FS_IOC_SYNCFS
in [Kernel]
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From: Jan Kara on 23 Jul 2010 12:30 On Tue 20-07-10 16:48:26, Sage Weil wrote: > 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. Looks reasonable to me... Honza > 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) > -- > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in > the body of a message to majordomo(a)vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Jan Kara <jack(a)suse.cz> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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