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fs: Add new pre-allocation ioctls to vfs for compatibility with legacy xfs ioctls

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This patch adds ioctls to vfs for compatibility with legacy XFS
pre-allocation ioctls (XFS_IOC_*RESVP*). The implementation
effectively invokes sys_fallocate for the new ioctls.
Also handles the compat_ioctl case.
Note: These legacy ioctls are also implemented by OCFS2.

[AV: folded fixes from hch]

Signed-off-by: Ankit Jain <me@ankitjain.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Ankit Jain 2009-06-19 14:28:07 -04:00 • committed by Al Viro
parent 01c031945f
commit 3e63cbb1ef
5 changed files with 139 additions and 29 deletions
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58
fs/open.c
View file

@ -378,63 +378,63 @@ SYSCALL_ALIAS(sys_ftruncate64, SyS_ftruncate64);
#endif
#endif /* BITS_PER_LONG == 32 */
SYSCALL_DEFINE(fallocate)(int fd, int mode, loff_t offset, loff_t len)
int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
{
struct file *file;
struct inode *inode;
long ret = -EINVAL;
struct inode *inode = file->f_path.dentry->d_inode;
long ret;
if (offset < 0 || len <= 0)
goto out;
return -EINVAL;
/* Return error if mode is not supported */
ret = -EOPNOTSUPP;
if (mode && !(mode & FALLOC_FL_KEEP_SIZE))
goto out;
return -EOPNOTSUPP;
ret = -EBADF;
file = fget(fd);
if (!file)
goto out;
if (!(file->f_mode & FMODE_WRITE))
goto out_fput;
return -EBADF;
/*
* Revalidate the write permissions, in case security policy has
* changed since the files were opened.
*/
ret = security_file_permission(file, MAY_WRITE);
if (ret)
goto out_fput;
return ret;
inode = file->f_path.dentry->d_inode;
ret = -ESPIPE;
if (S_ISFIFO(inode->i_mode))
goto out_fput;
return -ESPIPE;
ret = -ENODEV;
/*
* Let individual file system decide if it supports preallocation
* for directories or not.
*/
if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
goto out_fput;
return -ENODEV;
ret = -EFBIG;
/* Check for wrap through zero too */
if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0))
goto out_fput;
return -EFBIG;
if (inode->i_op->fallocate)
ret = inode->i_op->fallocate(inode, mode, offset, len);
else
ret = -EOPNOTSUPP;
if (!inode->i_op->fallocate)
return -EOPNOTSUPP;
out_fput:
fput(file);
out:
return ret;
return inode->i_op->fallocate(inode, mode, offset, len);
}
SYSCALL_DEFINE(fallocate)(int fd, int mode, loff_t offset, loff_t len)
{
struct file *file;
int error = -EBADF;
file = fget(fd);
if (file) {
error = do_fallocate(file, mode, offset, len);
fput(file);
}
return error;
}
#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
asmlinkage long SyS_fallocate(long fd, long mode, loff_t offset, loff_t len)
{