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buffer: eliminate the need to call free_more_memory() in __getblk_slow()

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Since the previous commit removed any case where grow_buffers()
would return failure due to memory allocations, we can safely
remove the case where we have to call free_more_memory() in
this function.

Since this is also the last user of free_more_memory(), kill
it off completely.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2017-09-27 06:08:57 -06:00
parent 94dc24c0c5
commit bc48f001de
1 changed files with 0 additions and 23 deletions
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23
fs/buffer.c
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@ -252,27 +252,6 @@ __find_get_block_slow(struct block_device *bdev, sector_t block)
return ret;
}
/*
* Kick the writeback threads then try to free up some ZONE_NORMAL memory.
*/
static void free_more_memory(void)
{
struct zoneref *z;
int nid;
wakeup_flusher_threads(1024, WB_REASON_FREE_MORE_MEM);
yield();
for_each_online_node(nid) {
z = first_zones_zonelist(node_zonelist(nid, GFP_NOFS),
gfp_zone(GFP_NOFS), NULL);
if (z->zone)
try_to_free_pages(node_zonelist(nid, GFP_NOFS), 0,
GFP_NOFS, NULL);
}
}
/*
* I/O completion handler for block_read_full_page() - pages
* which come unlocked at the end of I/O.
@ -1086,8 +1065,6 @@ __getblk_slow(struct block_device *bdev, sector_t block,
ret = grow_buffers(bdev, block, size, gfp);
if (ret < 0)
return NULL;
if (ret == 0)
free_more_memory();
}
}