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(parent: 67b07bd) | patch
btrfs: use kvzalloc for EXTENT_SAME temporary data
authorDavid Sterba <dsterba@suse.com>
Fri, 11 May 2018 15:57:54 +0000 (17:57 +0200)
committerDavid Sterba <dsterba@suse.com>
Mon, 28 May 2018 16:24:09 +0000 (18:24 +0200)
commitbf5091c8d69e95c34dab2224b98a9cb0ccff1aa8
treeac3fff8b933faca399ed8edf10f1f3d3c4b9279dtree | snapshot
parent67b07bd4bec53be0aa5a8496aef7a4ee2c7f97bfcommit | diff
btrfs: use kvzalloc for EXTENT_SAME temporary data

The dedupe range is 16 MiB, with 4 KiB pages and 8 byte pointers, the
arrays can be 32KiB large. To avoid allocation failures due to
fragmented memory, use the allocation with fallback to vmalloc.

The arrays are allocated and freed only inside btrfs_extent_same and
reused for all the ranges.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
fs/btrfs/ioctl.c diff | blob | history
Domain: System / Kernel;