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| author | David Howells <dhowells@redhat.com> | 2022-10-27 16:19:44 +0100 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2023-02-20 17:25:43 -0600 |
| commit | 0185846975339a5c348373aa450a977f5242366b (patch) | |
| tree | 1999ae8a5becdd01523a96e641dea1f12e6b3f82 /include/linux/netfs.h | |
| parent | 85dd2c8ff368b1446be9febde84afe1d7aec4261 (diff) | |
| download | linux-0185846975339a5c348373aa450a977f5242366b.tar.gz linux-0185846975339a5c348373aa450a977f5242366b.tar.bz2 linux-0185846975339a5c348373aa450a977f5242366b.zip | |
netfs: Add a function to extract an iterator into a scatterlist
Provide a function for filling in a scatterlist from the list of pages
contained in an iterator.
If the iterator is UBUF- or IOBUF-type, the pages have a pin taken on them
(as FOLL_PIN).
If the iterator is BVEC-, KVEC- or XARRAY-type, no pin is taken on the
pages and it is left to the caller to manage their lifetime. It cannot be
assumed that a ref can be validly taken, particularly in the case of a KVEC
iterator.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: Steve French <sfrench@samba.org>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: linux-cachefs@redhat.com
cc: linux-cifs@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'include/linux/netfs.h')
| -rw-r--r-- | include/linux/netfs.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/netfs.h b/include/linux/netfs.h index b11a84f6c32b..a1f3522daa69 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -300,6 +300,10 @@ void netfs_stats_show(struct seq_file *); ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len, struct iov_iter *new, iov_iter_extraction_t extraction_flags); +struct sg_table; +ssize_t netfs_extract_iter_to_sg(struct iov_iter *iter, size_t len, + struct sg_table *sgtable, unsigned int sg_max, + iov_iter_extraction_t extraction_flags); /** * netfs_inode - Get the netfs inode context from the inode |