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authorSage Weil <sage@newdream.net>2010-04-16 20:53:43 +0400
committerSage Weil <sage@newdream.net>2010-08-02 07:11:39 +0400
commit8c6e9229fc1989cf263a6fcd4ff406d7f473f966 (patch)
tree6402204aae50b0590df39289ed1e533472ee6ca1 /fs/ceph/ioctl.c
parent84d9509234c46481aded977193fcf23f892d715f (diff)
downloadlinux-8c6e9229fc1989cf263a6fcd4ff406d7f473f966.tar.xz
ceph: add LAZYIO ioctl to mark a file description for lazy consistency
Allow an application to mark a file descriptor for lazy file consistency semantics, allowing buffered reads and writes when multiple clients are accessing the same file. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/ioctl.c')
-rw-r--r--fs/ceph/ioctl.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index d085f07756b4..76e307d2aba1 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -143,6 +143,27 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
return 0;
}
+static long ceph_ioctl_lazyio(struct file *file)
+{
+ struct ceph_file_info *fi = file->private_data;
+ struct inode *inode = file->f_dentry->d_inode;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+
+ if ((fi->fmode & CEPH_FILE_MODE_LAZY) == 0) {
+ spin_lock(&inode->i_lock);
+ ci->i_nr_by_mode[fi->fmode]--;
+ fi->fmode |= CEPH_FILE_MODE_LAZY;
+ ci->i_nr_by_mode[fi->fmode]++;
+ spin_unlock(&inode->i_lock);
+ dout("ioctl_layzio: file %p marked lazy\n", file);
+
+ ceph_check_caps(ci, 0, NULL);
+ } else {
+ dout("ioctl_layzio: file %p already lazy\n", file);
+ }
+ return 0;
+}
+
long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
dout("ioctl file %p cmd %u arg %lu\n", file, cmd, arg);
@@ -155,6 +176,9 @@ long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case CEPH_IOC_GET_DATALOC:
return ceph_ioctl_get_dataloc(file, (void __user *)arg);
+
+ case CEPH_IOC_LAZYIO:
+ return ceph_ioctl_lazyio(file);
}
return -ENOTTY;
}