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author | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-09 07:02:06 +0300 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-09 07:02:06 +0300 |
commit | fe3cce2e01ef7a2796c9674b1ec3a28a85f53547 (patch) | |
tree | 2b0ed822eaf7f1b508915106dea550d8ae3e1b69 /lib | |
parent | 237dae889051ed4ebf438b08ca6c0e7c54b97774 (diff) | |
parent | bc917be8105993c256338ad1189650364a741483 (diff) | |
download | linux-fe3cce2e01ef7a2796c9674b1ec3a28a85f53547.tar.xz |
Merge branch 'iov_iter' into for-davem
Diffstat (limited to 'lib')
-rw-r--r-- | lib/iov_iter.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 9d96e283520c..fc6e33f6b7f3 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -766,3 +766,60 @@ const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags) flags); } EXPORT_SYMBOL(dup_iter); + +int import_iovec(int type, const struct iovec __user * uvector, + unsigned nr_segs, unsigned fast_segs, + struct iovec **iov, struct iov_iter *i) +{ + ssize_t n; + struct iovec *p; + n = rw_copy_check_uvector(type, uvector, nr_segs, fast_segs, + *iov, &p); + if (n < 0) { + if (p != *iov) + kfree(p); + *iov = NULL; + return n; + } + iov_iter_init(i, type, p, nr_segs, n); + *iov = p == *iov ? NULL : p; + return 0; +} +EXPORT_SYMBOL(import_iovec); + +#ifdef CONFIG_COMPAT +#include <linux/compat.h> + +int compat_import_iovec(int type, const struct compat_iovec __user * uvector, + unsigned nr_segs, unsigned fast_segs, + struct iovec **iov, struct iov_iter *i) +{ + ssize_t n; + struct iovec *p; + n = compat_rw_copy_check_uvector(type, uvector, nr_segs, fast_segs, + *iov, &p); + if (n < 0) { + if (p != *iov) + kfree(p); + *iov = NULL; + return n; + } + iov_iter_init(i, type, p, nr_segs, n); + *iov = p == *iov ? NULL : p; + return 0; +} +#endif + +int import_single_range(int rw, void __user *buf, size_t len, + struct iovec *iov, struct iov_iter *i) +{ + if (len > MAX_RW_COUNT) + len = MAX_RW_COUNT; + if (unlikely(!access_ok(!rw, buf, len))) + return -EFAULT; + + iov->iov_base = buf; + iov->iov_len = len; + iov_iter_init(i, rw, iov, 1, len); + return 0; +} |