VFS: factor out three helpers for FIBMAP/FIONBIO/FIOASYNC file ioctls
Factor out file-specific ioctl code into smaller helper functions, away from file_ioctl(). This helps code readability and also reduces indentation inside case statements. Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Родитель
deb21db778
Коммит
aa81a7c712
123
fs/ioctl.c
123
fs/ioctl.c
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@ -52,32 +52,34 @@ long vfs_ioctl(struct file *filp, unsigned int cmd,
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return error;
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}
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static int file_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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static int ioctl_fibmap(struct file *filp, int __user *p)
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{
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int error;
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int block;
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struct inode *inode = filp->f_path.dentry->d_inode;
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int __user *p = (int __user *)arg;
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switch (cmd) {
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case FIBMAP:
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{
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struct address_space *mapping = filp->f_mapping;
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int res;
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int res, block;
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/* do we support this mess? */
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if (!mapping->a_ops->bmap)
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return -EINVAL;
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if (!capable(CAP_SYS_RAWIO))
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return -EPERM;
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error = get_user(block, p);
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if (error)
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return error;
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res = get_user(block, p);
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if (res)
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return res;
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lock_kernel();
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res = mapping->a_ops->bmap(mapping, block);
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unlock_kernel();
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return put_user(res, p);
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}
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}
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static int file_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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struct inode *inode = filp->f_path.dentry->d_inode;
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int __user *p = (int __user *)arg;
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switch (cmd) {
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case FIBMAP:
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return ioctl_fibmap(filp, p);
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case FIGETBSZ:
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return put_user(inode->i_sb->s_blocksize, p);
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case FIONREAD:
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@ -87,6 +89,57 @@ static int file_ioctl(struct file *filp, unsigned int cmd,
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return vfs_ioctl(filp, cmd, arg);
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}
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static int ioctl_fionbio(struct file *filp, int __user *argp)
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{
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unsigned int flag;
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int on, error;
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error = get_user(on, argp);
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if (error)
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return error;
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flag = O_NONBLOCK;
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#ifdef __sparc__
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/* SunOS compatibility item. */
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if (O_NONBLOCK != O_NDELAY)
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flag |= O_NDELAY;
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#endif
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if (on)
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filp->f_flags |= flag;
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else
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filp->f_flags &= ~flag;
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return error;
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}
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static int ioctl_fioasync(unsigned int fd, struct file *filp,
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int __user *argp)
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{
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unsigned int flag;
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int on, error;
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error = get_user(on, argp);
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if (error)
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return error;
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flag = on ? FASYNC : 0;
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/* Did FASYNC state change ? */
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if ((flag ^ filp->f_flags) & FASYNC) {
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if (filp->f_op && filp->f_op->fasync) {
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lock_kernel();
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error = filp->f_op->fasync(fd, filp, on);
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unlock_kernel();
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} else
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error = -ENOTTY;
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}
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if (error)
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return error;
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if (on)
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filp->f_flags |= FASYNC;
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else
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filp->f_flags &= ~FASYNC;
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return error;
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}
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/*
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* When you add any new common ioctls to the switches above and below
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* please update compat_sys_ioctl() too.
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@ -97,8 +150,8 @@ static int file_ioctl(struct file *filp, unsigned int cmd,
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int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
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unsigned long arg)
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{
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unsigned int flag;
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int on, error = 0;
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int error = 0;
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int __user *argp = (int __user *)arg;
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switch (cmd) {
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case FIOCLEX:
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@ -110,43 +163,11 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
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break;
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case FIONBIO:
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error = get_user(on, (int __user *)arg);
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if (error)
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break;
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flag = O_NONBLOCK;
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#ifdef __sparc__
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/* SunOS compatibility item. */
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if (O_NONBLOCK != O_NDELAY)
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flag |= O_NDELAY;
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#endif
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if (on)
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filp->f_flags |= flag;
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else
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filp->f_flags &= ~flag;
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error = ioctl_fionbio(filp, argp);
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break;
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case FIOASYNC:
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error = get_user(on, (int __user *)arg);
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if (error)
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break;
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flag = on ? FASYNC : 0;
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/* Did FASYNC state change ? */
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if ((flag ^ filp->f_flags) & FASYNC) {
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if (filp->f_op && filp->f_op->fasync) {
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lock_kernel();
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error = filp->f_op->fasync(fd, filp, on);
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unlock_kernel();
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} else
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error = -ENOTTY;
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}
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if (error != 0)
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break;
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if (on)
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filp->f_flags |= FASYNC;
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else
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filp->f_flags &= ~FASYNC;
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error = ioctl_fioasync(fd, filp, argp);
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break;
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case FIOQSIZE:
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