2005-04-16 16:20:36 -06:00
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/* cnode related routines for the coda kernel code
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(C) 1996 Peter Braam
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*/
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/time.h>
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#include <linux/coda.h>
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#include <linux/coda_psdev.h>
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2015-11-16 23:07:57 -07:00
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#include <linux/pagemap.h>
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2011-01-12 14:36:09 -07:00
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#include "coda_linux.h"
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2005-04-16 16:20:36 -06:00
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static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
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{
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return memcmp(fid1, fid2, sizeof(*fid1)) == 0;
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}
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2007-02-12 01:55:38 -07:00
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static const struct inode_operations coda_symlink_inode_operations = {
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2005-04-16 16:20:36 -06:00
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.readlink = generic_readlink,
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2015-11-17 08:20:54 -07:00
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.get_link = page_get_link,
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2005-04-16 16:20:36 -06:00
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.setattr = coda_setattr,
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};
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/* cnode.c */
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static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr)
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{
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coda_vattr_to_iattr(inode, attr);
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if (S_ISREG(inode->i_mode)) {
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inode->i_op = &coda_file_inode_operations;
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inode->i_fop = &coda_file_operations;
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} else if (S_ISDIR(inode->i_mode)) {
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inode->i_op = &coda_dir_inode_operations;
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inode->i_fop = &coda_dir_operations;
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} else if (S_ISLNK(inode->i_mode)) {
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inode->i_op = &coda_symlink_inode_operations;
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2015-11-16 23:07:57 -07:00
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inode_nohighmem(inode);
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2005-04-16 16:20:36 -06:00
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inode->i_data.a_ops = &coda_symlink_aops;
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inode->i_mapping = &inode->i_data;
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} else
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init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));
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}
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static int coda_test_inode(struct inode *inode, void *data)
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{
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struct CodaFid *fid = (struct CodaFid *)data;
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2010-10-25 00:03:44 -06:00
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struct coda_inode_info *cii = ITOC(inode);
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return coda_fideq(&cii->c_fid, fid);
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2005-04-16 16:20:36 -06:00
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}
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static int coda_set_inode(struct inode *inode, void *data)
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{
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struct CodaFid *fid = (struct CodaFid *)data;
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2010-10-25 00:03:44 -06:00
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struct coda_inode_info *cii = ITOC(inode);
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cii->c_fid = *fid;
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2005-04-16 16:20:36 -06:00
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return 0;
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}
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struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
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struct coda_vattr * attr)
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{
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struct inode *inode;
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struct coda_inode_info *cii;
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unsigned long hash = coda_f2i(fid);
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inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (inode->i_state & I_NEW) {
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cii = ITOC(inode);
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/* we still need to set i_ino for things like stat(2) */
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inode->i_ino = hash;
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2010-10-25 00:03:44 -06:00
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/* inode is locked and unique, no need to grab cii->c_lock */
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2005-04-16 16:20:36 -06:00
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cii->c_mapcount = 0;
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unlock_new_inode(inode);
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}
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/* always replace the attributes, type might have changed */
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coda_fill_inode(inode, attr);
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return inode;
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}
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/* this is effectively coda_iget:
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- get attributes (might be cached)
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- get the inode for the fid using vfs iget
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- link the two up if this is needed
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- fill in the attributes
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*/
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2012-01-10 09:11:49 -07:00
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struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb)
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2005-04-16 16:20:36 -06:00
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{
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struct coda_vattr attr;
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2012-01-10 09:11:49 -07:00
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struct inode *inode;
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2005-04-16 16:20:36 -06:00
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int error;
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/* We get inode numbers from Venus -- see venus source */
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error = venus_getattr(sb, fid, &attr);
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2012-01-10 09:11:49 -07:00
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if (error)
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return ERR_PTR(error);
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2005-04-16 16:20:36 -06:00
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2012-01-10 09:11:49 -07:00
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inode = coda_iget(sb, fid, &attr);
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if (IS_ERR(inode))
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2014-06-06 15:36:20 -06:00
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pr_warn("%s: coda_iget failed\n", __func__);
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2012-01-10 09:11:49 -07:00
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return inode;
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2005-04-16 16:20:36 -06:00
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}
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2010-10-25 00:03:44 -06:00
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/* Although we treat Coda file identifiers as immutable, there is one
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* special case for files created during a disconnection where they may
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* not be globally unique. When an identifier collision is detected we
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* first try to flush the cached inode from the kernel and finally
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* resort to renaming/rehashing in-place. Userspace remembers both old
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* and new values of the identifier to handle any in-flight upcalls.
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* The real solution is to use globally unique UUIDs as identifiers, but
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* retrofitting the existing userspace code for this is non-trivial. */
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2005-04-16 16:20:36 -06:00
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void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid,
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struct CodaFid *newfid)
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{
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2010-10-25 00:03:44 -06:00
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struct coda_inode_info *cii = ITOC(inode);
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2005-04-16 16:20:36 -06:00
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unsigned long hash = coda_f2i(newfid);
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2006-03-24 10:42:13 -07:00
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BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
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2005-04-16 16:20:36 -06:00
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/* replace fid and rehash inode */
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/* XXX we probably need to hold some lock here! */
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remove_inode_hash(inode);
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cii->c_fid = *newfid;
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inode->i_ino = hash;
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__insert_inode_hash(inode, hash);
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}
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/* convert a fid to an inode. */
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struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb)
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{
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struct inode *inode;
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unsigned long hash = coda_f2i(fid);
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if ( !sb ) {
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2014-06-06 15:36:20 -06:00
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pr_warn("%s: no sb!\n", __func__);
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2005-04-16 16:20:36 -06:00
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return NULL;
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}
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2007-07-19 02:48:44 -06:00
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inode = ilookup5(sb, hash, coda_test_inode, fid);
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2005-04-16 16:20:36 -06:00
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if ( !inode )
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return NULL;
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/* we should never see newly created inodes because we intentionally
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* fail in the initialization callback */
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BUG_ON(inode->i_state & I_NEW);
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return inode;
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}
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/* the CONTROL inode is made without asking attributes from Venus */
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2012-01-10 08:46:03 -07:00
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struct inode *coda_cnode_makectl(struct super_block *sb)
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2005-04-16 16:20:36 -06:00
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{
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2012-01-10 08:46:03 -07:00
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struct inode *inode = new_inode(sb);
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if (inode) {
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inode->i_ino = CTL_INO;
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inode->i_op = &coda_ioctl_inode_operations;
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inode->i_fop = &coda_ioctl_operations;
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inode->i_mode = 0444;
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return inode;
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2005-04-16 16:20:36 -06:00
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}
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2012-01-10 08:46:03 -07:00
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return ERR_PTR(-ENOMEM);
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2005-04-16 16:20:36 -06:00
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}
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