The patch titled
fs/adfs: return f_fsid for statfs(2)
has been added to the -mm tree. Its filename is
fs-adfs-return-f_fsid-for-statfs2.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: fs/adfs: return f_fsid for statfs(2)
From: Coly Li <coly.li@xxxxxxx>
Currently many file systems in Linux kernel do not return f_fsid in statfs
info, the value is set as 0 in vfs layer. Anyway, in some conditions,
f_fsid from statfs(2) is useful, especially being used as (f_fsid, ino)
pair to uniquely identify a file.
Basic idea of the patches is generating a unique fs ID by
huge_encode_dev(sb->s_bdev->bd_dev) during file system mounting life time
(no endian consistent issue). sb is a point of struct super_block of
current mounted file system being accessed by statfs(2).
This patch:
Make adfs return f_fsid info for statfs(2), and do a little variable
renaming in adfs_statfs().
Signed-off-by: Coly Li <coly.li@xxxxxxx>
Cc: Roman Zippel <zippel@xxxxxxxxxxxxxx>
Cc: "Sergey S. Kostyliov" <rathamahata@xxxxxxx>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Cc: Mikulas Patocka <mikulas@xxxxxxxxxxxxxxxxxxxxxxxx>
Cc: Dave Kleikamp <shaggy@xxxxxxxxxxxxxx>
Cc: Bob Copeland <me@xxxxxxxxxxxxxxx>
Cc: Anders Larsen <al@xxxxxxxxxxx>
Cc: Phillip Lougher <phillip@xxxxxxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Evgeniy Dushistov <dushistov@xxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Andreas Dilger <adilger@xxxxxxx>
Cc: Jamie Lokier <jamie@xxxxxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/adfs/super.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff -puN fs/adfs/super.c~fs-adfs-return-f_fsid-for-statfs2 fs/adfs/super.c
--- a/fs/adfs/super.c~fs-adfs-return-f_fsid-for-statfs2
+++ a/fs/adfs/super.c
@@ -219,16 +219,20 @@ static int adfs_remount(struct super_blo
static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
- struct adfs_sb_info *asb = ADFS_SB(dentry->d_sb);
+ struct super_block *sb = dentry->d_sb;
+ struct adfs_sb_info *sbi = ADFS_SB(sb);
+ u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
buf->f_type = ADFS_SUPER_MAGIC;
- buf->f_namelen = asb->s_namelen;
- buf->f_bsize = dentry->d_sb->s_blocksize;
- buf->f_blocks = asb->s_size;
- buf->f_files = asb->s_ids_per_zone * asb->s_map_size;
+ buf->f_namelen = sbi->s_namelen;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = sbi->s_size;
+ buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size;
buf->f_bavail =
- buf->f_bfree = adfs_map_free(dentry->d_sb);
+ buf->f_bfree = adfs_map_free(sb);
buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks;
+ buf->f_fsid.val[0] = (u32)id;
+ buf->f_fsid.val[1] = (u32)(id >> 32);
return 0;
}
_
Patches currently in -mm which might be from coly.li@xxxxxxx are
fs-adfs-return-f_fsid-for-statfs2.patch
fs-affs-return-f_fsid-for-statfs2.patch
fs-befs-return-f_fsid-for-statfs2.patch
fs-cramfs-return-f_fsid-for-statfs2.patch
fs-efs-return-f_fsid-for-statfs2.patch
fs-fat-return-f_fsid-for-statfs2.patch
fs-hfs-return-f_fsid-for-statfs2.patch
fs-hfsplus-return-f_fsid-for-statfs2.patch
fs-hpfs-return-f_fsid-for-statfs2.patch
fs-isofs-return-f_fsid-for-statfs2.patch
fs-jfs-return-f_fsid-for-statfs2.patch
fs-minix-return-f_fsid-for-statfs2.patch
fs-omfs-return-f_fsid-for-statfs2.patch
fs-qnx4-return-f_fsid-for-statfs2.patch
fs-reiserfs-return-f_fsid-for-statfs2.patch
fs-romfs-return-f_fsid-for-statfs2.patch
fs-squashfs-return-f_fsid-for-statfs2.patch
fs-sysv-return-f_fsid-for-statfs2.patch
fs-udf-return-f_fsid-for-statfs2.patch
fs-ufs-return-f_fsid-for-statfs2.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
