through udf_evict_inode() can happen from inode
reclaim context and udf_setsize() grabs mapping->invalidate_lock which
isn't generally safe to acquire from fs reclaim context since we
allocate pages under mapping->invalidate_lock for example in a page
fault path.  This is however not a real deadlock possibility as by the
time udf_evict_inode() is called, nobody can be accessing the inode,
even less work with its page cache. So this is just a lockdep triggering
false positive. Fix the problem by moving mapping->invalidate_lock
locking outsize of udf_setsize() into udf_setattr() as grabbing
mapping->invalidate_lock from udf_evict_inode() is pointless.

Reported-by: syzbot+0333a6f4b88bcd68a62f@syzkaller.appspotmail.com
Fixes: b9a861fd52 ("udf: Protect truncate and file type conversion with invalidate_lock")
Signed-off-by: Jan Kara <jack@suse.cz>
2024-06-05 10:36:46 +02:00
Jan Kara
c1f1b25a60 udf: Drop pointless IS_IMMUTABLE and IS_APPEND check
udf_setsize() checks for IS_IMMUTABLE and IS_APPEND flags. This is
however pointless as UDF does not have capability to store these flags
and never allows to set them. Furthermore this is the only place in UDF
code that was actually checking these flags. Remove the pointless check.

Signed-off-by: Jan Kara <jack@suse.cz>
2024-06-05 10:36:46 +02:00
Matthew Wilcox (Oracle)
e29741676f udf: Use a folio in udf_write_end()
Convert the page to a folio and use the folio APIs.  Replaces three
calls to compound_head() with one.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20240417150416.752929-8-willy@infradead.org>
2024-04-23 15:37:02 +02:00
Matthew Wilcox (Oracle)
d257d924a3 udf: Convert udf_adinicb_readpage() to udf_adinicb_read_folio()
Now that all three callers have a folio, convert this function to
take a folio, and use the folio APIs.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20240417150416.752929-5-willy@infradead.org>
2024-04-23 15:37:02 +02:00
Matthew Wilcox (Oracle)
db6754090a udf: Convert udf_expand_file_adinicb() to use a folio
Use the folio APIs throughout this function.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Fixes: 1eeceaec79 ("udf: Convert udf_expand_file_adinicb() to avoid kmap_atomic()")
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20240417150416.752929-4-willy@infradead.org>
2024-04-23 15:36:30 +02:00
Matthew Wilcox (Oracle)
d08f069cc2 udf: Convert udf_write_begin() to use a folio
Use the folio APIs throughout instead of the deprecated page APIs.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20240417150416.752929-3-willy@infradead.org>
2024-04-23 15:36:02 +02:00
Jan Kara
38f8af2a71 udf: Remove GFP_NOFS allocation in udf_expand_file_adinicb()
udf_expand_file_adinicb() is called under inode->i_rwsem and
mapping->invalidate_lock. i_rwsem is safe wrt fs reclaim,
invalidate_lock on this inode is safe as well (we hold inode reference
so reclaim will not touch it, furthermore even lockdep should not
complain as invalidate_lock is acquired from udf_evict_inode() only when
truncating inode which should not happen from fs reclaim).

Signed-off-by: Jan Kara <jack@suse.cz>
2024-01-23 19:21:10 +01:00
Jeff Layton
f972fed754
udf: 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/20231004185347.80880-72-jlayton@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
2023-10-18 14:08:28 +02:00
Linus Torvalds
1500e7e072 \n
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Merge tag 'for_v6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull ext2, quota, and udf updates from Jan Kara:

 - fixes for possible use-after-free issues with quota when racing with
   chown

 - fixes for ext2 crashing when xattr allocation races with another
   block allocation to the same file from page writeback code

 - fix for block number overflow in ext2

 - marking of reiserfs as obsolete in MAINTAINERS

 - assorted minor cleanups

* tag 'for_v6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  ext2: Fix kernel-doc warnings
  ext2: improve consistency of ext2_fsblk_t datatype usage
  ext2: dump current reservation window info
  ext2: fix race between setxattr and write back
  ext2: introduce new flags argument for ext2_new_blocks()
  ext2: remove ext2_new_block()
  ext2: fix datatype of block number in ext2_xattr_set2()
  udf: Drop pointless aops assignment
  quota: use lockdep_assert_held_write in dquot_load_quota_sb
  MAINTAINERS: change reiserfs status to obsolete
  udf: Fix -Wstringop-overflow warnings
  quota: simplify drop_dquot_ref()
  quota: fix dqput() to follow the guarantees dquot_srcu should provide
  quota: add new helper dquot_active()
  quota: rename dquot_active() to inode_quota_active()
  quota: factor out dquot_write_dquot()
  ext2: remove redundant assignment to variable desc and variable best_desc
2023-08-30 12:10:50 -07:00
Jan Kara
5ae6ca2cc1 udf: Drop pointless aops assignment
Since we have merged normal and in-ICB address_space operations, there's
no need to assign aops when expanding from in-ICB format.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-08-09 18:55:16 +02:00
Jeff Layton
59ad88f26e udf: 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: Jan Kara <jack@suse.cz>
Message-Id: <20230705190309.579783-77-jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2023-07-24 10:30:06 +02:00
Bagas Sanjaya
5ce345541e fs: udf: Replace GPL 2.0 boilerplate license notice with SPDX identifier
The notice refers to full GPL 2.0 text on now defunct MIT FTP site [1].
Replace it with appropriate SPDX license identifier.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Pali Rohár <pali@kernel.org>
Link: https://web.archive.org/web/20020809115410/ftp://prep.ai.mit.edu/pub/gnu/GPL [1]
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20230522005434.22133-2-bagasdotme@gmail.com>
2023-05-30 15:39:13 +02:00
Matthew Wilcox (Oracle)
96acbef66b udf: Use folios in udf_adinicb_writepage()
Make udf_adinicb_writepage() fully converted to using the passed folio
instead of converting it to the page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-03-08 18:55:25 +01:00
Jan Kara
63bceed808 udf: Warn if block mapping is done for in-ICB files
Now that address space operations are merge dfor in-ICB and normal
files, it is more likely some code mistakenly tries to map blocks for
in-ICB files. WARN and return error instead of silently returning
garbage.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-03-06 16:38:25 +01:00
Jan Kara
cecb1f0654 udf: Fix reading of in-ICB files
After merging address space operations of normal and in-ICB files,
readahead could get called for in-ICB files which resulted in
udf_get_block() being called for these files. udf_get_block() is not
prepared to be called for in-ICB files and ends up returning garbage
results as it interprets file data as extent list. Fix the problem by
skipping readahead for in-ICB files.

Fixes: 37a8a39f7a ("udf: Switch to single address_space_operations")
Signed-off-by: Jan Kara <jack@suse.cz>
2023-03-06 16:38:25 +01:00
Jan Kara
49854d3ccc udf: Fix lost writes in udf_adinicb_writepage()
The patch converting udf_adinicb_writepage() to avoid manually kmapping
the page used memcpy_to_page() however that copies in the wrong
direction (effectively overwriting file data with the old contents).
What we should be using is memcpy_from_page() to copy data from the page
into the inode and then mark inode dirty to store the data.

Fixes: 5cfc45321a ("udf: Convert udf_adinicb_writepage() to memcpy_to_page()")
Signed-off-by: Jan Kara <jack@suse.cz>
2023-03-06 16:38:25 +01:00
Linus Torvalds
3822a7c409 - Daniel Verkamp has contributed a memfd series ("mm/memfd: add
F_SEAL_EXEC") which permits the setting of the memfd execute bit at
   memfd creation time, with the option of sealing the state of the X bit.
 
 - Peter Xu adds a patch series ("mm/hugetlb: Make huge_pte_offset()
   thread-safe for pmd unshare") which addresses a rare race condition
   related to PMD unsharing.
 
 - Several folioification patch serieses from Matthew Wilcox, Vishal
   Moola, Sidhartha Kumar and Lorenzo Stoakes
 
 - Johannes Weiner has a series ("mm: push down lock_page_memcg()") which
   does perform some memcg maintenance and cleanup work.
 
 - SeongJae Park has added DAMOS filtering to DAMON, with the series
   "mm/damon/core: implement damos filter".  These filters provide users
   with finer-grained control over DAMOS's actions.  SeongJae has also done
   some DAMON cleanup work.
 
 - Kairui Song adds a series ("Clean up and fixes for swap").
 
 - Vernon Yang contributed the series "Clean up and refinement for maple
   tree".
 
 - Yu Zhao has contributed the "mm: multi-gen LRU: memcg LRU" series.  It
   adds to MGLRU an LRU of memcgs, to improve the scalability of global
   reclaim.
 
 - David Hildenbrand has added some userfaultfd cleanup work in the
   series "mm: uffd-wp + change_protection() cleanups".
 
 - Christoph Hellwig has removed the generic_writepages() library
   function in the series "remove generic_writepages".
 
 - Baolin Wang has performed some maintenance on the compaction code in
   his series "Some small improvements for compaction".
 
 - Sidhartha Kumar is doing some maintenance work on struct page in his
   series "Get rid of tail page fields".
 
 - David Hildenbrand contributed some cleanup, bugfixing and
   generalization of pte management and of pte debugging in his series "mm:
   support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on all architectures with swap
   PTEs".
 
 - Mel Gorman and Neil Brown have removed the __GFP_ATOMIC allocation
   flag in the series "Discard __GFP_ATOMIC".
 
 - Sergey Senozhatsky has improved zsmalloc's memory utilization with his
   series "zsmalloc: make zspage chain size configurable".
 
 - Joey Gouly has added prctl() support for prohibiting the creation of
   writeable+executable mappings.  The previous BPF-based approach had
   shortcomings.  See "mm: In-kernel support for memory-deny-write-execute
   (MDWE)".
 
 - Waiman Long did some kmemleak cleanup and bugfixing in the series
   "mm/kmemleak: Simplify kmemleak_cond_resched() & fix UAF".
 
 - T.J.  Alumbaugh has contributed some MGLRU cleanup work in his series
   "mm: multi-gen LRU: improve".
 
 - Jiaqi Yan has provided some enhancements to our memory error
   statistics reporting, mainly by presenting the statistics on a per-node
   basis.  See the series "Introduce per NUMA node memory error
   statistics".
 
 - Mel Gorman has a second and hopefully final shot at fixing a CPU-hog
   regression in compaction via his series "Fix excessive CPU usage during
   compaction".
 
 - Christoph Hellwig does some vmalloc maintenance work in the series
   "cleanup vfree and vunmap".
 
 - Christoph Hellwig has removed block_device_operations.rw_page() in ths
   series "remove ->rw_page".
 
 - We get some maple_tree improvements and cleanups in Liam Howlett's
   series "VMA tree type safety and remove __vma_adjust()".
 
 - Suren Baghdasaryan has done some work on the maintainability of our
   vm_flags handling in the series "introduce vm_flags modifier functions".
 
 - Some pagemap cleanup and generalization work in Mike Rapoport's series
   "mm, arch: add generic implementation of pfn_valid() for FLATMEM" and
   "fixups for generic implementation of pfn_valid()"
 
 - Baoquan He has done some work to make /proc/vmallocinfo and
   /proc/kcore better represent the real state of things in his series
   "mm/vmalloc.c: allow vread() to read out vm_map_ram areas".
 
 - Jason Gunthorpe rationalized the GUP system's interface to the rest of
   the kernel in the series "Simplify the external interface for GUP".
 
 - SeongJae Park wishes to migrate people from DAMON's debugfs interface
   over to its sysfs interface.  To support this, we'll temporarily be
   printing warnings when people use the debugfs interface.  See the series
   "mm/damon: deprecate DAMON debugfs interface".
 
 - Andrey Konovalov provided the accurately named "lib/stackdepot: fixes
   and clean-ups" series.
 
 - Huang Ying has provided a dramatic reduction in migration's TLB flush
   IPI rates with the series "migrate_pages(): batch TLB flushing".
 
 - Arnd Bergmann has some objtool fixups in "objtool warning fixes".
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Merge tag 'mm-stable-2023-02-20-13-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - Daniel Verkamp has contributed a memfd series ("mm/memfd: add
   F_SEAL_EXEC") which permits the setting of the memfd execute bit at
   memfd creation time, with the option of sealing the state of the X
   bit.

 - Peter Xu adds a patch series ("mm/hugetlb: Make huge_pte_offset()
   thread-safe for pmd unshare") which addresses a rare race condition
   related to PMD unsharing.

 - Several folioification patch serieses from Matthew Wilcox, Vishal
   Moola, Sidhartha Kumar and Lorenzo Stoakes

 - Johannes Weiner has a series ("mm: push down lock_page_memcg()")
   which does perform some memcg maintenance and cleanup work.

 - SeongJae Park has added DAMOS filtering to DAMON, with the series
   "mm/damon/core: implement damos filter".

   These filters provide users with finer-grained control over DAMOS's
   actions. SeongJae has also done some DAMON cleanup work.

 - Kairui Song adds a series ("Clean up and fixes for swap").

 - Vernon Yang contributed the series "Clean up and refinement for maple
   tree".

 - Yu Zhao has contributed the "mm: multi-gen LRU: memcg LRU" series. It
   adds to MGLRU an LRU of memcgs, to improve the scalability of global
   reclaim.

 - David Hildenbrand has added some userfaultfd cleanup work in the
   series "mm: uffd-wp + change_protection() cleanups".

 - Christoph Hellwig has removed the generic_writepages() library
   function in the series "remove generic_writepages".

 - Baolin Wang has performed some maintenance on the compaction code in
   his series "Some small improvements for compaction".

 - Sidhartha Kumar is doing some maintenance work on struct page in his
   series "Get rid of tail page fields".

 - David Hildenbrand contributed some cleanup, bugfixing and
   generalization of pte management and of pte debugging in his series
   "mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on all architectures with
   swap PTEs".

 - Mel Gorman and Neil Brown have removed the __GFP_ATOMIC allocation
   flag in the series "Discard __GFP_ATOMIC".

 - Sergey Senozhatsky has improved zsmalloc's memory utilization with
   his series "zsmalloc: make zspage chain size configurable".

 - Joey Gouly has added prctl() support for prohibiting the creation of
   writeable+executable mappings.

   The previous BPF-based approach had shortcomings. See "mm: In-kernel
   support for memory-deny-write-execute (MDWE)".

 - Waiman Long did some kmemleak cleanup and bugfixing in the series
   "mm/kmemleak: Simplify kmemleak_cond_resched() & fix UAF".

 - T.J. Alumbaugh has contributed some MGLRU cleanup work in his series
   "mm: multi-gen LRU: improve".

 - Jiaqi Yan has provided some enhancements to our memory error
   statistics reporting, mainly by presenting the statistics on a
   per-node basis. See the series "Introduce per NUMA node memory error
   statistics".

 - Mel Gorman has a second and hopefully final shot at fixing a CPU-hog
   regression in compaction via his series "Fix excessive CPU usage
   during compaction".

 - Christoph Hellwig does some vmalloc maintenance work in the series
   "cleanup vfree and vunmap".

 - Christoph Hellwig has removed block_device_operations.rw_page() in
   ths series "remove ->rw_page".

 - We get some maple_tree improvements and cleanups in Liam Howlett's
   series "VMA tree type safety and remove __vma_adjust()".

 - Suren Baghdasaryan has done some work on the maintainability of our
   vm_flags handling in the series "introduce vm_flags modifier
   functions".

 - Some pagemap cleanup and generalization work in Mike Rapoport's
   series "mm, arch: add generic implementation of pfn_valid() for
   FLATMEM" and "fixups for generic implementation of pfn_valid()"

 - Baoquan He has done some work to make /proc/vmallocinfo and
   /proc/kcore better represent the real state of things in his series
   "mm/vmalloc.c: allow vread() to read out vm_map_ram areas".

 - Jason Gunthorpe rationalized the GUP system's interface to the rest
   of the kernel in the series "Simplify the external interface for
   GUP".

 - SeongJae Park wishes to migrate people from DAMON's debugfs interface
   over to its sysfs interface. To support this, we'll temporarily be
   printing warnings when people use the debugfs interface. See the
   series "mm/damon: deprecate DAMON debugfs interface".

 - Andrey Konovalov provided the accurately named "lib/stackdepot: fixes
   and clean-ups" series.

 - Huang Ying has provided a dramatic reduction in migration's TLB flush
   IPI rates with the series "migrate_pages(): batch TLB flushing".

 - Arnd Bergmann has some objtool fixups in "objtool warning fixes".

* tag 'mm-stable-2023-02-20-13-37' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (505 commits)
  include/linux/migrate.h: remove unneeded externs
  mm/memory_hotplug: cleanup return value handing in do_migrate_range()
  mm/uffd: fix comment in handling pte markers
  mm: change to return bool for isolate_movable_page()
  mm: hugetlb: change to return bool for isolate_hugetlb()
  mm: change to return bool for isolate_lru_page()
  mm: change to return bool for folio_isolate_lru()
  objtool: add UACCESS exceptions for __tsan_volatile_read/write
  kmsan: disable ftrace in kmsan core code
  kasan: mark addr_has_metadata __always_inline
  mm: memcontrol: rename memcg_kmem_enabled()
  sh: initialize max_mapnr
  m68k/nommu: add missing definition of ARCH_PFN_OFFSET
  mm: percpu: fix incorrect size in pcpu_obj_full_size()
  maple_tree: reduce stack usage with gcc-9 and earlier
  mm: page_alloc: call panic() when memoryless node allocation fails
  mm: multi-gen LRU: avoid futile retries
  migrate_pages: move THP/hugetlb migration support check to simplify code
  migrate_pages: batch flushing TLB
  migrate_pages: share more code between _unmap and _move
  ...
2023-02-23 17:09:35 -08:00
Jan Kara
1eeceaec79 udf: Convert udf_expand_file_adinicb() to avoid kmap_atomic()
Remove the last two remaining kmap_atomic() uses in UDF in
udf_expand_file_adinicb(). The first use can be actually conveniently
replaced with udf_adinicb_readpage(), the second with memcpy_to_page().

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:37 +01:00
Jan Kara
5cfc45321a udf: Convert udf_adinicb_writepage() to memcpy_to_page()
Instead of mapping the page manually with kmap() atomic, use helper
memcpy_to_page(). Also delete the pointless SetPageUptodate() call.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:36 +01:00
Jan Kara
7b7f68655f udf: Switch udf_adinicb_readpage() to kmap_local_page()
Instead of using kmap_atomic() use kmap_local_page() in
udf_adinicb_readpage().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:36 +01:00
Jan Kara
174cb748d8 udf: Move udf_adinicb_readpage() to inode.c
udf_adinicb_readpage() is only called from aops functions, move it to
the same file as its callers and also drop the stale comment -
invalidate_lock is protecting us against races with truncate.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:36 +01:00
Jan Kara
759e4d74c0 udf: Mark aops implementation static
Mark functions implementing aops static since they are not needed
outside of inode.c anymore.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:36 +01:00
Jan Kara
37a8a39f7a udf: Switch to single address_space_operations
Now that udf_aops and udf_adiniicb_aops are functionally identical, just
drop udf_adiniicb_aops.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:36 +01:00
Jan Kara
907c6c2ffa udf: Add handling of in-ICB files to udf_bmap()
Add detection of in-ICB files to udf_bmap() and return error in that
case. This will allow us o use single address_space_operations in UDF.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:36 +01:00
Jan Kara
c694e40ba2 udf: Convert all file types to use udf_write_end()
Switching address_space_operations while a file is used is difficult to
do in a race-free way. To be able to use single address_space_operations
in UDF, create udf_write_end() function that is able to handle both
normal and in-ICB files.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:36 +01:00
Jan Kara
60b99a1b9f udf: Convert in-ICB files to use udf_write_begin()
Switching address_space_operations while a file is used is difficult to
do in a race-free way. To be able to use single address_space_operations
in UDF, make in-ICB files use udf_write_begin().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:35 +01:00
Jan Kara
d5abfb1b7b udf: Convert in-ICB files to use udf_direct_IO()
Switching address_space_operations while a file is used is difficult to
do in a race-free way. To be able to use single address_space_operations
in UDF, make in-ICB files use udf_direct_IO().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:35 +01:00
Jan Kara
79d3c6dbad udf: Convert in-ICB files to use udf_writepages()
Switching address_space_operations while a file is used is difficult to
do in a race-free way. To be able to use single address_space_operations
in UDF, make in-ICB files use udf_writepages().

Reported-by: syzbot+c27475eb921c46bbdc62@syzkaller.appspotmail.com
Reported-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:35 +01:00
Jan Kara
b7c31e6f14 udf: Unify .read_folio for normal and in-ICB files
Switching address_space_operations while a file is used is difficult to
do in a race-free way. To be able to use single address_space_operations
in UDF, make udf_read_folio() handle both normal and in-ICB files.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:35 +01:00
Jan Kara
f54aa97fb7 udf: Fix off-by-one error when discarding preallocation
The condition determining whether the preallocation can be used had
an off-by-one error so we didn't discard preallocation when new
allocation was just following it. This can then confuse code in
inode_getblk().

CC: stable@vger.kernel.org
Fixes: 16d0556568 ("udf: Discard preallocation before extending file with a hole")
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:35 +01:00
Jan Kara
36ec52ea03 udf: Fix file corruption when appending just after end of preallocated extent
When we append new block just after the end of preallocated extent, the
code in inode_getblk() wrongly determined we're going to use the
preallocated extent which resulted in adding block into a wrong logical
offset in the file. Sequence like this manifests it:

xfs_io -f -c "pwrite 0x2cacf 0xd122" -c "truncate 0x2dd6f" \
  -c "pwrite 0x27fd9 0x69a9" -c "pwrite 0x32981 0x7244" <file>

The code that determined the use of preallocated extent is actually
stale because udf_do_extend_file() does not create preallocation anymore
so after calling that function we are sure there's no usable
preallocation. Just remove the faulty condition.

CC: stable@vger.kernel.org
Fixes: 16d0556568 ("udf: Discard preallocation before extending file with a hole")
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:35 +01:00
Jan Kara
36580ed087 udf: Do not allocate blocks on page writeback
Now when we allocate blocks on write page fault there should be no block
allocation happening on page writeback. So just ignore the 'create' flag
passed to udf_get_block(). Note that we can spot dirty buffers without
underlying blocks allocated in writeback when we race with expanding
truncate. However in that case these buffers do not contain valid data
so we can safely ignore them and we would just create ourselves problem
when to trim the tail extent.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:35 +01:00
Jan Kara
3c21204818 udf: Allocate blocks on write page fault
Currently if file with holes is mapped, udf allocates blocks for dirtied
pages during page writeback. This however creates problems when to
truncate final extent to proper size and currently we leave the last
extent untruncated which violates UDF standard. So allocate blocks on
write page fault instead. In that case the last extent gets truncated
the file is closed and everything is happy.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:35 +01:00
Jan Kara
b9a861fd52 udf: Protect truncate and file type conversion with invalidate_lock
Protect truncate and file type conversion in udf_file_write_iter() with
invalidate lock. That will allow us to serialize these paths with page
faults so that the page fault can determine the file type in a racefree
way.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:35 +01:00
Jan Kara
2d532616c7 udf: Push i_data_sem locking into udf_extend_file()
Push i_data_sem locking into udf_extend_file(). It somewhat simplifies
the code around it.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:34 +01:00
Jan Kara
6a3b37e0ea udf: Push i_data_sem locking into udf_expand_file_adinicb()
The checks we do in udf_setsize() and udf_file_write_iter() are safe to
do only with i_rwsem locked as it stabilizes both file type and file
size. Hence we don't need to lock i_data_sem before we enter
udf_expand_file_adinicb() which simplifies the locking somewhat.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:34 +01:00
Jan Kara
32f123a3f3 udf: Fold udf_getblk() into udf_bread()
udf_getblk() has a single call site. Fold it there.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:33 +01:00
Jan Kara
541e047b14 udf: Use udf_map_block() in udf_getblk()
Use the new function udf_map_block() in udf_getblk().

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:33 +01:00
Jan Kara
8094252178 udf: Add flag to disable block preallocation
In some cases we don't want to create block preallocation when
allocating blocks. Add a flag to udf_map_rq controlling the behavior.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:33 +01:00
Jan Kara
b3c03fcef2 udf: Pass mapping request into inode_getblk()
Pass struct udf_map_rq into inode_getblk() instead of unfolding it and
the putting the results back.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:33 +01:00
Jan Kara
364a6665d5 udf: Fold udf_block_map() into udf_map_block()
udf_block_map() has now only a single caller. Fold it there.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:33 +01:00
Jan Kara
f3a30be777 udf: Factor out block mapping into udf_map_block()
Create new block mapping function udf_map_block() that takes new
udf_map_rq structure describing mapping request. We will convert other
places to use this function for block mapping.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:33 +01:00
Jan Kara
de80dae03c udf: Move incrementing of goal block directly into inode_getblk()
inode_getblk() sets goal block for the next allocation to the currently
allocated block. This is obviously one less than what the goal block
should be which we fixup in udf_get_block(). Just set the right goal
block directly in inode_getblk().

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:33 +01:00
Jan Kara
101ee137d3 udf: Drop VARCONV support
UDF was supporting a strange mode where the media was containing 7
blocks of unknown data for every 32 blocks of the filesystem. I have yet
to see the media that would need such conversion (maybe it comes from
packet writing times) and the conversions have been inconsistent in the
code. In particular any write will write to a wrong block and corrupt
the media. This is an indication and no user actually needs this so
let's just drop the support instead of trying to fix it.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-26 16:46:32 +01:00
Jan Kara
85a37983ec udf: Detect system inodes linked into directory hierarchy
When UDF filesystem is corrupted, hidden system inodes can be linked
into directory hierarchy which is an avenue for further serious
corruption of the filesystem and kernel confusion as noticed by syzbot
fuzzed images. Refuse to access system inodes linked into directory
hierarchy and vice versa.

CC: stable@vger.kernel.org
Reported-by: syzbot+38695a20b8addcbc1084@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-09 10:39:53 +01:00
Jan Kara
fc8033a34a udf: Preserve link count of system files
System files in UDF filesystem have link count 0. To not confuse VFS we
fudge the link count to be 1 when reading such inodes however we forget
to restore the link count of 0 when writing such inodes. Fix that.

CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-09 10:39:53 +01:00
Jan Kara
b316c443b4 udf: Keep i_lenExtents consistent with the total length of extents
When rounding the last extent to blocksize in inode_getblk() we forgot
to update also i_lenExtents to match the new extent length. This
inconsistency can later confuse some assertion checks.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-09 10:39:53 +01:00
Jan Kara
e57191a8d4 udf: Move setting of i_lenExtents into udf_do_extend_file()
When expanding file for a write into a hole, we were not updating total
length of inode's extents properly. Move the update of i_lenExtents into
udf_do_extend_file() so that both expanding of file by truncate and
expanding of file by writing beyond EOF properly update the length of
extents. As a bonus, we also correctly update the length of extents when
only part of extents can be written.

Signed-off-by: Jan Kara <jack@suse.cz>
2023-01-09 10:39:53 +01:00