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btrfs: increase output size for LOGICAL_INO_V2 ioctl 

Build-server workloads have hundreds of references per file after dedup.
Multiply by a few snapshots and we quickly exhaust the limit of 2730
references per extent that can fit into a 64K buffer.

Raise the limit to 16M to be consistent with other btrfs ioctls
(e.g. TREE_SEARCH_V2, FILE_EXTENT_SAME).

To minimize surprising userspace behavior, apply this change only to
the LOGICAL_INO_V2 ioctl.

Signed-off-by: Zygo Blaxell <ce3g8jdj@umail.furryterror.org>
Reviewed-by: Hans van Kranenburg <hans.van.kranenburg@mendix.com>
Tested-by: Hans van Kranenburg <hans.van.kranenburg@mendix.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Zygo Blaxell 2017-09-22 13:58:47 -04:00 committed by David Sterba
parent d24a67b2d9
commit b115e3bc81
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/ioctl.c
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@ -4548,6 +4548,7 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
if (version == 1) {
ignore_offset = false;
size = min_t(u32, loi->size, SZ_64K);
} else {
/* All reserved bits must be 0 for now */
if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
@ -4560,6 +4561,7 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
goto out_loi;
}
ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
size = min_t(u32, loi->size, SZ_16M);
}
path = btrfs_alloc_path();
@ -4568,7 +4570,6 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
goto out;
}
size = min_t(u32, loi->size, SZ_64K);
inodes = init_data_container(size);
if (IS_ERR(inodes)) {
ret = PTR_ERR(inodes);