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fs/adfs: return f_fsid for statfs(2)

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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 <[email protected]>
Cc: Roman Zippel <[email protected]>
Cc: "Sergey S. Kostyliov" <[email protected]>
Cc: OGAWA Hirofumi <[email protected]>
Cc: Mikulas Patocka <[email protected]>
Cc: Dave Kleikamp <[email protected]>
Cc: Bob Copeland <[email protected]>
Cc: Anders Larsen <[email protected]>
Cc: Phillip Lougher <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Evgeniy Dushistov <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: Jamie Lokier <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Coly Li 2009-04-02 16:59:27 -07:00 • committed by Linus Torvalds
commit accb401220
1 changed files with 10 additions and 6 deletions
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16
fs/adfs/super.c
View file

@ -219,16 +219,20 @@ static int adfs_remount(struct super_block *sb, int *flags, char *data)
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;
}