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linux/fs/btrfs
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Prasad Singamsetty c34fc6f26a fs: Initial atomic write support 
An atomic write is a write issued with torn-write protection, meaning
that for a power failure or any other hardware failure, all or none of the
data from the write will be stored, but never a mix of old and new data.

Userspace may add flag RWF_ATOMIC to pwritev2() to indicate that the
write is to be issued with torn-write prevention, according to special
alignment and length rules.

For any syscall interface utilizing struct iocb, add IOCB_ATOMIC for
iocb->ki_flags field to indicate the same.

A call to statx will give the relevant atomic write info for a file:
- atomic_write_unit_min
- atomic_write_unit_max
- atomic_write_segments_max

Both min and max values must be a power-of-2.

Applications can avail of atomic write feature by ensuring that the total
length of a write is a power-of-2 in size and also sized between
atomic_write_unit_min and atomic_write_unit_max, inclusive. Applications
must ensure that the write is at a naturally-aligned offset in the file
wrt the total write length. The value in atomic_write_segments_max
indicates the upper limit for IOV_ITER iovcnt.

Add file mode flag FMODE_CAN_ATOMIC_WRITE, so files which do not have the
flag set will have RWF_ATOMIC rejected and not just ignored.

Add a type argument to kiocb_set_rw_flags() to allows reads which have
RWF_ATOMIC set to be rejected.

Helper function generic_atomic_write_valid() can be used by FSes to verify
compliant writes. There we check for iov_iter type is for ubuf, which
implies iovcnt==1 for pwritev2(), which is an initial restriction for
atomic_write_segments_max. Initially the only user will be bdev file
operations write handler. We will rely on the block BIO submission path to
ensure write sizes are compliant for the bdev, so we don't need to check
atomic writes sizes yet.

Signed-off-by: Prasad Singamsetty <prasad.singamsetty@oracle.com>
jpg: merge into single patch and much rewrite
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20240620125359.2684798-4-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2024-06-20 15:19:17 -06:00
..
tests btrfs: use btrfs_is_testing() everywhere 2024-05-07 21:31:07 +02:00
accessors.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
accessors.h btrfs: move balance args conversion helpers to volumes.c 2024-03-04 16:24:52 +01:00
acl.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
acl.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
async-thread.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
async-thread.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
backref.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
backref.h btrfs: uninline some static inline helpers from backref.h 2024-03-04 16:24:53 +01:00
bio.c btrfs: introduce offload_csum_mode to tweak checksum offloading behavior 2024-03-04 16:24:52 +01:00
bio.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
block-group.c btrfs: zoned: don't skip block groups with 100% zone unusable 2024-03-26 16:42:39 +01:00
block-group.h btrfs: mark btrfs_put_caching_control() static 2024-03-05 17:13:23 +01:00
block-rsv.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
block-rsv.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
btrfs_inode.h btrfs: ensure fast fsync waits for ordered extents after a write failure 2024-05-28 16:35:12 +02:00
compression.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
compression.h btrfs: compression: migrate compression/decompression paths to folios 2024-05-07 21:31:02 +02:00
ctree.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
ctree.h btrfs: add forward declarations and headers, part 3 2024-03-04 16:24:49 +01:00
defrag.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
defrag.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
delalloc-space.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
delalloc-space.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
delayed-inode.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
delayed-inode.h btrfs: uninline btrfs_init_delayed_root() 2024-03-04 16:24:53 +01:00
delayed-ref.c btrfs: replace btrfs_delayed_*_ref with btrfs_*_ref 2024-05-07 21:31:05 +02:00
delayed-ref.h btrfs: replace btrfs_delayed_*_ref with btrfs_*_ref 2024-05-07 21:31:05 +02:00
dev-replace.c set_blocksize(): switch to passing struct file * 2024-05-02 17:39:44 -04:00
dev-replace.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
dir-item.c btrfs: abort transaction on generation mismatch when marking eb as dirty 2023-10-12 16:44:07 +02:00
dir-item.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
discard.c btrfs: unexport btrfs_run_discard_work and make it static 2023-06-19 13:59:25 +02:00
discard.h btrfs: unexport btrfs_run_discard_work and make it static 2023-06-19 13:59:25 +02:00
disk-io.c for-6.10-rc2-tag 2024-06-07 15:13:12 -07:00
disk-io.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
export.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
export.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
extent_io.c btrfs: protect folio::private when attaching extent buffer folios 2024-06-06 21:42:22 +02:00
extent_io.h btrfs: add a cached state to extent_clear_unlock_delalloc 2024-05-07 21:31:10 +02:00
extent_map.c btrfs: add tracepoints for extent map shrinker events 2024-05-07 21:31:07 +02:00
extent_map.h btrfs: add extra comments on extent_map members 2024-05-07 21:31:08 +02:00
extent-io-tree.c btrfs: rename err to ret in convert_extent_bit() 2024-05-07 21:31:01 +02:00
extent-io-tree.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
extent-tree.c btrfs: fix end of tree detection when searching for data extent ref 2024-05-15 17:57:39 +02:00
extent-tree.h btrfs: add forward declarations and headers, part 3 2024-03-04 16:24:49 +01:00
file-item.c btrfs: simplify the inline extent map creation 2024-05-07 21:31:08 +02:00
file-item.h btrfs: remove search_commit parameter from btrfs_lookup_csums_list() 2024-05-07 21:31:03 +02:00
file.c for-6.10-rc2-tag 2024-06-05 11:28:25 -07:00
file.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
free-space-cache.c btrfs: rename bitmap_set_bits() -> btrfs_bitmap_set_bits() 2024-04-01 10:49:28 +01:00
free-space-cache.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
free-space-tree.c btrfs: move transaction abort to the error site btrfs_rebuild_free_space_tree() 2024-03-04 16:24:48 +01:00
free-space-tree.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
fs.c btrfs: sysfs: update fs features directory asynchronously 2023-02-13 17:50:35 +01:00
fs.h btrfs: remove duplicate included header from fs.h 2024-05-07 21:31:10 +02:00
inode-item.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
inode-item.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
inode.c for-6.10-tag 2024-05-14 17:25:36 -07:00
ioctl.c fs: Initial atomic write support 2024-06-20 15:19:17 -06:00
ioctl.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
Kconfig btrfs: check-integrity: remove CONFIG_BTRFS_FS_CHECK_INTEGRITY option 2023-10-12 16:44:05 +02:00
locking.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
locking.h btrfs: locking: rename __btrfs_tree_lock() and __btrfs_tree_read_lock() 2024-05-07 21:31:00 +02:00
lru_cache.c btrfs: fix typos found by codespell 2023-12-15 23:00:04 +01:00
lru_cache.h btrfs: open code trivial btrfs_lru_cache_size() 2024-03-04 16:24:53 +01:00
lzo.c btrfs: compression: migrate compression/decompression paths to folios 2024-05-07 21:31:02 +02:00
Makefile btrfs: add support for inserting raid stripe extents 2023-10-12 16:44:09 +02:00
messages.c btrfs: remove colon from messages with state 2024-04-18 01:46:35 +02:00
messages.h btrfs: constify fs_info parameter in __btrfs_panic() 2023-12-15 20:27:02 +01:00
misc.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
ordered-data.c btrfs: ensure fast fsync waits for ordered extents after a write failure 2024-05-28 16:35:12 +02:00
ordered-data.h btrfs: handle errors in btrfs_reloc_clone_csums properly 2024-05-07 21:31:09 +02:00
orphan.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
orphan.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
print-tree.c btrfs: new inline ref storing owning subvol of data extents 2023-10-12 16:44:11 +02:00
print-tree.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
props.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
props.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
qgroup.c btrfs: qgroup: fix qgroup id collision across mounts 2024-05-15 17:57:09 +02:00
qgroup.h btrfs: qgroup: validate btrfs_qgroup_inherit parameter 2024-03-05 17:13:24 +01:00
raid56.c btrfs use bio_list_merge_init 2024-04-01 11:53:37 -06:00
raid56.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
raid-stripe-tree.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
raid-stripe-tree.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
rcu-string.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
ref-verify.c btrfs: rename btrfs_data_ref->ino to ->objectid 2024-05-07 21:31:05 +02:00
ref-verify.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
reflink.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
reflink.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
relocation.c btrfs: handle errors in btrfs_reloc_clone_csums properly 2024-05-07 21:31:09 +02:00
relocation.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
root-tree.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
root-tree.h btrfs: qgroup: fix qgroup prealloc rsv leak in subvolume operations 2024-04-02 19:18:23 +02:00
scrub.c btrfs: scrub: initialize ret in scrub_simple_mirror() to fix compilation warning 2024-05-15 17:57:32 +02:00
scrub.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
send.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
send.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
space-info.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
space-info.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
subpage.c btrfs: subpage: make writer lock utilize bitmap 2024-03-05 17:13:23 +01:00
subpage.h btrfs: subpage: make reader lock utilize bitmap 2024-03-05 17:13:23 +01:00
super.c btrfs: re-introduce 'norecovery' mount option 2024-05-21 15:27:17 +02:00
super.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
sysfs.c btrfs: use btrfs_is_testing() everywhere 2024-05-07 21:31:07 +02:00
sysfs.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
transaction.c btrfs: rename werr and err to ret in __btrfs_wait_marked_extents() 2024-05-07 21:31:08 +02:00
transaction.h btrfs: remove no longer used btrfs_transaction_in_commit() 2024-03-04 16:24:52 +01:00
tree-checker.c btrfs: use btrfs_is_testing() everywhere 2024-05-07 21:31:07 +02:00
tree-checker.h btrfs: make sure that WRITTEN is set on all metadata blocks 2024-05-02 22:11:13 +02:00
tree-log.c btrfs: fix crash on racing fsync and size-extending write into prealloc 2024-06-05 18:06:30 +02:00
tree-log.h btrfs: uninline some static inline helpers from tree-log.h 2024-03-04 16:24:53 +01:00
tree-mod-log.c btrfs: change root->root_key.objectid to btrfs_root_id() 2024-05-07 21:31:06 +02:00
tree-mod-log.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
ulist.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
ulist.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
uuid-tree.c btrfs: unify handling of return values of btrfs_insert_empty_items() 2024-03-04 16:24:48 +01:00
uuid-tree.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
verity.c btrfs: remove unused included headers 2024-03-04 16:24:46 +01:00
verity.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
volumes.c bd_inode series 2024-05-21 09:51:42 -07:00
volumes.h btrfs: count super block write errors in device instead of tracking folio error state 2024-05-07 21:31:11 +02:00
xattr.c btrfs: rename err to ret in btrfs_initxattrs() 2024-05-07 21:31:00 +02:00
xattr.h btrfs: add forward declarations and headers, part 1 2024-03-04 16:24:49 +01:00
zlib.c btrfs: compression: migrate compression/decompression paths to folios 2024-05-07 21:31:02 +02:00
zoned.c for-6.10-tag 2024-05-24 09:40:31 -07:00
zoned.h btrfs: add forward declarations and headers, part 2 2024-03-04 16:24:49 +01:00
zstd.c btrfs: compression: migrate compression/decompression paths to folios 2024-05-07 21:31:02 +02:00