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 force D:usage=50,limit=10..20 M:soft,profiles=raid1,convert=single S:soft,profiles=raid1,convert=single Signed-off-by: Anand Jain <anand.j...@oracle.com> --- v4->v4.1a: Rename last missed sz to size_buf. Allocate at least (64*3) 192 bytes for tmp_buf. Log format change: Use CAPS abbreviate for group type, as in the above Example. 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 | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 104 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index e858882a98eb..833dde6168de 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -3809,6 +3809,108 @@ 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 size_buf) +{ + char *bp = buf; + u64 flags = bargs->flags; + char tmp_buf[128]; + + if (!flags) + return 0; + + if (flags & BTRFS_BALANCE_ARGS_SOFT) + bp += snprintf(bp, buf - bp + size_buf, "soft,"); + + if (flags & BTRFS_BALANCE_ARGS_PROFILES) { + btrfs_describe_block_groups(bargs->profiles, tmp_buf, + sizeof(tmp_buf)); + bp += snprintf(bp, buf - bp + size_buf, "profiles=%s,", + tmp_buf); + } + + if (flags & BTRFS_BALANCE_ARGS_USAGE) + bp += snprintf(bp, buf - bp + size_buf, "usage=%llu,", + bargs->usage); + + if (flags & BTRFS_BALANCE_ARGS_USAGE_RANGE) + bp += snprintf(bp, buf - bp + size_buf, "usage=%u..%u,", + bargs->usage_min, bargs->usage_max); + + if (flags & BTRFS_BALANCE_ARGS_DEVID) + bp += snprintf(bp, buf - bp + size_buf, "devid=%llu,", + bargs->devid); + + if (flags & BTRFS_BALANCE_ARGS_DRANGE) + bp += snprintf(bp, buf - bp + size_buf, "drange=%llu..%llu,", + bargs->pstart, bargs->pend); + + if (flags & BTRFS_BALANCE_ARGS_VRANGE) + bp += snprintf(bp, buf - bp + size_buf, "vrange%llu..%llu,", + bargs->vstart, bargs->vend); + + if (flags & BTRFS_BALANCE_ARGS_LIMIT) + bp += snprintf(bp, buf - bp + size_buf, "limit=%llu,", + bargs->limit); + + if (flags & BTRFS_BALANCE_ARGS_LIMIT_RANGE) + bp += snprintf(bp, buf - bp + size_buf, "limit=%u..%u,", + bargs->limit_min, bargs->limit_max); + + if (flags & BTRFS_BALANCE_ARGS_STRIPES_RANGE) + bp += snprintf(bp, buf - bp + size_buf, "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); + + bp += snprintf(bp, buf - bp + size_buf, "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 size_buf = 1024; + char tmp_buf[192]; + char *buf; + char *bp; + struct btrfs_balance_control *bctl = fs_info->balance_ctl; + + buf = kzalloc(size_buf, GFP_KERNEL); + if (!buf) + return; + + bp = buf; + if (bctl->flags & BTRFS_BALANCE_FORCE) + bp += snprintf(bp, buf - bp + size_buf, "force "); + + if (bctl->flags & BTRFS_BALANCE_DATA) { + describe_balance_args(&bctl->data, tmp_buf, sizeof(tmp_buf)); + bp += snprintf(bp, buf - bp + size_buf, "D:%s ", tmp_buf); + } + + if (bctl->flags & BTRFS_BALANCE_METADATA) { + describe_balance_args(&bctl->meta, tmp_buf, sizeof(tmp_buf)); + bp += snprintf(bp, buf - bp + size_buf, "M:%s ", tmp_buf); + } + + if (bctl->flags & BTRFS_BALANCE_SYSTEM) { + describe_balance_args(&bctl->sys, tmp_buf, sizeof(tmp_buf)); + bp += snprintf(bp, buf - bp + size_buf, "S:%s ", 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 */ @@ -3953,6 +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); @@ -3990,10 +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 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html