From mboxrd@z Thu Jan 1 00:00:00 1970 From: Coly Li Subject: [PATCH] fs/reiserfs: return f_fsid for statfs(2), v3 Date: Fri, 27 Mar 2009 16:46:37 +0800 Message-ID: <49CC926D.7030101@suse.de> Reply-To: coly.li@suse.de Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: reiserfs-devel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: LKML Cc: Randy Dunlap , Andrew Morton , reiserfs-devel@vger.kernel.org This patch makes reiserfs3 return f_fsid info for statfs(2). By Andreas' suggestion, this patch populates a persistent f_fsid between boots/mounts with help of on-disk uuid record. Randy Dunlap reported a compiling error from v2 patch like: fs/built-in.o: In function `reiserfs_statfs': super.c:(.text+0x7332b): undefined reference to `crc32_le' super.c:(.text+0x7333f): undefined reference to `crc32_le' Also he provided helpful solution to fix this error. The modification of v3 patch is based on Randy's suggestion, add 'select CRC32' in fs/reiserfs/Kconfig. Signed-off-by: Coly Li Cc: Randy Dunlap Cc: Andrew Morton Cc: reiserfs-devel@vger.kernel.org --- fs/reiserfs/Kconfig | 1 + fs/reiserfs/super.c | 5 +++++ 2 files changed, 6 insertions(+), 0 deletions(-) diff --git a/fs/reiserfs/Kconfig b/fs/reiserfs/Kconfig index 949b8c6..513f431 100644 --- a/fs/reiserfs/Kconfig +++ b/fs/reiserfs/Kconfig @@ -1,5 +1,6 @@ config REISERFS_FS tristate "Reiserfs support" + select CRC32 help Stores not just filenames but the files themselves in a balanced tree. Uses journalling. diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index f3c820b..cb8e7ee 100644 --- a/fs/reiserfs/super.c +++ b/fs/reiserfs/super.c @@ -27,6 +27,7 @@ #include #include #include +#include struct file_system_type reiserfs_fs_type; @@ -1892,6 +1893,10 @@ static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf) buf->f_bsize = dentry->d_sb->s_blocksize; /* changed to accommodate gcc folks. */ buf->f_type = REISERFS_SUPER_MAGIC; + buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2); + buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2, + sizeof(rs->s_uuid)/2); + return 0; } -- Coly Li SuSE Labs