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Subject[PATCH v2 6/6] Btrfs: show subvol= and subvolid= in /proc/mounts
Date
Now that we're guaranteed to have a meaningful root dentry, we can just
export seq_dentry() and use it in btrfs_show_options(). The subvolume ID
is easy to get and can also be useful, so put that in there, too.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
---
fs/btrfs/super.c | 4 ++++
fs/seq_file.c | 1 +
2 files changed, 5 insertions(+)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 80a8047..f334cc4 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1193,6 +1193,10 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
seq_puts(seq, ",fatal_errors=panic");
if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL)
seq_printf(seq, ",commit=%d", info->commit_interval);
+ seq_printf(seq, ",subvolid=%llu",
+ BTRFS_I(d_inode(dentry))->root->root_key.objectid);
+ seq_puts(seq, ",subvol=");
+ seq_dentry(seq, dentry, " \t\n\\");
return 0;
}

diff --git a/fs/seq_file.c b/fs/seq_file.c
index 555f821..52b4927 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -538,6 +538,7 @@ int seq_dentry(struct seq_file *m, struct dentry *dentry, const char *esc)

return res;
}
+EXPORT_SYMBOL(seq_dentry);

static void *single_start(struct seq_file *p, loff_t *pos)
{
--
2.3.5


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