readahead: introduce FMODE_RANDOM for POSIX_FADV_RANDOM

[karo-tx-linux.git] / mm / readahead.c

diff --git a/mm/readahead.c b/mm/readahead.c
index 033bc135a41f3885cae863ca0c9f5185d6c5d665..337b20e946f6891ed9ae322d22c8e24a1b27f40e 100644 (file)
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -501,6 +501,12 @@ void page_cache_sync_readahead(struct address_space *mapping,
        if (!ra->ra_pages)
                return;
 
+       /* be dumb */
+       if (filp->f_mode & FMODE_RANDOM) {
+               force_page_cache_readahead(mapping, filp, offset, req_size);
+               return;
+       }
+
        /* do read-ahead */
        ondemand_readahead(mapping, ra, filp, false, offset, req_size);
 }