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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180// SPDX-License-Identifier: GPL-2.0/* cnode related routines for the coda kernel code (C) 1996 Peter Braam */
#include <linux/types.h>#include <linux/string.h>#include <linux/time.h>
#include <linux/coda.h>#include <linux/pagemap.h>#include "coda_psdev.h"#include "coda_linux.h"
static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2){ return memcmp(fid1, fid2, sizeof(*fid1)) == 0;}
static const struct inode_operations coda_symlink_inode_operations = { .get_link = page_get_link, .setattr = coda_setattr,};
/* cnode.c */static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr){ coda_vattr_to_iattr(inode, attr);
if (S_ISREG(inode->i_mode)) { inode->i_op = &coda_file_inode_operations; inode->i_fop = &coda_file_operations; } else if (S_ISDIR(inode->i_mode)) { inode->i_op = &coda_dir_inode_operations; inode->i_fop = &coda_dir_operations; } else if (S_ISLNK(inode->i_mode)) { inode->i_op = &coda_symlink_inode_operations; inode_nohighmem(inode); inode->i_data.a_ops = &coda_symlink_aops; inode->i_mapping = &inode->i_data; } else init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));}
static int coda_test_inode(struct inode *inode, void *data){ struct CodaFid *fid = (struct CodaFid *)data; struct coda_inode_info *cii = ITOC(inode); return coda_fideq(&cii->c_fid, fid);}
static int coda_set_inode(struct inode *inode, void *data){ struct CodaFid *fid = (struct CodaFid *)data; struct coda_inode_info *cii = ITOC(inode); cii->c_fid = *fid; return 0;}
struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid, struct coda_vattr * attr){ struct inode *inode; struct coda_inode_info *cii; unsigned long hash = coda_f2i(fid); umode_t inode_type = coda_inode_type(attr);
retry: inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid); if (!inode) return ERR_PTR(-ENOMEM);
if (inode_state_read_once(inode) & I_NEW) { cii = ITOC(inode); /* we still need to set i_ino for things like stat(2) */ inode->i_ino = hash; /* inode is locked and unique, no need to grab cii->c_lock */ cii->c_mapcount = 0; coda_fill_inode(inode, attr); unlock_new_inode(inode); } else if ((inode->i_mode & S_IFMT) != inode_type) { /* Inode has changed type, mark bad and grab a new one */ remove_inode_hash(inode); coda_flag_inode(inode, C_PURGE); iput(inode); goto retry; } return inode;}
/* this is effectively coda_iget: - get attributes (might be cached) - get the inode for the fid using vfs iget - link the two up if this is needed - fill in the attributes*/struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb){ struct coda_vattr attr; struct inode *inode; int error; /* We get inode numbers from Venus -- see venus source */ error = venus_getattr(sb, fid, &attr); if (error) return ERR_PTR(error);
inode = coda_iget(sb, fid, &attr); if (IS_ERR(inode)) pr_warn("%s: coda_iget failed\n", __func__); return inode;}
/* Although we treat Coda file identifiers as immutable, there is one * special case for files created during a disconnection where they may * not be globally unique. When an identifier collision is detected we * first try to flush the cached inode from the kernel and finally * resort to renaming/rehashing in-place. Userspace remembers both old * and new values of the identifier to handle any in-flight upcalls. * The real solution is to use globally unique UUIDs as identifiers, but * retrofitting the existing userspace code for this is non-trivial. */void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, struct CodaFid *newfid){ struct coda_inode_info *cii = ITOC(inode); unsigned long hash = coda_f2i(newfid); BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
/* replace fid and rehash inode */ /* XXX we probably need to hold some lock here! */ remove_inode_hash(inode); cii->c_fid = *newfid; inode->i_ino = hash; __insert_inode_hash(inode, hash);}
/* convert a fid to an inode. */struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) { struct inode *inode; unsigned long hash = coda_f2i(fid);
inode = ilookup5(sb, hash, coda_test_inode, fid); if ( !inode ) return NULL;
/* we should never see newly created inodes because we intentionally * fail in the initialization callback */ BUG_ON(inode_state_read_once(inode) & I_NEW);
return inode;}
struct coda_file_info *coda_ftoc(struct file *file){ struct coda_file_info *cfi = file->private_data;
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
return cfi;
}
/* the CONTROL inode is made without asking attributes from Venus */struct inode *coda_cnode_makectl(struct super_block *sb){ struct inode *inode = new_inode(sb); if (inode) { inode->i_ino = CTL_INO; inode->i_op = &coda_ioctl_inode_operations; inode->i_fop = &coda_ioctl_operations; inode->i_mode = 0444; return inode; } return ERR_PTR(-ENOMEM);}