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filemap: fix page_cache_next_miss() when no hole found

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page_cache_next_miss() should return value outside of the specified range
when no hole is found.  However currently it will return the last index
*in* the specified range confusing ondemand_readahead() to think there's a
hole in the searched range and upsetting readahead logic.

Link: https://lkml.kernel.org/r/20240625101909.12234-2-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Tested-by: Zhang Peng <zhangpengpeng0808@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jan Kara 2024-06-25 12:18:52 +02:00 committed by Andrew Morton
parent 8051b82a0b
commit 901a269ff3
1 changed files with 3 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
mm/filemap.c
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@ -1752,12 +1752,12 @@ pgoff_t page_cache_next_miss(struct address_space *mapping,
while (max_scan--) {
void *entry = xas_next(&xas);
if (!entry || xa_is_value(entry))
break;
return xas.xa_index;
if (xas.xa_index == 0)
break;
return 0;
}
return xas.xa_index;
return index + max_scan;
}
EXPORT_SYMBOL(page_cache_next_miss);