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![Jan Harkes](/assets/img/avatar_default.png)
Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
166 lines
4.1 KiB
C
166 lines
4.1 KiB
C
/* 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_linux.h>
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#include <linux/coda_fs_i.h>
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#include <linux/coda_psdev.h>
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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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static const struct inode_operations coda_symlink_inode_operations = {
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.readlink = generic_readlink,
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.follow_link = page_follow_link_light,
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.put_link = page_put_link,
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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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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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return coda_fideq(&(ITOC(inode)->c_fid), fid);
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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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ITOC(inode)->c_fid = *fid;
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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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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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int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb)
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{
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struct coda_vattr attr;
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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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if ( error ) {
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*inode = NULL;
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return error;
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}
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*inode = coda_iget(sb, fid, &attr);
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if ( IS_ERR(*inode) ) {
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printk("coda_cnode_make: coda_iget failed\n");
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return PTR_ERR(*inode);
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}
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return 0;
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}
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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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struct coda_inode_info *cii;
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unsigned long hash = coda_f2i(newfid);
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cii = ITOC(inode);
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BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
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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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printk("coda_fid_to_inode: no sb!\n");
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return NULL;
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}
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inode = ilookup5(sb, hash, coda_test_inode, fid);
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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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int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
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{
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int error = -ENOMEM;
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*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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error = 0;
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}
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return error;
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}
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