diff options
author | Jens Axboe <axboe@kernel.dk> | 2022-07-19 21:02:54 -0600 |
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committer | Jens Axboe <axboe@kernel.dk> | 2022-07-19 21:02:54 -0600 |
commit | 1e89db9bd676df24bded8da2053fe24ccfb4587a (patch) | |
tree | adf8ec7eea28238884879a336beb23fae76aed4c /lib | |
parent | ca85855bdcae8f84f1512e88b4c75009ea17ea2f (diff) | |
parent | bf14fad19ffbb3d37a1bb1324f966973e7d4a7b6 (diff) |
Merge branch 'for-5.20/block' into for-5.20/drivers-post
* for-5.20/block: (162 commits)
mmc: fix disk/queue leak in case of adding disk failure
ublk_drv: fix an IS_ERR() vs NULL check
ublk: remove UBLK_IO_F_INTEGRITY
ublk_drv: remove unneeded semicolon
ublk_drv: fix missing error return code in ublk_add_dev()
ublk_drv: fix build warning with -Wmaybe-uninitialized and one sparse warning
blktrace: Fix the blk_fill_rwbs() kernel-doc header
fs/buffer: Fix the ll_rw_block() kernel-doc header
fs/zonefs: Use the enum req_op type for tracing request operations
fs/xfs: Use the enum req_op and blk_opf_t types
PM: Use the enum req_op and blk_opf_t types
fs/ocfs2: Use the enum req_op and blk_opf_t types
fs/ntfs3: Use enum req_op where appropriate
fs/nilfs2: Use the enum req_op and blk_opf_t types
fs/nfs: Use enum req_op where appropriate
fs/jbd2: Fix the documentation of the jbd2_write_superblock() callers
fs/iomap: Use the new blk_opf_t type
fs/hfsplus: Use the enum req_op and blk_opf_t types
fs/gfs2: Use the enum req_op and blk_opf_t types
fs/f2fs: Use the enum req_op and blk_opf_t types
...
Diffstat (limited to 'lib')
-rw-r--r-- | lib/iov_iter.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 0b64695ab632..507e732ef7cf 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1268,6 +1268,98 @@ void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count) } EXPORT_SYMBOL(iov_iter_discard); +static bool iov_iter_aligned_iovec(const struct iov_iter *i, unsigned addr_mask, + unsigned len_mask) +{ + size_t size = i->count; + size_t skip = i->iov_offset; + unsigned k; + + for (k = 0; k < i->nr_segs; k++, skip = 0) { + size_t len = i->iov[k].iov_len - skip; + + if (len > size) + len = size; + if (len & len_mask) + return false; + if ((unsigned long)(i->iov[k].iov_base + skip) & addr_mask) + return false; + + size -= len; + if (!size) + break; + } + return true; +} + +static bool iov_iter_aligned_bvec(const struct iov_iter *i, unsigned addr_mask, + unsigned len_mask) +{ + size_t size = i->count; + unsigned skip = i->iov_offset; + unsigned k; + + for (k = 0; k < i->nr_segs; k++, skip = 0) { + size_t len = i->bvec[k].bv_len - skip; + + if (len > size) + len = size; + if (len & len_mask) + return false; + if ((unsigned long)(i->bvec[k].bv_offset + skip) & addr_mask) + return false; + + size -= len; + if (!size) + break; + } + return true; +} + +/** + * iov_iter_is_aligned() - Check if the addresses and lengths of each segments + * are aligned to the parameters. + * + * @i: &struct iov_iter to restore + * @addr_mask: bit mask to check against the iov element's addresses + * @len_mask: bit mask to check against the iov element's lengths + * + * Return: false if any addresses or lengths intersect with the provided masks + */ +bool iov_iter_is_aligned(const struct iov_iter *i, unsigned addr_mask, + unsigned len_mask) +{ + if (likely(iter_is_iovec(i) || iov_iter_is_kvec(i))) + return iov_iter_aligned_iovec(i, addr_mask, len_mask); + + if (iov_iter_is_bvec(i)) + return iov_iter_aligned_bvec(i, addr_mask, len_mask); + + if (iov_iter_is_pipe(i)) { + unsigned int p_mask = i->pipe->ring_size - 1; + size_t size = i->count; + + if (size & len_mask) + return false; + if (size && allocated(&i->pipe->bufs[i->head & p_mask])) { + if (i->iov_offset & addr_mask) + return false; + } + + return true; + } + + if (iov_iter_is_xarray(i)) { + if (i->count & len_mask) + return false; + if ((i->xarray_start + i->iov_offset) & addr_mask) + return false; + } + + return true; +} +EXPORT_SYMBOL_GPL(iov_iter_is_aligned); + static unsigned long iov_iter_alignment_iovec(const struct iov_iter *i) { unsigned long res = 0; |