diff options
| author | Jan Kara <jack@suse.cz> | 2021-05-25 17:07:48 +0300 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2021-06-07 13:11:24 +0300 |
| commit | 64c2c2c62f92339b176ea24403d8db16db36f9e6 (patch) | |
| tree | dbe1ee81ca112e1b0f6e7c971fc29e6d0f217c0e /include/linux/syscalls.h | |
| parent | 21e4e15a846f86643a43c291cbed5dca3639fc2b (diff) | |
| download | linux-64c2c2c62f92339b176ea24403d8db16db36f9e6.tar.xz | |
quota: Change quotactl_path() systcall to an fd-based one
Some users have pointed out that path-based syscalls are problematic in
some environments and at least directory fd argument and possibly also
resolve flags are desirable for such syscalls. Rather than
reimplementing all details of pathname lookup and following where it may
eventually evolve, let's go for full file descriptor based syscall
similar to how ioctl(2) works since the beginning. Managing of quotas
isn't performance sensitive so the extra overhead of open does not
matter and we are able to consume O_PATH descriptors as well which makes
open cheap anyway. Also for frequent operations (such as retrieving
usage information for all users) we can reuse single fd and in fact get
even better performance as well as avoiding races with possible remounts
etc.
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'include/linux/syscalls.h')
| -rw-r--r-- | include/linux/syscalls.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index 050511e8f1f8..586128d5c3b8 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -485,8 +485,8 @@ asmlinkage long sys_pipe2(int __user *fildes, int flags); /* fs/quota.c */ asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special, qid_t id, void __user *addr); -asmlinkage long sys_quotactl_path(unsigned int cmd, const char __user *mountpoint, - qid_t id, void __user *addr); +asmlinkage long sys_quotactl_fd(unsigned int fd, unsigned int cmd, qid_t id, + void __user *addr); /* fs/readdir.c */ asmlinkage long sys_getdents64(unsigned int fd, |