bcachefs: Fix lock thrashing in __bchfs_fallocate()

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We've observed significant lock thrashing on fstests generic/083 in
fallocate, due to dropping and retaking btree locks when checking the
pagecache for data.

This adds a nonblocking mode to bch2_clamp_data_hole(), where we only
use folio_trylock(), and can thus be used safely while btree locks are
held - thus we only have to drop btree locks as a fallback, on actual
lock contention.

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

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Kent Overstreet 2023-08-03 03:39:49 -04:00

parent f6e6f42bbb

commit 4198bf03be

1 changed files with 56 additions and 25 deletions

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fs/bcachefs/fs-io.c

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