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btrfs: allow hole and data seeking to be interruptible

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Doing hole or data seeking on a file with a very large number of extents
can take a long time, and we have reports of it being too slow (such as
at LSFMM from 2017, see the Link below). So make it interruptible.

Link: https://lwn.net/Articles/718805/
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2022-09-01 14:18:21 +01:00 committed by David Sterba
parent bd64f6221a
commit aed0ca180b
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/file.c
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@ -3652,6 +3652,10 @@ static loff_t find_desired_extent(struct btrfs_inode *inode, loff_t offset,
start = em->start + em->len;
free_extent_map(em);
em = NULL;
if (fatal_signal_pending(current)) {
ret = -EINTR;
break;
}
cond_resched();
}
free_extent_map(em);