Messages in this thread Patch in this message | | | Subject | [RFC][PATCH 1/4] use helper to set mnt_sb | From | Dave Hansen <> | Date | Thu, 10 Jan 2008 11:06:58 -0800 |
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We need to make sure that all mounts get into the sb list. So, require that new setters of mnt->mnt_sb use simple_set_mnt() instead of doing it themselves.
NFS does the same thing a few times in a row, so give it a nice little helper.
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linux-2.6.git-dave/fs/namespace.c | 3 +-- linux-2.6.git-dave/fs/nfs/super.c | 31 ++++++++++++++++--------------- 2 files changed, 17 insertions(+), 17 deletions(-)
diff -puN fs/namespace.c~make-mnt_sb-off-limits fs/namespace.c --- linux-2.6.git/fs/namespace.c~make-mnt_sb-off-limits 2008-01-10 10:36:37.000000000 -0800 +++ linux-2.6.git-dave/fs/namespace.c 2008-01-10 10:36:37.000000000 -0800 @@ -486,8 +486,7 @@ static struct vfsmount *clone_mnt(struct if (mnt) { mnt->mnt_flags = old->mnt_flags; atomic_inc(&sb->s_active); - mnt->mnt_sb = sb; - mnt->mnt_root = dget(root); + simple_set_mnt(mnt, sb); mnt->mnt_mountpoint = mnt->mnt_root; mnt->mnt_parent = mnt; diff -puN fs/nfs/super.c~make-mnt_sb-off-limits fs/nfs/super.c --- linux-2.6.git/fs/nfs/super.c~make-mnt_sb-off-limits 2008-01-10 10:36:37.000000000 -0800 +++ linux-2.6.git-dave/fs/nfs/super.c 2008-01-10 10:36:37.000000000 -0800 @@ -1364,6 +1364,17 @@ static int nfs_compare_super(struct supe return nfs_compare_mount_options(sb, server, mntflags); } +static void nfs_set_mnt(struct vfsmount *mnt, struct super_block *s) +{ + s->s_flags |= MS_ACTIVE; + simple_set_mnt(mnt, s); + /* + * simple_set_mnt() does a dput, which we already did + * in nfs_get_root(). + */ + dput(s->s_root); +} + static int nfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt) { @@ -1417,9 +1428,7 @@ static int nfs_get_sb(struct file_system goto error_splat_super; } - s->s_flags |= MS_ACTIVE; - mnt->mnt_sb = s; - mnt->mnt_root = mntroot; + nfs_set_mnt(mnt, s); error = 0; out: @@ -1505,9 +1514,7 @@ static int nfs_xdev_get_sb(struct file_s goto error_splat_super; } - s->s_flags |= MS_ACTIVE; - mnt->mnt_sb = s; - mnt->mnt_root = mntroot; + nfs_set_mnt(mnt, s); dprintk("<-- nfs_xdev_get_sb() = 0\n"); return 0; @@ -1766,9 +1773,7 @@ static int nfs4_get_sb(struct file_syste goto error_splat_super; } - s->s_flags |= MS_ACTIVE; - mnt->mnt_sb = s; - mnt->mnt_root = mntroot; + nfs_set_mnt(mnt, s); error = 0; out: @@ -1851,9 +1856,7 @@ static int nfs4_xdev_get_sb(struct file_ goto error_splat_super; } - s->s_flags |= MS_ACTIVE; - mnt->mnt_sb = s; - mnt->mnt_root = mntroot; + nfs_set_mnt(mnt, s); dprintk("<-- nfs4_xdev_get_sb() = 0\n"); return 0; @@ -1925,9 +1928,7 @@ static int nfs4_referral_get_sb(struct f goto error_splat_super; } - s->s_flags |= MS_ACTIVE; - mnt->mnt_sb = s; - mnt->mnt_root = mntroot; + nfs_set_mnt(mnt, s); dprintk("<-- nfs4_referral_get_sb() = 0\n"); return 0; _
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