54ceac4515
The attached patch makes NFS share superblocks between mounts from the same
server and FSID over the same protocol.
It does this by creating each superblock with a false root and returning the
real root dentry in the vfsmount presented by get_sb(). The root dentry set
starts off as an anonymous dentry if we don't already have the dentry for its
inode, otherwise it simply returns the dentry we already have.
We may thus end up with several trees of dentries in the superblock, and if at
some later point one of anonymous tree roots is discovered by normal filesystem
activity to be located in another tree within the superblock, the anonymous
root is named and materialises attached to the second tree at the appropriate
point.
Why do it this way? Why not pass an extra argument to the mount() syscall to
indicate the subpath and then pathwalk from the server root to the desired
directory? You can't guarantee this will work for two reasons:
(1) The root and intervening nodes may not be accessible to the client.
With NFS2 and NFS3, for instance, mountd is called on the server to get
the filehandle for the tip of a path. mountd won't give us handles for
anything we don't have permission to access, and so we can't set up NFS
inodes for such nodes, and so can't easily set up dentries (we'd have to
have ghost inodes or something).
With this patch we don't actually create dentries until we get handles
from the server that we can use to set up their inodes, and we don't
actually bind them into the tree until we know for sure where they go.
(2) Inaccessible symbolic links.
If we're asked to mount two exports from the server, eg:
mount warthog:/warthog/aaa/xxx /mmm
mount warthog:/warthog/bbb/yyy /nnn
We may not be able to access anything nearer the root than xxx and yyy,
but we may find out later that /mmm/www/yyy, say, is actually the same
directory as the one mounted on /nnn. What we might then find out, for
example, is that /warthog/bbb was actually a symbolic link to
/warthog/aaa/xxx/www, but we can't actually determine that by talking to
the server until /warthog is made available by NFS.
This would lead to having constructed an errneous dentry tree which we
can't easily fix. We can end up with a dentry marked as a directory when
it should actually be a symlink, or we could end up with an apparently
hardlinked directory.
With this patch we need not make assumptions about the type of a dentry
for which we can't retrieve information, nor need we assume we know its
place in the grand scheme of things until we actually see that place.
This patch reduces the possibility of aliasing in the inode and page caches for
inodes that may be accessed by more than one NFS export. It also reduces the
number of superblocks required for NFS where there are many NFS exports being
used from a server (home directory server + autofs for example).
This in turn makes it simpler to do local caching of network filesystems, as it
can then be guaranteed that there won't be links from multiple inodes in
separate superblocks to the same cache file.
Obviously, cache aliasing between different levels of NFS protocol could still
be a problem, but at least that gives us another key to use when indexing the
cache.
This patch makes the following changes:
(1) The server record construction/destruction has been abstracted out into
its own set of functions to make things easier to get right. These have
been moved into fs/nfs/client.c.
All the code in fs/nfs/client.c has to do with the management of
connections to servers, and doesn't touch superblocks in any way; the
remaining code in fs/nfs/super.c has to do with VFS superblock management.
(2) The sequence of events undertaken by NFS mount is now reordered:
(a) A volume representation (struct nfs_server) is allocated.
(b) A server representation (struct nfs_client) is acquired. This may be
allocated or shared, and is keyed on server address, port and NFS
version.
(c) If allocated, the client representation is initialised. The state
member variable of nfs_client is used to prevent a race during
initialisation from two mounts.
(d) For NFS4 a simple pathwalk is performed, walking from FH to FH to find
the root filehandle for the mount (fs/nfs/getroot.c). For NFS2/3 we
are given the root FH in advance.
(e) The volume FSID is probed for on the root FH.
(f) The volume representation is initialised from the FSINFO record
retrieved on the root FH.
(g) sget() is called to acquire a superblock. This may be allocated or
shared, keyed on client pointer and FSID.
(h) If allocated, the superblock is initialised.
(i) If the superblock is shared, then the new nfs_server record is
discarded.
(j) The root dentry for this mount is looked up from the root FH.
(k) The root dentry for this mount is assigned to the vfsmount.
(3) nfs_readdir_lookup() creates dentries for each of the entries readdir()
returns; this function now attaches disconnected trees from alternate
roots that happen to be discovered attached to a directory being read (in
the same way nfs_lookup() is made to do for lookup ops).
The new d_materialise_unique() function is now used to do this, thus
permitting the whole thing to be done under one set of locks, and thus
avoiding any race between mount and lookup operations on the same
directory.
(4) The client management code uses a new debug facility: NFSDBG_CLIENT which
is set by echoing 1024 to /proc/net/sunrpc/nfs_debug.
(5) Clone mounts are now called xdev mounts.
(6) Use the dentry passed to the statfs() op as the handle for retrieving fs
statistics rather than the root dentry of the superblock (which is now a
dummy).
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
208 lines
5.6 KiB
C
208 lines
5.6 KiB
C
/*
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* NFS internal definitions
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*/
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#include <linux/mount.h>
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struct nfs_string;
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struct nfs_mount_data;
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struct nfs4_mount_data;
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/* Maximum number of readahead requests
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* FIXME: this should really be a sysctl so that users may tune it to suit
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* their needs. People that do NFS over a slow network, might for
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* instance want to reduce it to something closer to 1 for improved
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* interactive response.
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*/
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#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
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struct nfs_clone_mount {
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const struct super_block *sb;
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const struct dentry *dentry;
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struct nfs_fh *fh;
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struct nfs_fattr *fattr;
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char *hostname;
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char *mnt_path;
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struct sockaddr_in *addr;
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rpc_authflavor_t authflavor;
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};
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/* client.c */
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extern struct rpc_program nfs_program;
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extern void nfs_put_client(struct nfs_client *);
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extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
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extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *,
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struct nfs_fh *);
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extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *,
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const char *,
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const struct sockaddr_in *,
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const char *,
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const char *,
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rpc_authflavor_t,
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struct nfs_fh *);
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extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
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struct nfs_fh *);
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extern void nfs_free_server(struct nfs_server *server);
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extern struct nfs_server *nfs_clone_server(struct nfs_server *,
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struct nfs_fh *,
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struct nfs_fattr *);
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/* nfs4namespace.c */
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#ifdef CONFIG_NFS_V4
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extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
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#else
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static inline
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struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
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{
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return ERR_PTR(-ENOENT);
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}
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#endif
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/* callback_xdr.c */
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extern struct svc_version nfs4_callback_version1;
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/* pagelist.c */
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extern int __init nfs_init_nfspagecache(void);
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extern void nfs_destroy_nfspagecache(void);
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extern int __init nfs_init_readpagecache(void);
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extern void nfs_destroy_readpagecache(void);
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extern int __init nfs_init_writepagecache(void);
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extern void nfs_destroy_writepagecache(void);
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#ifdef CONFIG_NFS_DIRECTIO
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extern int __init nfs_init_directcache(void);
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extern void nfs_destroy_directcache(void);
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#else
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#define nfs_init_directcache() (0)
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#define nfs_destroy_directcache() do {} while(0)
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#endif
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/* nfs2xdr.c */
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extern int nfs_stat_to_errno(int);
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extern struct rpc_procinfo nfs_procedures[];
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extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
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/* nfs3xdr.c */
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extern struct rpc_procinfo nfs3_procedures[];
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extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);
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/* nfs4xdr.c */
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#ifdef CONFIG_NFS_V4
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extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
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#endif
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/* nfs4proc.c */
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#ifdef CONFIG_NFS_V4
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extern struct rpc_procinfo nfs4_procedures[];
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extern int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
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struct nfs4_fs_locations *fs_locations,
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struct page *page);
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#endif
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/* dir.c */
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extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
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/* inode.c */
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extern struct inode *nfs_alloc_inode(struct super_block *sb);
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extern void nfs_destroy_inode(struct inode *);
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extern int nfs_write_inode(struct inode *,int);
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extern void nfs_clear_inode(struct inode *);
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#ifdef CONFIG_NFS_V4
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extern void nfs4_clear_inode(struct inode *);
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#endif
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/* super.c */
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extern struct file_system_type nfs_xdev_fs_type;
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#ifdef CONFIG_NFS_V4
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extern struct file_system_type nfs4_xdev_fs_type;
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extern struct file_system_type nfs4_referral_fs_type;
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#endif
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extern struct rpc_stat nfs_rpcstat;
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extern int __init register_nfs_fs(void);
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extern void __exit unregister_nfs_fs(void);
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/* namespace.c */
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extern char *nfs_path(const char *base,
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const struct dentry *droot,
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const struct dentry *dentry,
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char *buffer, ssize_t buflen);
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/* getroot.c */
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extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
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#ifdef CONFIG_NFS_V4
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extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
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extern int nfs4_path_walk(struct nfs_server *server,
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struct nfs_fh *mntfh,
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const char *path);
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#endif
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/*
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* Determine the device name as a string
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*/
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static inline char *nfs_devname(const struct vfsmount *mnt_parent,
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const struct dentry *dentry,
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char *buffer, ssize_t buflen)
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{
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return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
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dentry, buffer, buflen);
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}
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/*
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* Determine the actual block size (and log2 thereof)
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*/
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static inline
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unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
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{
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/* make sure blocksize is a power of two */
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if ((bsize & (bsize - 1)) || nrbitsp) {
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unsigned char nrbits;
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for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
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;
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bsize = 1 << nrbits;
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if (nrbitsp)
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*nrbitsp = nrbits;
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}
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return bsize;
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}
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/*
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* Calculate the number of 512byte blocks used.
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*/
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static inline unsigned long nfs_calc_block_size(u64 tsize)
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{
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loff_t used = (tsize + 511) >> 9;
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return (used > ULONG_MAX) ? ULONG_MAX : used;
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}
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/*
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* Compute and set NFS server blocksize
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*/
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static inline
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unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
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{
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if (bsize < NFS_MIN_FILE_IO_SIZE)
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bsize = NFS_DEF_FILE_IO_SIZE;
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else if (bsize >= NFS_MAX_FILE_IO_SIZE)
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bsize = NFS_MAX_FILE_IO_SIZE;
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return nfs_block_bits(bsize, nrbitsp);
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}
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/*
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* Determine the maximum file size for a superblock
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*/
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static inline
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void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
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{
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sb->s_maxbytes = (loff_t)maxfilesize;
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if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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}
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