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Date: Mon, 15 Sep 2014 16:22:12 -0400
From: Christoph Hellwig <milosz@...in.com>
To: linux-kernel@...r.kernel.org
Cc: Christoph Hellwig <hch@...radead.org>,
linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
Mel Gorman <mgorman@...e.de>,
Volker Lendecke <Volker.Lendecke@...net.de>,
Tejun Heo <tj@...nel.org>, Jeff Moyer <jmoyer@...hat.com>
Subject: [PATCH 7/7] check for O_NONBLOCK in all read_iter instances
Acked-by: Milosz Tanski <milosz@...in.com>
---
fs/ceph/file.c | 2 ++
fs/cifs/file.c | 6 ++++++
fs/nfs/file.c | 5 ++++-
fs/ocfs2/file.c | 6 ++++++
fs/pipe.c | 3 ++-
fs/read_write.c | 17 +++++++++++------
fs/xfs/xfs_file.c | 4 ++++
mm/shmem.c | 4 ++++
8 files changed, 39 insertions(+), 8 deletions(-)
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 4776257..b62e3a5 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -808,6 +808,8 @@ again:
if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_filp->f_flags & O_DIRECT) ||
(fi->flags & CEPH_F_SYNC)) {
+ if (flags & O_NONBLOCK)
+ return -EAGAIN;
dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 58aecd7..cda6b9e 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3005,6 +3005,9 @@ ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to, int flags)
struct cifs_readdata *rdata, *tmp;
struct list_head rdata_list;
+ if (flags & O_NONBLOCK)
+ return -EAGAIN;
+
len = iov_iter_count(to);
if (!len)
return 0;
@@ -3123,6 +3126,9 @@ cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to, int flags)
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
return generic_file_read_iter(iocb, to, flags);
+ if (flags & O_NONBLOCK)
+ return -EAGAIN;
+
/*
* We need to hold the sem to be sure nobody modifies lock list
* with a brlock that prevents reading.
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 4072f3a..116bed2 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -170,8 +170,11 @@ nfs_file_read(struct kiocb *iocb, struct iov_iter *to, int flags)
struct inode *inode = file_inode(iocb->ki_filp);
ssize_t result;
- if (iocb->ki_filp->f_flags & O_DIRECT)
+ if (iocb->ki_filp->f_flags & O_DIRECT) {
+ if (flags & O_NONBLOCK)
+ return -EAGAIN;
return nfs_file_direct_read(iocb, to, iocb->ki_pos, true);
+ }
dprintk("NFS: read(%pD2, %zu@%lu)\n",
iocb->ki_filp,
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 418c8a3..a8f7def 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2474,6 +2474,12 @@ static ssize_t ocfs2_file_read_iter(struct kiocb *iocb,
filp->f_path.dentry->d_name.name,
to->nr_segs); /* GRRRRR */
+ /*
+ * No non-blocking reads for ocfs2 for now. Might be doable with
+ * non-blocking cluster lock helpers.
+ */
+ if (flags & O_NONBLOCK)
+ return -EAGAIN;
if (!inode) {
ret = -EINVAL;
diff --git a/fs/pipe.c b/fs/pipe.c
index d2510ab..74d6749 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -302,7 +302,8 @@ pipe_read(struct kiocb *iocb, struct iov_iter *to, int flags)
*/
if (ret)
break;
- if (filp->f_flags & O_NONBLOCK) {
+ if ((filp->f_flags & O_NONBLOCK) ||
+ (flags & O_NONBLOCK)) {
ret = -EAGAIN;
break;
}
diff --git a/fs/read_write.c b/fs/read_write.c
index 233ea98..4a5f82c 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -832,14 +832,19 @@ static ssize_t do_readv_writev(int type, struct file *file,
file_start_write(file);
}
- if (iter_fn)
+ if (iter_fn) {
ret = do_iter_readv_writev(file, type, iov, nr_segs, tot_len,
pos, iter_fn, flags);
- else if (fnv)
- ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
- pos, fnv);
- else
- ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
+ } else {
+ if (type == READ && (flags & O_NONBLOCK))
+ return -EAGAIN;
+
+ if (fnv)
+ ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
+ pos, fnv);
+ else
+ ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
+ }
if (type != READ)
file_end_write(file);
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 68847008..0252a31 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -247,6 +247,10 @@ xfs_file_read_iter(
XFS_STATS_INC(xs_read_calls);
+ /* XXX: need a non-blocking iolock helper, shouldn't be too hard */
+ if (flags & O_NONBLOCK)
+ return -EAGAIN;
+
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= XFS_IO_ISDIRECT;
if (file->f_mode & FMODE_NOCMTIME)
diff --git a/mm/shmem.c b/mm/shmem.c
index 24c73bce..f5ad85f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1531,6 +1531,10 @@ static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to, int
ssize_t retval = 0;
loff_t *ppos = &iocb->ki_pos;
+ /* XXX: should be easily supportable */
+ if (flags & O_NONBLOCK)
+ return -EAGAIN;
+
/*
* Might this read be for a stacking filesystem? Then when reading
* holes of a sparse file, we actually need to allocate those pages,
--
1.7.9.5
--
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