forked from Minki/linux
ec88381936
67244 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
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9c75b68b91 |
Driver core / Documentation fixes for 5.10-rc2
Here is one tiny debugfs change to fix up an API where the last user was successfully fixed up in 5.10-rc1 (so it couldn't be merged earlier), and a much larger Documentation/ABI/ update to the files so they can be automatically parsed by our tools. The Documentation/ABI/ updates are just formatting issues, small ones to bring the files into parsable format, and have been acked by numerous subsystem maintainers and the documentation maintainer. I figured it was good to get this into 5.10-rc2 to help with the merge issues that would arise if these were to stick in linux-next until 5.11-rc1. The debugfs change has been in linux-next for a long time, and the Documentation updates only for the last linux-next release. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- iG0EABECAC0WIQT0tgzFv3jCIUoxPcsxR9QN2y37KQUCX56tfw8cZ3JlZ0Brcm9h aC5jb20ACgkQMUfUDdst+ymeqgCgsmC4/XsduB8cb8QFd18W5BP9M1wAnR7u4B3o HPghJvsslYGYSn1mpQl4 =UJ0M -----END PGP SIGNATURE----- Merge tag 'driver-core-5.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core and documentation fixes from Greg KH: "Here is one tiny debugfs change to fix up an API where the last user was successfully fixed up in 5.10-rc1 (so it couldn't be merged earlier), and a much larger Documentation/ABI/ update to the files so they can be automatically parsed by our tools. The Documentation/ABI/ updates are just formatting issues, small ones to bring the files into parsable format, and have been acked by numerous subsystem maintainers and the documentation maintainer. I figured it was good to get this into 5.10-rc2 to help wih the merge issues that would arise if these were to stick in linux-next until 5.11-rc1. The debugfs change has been in linux-next for a long time, and the Documentation updates only for the last linux-next release" * tag 'driver-core-5.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (40 commits) scripts: get_abi.pl: assume ReST format by default docs: ABI: sysfs-class-led-trigger-pattern: remove hw_pattern duplication docs: ABI: sysfs-class-backlight: unify ABI documentation docs: ABI: sysfs-c2port: remove a duplicated entry docs: ABI: sysfs-class-power: unify duplicated properties docs: ABI: unify /sys/class/leds/<led>/brightness documentation docs: ABI: stable: remove a duplicated documentation docs: ABI: change read/write attributes docs: ABI: cleanup several ABI documents docs: ABI: sysfs-bus-nvdimm: use the right format for ABI docs: ABI: vdso: use the right format for ABI docs: ABI: fix syntax to be parsed using ReST notation docs: ABI: convert testing/configfs-acpi to ReST docs: Kconfig/Makefile: add a check for broken ABI files docs: abi-testing.rst: enable --rst-sources when building docs docs: ABI: don't escape ReST-incompatible chars from obsolete and removed docs: ABI: create a 2-depth index for ABI docs: ABI: make it parse ABI/stable as ReST-compatible files docs: ABI: sysfs-uevent: make it compatible with ReST output docs: ABI: testing: make the files compatible with ReST output ... |
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Linus Torvalds
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53760f9b74 |
flexible-array member conversion patches for 5.10-rc2
Hi Linus, Please, pull the following patches that replace zero-length arrays with flexible-array members. Thanks -- Gustavo -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEkmRahXBSurMIg1YvRwW0y0cG2zEFAl+cjRUACgkQRwW0y0cG 2zGWAhAAjUfTsAmXWhKNaWFSCYR0Q822puTUWOKfiBd+jjGaO04luTtr2gjv2Dkb Vgad8H4N8oZU79xfh5JZ5PUyScaso8wE6ZJTh2PLKXpKmNd213f5x/pIt78CCDTa Y1L/eR41mmveTL3VNS3sf6WaZpT9owxJKGIY8JgdiOmSjxJQpX5zdaC1KYso4eXr lIXIRo9VLEmVLhhHhZi+QmX6+aQ05E1D9K0ENe4/uEnRsV525W78iwZ4fYeLzr+A krEOdgx6sPgzajPYnHoayrrcKNKxD5YY1SWuVSm2tqYYIhlRoK3f5xgLOd10RiHE YMgx8aWzGmGJwoUhgp1bo/l9EZ7O8OWRqM/GOP4x6Wgjdhqw2x5jgskmhsKNGEXu /BlbS+qL5aUrMCxhvNbApuZW6xBiBbva76MH3vU9vFhZbVz1CHLQdGI0tfxggYWS jc2UPgoxL9OQlf3jSc+gK7RMFhBGNWn2Aiy8GQas3BxPYXuYPvwOj+irDOG/qZ9D VZ5swUw4+th+DsF5K53mEFeLv0fONMgL9Ka5bNR6+k6HG0WNLYYVOiet3xYUDo1f eZbMZthfc+QW7R8cwG0WuFk6rC6mLqE+A9nQuLZoJD+VMuJd4pwW9+6EW8nDX08w FS4/o92xUFJfOCgaLRS61FSAuSmFENieN+yoKMK/Uf6PJVdNMb4= =vyu3 -----END PGP SIGNATURE----- Merge tag 'flexible-array-conversions-5.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux Pull more flexible-array member conversions from Gustavo A. R. Silva: "Replace zero-length arrays with flexible-array members" * tag 'flexible-array-conversions-5.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux: printk: ringbuffer: Replace zero-length array with flexible-array member net/smc: Replace zero-length array with flexible-array member net/mlx5: Replace zero-length array with flexible-array member mei: hw: Replace zero-length array with flexible-array member gve: Replace zero-length array with flexible-array member Bluetooth: btintel: Replace zero-length array with flexible-array member scsi: target: tcmu: Replace zero-length array with flexible-array member ima: Replace zero-length array with flexible-array member enetc: Replace zero-length array with flexible-array member fs: Replace zero-length array with flexible-array member Bluetooth: Replace zero-length array with flexible-array member params: Replace zero-length array with flexible-array member tracepoint: Replace zero-length array with flexible-array member platform/chrome: cros_ec_proto: Replace zero-length array with flexible-array member platform/chrome: cros_ec_commands: Replace zero-length array with flexible-array member mailbox: zynqmp-ipi-message: Replace zero-length array with flexible-array member dmaengine: ti-cppi5: Replace zero-length array with flexible-array member |
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Linus Torvalds
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cf9446cc8e |
io_uring-5.10-2020-10-30
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Linus Torvalds
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f5d808567a |
for-5.10-rc1-tag
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Merge tag 'for-5.10-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
- lockdep fixes:
- drop path locks before manipulating sysfs objects or qgroups
- preliminary fixes before tree locks get switched to rwsem
- use annotated seqlock
- build warning fixes (printk format)
- fix relocation vs fallocate race
- tree checker properly validates number of stripes and parity
- readahead vs device replace fixes
- iomap dio fix for unnecessary buffered io fallback
* tag 'for-5.10-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: convert data_seqcount to seqcount_mutex_t
btrfs: don't fallback to buffered read if we don't need to
btrfs: add a helper to read the tree_root commit root for backref lookup
btrfs: drop the path before adding qgroup items when enabling qgroups
btrfs: fix readahead hang and use-after-free after removing a device
btrfs: fix use-after-free on readahead extent after failure to create it
btrfs: tree-checker: validate number of chunk stripes and parity
btrfs: tree-checker: fix incorrect printk format
btrfs: drop the path before adding block group sysfs files
btrfs: fix relocation failure due to race with fallocate
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Greg Kroah-Hartman
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0d519cbf38 |
debugfs: remove return value of debugfs_create_devm_seqfile()
No one checks the return value of debugfs_create_devm_seqfile(), as it's not needed, so make the return value void, so that no one tries to do so in the future. Link: https://lore.kernel.org/r/20201023131037.2500765-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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Gustavo A. R. Silva
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5e01fdff04 |
fs: Replace zero-length array with flexible-array member
There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.9-rc1/process/deprecated.html#zero-length-and-one-element-arrays Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> |
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Linus Torvalds
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598a597636 |
AFS fixes
-----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEqG5UsNXhtOCrfGQP+7dXa6fLC2sFAl+ayiUACgkQ+7dXa6fL C2uZAg//cVeuhu1cUMzNZwE9VotL0a3GXGl+5S1pyJ4lEiKOylJYyxJxsGEG6YiE GxDt9wx78P679Y3VJchDjo7voBXbPqRYFxnbXyq5X/xhNfExRqXhkauao8jWMaku 77UzretUtav7JmgxkGtQ8eMpYkrua7YqcdvMEVjSJ/TqQi68lcU+rMBTO7UnkURb YD43XyFI7D7XXfXpywTc0PYRQi9pEvXryb2OlEvLHLiS0hV9Zj32i6WWmn8GfnhQ Q9107kHYZFU2B+O+IbbImkKtlpC9X0yCAGGi2vDd0RirqKK/gfkMlK0XzwjnvzR4 PoqnMs2yjwcanxTrDD/3gr6MfZ2KRnmrLO6cdRmI3ldSsbkFOSeoQ0DYr4JDdal9 27OixazIcqmZfIssHwOH5pGZvO9bu5+2hlwdZZV7uISORJnqHZZVZ04Bdy+0chZx JTVeyYH2+FDRUM55heVnuI1r6xCbHRyj3On4GF1n8uKrEinkVaEMZCWWcOHlNYnG C3DC6MGxS1DRox/bNcBql9Jk6RkzPI/gzliQA92yAngMtOzyn+uZjqftASVve17R K9/nSQ/43E9LMc+DIEJ+8KSOkSN1zb6dAJ24Z8g7s+VbVb78WwHxojNjb8J9EfW3 lo/eTprYtZvidE8PJTisdzyaJooUifMAMhy8eFwPaXdqwRc7Sjc= =v0Gd -----END PGP SIGNATURE----- Merge tag 'afs-fixes-20201029' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs Pull AFS fixes from David Howells: - Fix copy_file_range() to an afs file now returning EINVAL if the splice_write file op isn't supplied. - Fix a deref-before-check in afs_unuse_cell(). - Fix a use-after-free in afs_xattr_get_acl(). - Fix afs to not try to clear PG_writeback when laundering a page. - Fix afs to take a ref on a page that it sets PG_private on and to drop that ref when clearing PG_private. This is done through recently added helpers. - Fix a page leak if write_begin() fails. - Fix afs_write_begin() to not alter the dirty region info stored in page->private, but rather do this in afs_write_end() instead when we know what we actually changed. - Fix afs_invalidatepage() to alter the dirty region info on a page when partial page invalidation occurs so that we don't inadvertantly include a span of zeros that will get written back if a page gets laundered due to a remote 3rd-party induced invalidation. We mustn't, however, reduce the dirty region if the page has been seen to be mapped (ie. we got called through the page_mkwrite vector) as the page might still be mapped and we might lose data if the file is extended again. - Fix the dirty region info to have a lower resolution if the size of the page is too large for this to be encoded (e.g. powerpc32 with 64K pages). Note that this might not be the ideal way to handle this, since it may allow some leakage of undirtied zero bytes to the server's copy in the case of a 3rd-party conflict. To aid the last two fixes, two additional changes: - Wrap the manipulations of the dirty region info stored in page->private into helper functions. - Alter the encoding of the dirty region so that the region bounds can be stored with one fewer bit, making a bit available for the indication of mappedness. * tag 'afs-fixes-20201029' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: afs: Fix dirty-region encoding on ppc32 with 64K pages afs: Fix afs_invalidatepage to adjust the dirty region afs: Alter dirty range encoding in page->private afs: Wrap page->private manipulations in inline functions afs: Fix where page->private is set during write afs: Fix page leak on afs_write_begin() failure afs: Fix to take ref on page when PG_private is set afs: Fix afs_launder_page to not clear PG_writeback afs: Fix a use after free in afs_xattr_get_acl() afs: Fix tracing deref-before-check afs: Fix copy_file_range() |
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Linus Torvalds
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58130a6cd0 |
Bug fixes for the new ext4 fast commit feature, plus a fix for the
data=journal bug fix. Also use the generic casefolding support which has now landed in fs/libfs.c for 5.10. -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEK2m5VNv+CHkogTfJ8vlZVpUNgaMFAl+aP/IACgkQ8vlZVpUN gaM62gf+JWHXh4d4RS4UcFlQWmT0JlMK8AGEdt90PGeJwO7MmAUC8KRFdMxCSdMQ yqJObRH9w7AFVZYCdroLIC2MyeXj4rASD7DxMgFhu/LYrKOTxCHiTt9gdx/slELM HQoKB77pYs4AZOMPgo+svqf9aHtHPu1Bk3M2C5WW4/BZHjKCxXDD7wONPFLHOq/0 qTcj2JS+1GAivNzwq8/ZFntmbz316FuKF3LNVUvCP+aTbOwD77NtyaBDGr8pnsnz duNyX4CYPo27FM9K/ywGQL9ISCIRxEwPN0GeILc3Cawu6bsr5z+ZBYKbt3DuUv18 hl+E7wrOG/+EMLd6TBfvRN1v5YvwPg== =0J5C -----END PGP SIGNATURE----- Merge tag 'ext4_for_linus_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 fixes from Ted Ts'o: "Bug fixes for the new ext4 fast commit feature, plus a fix for the 'data=journal' bug fix. Also use the generic casefolding support which has now landed in fs/libfs.c for 5.10" * tag 'ext4_for_linus_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: indicate that fast_commit is available via /sys/fs/ext4/feature/... ext4: use generic casefolding support ext4: do not use extent after put_bh ext4: use IS_ERR() for error checking of path ext4: fix mmap write protection for data=journal mode jbd2: fix a kernel-doc markup ext4: use s_mount_flags instead of s_mount_state for fast commit state ext4: make num of fast commit blocks configurable ext4: properly check for dirty state in ext4_inode_datasync_dirty() ext4: fix double locking in ext4_fc_commit_dentry_updates() |
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David Howells
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2d9900f26a |
afs: Fix dirty-region encoding on ppc32 with 64K pages
The dirty region bounds stored in page->private on an afs page are 15 bits
on a 32-bit box and can, at most, represent a range of up to 32K within a
32K page with a resolution of 1 byte. This is a problem for powerpc32 with
64K pages enabled.
Further, transparent huge pages may get up to 2M, which will be a problem
for the afs filesystem on all 32-bit arches in the future.
Fix this by decreasing the resolution. For the moment, a 64K page will
have a resolution determined from PAGE_SIZE. In the future, the page will
need to be passed in to the helper functions so that the page size can be
assessed and the resolution determined dynamically.
Note that this might not be the ideal way to handle this, since it may
allow some leakage of undirtied zero bytes to the server's copy in the case
of a 3rd-party conflict. Fixing that would require a separately allocated
record and is a more complicated fix.
Fixes:
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David Howells
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f86726a69d |
afs: Fix afs_invalidatepage to adjust the dirty region
Fix afs_invalidatepage() to adjust the dirty region recorded in
page->private when truncating a page. If the dirty region is entirely
removed, then the private data is cleared and the page dirty state is
cleared.
Without this, if the page is truncated and then expanded again by truncate,
zeros from the expanded, but no-longer dirty region may get written back to
the server if the page gets laundered due to a conflicting 3rd-party write.
It mustn't, however, shorten the dirty region of the page if that page is
still mmapped and has been marked dirty by afs_page_mkwrite(), so a flag is
stored in page->private to record this.
Fixes:
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David Howells
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65dd2d6072 |
afs: Alter dirty range encoding in page->private
Currently, page->private on an afs page is used to store the range of
dirtied data within the page, where the range includes the lower bound, but
excludes the upper bound (e.g. 0-1 is a range covering a single byte).
This, however, requires a superfluous bit for the last-byte bound so that
on a 4KiB page, it can say 0-4096 to indicate the whole page, the idea
being that having both numbers the same would indicate an empty range.
This is unnecessary as the PG_private bit is clear if it's an empty range
(as is PG_dirty).
Alter the way the dirty range is encoded in page->private such that the
upper bound is reduced by 1 (e.g. 0-0 is then specified the same single
byte range mentioned above).
Applying this to both bounds frees up two bits, one of which can be used in
a future commit.
This allows the afs filesystem to be compiled on ppc32 with 64K pages;
without this, the following warnings are seen:
../fs/afs/internal.h: In function 'afs_page_dirty_to':
../fs/afs/internal.h:881:15: warning: right shift count >= width of type [-Wshift-count-overflow]
881 | return (priv >> __AFS_PAGE_PRIV_SHIFT) & __AFS_PAGE_PRIV_MASK;
| ^~
../fs/afs/internal.h: In function 'afs_page_dirty':
../fs/afs/internal.h:886:28: warning: left shift count >= width of type [-Wshift-count-overflow]
886 | return ((unsigned long)to << __AFS_PAGE_PRIV_SHIFT) | from;
| ^~
Fixes:
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David Howells
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185f0c7073 |
afs: Wrap page->private manipulations in inline functions
The afs filesystem uses page->private to store the dirty range within a
page such that in the event of a conflicting 3rd-party write to the server,
we write back just the bits that got changed locally.
However, there are a couple of problems with this:
(1) I need a bit to note if the page might be mapped so that partial
invalidation doesn't shrink the range.
(2) There aren't necessarily sufficient bits to store the entire range of
data altered (say it's a 32-bit system with 64KiB pages or transparent
huge pages are in use).
So wrap the accesses in inline functions so that future commits can change
how this works.
Also move them out of the tracing header into the in-directory header.
There's not really any need for them to be in the tracing header.
Signed-off-by: David Howells <dhowells@redhat.com>
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David Howells
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f792e3ac82 |
afs: Fix where page->private is set during write
In afs, page->private is set to indicate the dirty region of a page. This
is done in afs_write_begin(), but that can't take account of whether the
copy into the page actually worked.
Fix this by moving the change of page->private into afs_write_end().
Fixes:
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David Howells
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21db2cdc66 |
afs: Fix page leak on afs_write_begin() failure
Fix the leak of the target page in afs_write_begin() when it fails.
Fixes:
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David Howells
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fa04a40b16 |
afs: Fix to take ref on page when PG_private is set
Fix afs to take a ref on a page when it sets PG_private on it and to drop
the ref when removing the flag.
Note that in afs_write_begin(), a lot of the time, PG_private is already
set on a page to which we're going to add some data. In such a case, we
leave the bit set and mustn't increment the page count.
As suggested by Matthew Wilcox, use attach/detach_page_private() where
possible.
Fixes:
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Theodore Ts'o
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6694875ef8 |
ext4: indicate that fast_commit is available via /sys/fs/ext4/feature/...
Signed-off-by: Theodore Ts'o <tytso@mit.edu> |
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Daniel Rosenberg
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f8f4acb6cd |
ext4: use generic casefolding support
This switches ext4 over to the generic support provided in libfs. Since casefolded dentries behave the same in ext4 and f2fs, we decrease the maintenance burden by unifying them, and any optimizations will immediately apply to both. Signed-off-by: Daniel Rosenberg <drosen@google.com> Reviewed-by: Eric Biggers <ebiggers@google.com> Link: https://lore.kernel.org/r/20201028050820.1636571-1-drosen@google.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> |
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yangerkun
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d7dce9e085 |
ext4: do not use extent after put_bh
ext4_ext_search_right() will read more extent blocks and call put_bh after we get the information we need. However, ret_ex will break this and may cause use-after-free once pagecache has been freed. Fix it by copying the extent structure if needed. Signed-off-by: yangerkun <yangerkun@huawei.com> Link: https://lore.kernel.org/r/20201028055617.2569255-1-yangerkun@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org |
||
Harshad Shirwadkar
|
8c9be1e58a |
ext4: use IS_ERR() for error checking of path
With this fix, fast commit recovery code uses IS_ERR() for path
returned by ext4_find_extent.
Fixes:
|
||
Jan Kara
|
b5b18160a3 |
ext4: fix mmap write protection for data=journal mode
Commit |
||
|
Harshad Shirwadkar
|
ababea77bc |
ext4: use s_mount_flags instead of s_mount_state for fast commit state
Ext4's fast commit related transient states should use
sb->s_mount_flags instead of persistent sb->s_mount_state.
Fixes:
|
||
|
Harshad Shirwadkar
|
e029c5f279 |
ext4: make num of fast commit blocks configurable
This patch reserves a field in the jbd2 superblock for number of fast
commit blocks. When this value is non-zero, Ext4 uses this field to
set the number of fast commit blocks.
Fixes:
|
||
Andrea Righi
|
d0520df724 |
ext4: properly check for dirty state in ext4_inode_datasync_dirty()
ext4_inode_datasync_dirty() needs to return 'true' if the inode is dirty, 'false' otherwise, but the logic seems to be incorrectly changed by commit |
||
|
Harshad Shirwadkar
|
5112e9a540 |
ext4: fix double locking in ext4_fc_commit_dentry_updates()
Fixed double locking of sbi->s_fc_lock in the above function as reported by kernel-test-robot. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201023161339.1449437-1-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> |
||
|
David Howells
|
d383e346f9 |
afs: Fix afs_launder_page to not clear PG_writeback
Fix afs_launder_page() to not clear PG_writeback on the page it is
laundering as the flag isn't set in this case.
Fixes:
|
||
Dan Carpenter
|
248c944e21 |
afs: Fix a use after free in afs_xattr_get_acl()
The "op" pointer is freed earlier when we call afs_put_operation().
Fixes:
|
||
|
David Howells
|
acc080d15d |
afs: Fix tracing deref-before-check
The patch |
||
|
David Howells
|
06a17bbe1d |
afs: Fix copy_file_range()
The prevention of splice-write without explicit ops made the
copy_file_write() syscall to an afs file (as done by the generic/112
xfstest) fail with EINVAL.
Fix by using iter_file_splice_write() for afs.
Fixes:
|
||
Davidlohr Bueso
|
d5c8238849 |
btrfs: convert data_seqcount to seqcount_mutex_t
By doing so we can associate the sequence counter to the chunk_mutex for lockdep purposes (compiled-out otherwise), the mutex is otherwise used on the write side. Also avoid explicitly disabling preemption around the write region as it will now be done automatically by the seqcount machinery based on the lock type. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
Johannes Thumshirn
|
0425e7badb |
btrfs: don't fallback to buffered read if we don't need to
Since we switched to the iomap infrastructure in b5ff9f1a96e8f ("btrfs:
switch to iomap for direct IO") we're calling generic_file_buffered_read()
directly and not via generic_file_read_iter() anymore.
If the read could read everything there is no need to bother calling
generic_file_buffered_read(), like it is handled in
generic_file_read_iter().
If we call generic_file_buffered_read() in this case we can hit a
situation where we do an invalid readahead and cause this UBSAN splat
in fstest generic/091:
run fstests generic/091 at 2020-10-21 10:52:32
================================================================================
UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:13
shift exponent 64 is too large for 64-bit type 'long unsigned int'
CPU: 0 PID: 656 Comm: fsx Not tainted 5.9.0-rc7+ #821
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4-rebuilt.opensuse.org 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77
dump_stack+0x57/0x70 lib/dump_stack.c:118
ubsan_epilogue+0x5/0x40 lib/ubsan.c:148
__ubsan_handle_shift_out_of_bounds.cold+0x61/0xe9 lib/ubsan.c:395
__roundup_pow_of_two ./include/linux/log2.h:57
get_init_ra_size mm/readahead.c:318
ondemand_readahead.cold+0x16/0x2c mm/readahead.c:530
generic_file_buffered_read+0x3ac/0x840 mm/filemap.c:2199
call_read_iter ./include/linux/fs.h:1876
new_sync_read+0x102/0x180 fs/read_write.c:415
vfs_read+0x11c/0x1a0 fs/read_write.c:481
ksys_read+0x4f/0xc0 fs/read_write.c:615
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9 arch/x86/entry/entry_64.S:118
RIP: 0033:0x7fe87fee992e
RSP: 002b:00007ffe01605278 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000000000004f000 RCX: 00007fe87fee992e
RDX: 0000000000004000 RSI: 0000000001677000 RDI: 0000000000000003
RBP: 000000000004f000 R08: 0000000000004000 R09: 000000000004f000
R10: 0000000000053000 R11: 0000000000000246 R12: 0000000000004000
R13: 0000000000000000 R14: 000000000007a120 R15: 0000000000000000
================================================================================
BTRFS info (device nullb0): has skinny extents
BTRFS info (device nullb0): ZONED mode enabled, zone size 268435456 B
BTRFS info (device nullb0): enabling ssd optimizations
Fixes:
|
||
Matthew Wilcox (Oracle)
|
9480b4e75b |
cachefiles: Handle readpage error correctly
If ->readpage returns an error, it has already unlocked the page.
Fixes:
|
||
Josef Bacik
|
49d11bead7 |
btrfs: add a helper to read the tree_root commit root for backref lookup
I got the following lockdep splat with tree locks converted to rwsem patches on btrfs/104: ====================================================== WARNING: possible circular locking dependency detected 5.9.0+ #102 Not tainted ------------------------------------------------------ btrfs-cleaner/903 is trying to acquire lock: ffff8e7fab6ffe30 (btrfs-root-00){++++}-{3:3}, at: __btrfs_tree_read_lock+0x32/0x170 but task is already holding lock: ffff8e7fab628a88 (&fs_info->commit_root_sem){++++}-{3:3}, at: btrfs_find_all_roots+0x41/0x80 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&fs_info->commit_root_sem){++++}-{3:3}: down_read+0x40/0x130 caching_thread+0x53/0x5a0 btrfs_work_helper+0xfa/0x520 process_one_work+0x238/0x540 worker_thread+0x55/0x3c0 kthread+0x13a/0x150 ret_from_fork+0x1f/0x30 -> #2 (&caching_ctl->mutex){+.+.}-{3:3}: __mutex_lock+0x7e/0x7b0 btrfs_cache_block_group+0x1e0/0x510 find_free_extent+0xb6e/0x12f0 btrfs_reserve_extent+0xb3/0x1b0 btrfs_alloc_tree_block+0xb1/0x330 alloc_tree_block_no_bg_flush+0x4f/0x60 __btrfs_cow_block+0x11d/0x580 btrfs_cow_block+0x10c/0x220 commit_cowonly_roots+0x47/0x2e0 btrfs_commit_transaction+0x595/0xbd0 sync_filesystem+0x74/0x90 generic_shutdown_super+0x22/0x100 kill_anon_super+0x14/0x30 btrfs_kill_super+0x12/0x20 deactivate_locked_super+0x36/0xa0 cleanup_mnt+0x12d/0x190 task_work_run+0x5c/0xa0 exit_to_user_mode_prepare+0x1df/0x200 syscall_exit_to_user_mode+0x54/0x280 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #1 (&space_info->groups_sem){++++}-{3:3}: down_read+0x40/0x130 find_free_extent+0x2ed/0x12f0 btrfs_reserve_extent+0xb3/0x1b0 btrfs_alloc_tree_block+0xb1/0x330 alloc_tree_block_no_bg_flush+0x4f/0x60 __btrfs_cow_block+0x11d/0x580 btrfs_cow_block+0x10c/0x220 commit_cowonly_roots+0x47/0x2e0 btrfs_commit_transaction+0x595/0xbd0 sync_filesystem+0x74/0x90 generic_shutdown_super+0x22/0x100 kill_anon_super+0x14/0x30 btrfs_kill_super+0x12/0x20 deactivate_locked_super+0x36/0xa0 cleanup_mnt+0x12d/0x190 task_work_run+0x5c/0xa0 exit_to_user_mode_prepare+0x1df/0x200 syscall_exit_to_user_mode+0x54/0x280 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #0 (btrfs-root-00){++++}-{3:3}: __lock_acquire+0x1167/0x2150 lock_acquire+0xb9/0x3d0 down_read_nested+0x43/0x130 __btrfs_tree_read_lock+0x32/0x170 __btrfs_read_lock_root_node+0x3a/0x50 btrfs_search_slot+0x614/0x9d0 btrfs_find_root+0x35/0x1b0 btrfs_read_tree_root+0x61/0x120 btrfs_get_root_ref+0x14b/0x600 find_parent_nodes+0x3e6/0x1b30 btrfs_find_all_roots_safe+0xb4/0x130 btrfs_find_all_roots+0x60/0x80 btrfs_qgroup_trace_extent_post+0x27/0x40 btrfs_add_delayed_data_ref+0x3fd/0x460 btrfs_free_extent+0x42/0x100 __btrfs_mod_ref+0x1d7/0x2f0 walk_up_proc+0x11c/0x400 walk_up_tree+0xf0/0x180 btrfs_drop_snapshot+0x1c7/0x780 btrfs_clean_one_deleted_snapshot+0xfb/0x110 cleaner_kthread+0xd4/0x140 kthread+0x13a/0x150 ret_from_fork+0x1f/0x30 other info that might help us debug this: Chain exists of: btrfs-root-00 --> &caching_ctl->mutex --> &fs_info->commit_root_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&fs_info->commit_root_sem); lock(&caching_ctl->mutex); lock(&fs_info->commit_root_sem); lock(btrfs-root-00); *** DEADLOCK *** 3 locks held by btrfs-cleaner/903: #0: ffff8e7fab628838 (&fs_info->cleaner_mutex){+.+.}-{3:3}, at: cleaner_kthread+0x6e/0x140 #1: ffff8e7faadac640 (sb_internal){.+.+}-{0:0}, at: start_transaction+0x40b/0x5c0 #2: ffff8e7fab628a88 (&fs_info->commit_root_sem){++++}-{3:3}, at: btrfs_find_all_roots+0x41/0x80 stack backtrace: CPU: 0 PID: 903 Comm: btrfs-cleaner Not tainted 5.9.0+ #102 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-2.fc32 04/01/2014 Call Trace: dump_stack+0x8b/0xb0 check_noncircular+0xcf/0xf0 __lock_acquire+0x1167/0x2150 ? __bfs+0x42/0x210 lock_acquire+0xb9/0x3d0 ? __btrfs_tree_read_lock+0x32/0x170 down_read_nested+0x43/0x130 ? __btrfs_tree_read_lock+0x32/0x170 __btrfs_tree_read_lock+0x32/0x170 __btrfs_read_lock_root_node+0x3a/0x50 btrfs_search_slot+0x614/0x9d0 ? find_held_lock+0x2b/0x80 btrfs_find_root+0x35/0x1b0 ? do_raw_spin_unlock+0x4b/0xa0 btrfs_read_tree_root+0x61/0x120 btrfs_get_root_ref+0x14b/0x600 find_parent_nodes+0x3e6/0x1b30 btrfs_find_all_roots_safe+0xb4/0x130 btrfs_find_all_roots+0x60/0x80 btrfs_qgroup_trace_extent_post+0x27/0x40 btrfs_add_delayed_data_ref+0x3fd/0x460 btrfs_free_extent+0x42/0x100 __btrfs_mod_ref+0x1d7/0x2f0 walk_up_proc+0x11c/0x400 walk_up_tree+0xf0/0x180 btrfs_drop_snapshot+0x1c7/0x780 ? btrfs_clean_one_deleted_snapshot+0x73/0x110 btrfs_clean_one_deleted_snapshot+0xfb/0x110 cleaner_kthread+0xd4/0x140 ? btrfs_alloc_root+0x50/0x50 kthread+0x13a/0x150 ? kthread_create_worker_on_cpu+0x40/0x40 ret_from_fork+0x1f/0x30 BTRFS info (device sdb): disk space caching is enabled BTRFS info (device sdb): has skinny extents This happens because qgroups does a backref lookup when we create a delayed ref. From here it may have to look up a root from an indirect ref, which does a normal lookup on the tree_root, which takes the read lock on the tree_root nodes. To fix this we need to add a variant for looking up roots that searches the commit root of the tree_root. Then when we do the backref search using the commit root we are sure to not take any locks on the tree_root nodes. This gets rid of the lockdep splat when running btrfs/104. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Josef Bacik
|
5223cc60b4 |
btrfs: drop the path before adding qgroup items when enabling qgroups
When enabling qgroups we walk the tree_root and then add a qgroup item for every root that we have. This creates a lock dependency on the tree_root and qgroup_root, which results in the following lockdep splat (with tree locks using rwsem), eg. in tests btrfs/017 or btrfs/022: ====================================================== WARNING: possible circular locking dependency detected 5.9.0-default+ #1299 Not tainted ------------------------------------------------------ btrfs/24552 is trying to acquire lock: ffff9142dfc5f630 (btrfs-quota-00){++++}-{3:3}, at: __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] but task is already holding lock: ffff9142dfc5d0b0 (btrfs-root-00){++++}-{3:3}, at: __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (btrfs-root-00){++++}-{3:3}: __lock_acquire+0x3fb/0x730 lock_acquire.part.0+0x6a/0x130 down_read_nested+0x46/0x130 __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] __btrfs_read_lock_root_node+0x3a/0x50 [btrfs] btrfs_search_slot_get_root+0x11d/0x290 [btrfs] btrfs_search_slot+0xc3/0x9f0 [btrfs] btrfs_insert_item+0x6e/0x140 [btrfs] btrfs_create_tree+0x1cb/0x240 [btrfs] btrfs_quota_enable+0xcd/0x790 [btrfs] btrfs_ioctl_quota_ctl+0xc9/0xe0 [btrfs] __x64_sys_ioctl+0x83/0xa0 do_syscall_64+0x2d/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #0 (btrfs-quota-00){++++}-{3:3}: check_prev_add+0x91/0xc30 validate_chain+0x491/0x750 __lock_acquire+0x3fb/0x730 lock_acquire.part.0+0x6a/0x130 down_read_nested+0x46/0x130 __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] __btrfs_read_lock_root_node+0x3a/0x50 [btrfs] btrfs_search_slot_get_root+0x11d/0x290 [btrfs] btrfs_search_slot+0xc3/0x9f0 [btrfs] btrfs_insert_empty_items+0x58/0xa0 [btrfs] add_qgroup_item.part.0+0x72/0x210 [btrfs] btrfs_quota_enable+0x3bb/0x790 [btrfs] btrfs_ioctl_quota_ctl+0xc9/0xe0 [btrfs] __x64_sys_ioctl+0x83/0xa0 do_syscall_64+0x2d/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(btrfs-root-00); lock(btrfs-quota-00); lock(btrfs-root-00); lock(btrfs-quota-00); *** DEADLOCK *** 5 locks held by btrfs/24552: #0: ffff9142df431478 (sb_writers#10){.+.+}-{0:0}, at: mnt_want_write_file+0x22/0xa0 #1: ffff9142f9b10cc0 (&fs_info->subvol_sem){++++}-{3:3}, at: btrfs_ioctl_quota_ctl+0x7b/0xe0 [btrfs] #2: ffff9142f9b11a08 (&fs_info->qgroup_ioctl_lock){+.+.}-{3:3}, at: btrfs_quota_enable+0x3b/0x790 [btrfs] #3: ffff9142df431698 (sb_internal#2){.+.+}-{0:0}, at: start_transaction+0x406/0x510 [btrfs] #4: ffff9142dfc5d0b0 (btrfs-root-00){++++}-{3:3}, at: __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] stack backtrace: CPU: 1 PID: 24552 Comm: btrfs Not tainted 5.9.0-default+ #1299 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba527-rebuilt.opensuse.org 04/01/2014 Call Trace: dump_stack+0x77/0x97 check_noncircular+0xf3/0x110 check_prev_add+0x91/0xc30 validate_chain+0x491/0x750 __lock_acquire+0x3fb/0x730 lock_acquire.part.0+0x6a/0x130 ? __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] ? lock_acquire+0xc4/0x140 ? __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] down_read_nested+0x46/0x130 ? __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] ? btrfs_root_node+0xd9/0x200 [btrfs] __btrfs_read_lock_root_node+0x3a/0x50 [btrfs] btrfs_search_slot_get_root+0x11d/0x290 [btrfs] btrfs_search_slot+0xc3/0x9f0 [btrfs] btrfs_insert_empty_items+0x58/0xa0 [btrfs] add_qgroup_item.part.0+0x72/0x210 [btrfs] btrfs_quota_enable+0x3bb/0x790 [btrfs] btrfs_ioctl_quota_ctl+0xc9/0xe0 [btrfs] __x64_sys_ioctl+0x83/0xa0 do_syscall_64+0x2d/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fix this by dropping the path whenever we find a root item, add the qgroup item, and then re-lookup the root item we found and continue processing roots. Reported-by: David Sterba <dsterba@suse.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
Filipe Manana
|
66d204a16c |
btrfs: fix readahead hang and use-after-free after removing a device
Very sporadically I had test case btrfs/069 from fstests hanging (for years, it is not a recent regression), with the following traces in dmesg/syslog: [162301.160628] BTRFS info (device sdc): dev_replace from /dev/sdd (devid 2) to /dev/sdg started [162301.181196] BTRFS info (device sdc): scrub: finished on devid 4 with status: 0 [162301.287162] BTRFS info (device sdc): dev_replace from /dev/sdd (devid 2) to /dev/sdg finished [162513.513792] INFO: task btrfs-transacti:1356167 blocked for more than 120 seconds. [162513.514318] Not tainted 5.9.0-rc6-btrfs-next-69 #1 [162513.514522] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [162513.514747] task:btrfs-transacti state:D stack: 0 pid:1356167 ppid: 2 flags:0x00004000 [162513.514751] Call Trace: [162513.514761] __schedule+0x5ce/0xd00 [162513.514765] ? _raw_spin_unlock_irqrestore+0x3c/0x60 [162513.514771] schedule+0x46/0xf0 [162513.514844] wait_current_trans+0xde/0x140 [btrfs] [162513.514850] ? finish_wait+0x90/0x90 [162513.514864] start_transaction+0x37c/0x5f0 [btrfs] [162513.514879] transaction_kthread+0xa4/0x170 [btrfs] [162513.514891] ? btrfs_cleanup_transaction+0x660/0x660 [btrfs] [162513.514894] kthread+0x153/0x170 [162513.514897] ? kthread_stop+0x2c0/0x2c0 [162513.514902] ret_from_fork+0x22/0x30 [162513.514916] INFO: task fsstress:1356184 blocked for more than 120 seconds. [162513.515192] Not tainted 5.9.0-rc6-btrfs-next-69 #1 [162513.515431] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [162513.515680] task:fsstress state:D stack: 0 pid:1356184 ppid:1356177 flags:0x00004000 [162513.515682] Call Trace: [162513.515688] __schedule+0x5ce/0xd00 [162513.515691] ? _raw_spin_unlock_irqrestore+0x3c/0x60 [162513.515697] schedule+0x46/0xf0 [162513.515712] wait_current_trans+0xde/0x140 [btrfs] [162513.515716] ? finish_wait+0x90/0x90 [162513.515729] start_transaction+0x37c/0x5f0 [btrfs] [162513.515743] btrfs_attach_transaction_barrier+0x1f/0x50 [btrfs] [162513.515753] btrfs_sync_fs+0x61/0x1c0 [btrfs] [162513.515758] ? __ia32_sys_fdatasync+0x20/0x20 [162513.515761] iterate_supers+0x87/0xf0 [162513.515765] ksys_sync+0x60/0xb0 [162513.515768] __do_sys_sync+0xa/0x10 [162513.515771] do_syscall_64+0x33/0x80 [162513.515774] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [162513.515781] RIP: 0033:0x7f5238f50bd7 [162513.515782] Code: Bad RIP value. [162513.515784] RSP: 002b:00007fff67b978e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a2 [162513.515786] RAX: ffffffffffffffda RBX: 000055b1fad2c560 RCX: 00007f5238f50bd7 [162513.515788] RDX: 00000000ffffffff RSI: 000000000daf0e74 RDI: 000000000000003a [162513.515789] RBP: 0000000000000032 R08: 000000000000000a R09: 00007f5239019be0 [162513.515791] R10: fffffffffffff24f R11: 0000000000000206 R12: 000000000000003a [162513.515792] R13: 00007fff67b97950 R14: 00007fff67b97906 R15: 000055b1fad1a340 [162513.515804] INFO: task fsstress:1356185 blocked for more than 120 seconds. [162513.516064] Not tainted 5.9.0-rc6-btrfs-next-69 #1 [162513.516329] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [162513.516617] task:fsstress state:D stack: 0 pid:1356185 ppid:1356177 flags:0x00000000 [162513.516620] Call Trace: [162513.516625] __schedule+0x5ce/0xd00 [162513.516628] ? _raw_spin_unlock_irqrestore+0x3c/0x60 [162513.516634] schedule+0x46/0xf0 [162513.516647] wait_current_trans+0xde/0x140 [btrfs] [162513.516650] ? finish_wait+0x90/0x90 [162513.516662] start_transaction+0x4d7/0x5f0 [btrfs] [162513.516679] btrfs_setxattr_trans+0x3c/0x100 [btrfs] [162513.516686] __vfs_setxattr+0x66/0x80 [162513.516691] __vfs_setxattr_noperm+0x70/0x200 [162513.516697] vfs_setxattr+0x6b/0x120 [162513.516703] setxattr+0x125/0x240 [162513.516709] ? lock_acquire+0xb1/0x480 [162513.516712] ? mnt_want_write+0x20/0x50 [162513.516721] ? rcu_read_lock_any_held+0x8e/0xb0 [162513.516723] ? preempt_count_add+0x49/0xa0 [162513.516725] ? __sb_start_write+0x19b/0x290 [162513.516727] ? preempt_count_add+0x49/0xa0 [162513.516732] path_setxattr+0xba/0xd0 [162513.516739] __x64_sys_setxattr+0x27/0x30 [162513.516741] do_syscall_64+0x33/0x80 [162513.516743] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [162513.516745] RIP: 0033:0x7f5238f56d5a [162513.516746] Code: Bad RIP value. [162513.516748] RSP: 002b:00007fff67b97868 EFLAGS: 00000202 ORIG_RAX: 00000000000000bc [162513.516750] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f5238f56d5a [162513.516751] RDX: 000055b1fbb0d5a0 RSI: 00007fff67b978a0 RDI: 000055b1fbb0d470 [162513.516753] RBP: 000055b1fbb0d5a0 R08: 0000000000000001 R09: 00007fff67b97700 [162513.516754] R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000004 [162513.516756] R13: 0000000000000024 R14: 0000000000000001 R15: 00007fff67b978a0 [162513.516767] INFO: task fsstress:1356196 blocked for more than 120 seconds. [162513.517064] Not tainted 5.9.0-rc6-btrfs-next-69 #1 [162513.517365] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [162513.517763] task:fsstress state:D stack: 0 pid:1356196 ppid:1356177 flags:0x00004000 [162513.517780] Call Trace: [162513.517786] __schedule+0x5ce/0xd00 [162513.517789] ? _raw_spin_unlock_irqrestore+0x3c/0x60 [162513.517796] schedule+0x46/0xf0 [162513.517810] wait_current_trans+0xde/0x140 [btrfs] [162513.517814] ? finish_wait+0x90/0x90 [162513.517829] start_transaction+0x37c/0x5f0 [btrfs] [162513.517845] btrfs_attach_transaction_barrier+0x1f/0x50 [btrfs] [162513.517857] btrfs_sync_fs+0x61/0x1c0 [btrfs] [162513.517862] ? __ia32_sys_fdatasync+0x20/0x20 [162513.517865] iterate_supers+0x87/0xf0 [162513.517869] ksys_sync+0x60/0xb0 [162513.517872] __do_sys_sync+0xa/0x10 [162513.517875] do_syscall_64+0x33/0x80 [162513.517878] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [162513.517881] RIP: 0033:0x7f5238f50bd7 [162513.517883] Code: Bad RIP value. [162513.517885] RSP: 002b:00007fff67b978e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a2 [162513.517887] RAX: ffffffffffffffda RBX: 000055b1fad2c560 RCX: 00007f5238f50bd7 [162513.517889] RDX: 0000000000000000 RSI: 000000007660add2 RDI: 0000000000000053 [162513.517891] RBP: 0000000000000032 R08: 0000000000000067 R09: 00007f5239019be0 [162513.517893] R10: fffffffffffff24f R11: 0000000000000206 R12: 0000000000000053 [162513.517895] R13: 00007fff67b97950 R14: 00007fff67b97906 R15: 000055b1fad1a340 [162513.517908] INFO: task fsstress:1356197 blocked for more than 120 seconds. [162513.518298] Not tainted 5.9.0-rc6-btrfs-next-69 #1 [162513.518672] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [162513.519157] task:fsstress state:D stack: 0 pid:1356197 ppid:1356177 flags:0x00000000 [162513.519160] Call Trace: [162513.519165] __schedule+0x5ce/0xd00 [162513.519168] ? _raw_spin_unlock_irqrestore+0x3c/0x60 [162513.519174] schedule+0x46/0xf0 [162513.519190] wait_current_trans+0xde/0x140 [btrfs] [162513.519193] ? finish_wait+0x90/0x90 [162513.519206] start_transaction+0x4d7/0x5f0 [btrfs] [162513.519222] btrfs_create+0x57/0x200 [btrfs] [162513.519230] lookup_open+0x522/0x650 [162513.519246] path_openat+0x2b8/0xa50 [162513.519270] do_filp_open+0x91/0x100 [162513.519275] ? find_held_lock+0x32/0x90 [162513.519280] ? lock_acquired+0x33b/0x470 [162513.519285] ? do_raw_spin_unlock+0x4b/0xc0 [162513.519287] ? _raw_spin_unlock+0x29/0x40 [162513.519295] do_sys_openat2+0x20d/0x2d0 [162513.519300] do_sys_open+0x44/0x80 [162513.519304] do_syscall_64+0x33/0x80 [162513.519307] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [162513.519309] RIP: 0033:0x7f5238f4a903 [162513.519310] Code: Bad RIP value. [162513.519312] RSP: 002b:00007fff67b97758 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [162513.519314] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f5238f4a903 [162513.519316] RDX: 0000000000000000 RSI: 00000000000001b6 RDI: 000055b1fbb0d470 [162513.519317] RBP: 00007fff67b978c0 R08: 0000000000000001 R09: 0000000000000002 [162513.519319] R10: 00007fff67b974f7 R11: 0000000000000246 R12: 0000000000000013 [162513.519320] R13: 00000000000001b6 R14: 00007fff67b97906 R15: 000055b1fad1c620 [162513.519332] INFO: task btrfs:1356211 blocked for more than 120 seconds. [162513.519727] Not tainted 5.9.0-rc6-btrfs-next-69 #1 [162513.520115] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [162513.520508] task:btrfs state:D stack: 0 pid:1356211 ppid:1356178 flags:0x00004002 [162513.520511] Call Trace: [162513.520516] __schedule+0x5ce/0xd00 [162513.520519] ? _raw_spin_unlock_irqrestore+0x3c/0x60 [162513.520525] schedule+0x46/0xf0 [162513.520544] btrfs_scrub_pause+0x11f/0x180 [btrfs] [162513.520548] ? finish_wait+0x90/0x90 [162513.520562] btrfs_commit_transaction+0x45a/0xc30 [btrfs] [162513.520574] ? start_transaction+0xe0/0x5f0 [btrfs] [162513.520596] btrfs_dev_replace_finishing+0x6d8/0x711 [btrfs] [162513.520619] btrfs_dev_replace_by_ioctl.cold+0x1cc/0x1fd [btrfs] [162513.520639] btrfs_ioctl+0x2a25/0x36f0 [btrfs] [162513.520643] ? do_sigaction+0xf3/0x240 [162513.520645] ? find_held_lock+0x32/0x90 [162513.520648] ? do_sigaction+0xf3/0x240 [162513.520651] ? lock_acquired+0x33b/0x470 [162513.520655] ? _raw_spin_unlock_irq+0x24/0x50 [162513.520657] ? lockdep_hardirqs_on+0x7d/0x100 [162513.520660] ? _raw_spin_unlock_irq+0x35/0x50 [162513.520662] ? do_sigaction+0xf3/0x240 [162513.520671] ? __x64_sys_ioctl+0x83/0xb0 [162513.520672] __x64_sys_ioctl+0x83/0xb0 [162513.520677] do_syscall_64+0x33/0x80 [162513.520679] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [162513.520681] RIP: 0033:0x7fc3cd307d87 [162513.520682] Code: Bad RIP value. [162513.520684] RSP: 002b:00007ffe30a56bb8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 [162513.520686] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fc3cd307d87 [162513.520687] RDX: 00007ffe30a57a30 RSI: 00000000ca289435 RDI: 0000000000000003 [162513.520689] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [162513.520690] R10: 0000000000000008 R11: 0000000000000202 R12: 0000000000000003 [162513.520692] R13: 0000557323a212e0 R14: 00007ffe30a5a520 R15: 0000000000000001 [162513.520703] Showing all locks held in the system: [162513.520712] 1 lock held by khungtaskd/54: [162513.520713] #0: ffffffffb40a91a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x197 [162513.520728] 1 lock held by in:imklog/596: [162513.520729] #0: ffff8f3f0d781400 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x4d/0x60 [162513.520782] 1 lock held by btrfs-transacti/1356167: [162513.520784] #0: ffff8f3d810cc848 (&fs_info->transaction_kthread_mutex){+.+.}-{3:3}, at: transaction_kthread+0x4a/0x170 [btrfs] [162513.520798] 1 lock held by btrfs/1356190: [162513.520800] #0: ffff8f3d57644470 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write_file+0x22/0x60 [162513.520805] 1 lock held by fsstress/1356184: [162513.520806] #0: ffff8f3d576440e8 (&type->s_umount_key#62){++++}-{3:3}, at: iterate_supers+0x6f/0xf0 [162513.520811] 3 locks held by fsstress/1356185: [162513.520812] #0: ffff8f3d57644470 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x20/0x50 [162513.520815] #1: ffff8f3d80a650b8 (&type->i_mutex_dir_key#10){++++}-{3:3}, at: vfs_setxattr+0x50/0x120 [162513.520820] #2: ffff8f3d57644690 (sb_internal#2){.+.+}-{0:0}, at: start_transaction+0x40e/0x5f0 [btrfs] [162513.520833] 1 lock held by fsstress/1356196: [162513.520834] #0: ffff8f3d576440e8 (&type->s_umount_key#62){++++}-{3:3}, at: iterate_supers+0x6f/0xf0 [162513.520838] 3 locks held by fsstress/1356197: [162513.520839] #0: ffff8f3d57644470 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x20/0x50 [162513.520843] #1: ffff8f3d506465e8 (&type->i_mutex_dir_key#10){++++}-{3:3}, at: path_openat+0x2a7/0xa50 [162513.520846] #2: ffff8f3d57644690 (sb_internal#2){.+.+}-{0:0}, at: start_transaction+0x40e/0x5f0 [btrfs] [162513.520858] 2 locks held by btrfs/1356211: [162513.520859] #0: ffff8f3d810cde30 (&fs_info->dev_replace.lock_finishing_cancel_unmount){+.+.}-{3:3}, at: btrfs_dev_replace_finishing+0x52/0x711 [btrfs] [162513.520877] #1: ffff8f3d57644690 (sb_internal#2){.+.+}-{0:0}, at: start_transaction+0x40e/0x5f0 [btrfs] This was weird because the stack traces show that a transaction commit, triggered by a device replace operation, is blocking trying to pause any running scrubs but there are no stack traces of blocked tasks doing a scrub. After poking around with drgn, I noticed there was a scrub task that was constantly running and blocking for shorts periods of time: >>> t = find_task(prog, 1356190) >>> prog.stack_trace(t) #0 __schedule+0x5ce/0xcfc #1 schedule+0x46/0xe4 #2 schedule_timeout+0x1df/0x475 #3 btrfs_reada_wait+0xda/0x132 #4 scrub_stripe+0x2a8/0x112f #5 scrub_chunk+0xcd/0x134 #6 scrub_enumerate_chunks+0x29e/0x5ee #7 btrfs_scrub_dev+0x2d5/0x91b #8 btrfs_ioctl+0x7f5/0x36e7 #9 __x64_sys_ioctl+0x83/0xb0 #10 do_syscall_64+0x33/0x77 #11 entry_SYSCALL_64+0x7c/0x156 Which corresponds to: int btrfs_reada_wait(void *handle) { struct reada_control *rc = handle; struct btrfs_fs_info *fs_info = rc->fs_info; while (atomic_read(&rc->elems)) { if (!atomic_read(&fs_info->reada_works_cnt)) reada_start_machine(fs_info); wait_event_timeout(rc->wait, atomic_read(&rc->elems) == 0, (HZ + 9) / 10); } (...) So the counter "rc->elems" was set to 1 and never decreased to 0, causing the scrub task to loop forever in that function. Then I used the following script for drgn to check the readahead requests: $ cat dump_reada.py import sys import drgn from drgn import NULL, Object, cast, container_of, execscript, \ reinterpret, sizeof from drgn.helpers.linux import * mnt_path = b"/home/fdmanana/btrfs-tests/scratch_1" mnt = None for mnt in for_each_mount(prog, dst = mnt_path): pass if mnt is None: sys.stderr.write(f'Error: mount point {mnt_path} not found\n') sys.exit(1) fs_info = cast('struct btrfs_fs_info *', mnt.mnt.mnt_sb.s_fs_info) def dump_re(re): nzones = re.nzones.value_() print(f're at {hex(re.value_())}') print(f'\t logical {re.logical.value_()}') print(f'\t refcnt {re.refcnt.value_()}') print(f'\t nzones {nzones}') for i in range(nzones): dev = re.zones[i].device name = dev.name.str.string_() print(f'\t\t dev id {dev.devid.value_()} name {name}') print() for _, e in radix_tree_for_each(fs_info.reada_tree): re = cast('struct reada_extent *', e) dump_re(re) $ drgn dump_reada.py re at 0xffff8f3da9d25ad8 logical 38928384 refcnt 1 nzones 1 dev id 0 name b'/dev/sdd' $ So there was one readahead extent with a single zone corresponding to the source device of that last device replace operation logged in dmesg/syslog. Also the ID of that zone's device was 0 which is a special value set in the source device of a device replace operation when the operation finishes (constant BTRFS_DEV_REPLACE_DEVID set at btrfs_dev_replace_finishing()), confirming again that device /dev/sdd was the source of a device replace operation. Normally there should be as many zones in the readahead extent as there are devices, and I wasn't expecting the extent to be in a block group with a 'single' profile, so I went and confirmed with the following drgn script that there weren't any single profile block groups: $ cat dump_block_groups.py import sys import drgn from drgn import NULL, Object, cast, container_of, execscript, \ reinterpret, sizeof from drgn.helpers.linux import * mnt_path = b"/home/fdmanana/btrfs-tests/scratch_1" mnt = None for mnt in for_each_mount(prog, dst = mnt_path): pass if mnt is None: sys.stderr.write(f'Error: mount point {mnt_path} not found\n') sys.exit(1) fs_info = cast('struct btrfs_fs_info *', mnt.mnt.mnt_sb.s_fs_info) BTRFS_BLOCK_GROUP_DATA = (1 << 0) BTRFS_BLOCK_GROUP_SYSTEM = (1 << 1) BTRFS_BLOCK_GROUP_METADATA = (1 << 2) BTRFS_BLOCK_GROUP_RAID0 = (1 << 3) BTRFS_BLOCK_GROUP_RAID1 = (1 << 4) BTRFS_BLOCK_GROUP_DUP = (1 << 5) BTRFS_BLOCK_GROUP_RAID10 = (1 << 6) BTRFS_BLOCK_GROUP_RAID5 = (1 << 7) BTRFS_BLOCK_GROUP_RAID6 = (1 << 8) BTRFS_BLOCK_GROUP_RAID1C3 = (1 << 9) BTRFS_BLOCK_GROUP_RAID1C4 = (1 << 10) def bg_flags_string(bg): flags = bg.flags.value_() ret = '' if flags & BTRFS_BLOCK_GROUP_DATA: ret = 'data' if flags & BTRFS_BLOCK_GROUP_METADATA: if len(ret) > 0: ret += '|' ret += 'meta' if flags & BTRFS_BLOCK_GROUP_SYSTEM: if len(ret) > 0: ret += '|' ret += 'system' if flags & BTRFS_BLOCK_GROUP_RAID0: ret += ' raid0' elif flags & BTRFS_BLOCK_GROUP_RAID1: ret += ' raid1' elif flags & BTRFS_BLOCK_GROUP_DUP: ret += ' dup' elif flags & BTRFS_BLOCK_GROUP_RAID10: ret += ' raid10' elif flags & BTRFS_BLOCK_GROUP_RAID5: ret += ' raid5' elif flags & BTRFS_BLOCK_GROUP_RAID6: ret += ' raid6' elif flags & BTRFS_BLOCK_GROUP_RAID1C3: ret += ' raid1c3' elif flags & BTRFS_BLOCK_GROUP_RAID1C4: ret += ' raid1c4' else: ret += ' single' return ret def dump_bg(bg): print() print(f'block group at {hex(bg.value_())}') print(f'\t start {bg.start.value_()} length {bg.length.value_()}') print(f'\t flags {bg.flags.value_()} - {bg_flags_string(bg)}') bg_root = fs_info.block_group_cache_tree.address_of_() for bg in rbtree_inorder_for_each_entry('struct btrfs_block_group', bg_root, 'cache_node'): dump_bg(bg) $ drgn dump_block_groups.py block group at 0xffff8f3d673b0400 start 22020096 length 16777216 flags 258 - system raid6 block group at 0xffff8f3d53ddb400 start 38797312 length 536870912 flags 260 - meta raid6 block group at 0xffff8f3d5f4d9c00 start 575668224 length 2147483648 flags 257 - data raid6 block group at 0xffff8f3d08189000 start 2723151872 length 67108864 flags 258 - system raid6 block group at 0xffff8f3db70ff000 start 2790260736 length 1073741824 flags 260 - meta raid6 block group at 0xffff8f3d5f4dd800 start 3864002560 length 67108864 flags 258 - system raid6 block group at 0xffff8f3d67037000 start 3931111424 length 2147483648 flags 257 - data raid6 $ So there were only 2 reasons left for having a readahead extent with a single zone: reada_find_zone(), called when creating a readahead extent, returned NULL either because we failed to find the corresponding block group or because a memory allocation failed. With some additional and custom tracing I figured out that on every further ocurrence of the problem the block group had just been deleted when we were looping to create the zones for the readahead extent (at reada_find_extent()), so we ended up with only one zone in the readahead extent, corresponding to a device that ends up getting replaced. So after figuring that out it became obvious why the hang happens: 1) Task A starts a scrub on any device of the filesystem, except for device /dev/sdd; 2) Task B starts a device replace with /dev/sdd as the source device; 3) Task A calls btrfs_reada_add() from scrub_stripe() and it is currently starting to scrub a stripe from block group X. This call to btrfs_reada_add() is the one for the extent tree. When btrfs_reada_add() calls reada_add_block(), it passes the logical address of the extent tree's root node as its 'logical' argument - a value of 38928384; 4) Task A then enters reada_find_extent(), called from reada_add_block(). It finds there isn't any existing readahead extent for the logical address 38928384, so it proceeds to the path of creating a new one. It calls btrfs_map_block() to find out which stripes exist for the block group X. On the first iteration of the for loop that iterates over the stripes, it finds the stripe for device /dev/sdd, so it creates one zone for that device and adds it to the readahead extent. Before getting into the second iteration of the loop, the cleanup kthread deletes block group X because it was empty. So in the iterations for the remaining stripes it does not add more zones to the readahead extent, because the calls to reada_find_zone() returned NULL because they couldn't find block group X anymore. As a result the new readahead extent has a single zone, corresponding to the device /dev/sdd; 4) Before task A returns to btrfs_reada_add() and queues the readahead job for the readahead work queue, task B finishes the device replace and at btrfs_dev_replace_finishing() swaps the device /dev/sdd with the new device /dev/sdg; 5) Task A returns to reada_add_block(), which increments the counter "->elems" of the reada_control structure allocated at btrfs_reada_add(). Then it returns back to btrfs_reada_add() and calls reada_start_machine(). This queues a job in the readahead work queue to run the function reada_start_machine_worker(), which calls __reada_start_machine(). At __reada_start_machine() we take the device list mutex and for each device found in the current device list, we call reada_start_machine_dev() to start the readahead work. However at this point the device /dev/sdd was already freed and is not in the device list anymore. This means the corresponding readahead for the extent at 38928384 is never started, and therefore the "->elems" counter of the reada_control structure allocated at btrfs_reada_add() never goes down to 0, causing the call to btrfs_reada_wait(), done by the scrub task, to wait forever. Note that the readahead request can be made either after the device replace started or before it started, however in pratice it is very unlikely that a device replace is able to start after a readahead request is made and is able to complete before the readahead request completes - maybe only on a very small and nearly empty filesystem. This hang however is not the only problem we can have with readahead and device removals. When the readahead extent has other zones other than the one corresponding to the device that is being removed (either by a device replace or a device remove operation), we risk having a use-after-free on the device when dropping the last reference of the readahead extent. For example if we create a readahead extent with two zones, one for the device /dev/sdd and one for the device /dev/sde: 1) Before the readahead worker starts, the device /dev/sdd is removed, and the corresponding btrfs_device structure is freed. However the readahead extent still has the zone pointing to the device structure; 2) When the readahead worker starts, it only finds device /dev/sde in the current device list of the filesystem; 3) It starts the readahead work, at reada_start_machine_dev(), using the device /dev/sde; 4) Then when it finishes reading the extent from device /dev/sde, it calls __readahead_hook() which ends up dropping the last reference on the readahead extent through the last call to reada_extent_put(); 5) At reada_extent_put() it iterates over each zone of the readahead extent and attempts to delete an element from the device's 'reada_extents' radix tree, resulting in a use-after-free, as the device pointer of the zone for /dev/sdd is now stale. We can also access the device after dropping the last reference of a zone, through reada_zone_release(), also called by reada_extent_put(). And a device remove suffers the same problem, however since it shrinks the device size down to zero before removing the device, it is very unlikely to still have readahead requests not completed by the time we free the device, the only possibility is if the device has a very little space allocated. While the hang problem is exclusive to scrub, since it is currently the only user of btrfs_reada_add() and btrfs_reada_wait(), the use-after-free problem affects any path that triggers readhead, which includes btree_readahead_hook() and __readahead_hook() (a readahead worker can trigger readahed for the children of a node) for example - any path that ends up calling reada_add_block() can trigger the use-after-free after a device is removed. So fix this by waiting for any readahead requests for a device to complete before removing a device, ensuring that while waiting for existing ones no new ones can be made. This problem has been around for a very long time - the readahead code was added in 2011, device remove exists since 2008 and device replace was introduced in 2013, hard to pick a specific commit for a git Fixes tag. CC: stable@vger.kernel.org # 4.4+ Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
|
Filipe Manana
|
83bc1560e0 |
btrfs: fix use-after-free on readahead extent after failure to create it
If we fail to find suitable zones for a new readahead extent, we end up
leaving a stale pointer in the global readahead extents radix tree
(fs_info->reada_tree), which can trigger the following trace later on:
[13367.696354] BUG: kernel NULL pointer dereference, address: 00000000000000b0
[13367.696802] #PF: supervisor read access in kernel mode
[13367.697249] #PF: error_code(0x0000) - not-present page
[13367.697721] PGD 0 P4D 0
[13367.698171] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC PTI
[13367.698632] CPU: 6 PID: 851214 Comm: btrfs Tainted: G W 5.9.0-rc6-btrfs-next-69 #1
[13367.699100] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[13367.700069] RIP: 0010:__lock_acquire+0x20a/0x3970
[13367.700562] Code: ff 1f 0f b7 c0 48 0f (...)
[13367.701609] RSP: 0018:ffffb14448f57790 EFLAGS: 00010046
[13367.702140] RAX: 0000000000000000 RBX: 29b935140c15e8cf RCX: 0000000000000000
[13367.702698] RDX: 0000000000000002 RSI: ffffffffb3d66bd0 RDI: 0000000000000046
[13367.703240] RBP: ffff8a52ba8ac040 R08: 00000c2866ad9288 R09: 0000000000000001
[13367.703783] R10: 0000000000000001 R11: 00000000b66d9b53 R12: ffff8a52ba8ac9b0
[13367.704330] R13: 0000000000000000 R14: ffff8a532b6333e8 R15: 0000000000000000
[13367.704880] FS: 00007fe1df6b5700(0000) GS:ffff8a5376600000(0000) knlGS:0000000000000000
[13367.705438] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[13367.705995] CR2: 00000000000000b0 CR3: 000000022cca8004 CR4: 00000000003706e0
[13367.706565] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[13367.707127] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[13367.707686] Call Trace:
[13367.708246] ? ___slab_alloc+0x395/0x740
[13367.708820] ? reada_add_block+0xae/0xee0 [btrfs]
[13367.709383] lock_acquire+0xb1/0x480
[13367.709955] ? reada_add_block+0xe0/0xee0 [btrfs]
[13367.710537] ? reada_add_block+0xae/0xee0 [btrfs]
[13367.711097] ? rcu_read_lock_sched_held+0x5d/0x90
[13367.711659] ? kmem_cache_alloc_trace+0x8d2/0x990
[13367.712221] ? lock_acquired+0x33b/0x470
[13367.712784] _raw_spin_lock+0x34/0x80
[13367.713356] ? reada_add_block+0xe0/0xee0 [btrfs]
[13367.713966] reada_add_block+0xe0/0xee0 [btrfs]
[13367.714529] ? btrfs_root_node+0x15/0x1f0 [btrfs]
[13367.715077] btrfs_reada_add+0x117/0x170 [btrfs]
[13367.715620] scrub_stripe+0x21e/0x10d0 [btrfs]
[13367.716141] ? kvm_sched_clock_read+0x5/0x10
[13367.716657] ? __lock_acquire+0x41e/0x3970
[13367.717184] ? scrub_chunk+0x60/0x140 [btrfs]
[13367.717697] ? find_held_lock+0x32/0x90
[13367.718254] ? scrub_chunk+0x60/0x140 [btrfs]
[13367.718773] ? lock_acquired+0x33b/0x470
[13367.719278] ? scrub_chunk+0xcd/0x140 [btrfs]
[13367.719786] scrub_chunk+0xcd/0x140 [btrfs]
[13367.720291] scrub_enumerate_chunks+0x270/0x5c0 [btrfs]
[13367.720787] ? finish_wait+0x90/0x90
[13367.721281] btrfs_scrub_dev+0x1ee/0x620 [btrfs]
[13367.721762] ? rcu_read_lock_any_held+0x8e/0xb0
[13367.722235] ? preempt_count_add+0x49/0xa0
[13367.722710] ? __sb_start_write+0x19b/0x290
[13367.723192] btrfs_ioctl+0x7f5/0x36f0 [btrfs]
[13367.723660] ? __fget_files+0x101/0x1d0
[13367.724118] ? find_held_lock+0x32/0x90
[13367.724559] ? __fget_files+0x101/0x1d0
[13367.724982] ? __x64_sys_ioctl+0x83/0xb0
[13367.725399] __x64_sys_ioctl+0x83/0xb0
[13367.725802] do_syscall_64+0x33/0x80
[13367.726188] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[13367.726574] RIP: 0033:0x7fe1df7add87
[13367.726948] Code: 00 00 00 48 8b 05 09 91 (...)
[13367.727763] RSP: 002b:00007fe1df6b4d48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[13367.728179] RAX: ffffffffffffffda RBX: 000055ce1fb596a0 RCX: 00007fe1df7add87
[13367.728604] RDX: 000055ce1fb596a0 RSI: 00000000c400941b RDI: 0000000000000003
[13367.729021] RBP: 0000000000000000 R08: 00007fe1df6b5700 R09: 0000000000000000
[13367.729431] R10: 00007fe1df6b5700 R11: 0000000000000246 R12: 00007ffd922b07de
[13367.729842] R13: 00007ffd922b07df R14: 00007fe1df6b4e40 R15: 0000000000802000
[13367.730275] Modules linked in: btrfs blake2b_generic xor (...)
[13367.732638] CR2: 00000000000000b0
[13367.733166] ---[ end trace d298b6805556acd9 ]---
What happens is the following:
1) At reada_find_extent() we don't find any existing readahead extent for
the metadata extent starting at logical address X;
2) So we proceed to create a new one. We then call btrfs_map_block() to get
information about which stripes contain extent X;
3) After that we iterate over the stripes and create only one zone for the
readahead extent - only one because reada_find_zone() returned NULL for
all iterations except for one, either because a memory allocation failed
or it couldn't find the block group of the extent (it may have just been
deleted);
4) We then add the new readahead extent to the readahead extents radix
tree at fs_info->reada_tree;
5) Then we iterate over each zone of the new readahead extent, and find
that the device used for that zone no longer exists, because it was
removed or it was the source device of a device replace operation.
Since this left 'have_zone' set to 0, after finishing the loop we jump
to the 'error' label, call kfree() on the new readahead extent and
return without removing it from the radix tree at fs_info->reada_tree;
6) Any future call to reada_find_extent() for the logical address X will
find the stale pointer in the readahead extents radix tree, increment
its reference counter, which can trigger the use-after-free right
away or return it to the caller reada_add_block() that results in the
use-after-free of the example trace above.
So fix this by making sure we delete the readahead extent from the radix
tree if we fail to setup zones for it (when 'have_zone = 0').
Fixes:
|
||
Daniel Xu
|
85d07fbe09 |
btrfs: tree-checker: validate number of chunk stripes and parity
If there's no parity and num_stripes < ncopies, a crafted image can trigger a division by zero in calc_stripe_length(). The image was generated through fuzzing. CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Qu Wenruo <wqu@suse.com> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209587 Signed-off-by: Daniel Xu <dxu@dxuuu.xyz> Signed-off-by: David Sterba <dsterba@suse.com> |
||
Pujin Shi
|
cad69d1396 |
btrfs: tree-checker: fix incorrect printk format
This patch addresses a compile warning:
fs/btrfs/extent-tree.c: In function '__btrfs_free_extent':
fs/btrfs/extent-tree.c:3187:4: warning: format '%lu' expects argument of type 'long unsigned int', but argument 8 has type 'unsigned int' [-Wformat=]
Fixes:
|
||
|
Josef Bacik
|
7837fa8870 |
btrfs: drop the path before adding block group sysfs files
Dave reported a problem with my rwsem conversion patch where we got the following lockdep splat: ====================================================== WARNING: possible circular locking dependency detected 5.9.0-default+ #1297 Not tainted ------------------------------------------------------ kswapd0/76 is trying to acquire lock: ffff9d5d25df2530 (&delayed_node->mutex){+.+.}-{3:3}, at: __btrfs_release_delayed_node.part.0+0x3f/0x320 [btrfs] but task is already holding lock: ffffffffa40cbba0 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x5/0x30 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (fs_reclaim){+.+.}-{0:0}: __lock_acquire+0x582/0xac0 lock_acquire+0xca/0x430 fs_reclaim_acquire.part.0+0x25/0x30 kmem_cache_alloc+0x30/0x9c0 alloc_inode+0x81/0x90 iget_locked+0xcd/0x1a0 kernfs_get_inode+0x1b/0x130 kernfs_get_tree+0x136/0x210 sysfs_get_tree+0x1a/0x50 vfs_get_tree+0x1d/0xb0 path_mount+0x70f/0xa80 do_mount+0x75/0x90 __x64_sys_mount+0x8e/0xd0 do_syscall_64+0x2d/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #3 (kernfs_mutex){+.+.}-{3:3}: __lock_acquire+0x582/0xac0 lock_acquire+0xca/0x430 __mutex_lock+0xa0/0xaf0 kernfs_add_one+0x23/0x150 kernfs_create_dir_ns+0x58/0x80 sysfs_create_dir_ns+0x70/0xd0 kobject_add_internal+0xbb/0x2d0 kobject_add+0x7a/0xd0 btrfs_sysfs_add_block_group_type+0x141/0x1d0 [btrfs] btrfs_read_block_groups+0x1f1/0x8c0 [btrfs] open_ctree+0x981/0x1108 [btrfs] btrfs_mount_root.cold+0xe/0xb0 [btrfs] legacy_get_tree+0x2d/0x60 vfs_get_tree+0x1d/0xb0 fc_mount+0xe/0x40 vfs_kern_mount.part.0+0x71/0x90 btrfs_mount+0x13b/0x3e0 [btrfs] legacy_get_tree+0x2d/0x60 vfs_get_tree+0x1d/0xb0 path_mount+0x70f/0xa80 do_mount+0x75/0x90 __x64_sys_mount+0x8e/0xd0 do_syscall_64+0x2d/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #2 (btrfs-extent-00){++++}-{3:3}: __lock_acquire+0x582/0xac0 lock_acquire+0xca/0x430 down_read_nested+0x45/0x220 __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] __btrfs_read_lock_root_node+0x3a/0x50 [btrfs] btrfs_search_slot+0x6d4/0xfd0 [btrfs] check_committed_ref+0x69/0x200 [btrfs] btrfs_cross_ref_exist+0x65/0xb0 [btrfs] run_delalloc_nocow+0x446/0x9b0 [btrfs] btrfs_run_delalloc_range+0x61/0x6a0 [btrfs] writepage_delalloc+0xae/0x160 [btrfs] __extent_writepage+0x262/0x420 [btrfs] extent_write_cache_pages+0x2b6/0x510 [btrfs] extent_writepages+0x43/0x90 [btrfs] do_writepages+0x40/0xe0 __writeback_single_inode+0x62/0x610 writeback_sb_inodes+0x20f/0x500 wb_writeback+0xef/0x4a0 wb_do_writeback+0x49/0x2e0 wb_workfn+0x81/0x340 process_one_work+0x233/0x5d0 worker_thread+0x50/0x3b0 kthread+0x137/0x150 ret_from_fork+0x1f/0x30 -> #1 (btrfs-fs-00){++++}-{3:3}: __lock_acquire+0x582/0xac0 lock_acquire+0xca/0x430 down_read_nested+0x45/0x220 __btrfs_tree_read_lock+0x35/0x1c0 [btrfs] __btrfs_read_lock_root_node+0x3a/0x50 [btrfs] btrfs_search_slot+0x6d4/0xfd0 [btrfs] btrfs_lookup_inode+0x3a/0xc0 [btrfs] __btrfs_update_delayed_inode+0x93/0x2c0 [btrfs] __btrfs_commit_inode_delayed_items+0x7de/0x850 [btrfs] __btrfs_run_delayed_items+0x8e/0x140 [btrfs] btrfs_commit_transaction+0x367/0xbc0 [btrfs] btrfs_mksubvol+0x2db/0x470 [btrfs] btrfs_mksnapshot+0x7b/0xb0 [btrfs] __btrfs_ioctl_snap_create+0x16f/0x1a0 [btrfs] btrfs_ioctl_snap_create_v2+0xb0/0xf0 [btrfs] btrfs_ioctl+0xd0b/0x2690 [btrfs] __x64_sys_ioctl+0x6f/0xa0 do_syscall_64+0x2d/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #0 (&delayed_node->mutex){+.+.}-{3:3}: check_prev_add+0x91/0xc60 validate_chain+0xa6e/0x2a20 __lock_acquire+0x582/0xac0 lock_acquire+0xca/0x430 __mutex_lock+0xa0/0xaf0 __btrfs_release_delayed_node.part.0+0x3f/0x320 [btrfs] btrfs_evict_inode+0x3cc/0x560 [btrfs] evict+0xd6/0x1c0 dispose_list+0x48/0x70 prune_icache_sb+0x54/0x80 super_cache_scan+0x121/0x1a0 do_shrink_slab+0x16d/0x3b0 shrink_slab+0xb1/0x2e0 shrink_node+0x230/0x6a0 balance_pgdat+0x325/0x750 kswapd+0x206/0x4d0 kthread+0x137/0x150 ret_from_fork+0x1f/0x30 other info that might help us debug this: Chain exists of: &delayed_node->mutex --> kernfs_mutex --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(kernfs_mutex); lock(fs_reclaim); lock(&delayed_node->mutex); *** DEADLOCK *** 3 locks held by kswapd0/76: #0: ffffffffa40cbba0 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x5/0x30 #1: ffffffffa40b8b58 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x54/0x2e0 #2: ffff9d5d322390e8 (&type->s_umount_key#26){++++}-{3:3}, at: trylock_super+0x16/0x50 stack backtrace: CPU: 2 PID: 76 Comm: kswapd0 Not tainted 5.9.0-default+ #1297 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba527-rebuilt.opensuse.org 04/01/2014 Call Trace: dump_stack+0x77/0x97 check_noncircular+0xff/0x110 ? save_trace+0x50/0x470 check_prev_add+0x91/0xc60 validate_chain+0xa6e/0x2a20 ? save_trace+0x50/0x470 __lock_acquire+0x582/0xac0 lock_acquire+0xca/0x430 ? __btrfs_release_delayed_node.part.0+0x3f/0x320 [btrfs] __mutex_lock+0xa0/0xaf0 ? __btrfs_release_delayed_node.part.0+0x3f/0x320 [btrfs] ? __lock_acquire+0x582/0xac0 ? __btrfs_release_delayed_node.part.0+0x3f/0x320 [btrfs] ? btrfs_evict_inode+0x30b/0x560 [btrfs] ? __btrfs_release_delayed_node.part.0+0x3f/0x320 [btrfs] __btrfs_release_delayed_node.part.0+0x3f/0x320 [btrfs] btrfs_evict_inode+0x3cc/0x560 [btrfs] evict+0xd6/0x1c0 dispose_list+0x48/0x70 prune_icache_sb+0x54/0x80 super_cache_scan+0x121/0x1a0 do_shrink_slab+0x16d/0x3b0 shrink_slab+0xb1/0x2e0 shrink_node+0x230/0x6a0 balance_pgdat+0x325/0x750 kswapd+0x206/0x4d0 ? finish_wait+0x90/0x90 ? balance_pgdat+0x750/0x750 kthread+0x137/0x150 ? kthread_mod_delayed_work+0xc0/0xc0 ret_from_fork+0x1f/0x30 This happens because we are still holding the path open when we start adding the sysfs files for the block groups, which creates a dependency on fs_reclaim via the tree lock. Fix this by dropping the path before we start doing anything with sysfs. Reported-by: David Sterba <dsterba@suse.com> CC: stable@vger.kernel.org # 5.8+ Reviewed-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
||
Joe Perches
|
33def8498f |
treewide: Convert macro and uses of __section(foo) to __section("foo")
Use a more generic form for __section that requires quotes to avoid
complications with clang and gcc differences.
Remove the quote operator # from compiler_attributes.h __section macro.
Convert all unquoted __section(foo) uses to quoted __section("foo").
Also convert __attribute__((section("foo"))) uses to __section("foo")
even if the __attribute__ has multiple list entry forms.
Conversion done using the script at:
https://lore.kernel.org/lkml/75393e5ddc272dc7403de74d645e6c6e0f4e70eb.camel@perches.com/2-convert_section.pl
Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@gooogle.com>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
||
Jens Axboe
|
c8b5e2600a |
io_uring: use type appropriate io_kiocb handler for double poll
io_poll_double_wake() is called for both request types - both pure poll requests, and internal polls. This means that we should be using the right handler based on the request type. Use the one that the original caller already assigned for the waitqueue handling, that will always match the correct type. Cc: stable@vger.kernel.org # v5.8+ Reported-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
||
|
Linus Torvalds
|
c10037f832 |
add support for stat of various special file types (WSL reparse points for char, block, fifo)
-----BEGIN PGP SIGNATURE----- iQGzBAABCgAdFiEE6fsu8pdIjtWE/DpLiiy9cAdyT1EFAl+UkSkACgkQiiy9cAdy T1F3bgwApxA6MpakG30bXb+ed0PZPCE5g19qMjj9i+rGyGXn44jzSJAZ9FQzSs6E V95JjLiEKQ+7aaeqiy5Fy96PCHONvbG8RY6rXLgOD2F+wGrVeArXdY/QjotVZLZe Yyx0hHsBs8OeAsjmzYnkG65DVx/oKg3FKYOs22Fw+B5X6UzSY13p7iK3juW64oA/ RWJ0sFizJdn2PKTWGKZPoyncJabvjC8SDPq+GCyQ7uq2plh4I6R+DOXEUdfT7PV7 kyymgqt8MG2gSetxpbIgIEe4QqfNGxYsOxiGB0k/d5XsPHRPtbJkZYHWAiZR7W/f B7Iccgte6Rz5Uv9+FknWibOsEwvHgeh0kCJ+Ct3A53FEP/My6CzG6j2Vq4akTsn3 sPu7nur8ITErUE8ybfxNO08OcqV7Sk28RMTFaZZN5fu+Zb90Pc7rGk49KXKqEsvc GbIU4Lp4nI2eknjcp2+/CX0vUJhn1SmkhvTuh46XdwfIC3aN6yrUg7ZWsVQRHlDI HNX4gVjb =4LDZ -----END PGP SIGNATURE----- Merge tag '5.10-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6 Pull more cifs updates from Steve French: "Add support for stat of various special file types (WSL reparse points for char, block, fifo)" * tag '5.10-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6: cifs: update internal module version number smb3: add some missing definitions from MS-FSCC smb3: remove two unused variables smb3: add support for stat of WSL reparse points for special file types |
||
|
Linus Torvalds
|
af0041875c |
io_uring-5.10-2020-10-24
-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAl+UQh8QHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgpl7WEADOTslFOof1RUPMb0Qvj4GO4cjvoFLW7KLt B83PmlW3WJpZrSiqZlrSPwcDELVphw67RL/2hp0jAfT1t00OdCOYQDmh7+kg9lnI fzu4NzfTKbriRWEtodIqZCiDoGXjzJGxNffhxPEt33YxRErI/fvuD/TzxwGGUInW OZ3Aze9Nj2DQ/eXhio48n4letTK6xNsjGDWvzwinthHWeBbID01isLlTei20PKU5 Dk1buueUuEr/vNjJwEeRd8yDXZeLZ/br3gw/3B71MJoi2PUaXvuS8DV4LmXg2SS5 yN0udSNk4AP/UlrVqN9bEqdbSTBSf2JIEW3k3/SEUjcjw6hMnbLeoW2vZx6Xvk6T vvAVHesLpCu8oEdWAkFm6Rb6ptJ1XpRrWWYxi1J1SB2Y8cGyGS1GoZWWPknM5M3I b1dNj18Bb+MmFvuKr7YYrb77tECuywxTHVGj6WwBOIlYrg44XQOumYYH9OmvZFz1 6vWaXjLPOIM8fpAKX5Tx5sAy/FMl17H8I5AD2bZVvD0h0MqzLnvHEYahcAfOfb9y qpkdGnbAWo6IIkCrDcSOV4q6dmWu3as9eSs1j/6Xl4WoJ2MT9C//Gpv7iNMxxozy CznEPcbA8N9QazQmoebtB3gTBVyGUUKVDdVNzleMj9KD6yPlKFZ6+FZdikX59I9M t9QGh3+gow== =xidc -----END PGP SIGNATURE----- Merge tag 'io_uring-5.10-2020-10-24' of git://git.kernel.dk/linux-block Pull io_uring fixes from Jens Axboe: - fsize was missed in previous unification of work flags - Few fixes cleaning up the flags unification creds cases (Pavel) - Fix NUMA affinities for completely unplugged/replugged node for io-wq - Two fallout fixes from the set_fs changes. One local to io_uring, one for the splice entry point that io_uring uses. - Linked timeout fixes (Pavel) - Removal of ->flush() ->files work-around that we don't need anymore with referenced files (Pavel) - Various cleanups (Pavel) * tag 'io_uring-5.10-2020-10-24' of git://git.kernel.dk/linux-block: splice: change exported internal do_splice() helper to take kernel offset io_uring: make loop_rw_iter() use original user supplied pointers io_uring: remove req cancel in ->flush() io-wq: re-set NUMA node affinities if CPUs come online io_uring: don't reuse linked_timeout io_uring: unify fsize with def->work_flags io_uring: fix racy REQ_F_LINK_TIMEOUT clearing io_uring: do poll's hash_node init in common code io_uring: inline io_poll_task_handler() io_uring: remove extra ->file check in poll prep io_uring: make cached_cq_overflow non atomic_t io_uring: inline io_fail_links() io_uring: kill ref get/drop in personality init io_uring: flags-based creds init in queue |
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Linus Torvalds
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0eac1102e9 |
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc vfs updates from Al Viro: "Assorted stuff all over the place (the largest group here is Christoph's stat cleanups)" * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fs: remove KSTAT_QUERY_FLAGS fs: remove vfs_stat_set_lookup_flags fs: move vfs_fstatat out of line fs: implement vfs_stat and vfs_lstat in terms of vfs_fstatat fs: remove vfs_statx_fd fs: omfs: use kmemdup() rather than kmalloc+memcpy [PATCH] reduce boilerplate in fsid handling fs: Remove duplicated flag O_NDELAY occurring twice in VALID_OPEN_FLAGS selftests: mount: add nosymfollow tests Add a "nosymfollow" mount option. |
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Steve French
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aef0388aa9 |
cifs: update internal module version number
To 2.29 Signed-off-by: Steve French <stfrench@microsoft.com> |
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Linus Torvalds
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f11901ed72 |
Fixes for 5.10-rc1:
- Make fallocate check the alignment of its arguments against the
fundamental allocation unit of the volume the file lives on, so that we
don't trigger the fs' alignment checks.
- Cancel unprocessed log intents immediately when log recovery fails, to
avoid a log deadlock.
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Merge tag 'xfs-5.10-merge-7' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs fixes from Darrick Wong:
"Two bug fixes that trickled in during the merge window:
- Make fallocate check the alignment of its arguments against the
fundamental allocation unit of the volume the file lives on, so
that we don't trigger the fs' alignment checks.
- Cancel unprocessed log intents immediately when log recovery fails,
to avoid a log deadlock"
* tag 'xfs-5.10-merge-7' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: cancel intents immediately if process_intents fails
xfs: fix fallocate functions when rtextsize is larger than 1
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Steve French
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7d03ae4dc4 |
smb3: add some missing definitions from MS-FSCC
Add some structures and defines that were recently added to the protocol documentation (see MS-FSCC sections 2.3.29-2.3.34). Signed-off-by: Steve French <stfrench@microsoft.com> |
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Steve French
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6a87266c04 |
smb3: remove two unused variables
Fix two unused variables in commit "add support for stat of WSL reparse points for special file types" Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Steve French <stfrench@microsoft.com> |
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Steve French
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2e4564b31b |
smb3: add support for stat of WSL reparse points for special file types
This is needed so when mounting to Windows we do not misinterpret various special files created by Linux (WSL) as symlinks. An earlier patch addressed readdir. This patch fixes stat (getattr). With this patch: File: /mnt1/char Size: 0 Blocks: 0 IO Block: 16384 character special file Device: 34h/52d Inode: 844424930132069 Links: 1 Device type: 0,0 Access: (0755/crwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2020-10-21 17:46:51.839458900 -0500 Modify: 2020-10-21 17:46:51.839458900 -0500 Change: 2020-10-21 18:30:39.797358800 -0500 Birth: - File: /mnt1/fifo Size: 0 Blocks: 0 IO Block: 16384 fifo Device: 34h/52d Inode: 1125899906842722 Links: 1 Access: (0755/prwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2020-10-21 16:21:37.259249700 -0500 Modify: 2020-10-21 16:21:37.259249700 -0500 Change: 2020-10-21 18:30:39.797358800 -0500 Birth: - File: /mnt1/block Size: 0 Blocks: 0 IO Block: 16384 block special file Device: 34h/52d Inode: 844424930132068 Links: 1 Device type: 0,0 Access: (0755/brwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2020-10-21 17:10:47.913103200 -0500 Modify: 2020-10-21 17:10:47.913103200 -0500 Change: 2020-10-21 18:30:39.796725500 -0500 Birth: - without the patch all show up incorrectly as symlinks with annoying "operation not supported error also returned" File: /mnt1/charstat: cannot read symbolic link '/mnt1/char': Operation not supported Size: 0 Blocks: 0 IO Block: 16384 symbolic link Device: 34h/52d Inode: 844424930132069 Links: 1 Access: (0000/l---------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2020-10-21 17:46:51.839458900 -0500 Modify: 2020-10-21 17:46:51.839458900 -0500 Change: 2020-10-21 18:30:39.797358800 -0500 Birth: - File: /mnt1/fifostat: cannot read symbolic link '/mnt1/fifo': Operation not supported Size: 0 Blocks: 0 IO Block: 16384 symbolic link Device: 34h/52d Inode: 1125899906842722 Links: 1 Access: (0000/l---------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2020-10-21 16:21:37.259249700 -0500 Modify: 2020-10-21 16:21:37.259249700 -0500 Change: 2020-10-21 18:30:39.797358800 -0500 Birth: - File: /mnt1/blockstat: cannot read symbolic link '/mnt1/block': Operation not supported Size: 0 Blocks: 0 IO Block: 16384 symbolic link Device: 34h/52d Inode: 844424930132068 Links: 1 Access: (0000/l---------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2020-10-21 17:10:47.913103200 -0500 Modify: 2020-10-21 17:10:47.913103200 -0500 Change: 2020-10-21 18:30:39.796725500 -0500 Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> |
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Pavel Begunkov
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0d63c148d6 |
io_uring: simplify __io_queue_sqe()
Restructure __io_queue_sqe() so it follows simple if/else if/else control flow. It's more readable and removes extra goto/labels. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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Pavel Begunkov
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9aaf354352 |
io_uring: simplify nxt propagation in io_queue_sqe
Don't overuse goto's, complex control flow doesn't make compilers happy and makes code harder to read. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> |