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author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-05-11 18:58:47 (GMT) |
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committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-06-10 14:41:11 (GMT) |
commit | 003ff182fddde09ddfb8d079bbdb02f9d2122082 (patch) | |
tree | d949fa673353767d8854355987e49d82821935f6 /fs/nilfs2/dat.h | |
parent | 258ef67e246fd548e7ad91c23004ad157c03cce5 (diff) | |
download | linux-fsl-qoriq-003ff182fddde09ddfb8d079bbdb02f9d2122082.tar.xz |
nilfs2: allow future expansion of metadata read out via get info ioctl
Nilfs has some ioctl commands to read out metadata from meta data
files:
- NILFS_IOCTL_GET_CPINFO for checkpoint file,
- NILFS_IOCTL_GET_SUINFO for segment usage file, and
- NILFS_IOCTL_GET_VINFO for Disk Address Transalation (DAT) file,
respectively.
Every routine on these metadata files is implemented so that it allows
future expansion of on-disk format. But, the above ioctl commands do
not support expansion even though nilfs_argv structure can handle
arbitrary size for data exchanged via ioctl.
This allows future expansion of the following structures which give
basic format of the "get information" ioctls:
- struct nilfs_cpinfo
- struct nilfs_suinfo
- struct nilfs_vinfo
So, this introduces forward compatility of such ioctl commands.
In this patch, a sanity check in nilfs_ioctl_get_info() function is
changed to accept larger data structure [1], and metadata read
routines are rewritten so that they become compatible for larger
structures; the routines will just ignore the remaining fields which
the current version of nilfs doesn't know.
[1] The ioctl function already has another upper limit (PAGE_SIZE
against a structure, which appears in nilfs_ioctl_wrap_copy
function), and this will not cause security problem.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/dat.h')
-rw-r--r-- | fs/nilfs2/dat.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nilfs2/dat.h b/fs/nilfs2/dat.h index d956065..d328b81 100644 --- a/fs/nilfs2/dat.h +++ b/fs/nilfs2/dat.h @@ -47,6 +47,6 @@ void nilfs_dat_abort_end(struct inode *, struct nilfs_palloc_req *); int nilfs_dat_mark_dirty(struct inode *, __u64); int nilfs_dat_freev(struct inode *, __u64 *, size_t); int nilfs_dat_move(struct inode *, __u64, sector_t); -ssize_t nilfs_dat_get_vinfo(struct inode *, struct nilfs_vinfo *, size_t); +ssize_t nilfs_dat_get_vinfo(struct inode *, void *, unsigned, size_t); #endif /* _NILFS_DAT_H */ |