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nfs: get rid of mount_info ->fill_super()

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The only possible values are nfs_fill_super and nfs_clone_super.  The
latter is used only when crossing into a submount and it is almost
identical to the former; the only differences are
	* ->s_time_gran unconditionally set to 1 (even for v2 mounts).
Regression dating back to 2012, actually.
	* ->s_blocksize/->s_blocksize_bits set to that of parent.

Rather than messing with the method, stash ->s_blocksize_bits in
mount_info in submount case and after the (now unconditional)
call of nfs_fill_super() override ->s_blocksize/->s_blocksize_bits
if that has been set.

Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Al Viro 2019-12-10 07:31:01 -05:00 committed by Anna Schumaker
parent 0c38f2131d
commit ab88dca311
4 changed files with 18 additions and 64 deletions
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4
fs/nfs/internal.h
View File

@ -136,7 +136,7 @@ struct nfs_mount_request {
};
struct nfs_mount_info {
void (*fill_super)(struct super_block *, struct nfs_mount_info *);
unsigned int inherited_bsize;
int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
struct nfs_parsed_mount_data *parsed;
struct nfs_clone_mount *cloned;
@ -395,8 +395,6 @@ int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_
int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
void nfs_kill_super(struct super_block *);
void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
extern struct rpc_stat nfs_rpcstat;

2
fs/nfs/namespace.c
View File

@ -232,7 +232,7 @@ struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh,
.authflavor = authflavor,
};
struct nfs_mount_info mount_info = {
.fill_super = nfs_clone_super,
.inherited_bsize = sb->s_blocksize_bits,
.set_security = nfs_clone_sb_security,
.cloned = &mountdata,
.mntfh = fh,

1
fs/nfs/nfs4super.c
View File

@ -224,7 +224,6 @@ static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
{
struct nfs_clone_mount *data = raw_data;
struct nfs_mount_info mount_info = {
.fill_super = nfs_fill_super,
.set_security = nfs_clone_sb_security,
.cloned = data,
.nfs_mod = &nfs_v4,

75
fs/nfs/super.c
View File

@ -2339,29 +2339,9 @@ out:
EXPORT_SYMBOL_GPL(nfs_remount);
/*
* Initialise the common bits of the superblock
* Finish setting up an NFS superblock
*/
static void nfs_initialise_sb(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
sb->s_magic = NFS_SUPER_MAGIC;
/* We probably want something more informative here */
snprintf(sb->s_id, sizeof(sb->s_id),
"%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
if (sb->s_blocksize == 0)
sb->s_blocksize = nfs_block_bits(server->wsize,
&sb->s_blocksize_bits);
nfs_super_set_maxbytes(sb, server->maxfilesize);
}
/*
* Finish setting up an NFS2/3 superblock
*/
void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
static void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
{
struct nfs_parsed_mount_data *data = mount_info->parsed;
struct nfs_server *server = NFS_SB(sb);
@ -2391,44 +2371,17 @@ void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
sb->s_time_max = S64_MAX;
}
nfs_initialise_sb(sb);
}
EXPORT_SYMBOL_GPL(nfs_fill_super);
sb->s_magic = NFS_SUPER_MAGIC;
/*
* Finish setting up a cloned NFS2/3/4 superblock
*/
void nfs_clone_super(struct super_block *sb,
struct nfs_mount_info *mount_info)
{
const struct super_block *old_sb = mount_info->cloned->sb;
struct nfs_server *server = NFS_SB(sb);
/* We probably want something more informative here */
snprintf(sb->s_id, sizeof(sb->s_id),
"%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
sb->s_blocksize_bits = old_sb->s_blocksize_bits;
sb->s_blocksize = old_sb->s_blocksize;
sb->s_maxbytes = old_sb->s_maxbytes;
sb->s_xattr = old_sb->s_xattr;
sb->s_op = old_sb->s_op;
sb->s_export_op = old_sb->s_export_op;
if (sb->s_blocksize == 0)
sb->s_blocksize = nfs_block_bits(server->wsize,
&sb->s_blocksize_bits);
if (server->nfs_client->rpc_ops->version != 2) {
/* The VFS shouldn't apply the umask to mode bits. We will do
* so ourselves when necessary.
*/
sb->s_flags |= SB_POSIXACL;
sb->s_time_gran = 1;
} else
sb->s_time_gran = 1000;
if (server->nfs_client->rpc_ops->version != 4) {
sb->s_time_min = 0;
sb->s_time_max = U32_MAX;
} else {
sb->s_time_min = S64_MIN;
sb->s_time_max = S64_MAX;
}
nfs_initialise_sb(sb);
nfs_super_set_maxbytes(sb, server->maxfilesize);
}
static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
@ -2701,8 +2654,13 @@ static struct dentry *nfs_fs_mount_common(int flags, const char *dev_name,
}
if (!s->s_root) {
unsigned bsize = mount_info->inherited_bsize;
/* initial superblock/root creation */
mount_info->fill_super(s, mount_info);
nfs_fill_super(s, mount_info);
if (bsize) {
s->s_blocksize_bits = bsize;
s->s_blocksize = 1U << bsize;
}
nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
if (!(server->flags & NFS_MOUNT_UNSHARED))
s->s_iflags |= SB_I_MULTIROOT;
@ -2737,7 +2695,6 @@ struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data)
{
struct nfs_mount_info mount_info = {
.fill_super = nfs_fill_super,
.set_security = nfs_set_sb_security,
};
struct dentry *mntroot = ERR_PTR(-ENOMEM);