As far as I can see, currently the only way to sync a single file system
(and not _all_ mounted file systems) is via the BLKFLSBUF ioctl, which
will sync_filesystem() and then invalidate_bdev(). If you _just_ want to
sync, though, the invalidate_bdev() is unnecessary and potentially
counter-productive.
Would it be reasonable to add a simple call like so? Then you could
fd = open("/path/for/some/mount", O_RDONLY);
ioctl(fd, FS_IOC_SYNCFS);
close(fd);
or something along those lines.
sage
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 2d140a7..0bc9f7a 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -593,6 +593,9 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
case FS_IOC_FIEMAP:
return ioctl_fiemap(filp, arg);
+ case FS_IOC_SYNCFS:
+ return sync_filesystem(filp->f_dentry->d_sb);
+
case FIGETBSZ:
{
struct inode *inode = filp->f_path.dentry->d_inode;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 471e1ff..4a84d78 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -321,6 +321,7 @@ struct inodes_stat_t {
#define FS_IOC_GETVERSION _IOR('v', 1, long)
#define FS_IOC_SETVERSION _IOW('v', 2, long)
#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
+#define FS_IOC_SYNCFS _IO('S', 12)
#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
#define FS_IOC32_GETVERSION _IOR('v', 1, int)
--
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