diff options
| author | Zhai Zhaoxuan <kxuanobj@gmail.com> | 2017-12-28 21:56:06 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-08 16:37:18 +0100 |
| commit | a941f70e55471367de8e9c3cc44b47303ba1a87d (patch) | |
| tree | 8ba1318a43c759e50e5da47826f408850975c1d8 /drivers/staging/android/ashmem.c | |
| parent | 6724ed7f28d6e83956a7219a9a02a4d620ef65d8 (diff) | |
staging: android: ashmem: add procfs fdinfo helper
This print the inode number of backing file and the name in
/proc/pid/fdinfo/fd.
These information helps users to know which processes are sharing the same
ashmem.
Signed-off-by: Zhai Zhaoxuan <kxuanobj@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/android/ashmem.c')
| -rw-r--r-- | drivers/staging/android/ashmem.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c index 4e8947923904..425c49f9330c 100644 --- a/drivers/staging/android/ashmem.c +++ b/drivers/staging/android/ashmem.c @@ -808,7 +808,23 @@ static long compat_ashmem_ioctl(struct file *file, unsigned int cmd, return ashmem_ioctl(file, cmd, arg); } #endif +#ifdef CONFIG_PROC_FS +static void ashmem_show_fdinfo(struct seq_file *m, struct file *file) +{ + struct ashmem_area *asma = file->private_data; + + mutex_lock(&ashmem_mutex); + + if (asma->file) + seq_printf(m, "inode:\t%ld\n", file_inode(asma->file)->i_ino); + if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0') + seq_printf(m, "name:\t%s\n", + asma->name + ASHMEM_NAME_PREFIX_LEN); + + mutex_unlock(&ashmem_mutex); +} +#endif static const struct file_operations ashmem_fops = { .owner = THIS_MODULE, .open = ashmem_open, @@ -820,6 +836,9 @@ static const struct file_operations ashmem_fops = { #ifdef CONFIG_COMPAT .compat_ioctl = compat_ashmem_ioctl, #endif +#ifdef CONFIG_PROC_FS + .show_fdinfo = ashmem_show_fdinfo, +#endif }; static struct miscdevice ashmem_misc = { |