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authorColy Li <coly.li@suse.de>2009-04-02 16:59:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 19:05:08 -0700
commitaccb40122040374e97fdf4bb81bdc9316b52c756 (patch)
treea3c1982d61036f361bc720d11a9345dd81f76f0c /fs/adfs
parent10c7db279218eda4b19d29ee17db8a815b18d564 (diff)
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fs/adfs: return f_fsid for statfs(2)
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@suse.de> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: "Sergey S. Kostyliov" <rathamahata@php4.ru> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Cc: Dave Kleikamp <shaggy@austin.ibm.com> Cc: Bob Copeland <me@bobcopeland.com> Cc: Anders Larsen <al@alarsen.net> Cc: Phillip Lougher <phillip@lougher.demon.co.uk> Cc: Christoph Hellwig <hch@infradead.org> Cc: Evgeniy Dushistov <dushistov@mail.ru> Cc: Jan Kara <jack@suse.cz> Cc: Andreas Dilger <adilger@sun.com> Cc: Jamie Lokier <jamie@shareable.org> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/adfs')
-rw-r--r--fs/adfs/super.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/fs/adfs/super.c b/fs/adfs/super.c
index 7f83a46f2b7..dd9becca424 100644
--- a/fs/adfs/super.c
+++ b/fs/adfs/super.c
@@ -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;
}