diff options
author | Mark Brown <broonie@kernel.org> | 2019-04-02 16:20:47 +0700 |
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committer | Mark Brown <broonie@kernel.org> | 2019-04-02 16:20:47 +0700 |
commit | 6d5e2bf9d203e4d9e08ca2e9420c6ff22ad190af (patch) | |
tree | c2c20648773d3326f942e34ef73b06566f7a19ec /include/linux/uio.h | |
parent | b820d52e7eed7b30b2dfef5f4213a2bc3cbea6f3 (diff) | |
parent | 257f9053c0204ea47491aa236004fd1226f75fa8 (diff) |
Merge branch 'acpi-utils' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm into asoc-5.2
Diffstat (limited to 'include/linux/uio.h')
-rw-r--r-- | include/linux/uio.h | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/include/linux/uio.h b/include/linux/uio.h index 87477e1640f9..f184af1999a8 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -23,14 +23,23 @@ struct kvec { }; enum iter_type { - ITER_IOVEC = 0, - ITER_KVEC = 2, - ITER_BVEC = 4, - ITER_PIPE = 8, - ITER_DISCARD = 16, + /* set if ITER_BVEC doesn't hold a bv_page ref */ + ITER_BVEC_FLAG_NO_REF = 2, + + /* iter types */ + ITER_IOVEC = 4, + ITER_KVEC = 8, + ITER_BVEC = 16, + ITER_PIPE = 32, + ITER_DISCARD = 64, }; struct iov_iter { + /* + * Bit 0 is the read/write bit, set if we're writing. + * Bit 1 is the BVEC_FLAG_NO_REF bit, set if type is a bvec and + * the caller isn't expecting to drop a page reference when done. + */ unsigned int type; size_t iov_offset; size_t count; @@ -84,6 +93,11 @@ static inline unsigned char iov_iter_rw(const struct iov_iter *i) return i->type & (READ | WRITE); } +static inline bool iov_iter_bvec_no_ref(const struct iov_iter *i) +{ + return (i->type & ITER_BVEC_FLAG_NO_REF) != 0; +} + /* * Total number of bytes covered by an iovec. * |