preadv/pwritev: Add preadv and pwritev system calls.

[linux-2.6-block.git] / fs / compat.c

diff --git a/fs/compat.c b/fs/compat.c
index 55efdfebdf5ae14f5937add03075fdc8e716819d..7c1615183d1ec6b6e7f94562c03c83501b770195 100644 (file)
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1195,16 +1195,12 @@ out:
        return ret;
 }
 
-asmlinkage ssize_t
-compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
+static size_t compat_readv(struct file *file,
+                          const struct compat_iovec __user *vec,
+                          unsigned long vlen, loff_t *pos)
 {
-       struct file *file;
        ssize_t ret = -EBADF;
 
-       file = fget(fd);
-       if (!file)
-               return -EBADF;
-
        if (!(file->f_mode & FMODE_READ))
                goto out;
 
@@ -1212,25 +1208,54 @@ compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsign
        if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
                goto out;
 
-       ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
+       ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
 
 out:
        if (ret > 0)
                add_rchar(current, ret);
        inc_syscr(current);
+       return ret;
+}
+
+asmlinkage ssize_t
+compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
+                unsigned long vlen)
+{
+       struct file *file;
+       ssize_t ret;
+
+       file = fget(fd);
+       if (!file)
+               return -EBADF;
+       ret = compat_readv(file, vec, vlen, &file->f_pos);
        fput(file);
        return ret;
 }
 
 asmlinkage ssize_t
-compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
+compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
+                 unsigned long vlen, u32 pos_high, u32 pos_low)
 {
+       loff_t pos = ((loff_t)pos_high << 32) | pos_low;
        struct file *file;
-       ssize_t ret = -EBADF;
+       ssize_t ret;
 
+       if (pos < 0)
+               return -EINVAL;
        file = fget(fd);
        if (!file)
                return -EBADF;
+       ret = compat_readv(file, vec, vlen, &pos);
+       fput(file);
+       return ret;
+}
+
+static size_t compat_writev(struct file *file,
+                           const struct compat_iovec __user *vec,
+                           unsigned long vlen, loff_t *pos)
+{
+       ssize_t ret = -EBADF;
+
        if (!(file->f_mode & FMODE_WRITE))
                goto out;
 
@@ -1238,12 +1263,44 @@ compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsig
        if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
                goto out;
 
-       ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
+       ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
 
 out:
        if (ret > 0)
                add_wchar(current, ret);
        inc_syscw(current);
+       return ret;
+}
+
+asmlinkage ssize_t
+compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
+                 unsigned long vlen)
+{
+       struct file *file;
+       ssize_t ret;
+
+       file = fget(fd);
+       if (!file)
+               return -EBADF;
+       ret = compat_writev(file, vec, vlen, &file->f_pos);
+       fput(file);
+       return ret;
+}
+
+asmlinkage ssize_t
+compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
+                  unsigned long vlen, u32 pos_high, u32 pos_low)
+{
+       loff_t pos = ((loff_t)pos_high << 32) | pos_low;
+       struct file *file;
+       ssize_t ret;
+
+       if (pos < 0)
+               return -EINVAL;
+       file = fget(fd);
+       if (!file)
+               return -EBADF;
+       ret = compat_writev(file, vec, vlen, &pos);
        fput(file);
        return ret;
 }