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btrfs: heed alloc_start

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currently alloc_start is disregarded if the requested
chunk size is bigger than (device size - alloc_start),
but smaller than the device size.
The only situation where I see this could have made sense
was when a chunk equal the size of the device has been
requested. This was possible as the allocator failed to
take alloc_start into account when calculating the request
chunk size. As this gets fixed by this patch, the workaround
is not necessary anymore.
This commit is contained in:
Arne Jansen 2011-04-12 11:01:20 +02:00
parent bcd53741cc
commit a9c9bf6827
1 changed files with 1 additions and 4 deletions
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5
fs/btrfs/volumes.c
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@ -849,10 +849,7 @@ int find_free_dev_extent(struct btrfs_trans_handle *trans,
/* we don't want to overwrite the superblock on the drive, /* we don't want to overwrite the superblock on the drive,
* so we make sure to start at an offset of at least 1MB * so we make sure to start at an offset of at least 1MB
*/ */
search_start = 1024 * 1024; search_start = max(root->fs_info->alloc_start, 1024ull * 1024);
if (root->fs_info->alloc_start + num_bytes <= search_end)
search_start = max(root->fs_info->alloc_start, search_start);
max_hole_start = search_start; max_hole_start = search_start;
max_hole_size = 0; max_hole_size = 0;