bcachefs: thread_with_stdio: eliminate double buffering

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The output buffer lock has to be a spinlock so that we can write to it
from interrupt context, so we can't use a direct copy_to_user; this
switches thread_with_file_read() to use fault_in_writeable() and
copy_to_user_nofault(), similar to how thread_with_file_write() works.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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This commit is contained in:

Kent Overstreet 2024-02-04 20:19:49 -05:00

parent cb6fc943b6

commit e017047fdb

2 changed files with 18 additions and 41 deletions

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56

fs/bcachefs/thread_with_file.c

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1

fs/bcachefs/thread_with_file.h

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