'btrfs file du' is a very useful tool to watch my system
file usage with snapshot aware.
when trying to run following commands:
[root@localhost btrfs-progs]# btrfs file du /
Total Exclusive Set shared Filename
ERROR: Failed to lookup root id - Inappropriate ioctl for device
ERROR: cannot check space of '/': Unknown error -1
and My Filesystem looks like this:
[root@localhost btrfs-progs]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 16G 0 16G 0% /dev
tmpfs tmpfs 16G 368K 16G 1% /dev/shm
tmpfs tmpfs 16G 1.4M 16G 1% /run
tmpfs tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/sda3 btrfs 60G 19G 40G 33% /
tmpfs tmpfs 16G 332K 16G 1% /tmp
/dev/sdc btrfs 2.8T 166G 1.7T 9% /data
/dev/sda2 xfs 2.0G 452M 1.6G 23% /boot
/dev/sda1 vfat 1.9G 11M 1.9G 1% /boot/efi
tmpfs tmpfs 3.2G 24K 3.2G 1% /run/user/1000
So I installed Btrfs as my root partition, but boot partition
can be other fs.
We can Let btrfs tool aware of this is not a btrfs file or
directory and skip those files, so that someone like me
could just run 'btrfs file du /' to scan all btrfs filesystems.
After patch, it will look like:
Total Exclusive Set shared Filename
skipping not btrfs dir/file: boot
skipping not btrfs dir/file: dev
skipping not btrfs dir/file: proc
skipping not btrfs dir/file: run
skipping not btrfs dir/file: sys
0.00B 0.00B - //root/.bash_logout
0.00B 0.00B - //root/.bash_profile
0.00B 0.00B - //root/.bashrc
0.00B 0.00B - //root/.cshrc
0.00B 0.00B - //root/.tcshrc
This works for me to analysis system usage and analysis
performaces.
Signed-off-by: Wang Shilong <wangshilong1...@gmail.com>
---
cmds-fi-du.c | 11 ++++++++++-
cmds-inspect.c | 2 +-
utils.c | 8 ++++----
3 files changed, 15 insertions(+), 6 deletions(-)
diff --git a/cmds-fi-du.c b/cmds-fi-du.c
index 12855a5..bf0e62c 100644
--- a/cmds-fi-du.c
+++ b/cmds-fi-du.c
@@ -389,8 +389,17 @@ static int du_walk_dir(struct du_dir_ctxt *ctxt, struct
rb_root *shared_extents)
dirfd(dirstream),
shared_extents, &tot, &shr,
0);
- if (ret)
+ if (ret == -ENOTTY) {
+ fprintf(stdout,
+ "skipping not btrfs dir/file:
%s\n",
+ entry->d_name);
+ continue;
+ } else if (ret) {
+ fprintf(stderr,
+ "failed to walk dir/file: %s
:%s\n",
+ entry->d_name, strerror(-ret));
break;
+ }
ctxt->bytes_total += tot;
ctxt->bytes_shared += shr;
diff --git a/cmds-inspect.c b/cmds-inspect.c
index dd7b9dd..2ae44be 100644
--- a/cmds-inspect.c
+++ b/cmds-inspect.c
@@ -323,7 +323,7 @@ static int cmd_inspect_rootid(int argc, char **argv)
ret = lookup_ino_rootid(fd, &rootid);
if (ret) {
- error("rootid failed with ret=%d", ret);
+ error("failed to lookup root id: %s", strerror(-ret));
goto out;
}
diff --git a/utils.c b/utils.c
index 578fdb0..f73b048 100644
--- a/utils.c
+++ b/utils.c
@@ -2815,6 +2815,8 @@ path:
if (fd < 0)
goto err;
ret = lookup_ino_rootid(fd, &id);
+ if (ret)
+ error("failed to lookup root id: %s", strerror(-ret));
close(fd);
if (ret < 0)
goto err;
@@ -3497,10 +3499,8 @@ int lookup_ino_rootid(int fd, u64 *rootid)
args.objectid = BTRFS_FIRST_FREE_OBJECTID;
ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
- if (ret < 0) {
- error("failed to lookup root id: %s", strerror(errno));
- return ret;
- }
+ if (ret < 0)
+ return -errno;
*rootid = args.treeid;
--
2.7.4
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