Implement FS_IOC_GETFLAGS and FS_IOC_SETFLAGS. Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx> --- fs/overlayfs/file.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c index 069599d53511..3f610a5b38e4 100644 --- a/fs/overlayfs/file.c +++ b/fs/overlayfs/file.c @@ -8,6 +8,7 @@ #include <linux/cred.h> #include <linux/file.h> +#include <linux/mount.h> #include <linux/xattr.h> #include <linux/uio.h> #include "overlayfs.h" @@ -305,6 +306,82 @@ static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len return ret; } +static long ovl_real_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct fd real; + const struct cred *old_cred; + long ret; + + ret = ovl_real_fdget(file, &real); + if (ret) + return ret; + + old_cred = ovl_override_creds(file_inode(file)->i_sb); + ret = vfs_ioctl(real.file, cmd, arg); + revert_creds(old_cred); + + fdput(real); + + return ret; +} + +static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + long ret; + struct inode *inode = file_inode(file); + + switch (cmd) { + case FS_IOC_GETFLAGS: + ret = ovl_real_ioctl(file, cmd, arg); + break; + + case FS_IOC_SETFLAGS: + if (!inode_owner_or_capable(inode)) + return -EACCES; + + ret = mnt_want_write_file(file); + if (ret) + return ret; + + ret = ovl_copy_up(file_dentry(file)); + if (!ret) { + ret = ovl_real_ioctl(file, cmd, arg); + + inode_lock(inode); + ovl_copyflags(ovl_inode_real(inode), inode); + inode_unlock(inode); + } + + mnt_drop_write_file(file); + break; + + default: + ret = -ENOTTY; + } + + return ret; +} + +static long ovl_compat_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + switch (cmd) { + case FS_IOC32_GETFLAGS: + cmd = FS_IOC_GETFLAGS; + break; + + case FS_IOC32_SETFLAGS: + cmd = FS_IOC_SETFLAGS; + break; + + default: + return -ENOIOCTLCMD; + } + + return ovl_ioctl(file, cmd, arg); +} + const struct file_operations ovl_file_operations = { .open = ovl_open, .release = ovl_release, @@ -314,4 +391,6 @@ const struct file_operations ovl_file_operations = { .fsync = ovl_fsync, .mmap = ovl_mmap, .fallocate = ovl_fallocate, + .unlocked_ioctl = ovl_ioctl, + .compat_ioctl = ovl_compat_ioctl, }; -- 2.14.3