mirror of
https://github.com/torvalds/linux
synced 2024-09-21 11:38:48 +00:00
979df72e6f
A pinned inode may in theory end up filling memory with cached ACCESS calls. This patch ensures that the VM may shrink away the cache in these particular cases. The shrinker works by iterating through the list of inodes on the global nfs_access_lru_list, and removing the least recently used access cache entry until it is done (or until the entire cache is empty). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
190 lines
4.6 KiB
C
190 lines
4.6 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_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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/* namespace-nfs4.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 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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extern int nfs_stat_to_errno(int);
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extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
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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_referral_nfs4_fs_type;
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extern struct file_system_type clone_nfs_fs_type;
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#ifdef CONFIG_NFS_V4
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extern struct file_system_type clone_nfs4_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, const struct dentry *dentry,
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char *buffer, ssize_t buflen);
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/*
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* Determine the mount path as a string
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*/
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static inline char *
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nfs4_path(const struct dentry *dentry, char *buffer, ssize_t buflen)
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{
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#ifdef CONFIG_NFS_V4
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return nfs_path(NFS_SB(dentry->d_sb)->mnt_path, dentry, buffer, buflen);
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#else
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return NULL;
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#endif
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}
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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, 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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/*
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* Check if the string represents a "valid" IPv4 address
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*/
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static inline int valid_ipaddr4(const char *buf)
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{
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int rc, count, in[4];
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rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
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if (rc != 4)
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return -EINVAL;
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for (count = 0; count < 4; count++) {
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if (in[count] > 255)
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return -EINVAL;
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}
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return 0;
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}
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