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authorChristoph Hellwig <hch@lst.de>2023-06-01 17:58:56 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-06-10 02:25:52 +0300
commit3c435a0fe35c220bec442dffff04a64aacf952b0 (patch)
tree84a7fbf007f1eecdaa82e7d31c927678f2dae2ee /mm/filemap.c
parent182c25e9c157f37bd0ab5a82fe2417e2223df459 (diff)
downloadlinux-3c435a0fe35c220bec442dffff04a64aacf952b0.tar.xz
filemap: add a kiocb_write_and_wait helper
Factor out a helper that does filemap_write_and_wait_range for the range covered by a read kiocb, or returns -EAGAIN if the kiocb is marked as nowait and there would be pages to write. Link: https://lkml.kernel.org/r/20230601145904.1385409-5-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Darrick J. Wong <djwong@kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andreas Gruenbacher <agruenba@redhat.com> Cc: Anna Schumaker <anna@kernel.org> Cc: Chao Yu <chao@kernel.org> Cc: Christian Brauner <brauner@kernel.org> Cc: Ilya Dryomov <idryomov@gmail.com> Cc: Jaegeuk Kim <jaegeuk@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Miklos Szeredi <mszeredi@redhat.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Xiubo Li <xiubli@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c30
1 files changed, 18 insertions, 12 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 3a80a69fa9fa..5566e10ca1a7 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2735,6 +2735,21 @@ put_folios:
}
EXPORT_SYMBOL_GPL(filemap_read);
+int kiocb_write_and_wait(struct kiocb *iocb, size_t count)
+{
+ struct address_space *mapping = iocb->ki_filp->f_mapping;
+ loff_t pos = iocb->ki_pos;
+ loff_t end = pos + count - 1;
+
+ if (iocb->ki_flags & IOCB_NOWAIT) {
+ if (filemap_range_needs_writeback(mapping, pos, end))
+ return -EAGAIN;
+ return 0;
+ }
+
+ return filemap_write_and_wait_range(mapping, pos, end);
+}
+
/**
* generic_file_read_iter - generic filesystem read routine
* @iocb: kernel I/O control block
@@ -2770,18 +2785,9 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
- if (iocb->ki_flags & IOCB_NOWAIT) {
- if (filemap_range_needs_writeback(mapping, iocb->ki_pos,
- iocb->ki_pos + count - 1))
- return -EAGAIN;
- } else {
- retval = filemap_write_and_wait_range(mapping,
- iocb->ki_pos,
- iocb->ki_pos + count - 1);
- if (retval < 0)
- return retval;
- }
-
+ retval = kiocb_write_and_wait(iocb, count);
+ if (retval < 0)
+ return retval;
file_accessed(file);
retval = mapping->a_ops->direct_IO(iocb, iter);