bcachefs: Deadlock prevention for ei_pagecache_lock

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In the dio write path, when get_user_pages() invokes the fault handler
we have a recursive locking situation - we have to handle the lock
ordering ourselves or we have a deadlock: this patch addresses that by
checking for locking ordering violations and doing the unlock/relock
dance if necessary.

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

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Kent Overstreet 2020-11-11 12:33:12 -05:00 • committed by Kent Overstreet

parent 6d9378f3dc

commit eb8e6e9ccb

3 changed files with 72 additions and 2 deletions

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68

fs/bcachefs/fs-io.c

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5

fs/bcachefs/fs.c

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1

fs/bcachefs/fs.h

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