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btrfs: comment and minor simplifications in run_delalloc_nocow 

Add a comment explaining why we keep the BUG also use the already read
and cached value of extent ram bytes stored in 'ram_bytes'.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
alistair/sunxi64-5.4-dsi
Nikolay Borisov 2019-08-22 17:25:23 +03:00 committed by David Sterba
parent 922f051824
commit e8e210075a
1 changed files with 3 additions and 4 deletions
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7
fs/btrfs/inode.c
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@ -1503,16 +1503,15 @@ next_slot:
goto out_check;
nocow = true;
} else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
extent_end = found_key.offset +
btrfs_file_extent_ram_bytes(leaf, fi);
extent_end = ALIGN(extent_end,
fs_info->sectorsize);
extent_end = found_key.offset + ram_bytes;
extent_end = ALIGN(extent_end, fs_info->sectorsize);
/* Skip extents outside of our requested range */
if (extent_end <= start) {
path->slots[0]++;
goto next_slot;
}
} else {
/* If this triggers then we have a memory corruption */
BUG();
}
out_check: