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ceph: add F_SYNC file flag to force sync (non-O_DIRECT) io

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This allows us to force IO through the sync path which you normally only
get when multiple clients are reading/writing to the same file or by
mounting with -o sync.  Among other things, this lets test programs verify
correctness with a single mount.

Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2011-07-26 11:26:07 -07:00
parent 252c6728de
commit 4918b6d140
4 changed files with 18 additions and 2 deletions
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6
fs/ceph/file.c
View file

@ -643,7 +643,8 @@ static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_filp->f_flags & O_DIRECT) ||
(inode->i_sb->s_flags & MS_SYNCHRONOUS))
(inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
(fi->flags & CEPH_F_SYNC))
/* hmm, this isn't really async... */
ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
else
@ -720,7 +721,8 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_filp->f_flags & O_DIRECT) ||
(inode->i_sb->s_flags & MS_SYNCHRONOUS)) {
(inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
(fi->flags & CEPH_F_SYNC)) {
ret = ceph_sync_write(file, iov->iov_base, iov->iov_len,
&iocb->ki_pos);
} else {

11
fs/ceph/ioctl.c
View file

@ -231,6 +231,14 @@ static long ceph_ioctl_lazyio(struct file *file)
return 0;
}
static long ceph_ioctl_syncio(struct file *file)
{
struct ceph_file_info *fi = file->private_data;
fi->flags |= CEPH_F_SYNC;
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);
@ -249,6 +257,9 @@ long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case CEPH_IOC_LAZYIO:
return ceph_ioctl_lazyio(file);
case CEPH_IOC_SYNCIO:
return ceph_ioctl_syncio(file);
}
return -ENOTTY;

1
fs/ceph/ioctl.h
View file

@ -40,5 +40,6 @@ struct ceph_ioctl_dataloc {
struct ceph_ioctl_dataloc)
#define CEPH_IOC_LAZYIO _IO(CEPH_IOCTL_MAGIC, 4)
#define CEPH_IOC_SYNCIO _IO(CEPH_IOCTL_MAGIC, 5)
#endif

2
fs/ceph/super.h
View file

@ -543,6 +543,8 @@ extern void ceph_reservation_status(struct ceph_fs_client *client,
/*
* we keep buffered readdir results attached to file->private_data
*/
#define CEPH_F_SYNC 1
struct ceph_file_info {
short fmode; /* initialized on open */
short flags; /* CEPH_F_* */