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d62922ba3c
Fix a shutdown WARNING in bch2_dev_free caused by active write I/O references (ca->io_ref[WRITE]) on a device being freed. The problem occurs when: - The filesystem is marked read-only (BCH_FS_rw clear in c->flags). - A subsequent operation (e.g., error handling for device removal) incorrectly tries to grant write references back to a device. - During final shutdown, the read-only flag causes the system to skip stopping write I/O references (bch2_dev_io_ref_stop(ca, WRITE)). - The leftover active write reference triggers the WARN_ON in bch2_dev_free. Prevent this by checking if the filesystem is read-only before attempting to grant write references to a device in the problematic code path. Ensure consistency between the filesystem state flag and the device I/O reference state during shutdown. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Linux kernel
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