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Btrfs: read device stats on mount, write modified ones during commit

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The device statistics are written into the device tree with each
transaction commit. Only modified statistics are written.
When a filesystem is mounted, the device statistics for each involved
device are read from the device tree and used to initialize the
counters.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
This commit is contained in:
Stefan Behrens
2012-05-25 16:06:10 +02:00
committed by Josef Bacik
parent c11d2c236c
commit 733f4fbbc1
6 changed files with 232 additions and 0 deletions
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7
fs/btrfs/disk-io.c
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@@ -2354,6 +2354,13 @@ retry_root_backup:
fs_info->generation = generation;
fs_info->last_trans_committed = generation;
ret = btrfs_init_dev_stats(fs_info);
if (ret) {
printk(KERN_ERR "btrfs: failed to init dev_stats: %d\n",
ret);
goto fail_block_groups;
}
ret = btrfs_init_space_info(fs_info);
if (ret) {
printk(KERN_ERR "Failed to initial space info: %d\n", ret);