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| author | Donggeun Yoo <donggeunyoo.kernel@gmail.com> | 2026-09-02 00:21:26 +0900 |
|---|---|---|
| committer | Jonathan Cameron <jonathan.cameron@oss.qualcomm.com> | 2026-09-07 02:24:53 +0100 |
| commit | e24328974a88aa8541e94e8bb8dfa2ade1b3c45d (patch) | |
| tree | 43a2533acc955d11f5cb8be1ecba0ab8ba4cbb1e /Documentation/filesystems/ext4/blockmap.rst | |
| download | linux-stable-e24328974a88aa8541e94e8bb8dfa2ade1b3c45d.tar.gz linux-stable-e24328974a88aa8541e94e8bb8dfa2ade1b3c45d.zip | |
iio: proximity: vl53l0x-i2c: claim direct mode for raw readsgrafted
vl53l0x_read_raw() starts a single-shot ranging measurement and reads
back the result. Once the triggered buffer is enabled the sensor runs in
continuous mode and its data-ready interrupt is routed to the trigger,
so a concurrent in_distance_raw read disturbs the streaming setup and
never gets its completion, returning -ETIMEDOUT.
The original submission claimed direct mode here, but it was dropped
during review because the driver had no buffer support at the time [1].
Continuous (buffered) mode was later added without restoring the
claim [2], reintroducing the conflict.
Reject direct reads while buffered capture is active by claiming direct
mode around the measurement, as the vl53l1x sibling already does.
Fixes: 762186c6e7b1 ("iio: proximity: vl53l0x-i2c: Added continuous mode support")
Link: https://lore.kernel.org/linux-iio/20180911160300.GA9212@himanshu-Vostro-3559/ [1]
Link: https://lore.kernel.org/linux-iio/20240909101508.263085-3-abhashkumarjha123@gmail.com/ [2]
Signed-off-by: Donggeun Yoo <donggeunyoo.kernel@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Diffstat (limited to 'Documentation/filesystems/ext4/blockmap.rst')
| -rw-r--r-- | Documentation/filesystems/ext4/blockmap.rst | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/filesystems/ext4/blockmap.rst b/Documentation/filesystems/ext4/blockmap.rst new file mode 100644 index 000000000..cc596541c --- /dev/null +++ b/Documentation/filesystems/ext4/blockmap.rst @@ -0,0 +1,49 @@ +.. SPDX-License-Identifier: GPL-2.0 + ++---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +| i.i_block Offset | Where It Points | ++=====================+==============================================================================================================================================================================================================================+ +| 0 to 11 | Direct map to file blocks 0 to 11. | ++---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +| 12 | Indirect block: (file blocks 12 to (``$block_size`` / 4) + 11, or 12 to 1035 if 4KiB blocks) | +| | | +| | +------------------------------+--------------------------------------------------------------------+ | +| | | Indirect Block Offset | Where It Points | | +| | +==============================+====================================================================+ | +| | | 0 to (``$block_size`` / 4) | Direct map to (``$block_size`` / 4) blocks (1024 if 4KiB blocks) | | +| | +------------------------------+--------------------------------------------------------------------+ | ++---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +| 13 | Double-indirect block: (file blocks ``$block_size``/4 + 12 to (``$block_size`` / 4) ^ 2 + (``$block_size`` / 4) + 11, or 1036 to 1049611 if 4KiB blocks) | +| | | +| | +--------------------------------+---------------------------------------------------------------------------------------------------------+ | +| | | Double Indirect Block Offset | Where It Points | | +| | +================================+=========================================================================================================+ | +| | | 0 to (``$block_size`` / 4) | Map to (``$block_size`` / 4) indirect blocks (1024 if 4KiB blocks) | | +| | | | | | +| | | | +------------------------------+--------------------------------------------------------------------+ | | +| | | | | Indirect Block Offset | Where It Points | | | +| | | | +==============================+====================================================================+ | | +| | | | | 0 to (``$block_size`` / 4) | Direct map to (``$block_size`` / 4) blocks (1024 if 4KiB blocks) | | | +| | | | +------------------------------+--------------------------------------------------------------------+ | | +| | +--------------------------------+---------------------------------------------------------------------------------------------------------+ | ++---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ +| 14 | Triple-indirect block: (file blocks (``$block_size`` / 4) ^ 2 + (``$block_size`` / 4) + 12 to (``$block_size`` / 4) ^ 3 + (``$block_size`` / 4) ^ 2 + (``$block_size`` / 4) + 12, or 1049612 to 1074791436 if 4KiB blocks) | +| | | +| | +--------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+ | +| | | Triple Indirect Block Offset | Where It Points | | +| | +================================+================================================================================================================================================+ | +| | | 0 to (``$block_size`` / 4) | Map to (``$block_size`` / 4) double indirect blocks (1024 if 4KiB blocks) | | +| | | | | | +| | | | +--------------------------------+---------------------------------------------------------------------------------------------------------+ | | +| | | | | Double Indirect Block Offset | Where It Points | | | +| | | | +================================+=========================================================================================================+ | | +| | | | | 0 to (``$block_size`` / 4) | Map to (``$block_size`` / 4) indirect blocks (1024 if 4KiB blocks) | | | +| | | | | | | | | +| | | | | | +------------------------------+--------------------------------------------------------------------+ | | | +| | | | | | | Indirect Block Offset | Where It Points | | | | +| | | | | | +==============================+====================================================================+ | | | +| | | | | | | 0 to (``$block_size`` / 4) | Direct map to (``$block_size`` / 4) blocks (1024 if 4KiB blocks) | | | | +| | | | | | +------------------------------+--------------------------------------------------------------------+ | | | +| | | | +--------------------------------+---------------------------------------------------------------------------------------------------------+ | | +| | +--------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+ | ++---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ |