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 -f -mprofiles=raid1,convert=single,soft -dlimit=10..20,usage=50 /btrfs
kernel: BTRFS info (device sdb): balance: start -f -dusage=50,limit=10..20 -msoft,profiles=raid1,convert=single -ssoft,profiles=raid1,convert=single
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
v4.1->v5: Per David review comment the code..
bp += snprintf(bp, buf - bp + size_buf, "soft,");
is not safe if 'buf - bp + size_buf' becomes accidentally
negative, so fix this by using following snprintf.
#define CHECK_UPDATE_BP_1(a) \
do { \
ret = snprintf(bp, size_bp, a); \
if (ret < 0 || ret >= size_bp) \
goto out; \
size_bp -= ret; \
bp += ret; \
} while (0)
And initialize the tmp_buf to null.
v4->v4.1: Rename last missed sz to size_buf.
v3->v4: Change log updated with new example.
Log format is changed to almost match with the cli.
snprintf drop %s for inline string.
Print range as =%u..%u instead of min=%umax=%u.
soft is under the args now.
force is printed as -f.
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 | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 169 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 12b3d0625c6a..8397f72bdac7 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3754,6 +3754,173 @@ static inline int validate_convert_profile(struct btrfs_balance_args *bctl_arg,
(bctl_arg->target & ~allowed)));
}
+static void describe_balance_args(struct btrfs_balance_args *bargs, char *buf,
+ u32 size_buf)
+{
+ int ret;
+ u32 size_bp = size_buf;
+ char *bp = buf;
+ u64 flags = bargs->flags;
+ char tmp_buf[128] = {'\0'};
+
+ if (!flags)
+ return;
+
+#define CHECK_UPDATE_BP_1(a) \
+ do { \
+ ret = snprintf(bp, size_bp, a); \
+ if (ret < 0 || ret >= size_bp) \
+ goto out; \
+ size_bp -= ret; \
+ bp += ret; \
+ } while (0)
+
+#define CHECK_UPDATE_BP_2(a, v1) \
+ do { \
+ ret = snprintf(bp, size_bp, a, v1); \
+ if (ret < 0 || ret >= size_bp) \
+ goto out; \
+ size_bp -= ret; \
+ bp += ret; \
+ } while (0)
+
+#define CHECK_UPDATE_BP_3(a, v1, v2) \
+ do { \
+ ret = snprintf(bp, size_bp, a, v1, v2); \
+ if (ret < 0 || ret >= size_bp) \
+ goto out; \
+ size_bp -= ret; \
+ bp += ret; \
+ } while (0)
+
+ if (flags & BTRFS_BALANCE_ARGS_SOFT) {
+ CHECK_UPDATE_BP_1("soft,");
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_PROFILES) {
+ btrfs_describe_block_groups(bargs->profiles, tmp_buf,
+ sizeof(tmp_buf));
+ CHECK_UPDATE_BP_2("profiles=%s,", tmp_buf);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_USAGE) {
+ CHECK_UPDATE_BP_2("usage=%llu,", bargs->usage);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_USAGE_RANGE) {
+ CHECK_UPDATE_BP_3("usage=%u..%u,",
+ bargs->usage_min, bargs->usage_max);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_DEVID) {
+ CHECK_UPDATE_BP_2("devid=%llu,", bargs->devid);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_DRANGE) {
+ CHECK_UPDATE_BP_3("drange=%llu..%llu,",
+ bargs->pstart, bargs->pend);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_VRANGE) {
+ CHECK_UPDATE_BP_3("vrange%llu..%llu,",
+ bargs->vstart, bargs->vend);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_LIMIT) {
+ CHECK_UPDATE_BP_2("limit=%llu,", bargs->limit);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_LIMIT_RANGE) {
+ CHECK_UPDATE_BP_3("limit=%u..%u,",
+ bargs->limit_min, bargs->limit_max);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_STRIPES_RANGE) {
+ CHECK_UPDATE_BP_3("stripes=%u..%u,",
+ bargs->stripes_min, bargs->stripes_max);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_CONVERT) {
+ int index = btrfs_bg_flags_to_raid_index(bargs->target);
+
+ CHECK_UPDATE_BP_2("convert=%s,", get_raid_name(index));
+ }
+
+out:
+#undef CHECK_UPDATE_BP_3
+#undef CHECK_UPDATE_BP_2
+#undef CHECK_UPDATE_BP_1
+
+ if (size_bp < size_buf)
+ buf[size_buf - size_bp - 1] = '\0'; /* remove last , */
+ else
+ buf[0] = '\0';
+}
+
+static void describe_balance_start_or_resume(struct btrfs_fs_info *fs_info)
+{
+ u32 size_buf = 1024;
+ char tmp_buf[192] = {'\0'};
+ char *buf;
+ char *bp;
+ u32 size_bp = size_buf;
+ int ret;
+ struct btrfs_balance_control *bctl = fs_info->balance_ctl;
+
+ buf = kzalloc(size_buf, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ bp = buf;
+#define CHECK_UPDATE_BP_1(a) \
+ do { \
+ ret = snprintf(bp, size_bp, a); \
+ if (ret < 0 || ret >= size_bp) \
+ return; \
+ size_bp -= ret; \
+ bp += ret; \
+ } while (0)
+
+#define CHECK_UPDATE_BP_2(a, v1) \
+ do { \
+ ret = snprintf(bp, size_bp, a, v1); \
+ if (ret < 0 || ret >= size_bp) \
+ return; \
+ size_bp -= ret; \
+ bp += ret; \
+ } while (0)
+
+ if (bctl->flags & BTRFS_BALANCE_FORCE) {
+ CHECK_UPDATE_BP_1("-f ");
+ }
+
+ if (bctl->flags & BTRFS_BALANCE_DATA) {
+ describe_balance_args(&bctl->data, tmp_buf, sizeof(tmp_buf));
+ CHECK_UPDATE_BP_2("-d%s ", tmp_buf);
+ }
+
+ if (bctl->flags & BTRFS_BALANCE_METADATA) {
+ describe_balance_args(&bctl->meta, tmp_buf, sizeof(tmp_buf));
+ CHECK_UPDATE_BP_2("-m%s ", tmp_buf);
+ }
+
+ if (bctl->flags & BTRFS_BALANCE_SYSTEM) {
+ describe_balance_args(&bctl->sys, tmp_buf, sizeof(tmp_buf));
+ CHECK_UPDATE_BP_2("-s%s ", tmp_buf);
+ }
+
+#undef CHECK_UPDATE_BP_2
+#undef CHECK_UPDATE_BP_1
+
+ if (size_bp < size_buf)
+ buf[size_buf - size_bp - 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
*/
@@ -3893,6 +4060,7 @@ 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);
@@ -3930,10 +4098,8 @@ 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;
--
1.8.3.1
