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

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>

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index c135202..626c748 100644 (file)
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -31,6 +31,7 @@
 #include <linux/skbuff.h>
 #include <linux/netlink.h>
 #include <linux/vt.h>
+#include <linux/falloc.h>
 #include <linux/fs.h>
 #include <linux/file.h>
 #include <linux/ppp_defs.h>
@@ -1779,6 +1780,41 @@ lp_timeout_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
        return sys_ioctl(fd, cmd, (unsigned long)tn);
 }
 
+/* on ia32 l_start is on a 32-bit boundary */
+#if defined(CONFIG_IA64) || defined(CONFIG_X86_64)
+struct space_resv_32 {
+       __s16           l_type;
+       __s16           l_whence;
+       __s64           l_start __attribute__((packed));
+                       /* len == 0 means until end of file */
+       __s64           l_len __attribute__((packed));
+       __s32           l_sysid;
+       __u32           l_pid;
+       __s32           l_pad[4];       /* reserve area */
+};
+
+#define FS_IOC_RESVSP_32               _IOW ('X', 40, struct space_resv_32)
+#define FS_IOC_RESVSP64_32     _IOW ('X', 42, struct space_resv_32)
+
+/* just account for different alignment */
+static int compat_ioctl_preallocate(struct file *file, unsigned long arg)
+{
+       struct space_resv_32    __user *p32 = (void __user *)arg;
+       struct space_resv       __user *p = compat_alloc_user_space(sizeof(*p));
+
+       if (copy_in_user(&p->l_type,    &p32->l_type,   sizeof(s16)) ||
+           copy_in_user(&p->l_whence,  &p32->l_whence, sizeof(s16)) ||
+           copy_in_user(&p->l_start,   &p32->l_start,  sizeof(s64)) ||
+           copy_in_user(&p->l_len,     &p32->l_len,    sizeof(s64)) ||
+           copy_in_user(&p->l_sysid,   &p32->l_sysid,  sizeof(s32)) ||
+           copy_in_user(&p->l_pid,     &p32->l_pid,    sizeof(u32)) ||
+           copy_in_user(&p->l_pad,     &p32->l_pad,    4*sizeof(u32)))
+               return -EFAULT;
+
+       return ioctl_preallocate(file, p);
+}
+#endif
+
 
 typedef int (*ioctl_trans_handler_t)(unsigned int, unsigned int,
                                        unsigned long, struct file *);
@@ -2756,6 +2792,18 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
        case FIOQSIZE:
                break;
 
+#if defined(CONFIG_IA64) || defined(CONFIG_X86_64)
+       case FS_IOC_RESVSP_32:
+       case FS_IOC_RESVSP64_32:
+               error = compat_ioctl_preallocate(filp, arg);
+               goto out_fput;
+#else
+       case FS_IOC_RESVSP:
+       case FS_IOC_RESVSP64:
+               error = ioctl_preallocate(filp, (void __user *)arg);
+               goto out_fput;
+#endif
+
        case FIBMAP:
        case FIGETBSZ:
        case FIONREAD:

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 001f8d3..5612880 100644 (file)
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -15,6 +15,7 @@
 #include <linux/uaccess.h>
 #include <linux/writeback.h>
 #include <linux/buffer_head.h>
+#include <linux/falloc.h>
 
 #include <asm/ioctls.h>
 
@@ -403,6 +404,37 @@ EXPORT_SYMBOL(generic_block_fiemap);
 
 #endif  /*  CONFIG_BLOCK  */
 
+/*
+ * This provides compatibility with legacy XFS pre-allocation ioctls
+ * which predate the fallocate syscall.
+ *
+ * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
+ * are used here, rest are ignored.
+ */
+int ioctl_preallocate(struct file *filp, void __user *argp)
+{
+       struct inode *inode = filp->f_path.dentry->d_inode;
+       struct space_resv sr;
+
+       if (copy_from_user(&sr, argp, sizeof(sr)))
+               return -EFAULT;
+
+       switch (sr.l_whence) {
+       case SEEK_SET:
+               break;
+       case SEEK_CUR:
+               sr.l_start += filp->f_pos;
+               break;
+       case SEEK_END:
+               sr.l_start += i_size_read(inode);
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return do_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
+}
+
 static int file_ioctl(struct file *filp, unsigned int cmd,
                unsigned long arg)
 {
@@ -414,6 +446,9 @@ static int file_ioctl(struct file *filp, unsigned int cmd,
                return ioctl_fibmap(filp, p);
        case FIONREAD:
                return put_user(i_size_read(inode) - filp->f_pos, p);
+       case FS_IOC_RESVSP:
+       case FS_IOC_RESVSP64:
+               return ioctl_preallocate(filp, p);
        }
 
        return vfs_ioctl(filp, cmd, arg);

diff --git a/fs/open.c b/fs/open.c
index 7200e23..dd98e80 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -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)
 {

diff --git a/include/linux/falloc.h b/include/linux/falloc.h
index 8e912ab..3c15510 100644 (file)
--- a/include/linux/falloc.h
+++ b/include/linux/falloc.h
@@ -3,4 +3,25 @@
 
 #define FALLOC_FL_KEEP_SIZE    0x01 /* default is extend size */
 
+#ifdef __KERNEL__
+
+/*
+ * Space reservation ioctls and argument structure
+ * are designed to be compatible with the legacy XFS ioctls.
+ */
+struct space_resv {
+       __s16           l_type;
+       __s16           l_whence;
+       __s64           l_start;
+       __s64           l_len;          /* len == 0 means until end of file */
+       __s32           l_sysid;
+       __u32           l_pid;
+       __s32           l_pad[4];       /* reserved area */
+};
+
+#define FS_IOC_RESVSP          _IOW('X', 40, struct space_resv)
+#define FS_IOC_RESVSP64                _IOW('X', 42, struct space_resv)
+
+#endif /* __KERNEL__ */
+
 #endif /* _FALLOC_H_ */

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1ff5e4e..79e302d 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1906,6 +1906,8 @@ static inline int break_lease(struct inode *inode, unsigned int mode)
 
 extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
                       struct file *filp);
+extern int do_fallocate(struct file *file, int mode, loff_t offset,
+                       loff_t len);
 extern long do_sys_open(int dfd, const char __user *filename, int flags,
                        int mode);
 extern struct file *filp_open(const char *, int, int);
@@ -1914,6 +1916,10 @@ extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
 extern int filp_close(struct file *, fl_owner_t id);
 extern char * getname(const char __user *);
 
+/* fs/ioctl.c */
+
+extern int ioctl_preallocate(struct file *filp, void __user *argp);
+
 /* fs/dcache.c */
 extern void __init vfs_caches_init_early(void);
 extern void __init vfs_caches_init(unsigned long);