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1275 |
phoenix |
/*
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* linux/fs/hfs/sysdep.c
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*
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* Copyright (C) 1996 Paul H. Hargrove
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* This file may be distributed under the terms of the GNU General Public License.
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*
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* This file contains the code to do various system dependent things.
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*
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* "XXX" in a comment is a note to myself to consider changing something.
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*
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* In function preconditions the term "valid" applied to a pointer to
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* a structure means that the pointer is non-NULL and the structure it
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* points to has all fields initialized to consistent values.
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*/
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#include "hfs.h"
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#include <linux/hfs_fs_sb.h>
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#include <linux/hfs_fs_i.h>
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#include <linux/hfs_fs.h>
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#include <linux/smp_lock.h>
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static int hfs_revalidate_dentry(struct dentry *, int);
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static int hfs_hash_dentry(struct dentry *, struct qstr *);
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static int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
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static void hfs_dentry_iput(struct dentry *, struct inode *);
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struct dentry_operations hfs_dentry_operations =
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{
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d_revalidate: hfs_revalidate_dentry,
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d_hash: hfs_hash_dentry,
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d_compare: hfs_compare_dentry,
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d_iput: hfs_dentry_iput,
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};
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/*
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* hfs_buffer_get()
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*
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* Return a buffer for the 'block'th block of the media.
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* If ('read'==0) then the buffer is not read from disk.
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*/
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hfs_buffer hfs_buffer_get(hfs_sysmdb sys_mdb, int block, int read) {
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hfs_buffer tmp = HFS_BAD_BUFFER;
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if (read) {
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tmp = sb_bread(sys_mdb, block);
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} else {
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tmp = sb_getblk(sys_mdb, block);
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if (tmp) {
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mark_buffer_uptodate(tmp, 1);
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}
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}
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if (!tmp) {
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hfs_error("hfs_fs: unable to read block 0x%08x from dev %s\n",
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block, hfs_mdb_name(sys_mdb));
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}
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return tmp;
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}
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/* dentry case-handling: just lowercase everything */
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/* hfs_strhash now uses the same hashing function as the dcache. */
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static int hfs_hash_dentry(struct dentry *dentry, struct qstr *this)
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{
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if (this->len > HFS_NAMELEN)
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return 0;
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this->hash = hfs_strhash(this->name, this->len);
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return 0;
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}
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/* return 1 on failure and 0 on success */
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static int hfs_compare_dentry(struct dentry *dentry, struct qstr *a,
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struct qstr *b)
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{
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if (a->len != b->len) return 1;
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if (a->len > HFS_NAMELEN)
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return 1;
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return !hfs_streq(a->name, a->len, b->name, b->len);
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}
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static void hfs_dentry_iput(struct dentry *dentry, struct inode *inode)
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{
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struct hfs_cat_entry *entry = HFS_I(inode)->entry;
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lock_kernel();
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entry->sys_entry[HFS_ITYPE_TO_INT(HFS_ITYPE(inode->i_ino))] = NULL;
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unlock_kernel();
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iput(inode);
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}
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static int hfs_revalidate_dentry(struct dentry *dentry, int flags)
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{
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struct inode *inode = dentry->d_inode;
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int diff;
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/* fix up inode on a timezone change */
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lock_kernel();
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if (inode &&
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(diff = (hfs_to_utc(0) - HFS_I(inode)->tz_secondswest))) {
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inode->i_ctime += diff;
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inode->i_atime += diff;
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inode->i_mtime += diff;
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HFS_I(inode)->tz_secondswest += diff;
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}
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unlock_kernel();
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return 1;
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}
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