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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | /* * Symlink inode operations for Coda filesystem * Original version: (C) 1996 P. Braam and M. Callahan * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University * * Carnegie Mellon encourages users to contribute improvements to * the Coda project. Contact Peter Braam (coda@cs.cmu.edu). */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/fs.h> #include <linux/stat.h> #include <linux/errno.h> #include <linux/locks.h> #include <asm/segment.h> #include <asm/uaccess.h> #include <linux/string.h> #include <linux/coda.h> #include <linux/coda_linux.h> #include <linux/coda_psdev.h> #include <linux/coda_fs_i.h> #include <linux/coda_cache.h> #include <linux/coda_proc.h> static int coda_readlink(struct dentry *de, char *buffer, int length); static struct dentry *coda_follow_link(struct dentry *, struct dentry *, unsigned int); struct inode_operations coda_symlink_inode_operations = { NULL, /* no file-operations */ NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ coda_readlink, /* readlink */ coda_follow_link, /* follow_link */ NULL, /* bmap */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* flushpage */ NULL, /* truncate */ NULL, /* permission */ NULL, /* smap */ NULL /* revalidate */ }; static int coda_readlink(struct dentry *de, char *buffer, int length) { struct inode *inode = de->d_inode; int len; int error; char *buf; struct coda_inode_info *cp; ENTRY; cp = ITOC(inode); coda_vfs_stat.readlink++; /* the maximum length we receive is len */ if ( length > CODA_MAXPATHLEN ) len = CODA_MAXPATHLEN; else len = length; CODA_ALLOC(buf, char *, len); if ( !buf ) return -ENOMEM; error = venus_readlink(inode->i_sb, &(cp->c_fid), buf, &len); CDEBUG(D_INODE, "result %s\n", buf); if (! error) { copy_to_user(buffer, buf, len); put_user('\0', buffer + len); error = len; } if ( buf ) CODA_FREE(buf, len); return error; } static struct dentry *coda_follow_link(struct dentry *de, struct dentry *base, unsigned int follow) { struct inode *inode = de->d_inode; int error; struct coda_inode_info *cnp; unsigned int len; char mem[CODA_MAXPATHLEN]; char *path; ENTRY; CDEBUG(D_INODE, "(%x/%ld)\n", inode->i_dev, inode->i_ino); cnp = ITOC(inode); coda_vfs_stat.follow_link++; len = CODA_MAXPATHLEN; error = venus_readlink(inode->i_sb, &(cnp->c_fid), mem, &len); if (error) { dput(base); return ERR_PTR(error); } len = strlen(mem); path = kmalloc(len + 1, GFP_KERNEL); if (!path) { dput(base); return ERR_PTR(-ENOMEM); } memcpy(path, mem, len); path[len] = 0; base = lookup_dentry(path, base, follow); kfree(path); return base; } |