b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100 1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 2) /* cnode related routines for the coda kernel code
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 3) (C) 1996 Peter Braam
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) #include <linux/types.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) #include <linux/string.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) #include <linux/time.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) #include <linux/coda.h>
21fc61c73c390 (Al Viro 2015-11-17 01:07:57 -0500 11) #include <linux/pagemap.h>
8fc8b9df83138 (David Howells 2019-07-16 16:28:47 -0700 12) #include "coda_psdev.h"
31a203df9c109 (Al Viro 2011-01-12 16:36:09 -0500 13) #include "coda_linux.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15) static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 17) return memcmp(fid1, fid2, sizeof(*fid1)) == 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 19)
754661f143e70 (Arjan van de Ven 2007-02-12 00:55:38 -0800 20) static const struct inode_operations coda_symlink_inode_operations = {
6b2553918d8b4 (Al Viro 2015-11-17 10:20:54 -0500 21) .get_link = page_get_link,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22) .setattr = coda_setattr,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 23) };
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 25) /* cnode.c */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 26) static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 27) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 28) coda_vattr_to_iattr(inode, attr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 29)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 30) if (S_ISREG(inode->i_mode)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31) inode->i_op = &coda_file_inode_operations;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32) inode->i_fop = &coda_file_operations;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 33) } else if (S_ISDIR(inode->i_mode)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 34) inode->i_op = &coda_dir_inode_operations;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 35) inode->i_fop = &coda_dir_operations;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 36) } else if (S_ISLNK(inode->i_mode)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 37) inode->i_op = &coda_symlink_inode_operations;
21fc61c73c390 (Al Viro 2015-11-17 01:07:57 -0500 38) inode_nohighmem(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 39) inode->i_data.a_ops = &coda_symlink_aops;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40) inode->i_mapping = &inode->i_data;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) } else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 42) init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 43) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 44)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 45) static int coda_test_inode(struct inode *inode, void *data)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 46) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 47) struct CodaFid *fid = (struct CodaFid *)data;
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 48) struct coda_inode_info *cii = ITOC(inode);
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 49) return coda_fideq(&cii->c_fid, fid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 50) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 51)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 52) static int coda_set_inode(struct inode *inode, void *data)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 53) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 54) struct CodaFid *fid = (struct CodaFid *)data;
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 55) struct coda_inode_info *cii = ITOC(inode);
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 56) cii->c_fid = *fid;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 57) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 58) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 59)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 60) struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 61) struct coda_vattr * attr)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 62) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63) struct inode *inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 64) struct coda_inode_info *cii;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 65) unsigned long hash = coda_f2i(fid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 66)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 67) inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 68)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 69) if (!inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 70) return ERR_PTR(-ENOMEM);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 71)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 72) if (inode->i_state & I_NEW) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 73) cii = ITOC(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 74) /* we still need to set i_ino for things like stat(2) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 75) inode->i_ino = hash;
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 76) /* inode is locked and unique, no need to grab cii->c_lock */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 77) cii->c_mapcount = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 78) unlock_new_inode(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 79) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 80)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 81) /* always replace the attributes, type might have changed */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 82) coda_fill_inode(inode, attr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83) return inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 84) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 85)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 86) /* this is effectively coda_iget:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 87) - get attributes (might be cached)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 88) - get the inode for the fid using vfs iget
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 89) - link the two up if this is needed
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 90) - fill in the attributes
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 91) */
f4947fbce2089 (Al Viro 2012-01-10 11:11:49 -0500 92) struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 93) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94) struct coda_vattr attr;
f4947fbce2089 (Al Viro 2012-01-10 11:11:49 -0500 95) struct inode *inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 96) int error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 97)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 98) /* We get inode numbers from Venus -- see venus source */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 99) error = venus_getattr(sb, fid, &attr);
f4947fbce2089 (Al Viro 2012-01-10 11:11:49 -0500 100) if (error)
f4947fbce2089 (Al Viro 2012-01-10 11:11:49 -0500 101) return ERR_PTR(error);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 102)
f4947fbce2089 (Al Viro 2012-01-10 11:11:49 -0500 103) inode = coda_iget(sb, fid, &attr);
f4947fbce2089 (Al Viro 2012-01-10 11:11:49 -0500 104) if (IS_ERR(inode))
6d6bd94f4d83d (Fabian Frederick 2014-06-06 14:36:20 -0700 105) pr_warn("%s: coda_iget failed\n", __func__);
f4947fbce2089 (Al Viro 2012-01-10 11:11:49 -0500 106) return inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 107) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 108)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109)
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 110) /* Although we treat Coda file identifiers as immutable, there is one
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 111) * special case for files created during a disconnection where they may
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 112) * not be globally unique. When an identifier collision is detected we
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 113) * first try to flush the cached inode from the kernel and finally
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 114) * resort to renaming/rehashing in-place. Userspace remembers both old
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 115) * and new values of the identifier to handle any in-flight upcalls.
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 116) * The real solution is to use globally unique UUIDs as identifiers, but
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 117) * retrofitting the existing userspace code for this is non-trivial. */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 118) void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 119) struct CodaFid *newfid)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 120) {
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 121) struct coda_inode_info *cii = ITOC(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 122) unsigned long hash = coda_f2i(newfid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 123)
c5d3237c2424c (Eric Sesterhenn 2006-03-24 18:42:13 +0100 124) BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 125)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 126) /* replace fid and rehash inode */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 127) /* XXX we probably need to hold some lock here! */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 128) remove_inode_hash(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 129) cii->c_fid = *newfid;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 130) inode->i_ino = hash;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 131) __insert_inode_hash(inode, hash);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 132) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 133)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 134) /* convert a fid to an inode. */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 135) struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 136) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 137) struct inode *inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 138) unsigned long hash = coda_f2i(fid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 139)
ed31a7dd636b2 (Jan Harkes 2007-07-19 01:48:44 -0700 140) inode = ilookup5(sb, hash, coda_test_inode, fid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 141) if ( !inode )
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 142) return NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 143)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 144) /* we should never see newly created inodes because we intentionally
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 145) * fail in the initialization callback */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 146) BUG_ON(inode->i_state & I_NEW);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 147)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 148) return inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 149) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 150)
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 151) struct coda_file_info *coda_ftoc(struct file *file)
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 152) {
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 153) struct coda_file_info *cfi = file->private_data;
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 154)
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 155) BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 156)
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 157) return cfi;
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 158)
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 159) }
5bb44810f47a0 (Fabian Frederick 2019-07-16 16:29:09 -0700 160)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 161) /* the CONTROL inode is made without asking attributes from Venus */
0b2c4e39c0142 (Al Viro 2012-01-10 10:46:03 -0500 162) struct inode *coda_cnode_makectl(struct super_block *sb)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 163) {
0b2c4e39c0142 (Al Viro 2012-01-10 10:46:03 -0500 164) struct inode *inode = new_inode(sb);
0b2c4e39c0142 (Al Viro 2012-01-10 10:46:03 -0500 165) if (inode) {
0b2c4e39c0142 (Al Viro 2012-01-10 10:46:03 -0500 166) inode->i_ino = CTL_INO;
0b2c4e39c0142 (Al Viro 2012-01-10 10:46:03 -0500 167) inode->i_op = &coda_ioctl_inode_operations;
0b2c4e39c0142 (Al Viro 2012-01-10 10:46:03 -0500 168) inode->i_fop = &coda_ioctl_operations;
0b2c4e39c0142 (Al Viro 2012-01-10 10:46:03 -0500 169) inode->i_mode = 0444;
0b2c4e39c0142 (Al Viro 2012-01-10 10:46:03 -0500 170) return inode;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 171) }
0b2c4e39c0142 (Al Viro 2012-01-10 10:46:03 -0500 172) return ERR_PTR(-ENOMEM);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 173) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 174)
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