binder: Add stats, state and transactions files
The following binder stat files currently live in debugfs. /sys/kernel/debug/binder/state /sys/kernel/debug/binder/stats /sys/kernel/debug/binder/transactions This patch makes these files available in a binderfs instance mounted with the mount option 'stats=global'. For example, if a binderfs instance is mounted at path /dev/binderfs, the above files will be available at the following locations: /dev/binderfs/binder_logs/state /dev/binderfs/binder_logs/stats /dev/binderfs/binder_logs/transactions This provides a way to access them even when debugfs is not mounted. Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Hridya Valsaraju <hridya@google.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/r/20190903161655.107408-3-hridya@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hridya Valsaraju
Greg Kroah-Hartman
Родитель
f00834518e
Коммит
0e13e452da
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@ -5907,7 +5907,7 @@ static void print_binder_proc_stats(struct seq_file *m,
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}
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static int state_show(struct seq_file *m, void *unused)
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int binder_state_show(struct seq_file *m, void *unused)
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{
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struct binder_proc *proc;
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struct binder_node *node;
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@ -5946,7 +5946,7 @@ static int state_show(struct seq_file *m, void *unused)
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return 0;
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}
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static int stats_show(struct seq_file *m, void *unused)
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int binder_stats_show(struct seq_file *m, void *unused)
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{
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struct binder_proc *proc;
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@ -5962,7 +5962,7 @@ static int stats_show(struct seq_file *m, void *unused)
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return 0;
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}
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static int transactions_show(struct seq_file *m, void *unused)
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int binder_transactions_show(struct seq_file *m, void *unused)
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{
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struct binder_proc *proc;
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@ -6050,9 +6050,6 @@ const struct file_operations binder_fops = {
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.release = binder_release,
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};
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DEFINE_SHOW_ATTRIBUTE(state);
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DEFINE_SHOW_ATTRIBUTE(stats);
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DEFINE_SHOW_ATTRIBUTE(transactions);
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DEFINE_SHOW_ATTRIBUTE(transaction_log);
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static int __init init_binder_device(const char *name)
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@ -6108,17 +6105,17 @@ static int __init binder_init(void)
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0444,
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binder_debugfs_dir_entry_root,
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NULL,
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&state_fops);
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&binder_state_fops);
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debugfs_create_file("stats",
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0444,
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binder_debugfs_dir_entry_root,
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NULL,
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&stats_fops);
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&binder_stats_fops);
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debugfs_create_file("transactions",
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0444,
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binder_debugfs_dir_entry_root,
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NULL,
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&transactions_fops);
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&binder_transactions_fops);
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debugfs_create_file("transaction_log",
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0444,
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binder_debugfs_dir_entry_root,
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@ -57,4 +57,12 @@ static inline int __init init_binderfs(void)
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}
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#endif
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int binder_stats_show(struct seq_file *m, void *unused);
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DEFINE_SHOW_ATTRIBUTE(binder_stats);
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int binder_state_show(struct seq_file *m, void *unused);
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DEFINE_SHOW_ATTRIBUTE(binder_state);
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int binder_transactions_show(struct seq_file *m, void *unused);
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DEFINE_SHOW_ATTRIBUTE(binder_transactions);
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#endif /* _LINUX_BINDER_INTERNAL_H */
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@ -280,7 +280,7 @@ static void binderfs_evict_inode(struct inode *inode)
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clear_inode(inode);
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if (!device)
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if (!S_ISCHR(inode->i_mode) || !device)
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return;
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mutex_lock(&binderfs_minors_mutex);
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@ -502,6 +502,141 @@ static const struct inode_operations binderfs_dir_inode_operations = {
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.unlink = binderfs_unlink,
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};
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static struct inode *binderfs_make_inode(struct super_block *sb, int mode)
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{
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struct inode *ret;
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ret = new_inode(sb);
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if (ret) {
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ret->i_ino = iunique(sb, BINDERFS_MAX_MINOR + INODE_OFFSET);
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ret->i_mode = mode;
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ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
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}
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return ret;
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}
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static struct dentry *binderfs_create_dentry(struct dentry *parent,
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const char *name)
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{
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struct dentry *dentry;
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dentry = lookup_one_len(name, parent, strlen(name));
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if (IS_ERR(dentry))
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return dentry;
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/* Return error if the file/dir already exists. */
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if (d_really_is_positive(dentry)) {
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dput(dentry);
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return ERR_PTR(-EEXIST);
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}
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return dentry;
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}
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static struct dentry *binderfs_create_file(struct dentry *parent,
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const char *name,
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const struct file_operations *fops,
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void *data)
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{
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struct dentry *dentry;
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struct inode *new_inode, *parent_inode;
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struct super_block *sb;
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parent_inode = d_inode(parent);
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inode_lock(parent_inode);
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dentry = binderfs_create_dentry(parent, name);
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if (IS_ERR(dentry))
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goto out;
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sb = parent_inode->i_sb;
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new_inode = binderfs_make_inode(sb, S_IFREG | 0444);
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if (!new_inode) {
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dput(dentry);
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dentry = ERR_PTR(-ENOMEM);
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goto out;
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}
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new_inode->i_fop = fops;
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new_inode->i_private = data;
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d_instantiate(dentry, new_inode);
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fsnotify_create(parent_inode, dentry);
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out:
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inode_unlock(parent_inode);
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return dentry;
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}
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static struct dentry *binderfs_create_dir(struct dentry *parent,
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const char *name)
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{
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struct dentry *dentry;
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struct inode *new_inode, *parent_inode;
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struct super_block *sb;
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parent_inode = d_inode(parent);
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inode_lock(parent_inode);
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dentry = binderfs_create_dentry(parent, name);
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if (IS_ERR(dentry))
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goto out;
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sb = parent_inode->i_sb;
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new_inode = binderfs_make_inode(sb, S_IFDIR | 0755);
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if (!new_inode) {
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dput(dentry);
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dentry = ERR_PTR(-ENOMEM);
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goto out;
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}
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new_inode->i_fop = &simple_dir_operations;
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new_inode->i_op = &simple_dir_inode_operations;
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set_nlink(new_inode, 2);
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d_instantiate(dentry, new_inode);
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inc_nlink(parent_inode);
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fsnotify_mkdir(parent_inode, dentry);
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out:
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inode_unlock(parent_inode);
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return dentry;
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}
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static int init_binder_logs(struct super_block *sb)
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{
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struct dentry *binder_logs_root_dir, *dentry;
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int ret = 0;
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binder_logs_root_dir = binderfs_create_dir(sb->s_root,
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"binder_logs");
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if (IS_ERR(binder_logs_root_dir)) {
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ret = PTR_ERR(binder_logs_root_dir);
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goto out;
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}
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dentry = binderfs_create_file(binder_logs_root_dir, "stats",
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&binder_stats_fops, NULL);
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if (IS_ERR(dentry)) {
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ret = PTR_ERR(dentry);
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goto out;
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}
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dentry = binderfs_create_file(binder_logs_root_dir, "state",
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&binder_state_fops, NULL);
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if (IS_ERR(dentry)) {
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ret = PTR_ERR(dentry);
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goto out;
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}
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dentry = binderfs_create_file(binder_logs_root_dir, "transactions",
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&binder_transactions_fops, NULL);
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if (IS_ERR(dentry))
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ret = PTR_ERR(dentry);
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out:
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return ret;
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}
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static int binderfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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int ret;
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@ -579,6 +714,9 @@ static int binderfs_fill_super(struct super_block *sb, void *data, int silent)
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name++;
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}
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if (info->mount_opts.stats_mode == STATS_GLOBAL)
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return init_binder_logs(sb);
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return 0;
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}
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