Balance arg info is an important information to be reviewed for the
system audit. So this patch adds them to the kernel log.
Example:
-> btrfs bal start -dprofiles='raid1|single',convert=raid5
-mprofiles='raid1|single',convert=raid5 /btrfs
kernel: BTRFS info (device sdb): balance: start
data<profiles=single|raid1,convert=raid5>|metadata<profiles=single|raid1,convert=raid5>|system<profiles=single|raid1,convert=raid5>
-> btrfs bal start -f -dprofiles=raid5,convert=single
-mprofiles='raid1|single',convert=raid5 --background /btrfs
kernel: BTRFS info (device sdb): balance: start
force|data<profiles=raid5,convert=single>|metadata<profiles=single|raid1,convert=raid5>|system<profiles=single|raid1,convert=raid5>
Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
v2->v3: Change log updated.
Make use of describe_block_group() added in 1/4
Drop using strcat instead use snprintf.
Logs string format updated as shown in the example above.
v1->v2: Change log update.
Move adding the logs for balance complete and end to a new patch
fs/btrfs/volumes.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 103 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 02b1d14f510d..d2e6b81f7874 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3810,6 +3810,107 @@ static inline int validate_convert_profile(struct
btrfs_balance_args *bctl_arg,
(bctl_arg->target & ~allowed)));
}
+static u32 describe_balance_args(struct btrfs_balance_args *bargs, char *buf,
+ u32 sz)
+{
+ char *bp = buf;
+ u64 flags = bargs->flags;
+ char tmp_buf[128];
+
+ if (!flags)
+ return 0;
+
+ if (flags & BTRFS_BALANCE_ARGS_PROFILES) {
+ describe_block_groups(bargs->profiles, tmp_buf,
+ sizeof(tmp_buf));
+ bp += snprintf(bp, buf - bp + sz, "%s%s,", "profiles=",
+ tmp_buf);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_USAGE)
+ bp += snprintf(bp, buf - bp + sz, "usage=%llu,", bargs->usage);
+
+ if (flags & BTRFS_BALANCE_ARGS_USAGE_RANGE)
+ bp += snprintf(bp, buf - bp + sz, "usage_min=%uusage_max=%u,",
+ bargs->usage_min, bargs->usage_max);
+
+ if (flags & BTRFS_BALANCE_ARGS_DEVID)
+ bp += snprintf(bp, buf - bp + sz, "devid=%llu,", bargs->devid);
+
+ if (flags & BTRFS_BALANCE_ARGS_DRANGE)
+ bp += snprintf(bp, buf - bp + sz, "pstart=%llupend=%llu,",
+ bargs->pstart, bargs->pend);
+
+ if (flags & BTRFS_BALANCE_ARGS_VRANGE)
+ bp += snprintf(bp, buf - bp + sz, "vstart=%lluvend %llu,",
+ bargs->vstart, bargs->vend);
+
+ if (flags & BTRFS_BALANCE_ARGS_LIMIT)
+ bp += snprintf(bp, buf - bp + sz, "limit=%llu,", bargs->limit);
+
+ if (flags & BTRFS_BALANCE_ARGS_LIMIT_RANGE)
+ bp += snprintf(bp, buf - bp + sz, "limit_min=%ulimit_max=%u,",
+ bargs->limit_min, bargs->limit_max);
+
+ if (flags & BTRFS_BALANCE_ARGS_STRIPES_RANGE)
+ bp += snprintf(bp, buf - bp + sz,
+ "stripes_min=%ustripes_max=%u,",
+ bargs->stripes_min, bargs->stripes_max);
+
+ if (flags & BTRFS_BALANCE_ARGS_CONVERT) {
+ int index = btrfs_bg_flags_to_raid_index(bargs->target);
+
+ bp += snprintf(bp, buf - bp + sz, "convert=%s,",
+ get_raid_name(index));
+ }
+
+ buf[bp - buf - 1] = '\0'; /* remove last , */
+ return bp - buf - 1;
+}
+
+static void describe_balance_start_or_resume(struct btrfs_fs_info *fs_info)
+{
+ u32 sz = 1024;
+ char tmp_buf[64];
+ char *buf;
+ char *bp;
+ struct btrfs_balance_control *bctl = fs_info->balance_ctl;
+
+ buf = kzalloc(sz, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ bp = buf;
+ if (bctl->flags & BTRFS_BALANCE_ARGS_SOFT)
+ bp += snprintf(bp, buf - bp + sz, "%s|", "soft");
+
+ if (bctl->flags & BTRFS_BALANCE_FORCE)
+ bp += snprintf(bp, buf - bp + sz, "%s|", "force");
+
+ if (bctl->flags & BTRFS_BALANCE_DATA) {
+ describe_balance_args(&bctl->data, tmp_buf, sizeof(tmp_buf));
+ bp += snprintf(bp, buf - bp + sz, "%s<%s>|", "data", tmp_buf);
+ }
+
+ if (bctl->flags & BTRFS_BALANCE_METADATA) {
+ describe_balance_args(&bctl->meta, tmp_buf, sizeof(tmp_buf));
+ bp += snprintf(bp, buf - bp + sz, "%s<%s>|", "metadata",
+ tmp_buf);
+ }
+
+ if (bctl->flags & BTRFS_BALANCE_SYSTEM) {
+ describe_balance_args(&bctl->sys, tmp_buf, sizeof(tmp_buf));
+ bp += snprintf(bp, buf - bp + sz, "%s<%s>|", "system", tmp_buf);
+ }
+
+ buf[bp - buf - 1] = '\0'; /* remove last | */
+ btrfs_info(fs_info, "%s %s",
+ bctl->flags & BTRFS_BALANCE_RESUME ?
+ "balance: resume":"balance: start", buf);
+
+ kfree(buf);
+}
+
/*
* Should be called with balance mutexe held
*/
@@ -3954,6 +4055,7 @@ int btrfs_balance(struct btrfs_fs_info *fs_info,
ASSERT(!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags));
set_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags);
+ describe_balance_start_or_resume(fs_info);
mutex_unlock(&fs_info->balance_mutex);
ret = __btrfs_balance(fs_info);
@@ -3991,10 +4093,8 @@ static int balance_kthread(void *data)
int ret = 0;
mutex_lock(&fs_info->balance_mutex);
- if (fs_info->balance_ctl) {
- btrfs_info(fs_info, "balance: resuming");
+ if (fs_info->balance_ctl)
ret = btrfs_balance(fs_info, fs_info->balance_ctl, NULL);
- }
mutex_unlock(&fs_info->balance_mutex);
return ret;
--
2.7.0
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