sysdep.c

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    1 /*
    2  * linux/fs/hfs/sysdep.c
    3  *
    4  * Copyright (C) 1996  Paul H. Hargrove
    5  * This file may be distributed under the terms of the GNU General Public License.
    6  *
    7  * This file contains the code to do various system dependent things.
    8  *
    9  * "XXX" in a comment is a note to myself to consider changing something.
   10  *
   11  * In function preconditions the term "valid" applied to a pointer to
   12  * a structure means that the pointer is non-NULL and the structure it
   13  * points to has all fields initialized to consistent values.
   14  */
   15 
   16 #include "hfs.h"
   17 #include <linux/hfs_fs_sb.h>
   18 #include <linux/hfs_fs_i.h>
   19 #include <linux/hfs_fs.h>
   20 #include <linux/smp_lock.h>
   21 
   22 static int hfs_revalidate_dentry(struct dentry *, int);
   23 static int hfs_hash_dentry(struct dentry *, struct qstr *);
   24 static int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
   25 static void hfs_dentry_iput(struct dentry *, struct inode *);
   26 struct dentry_operations hfs_dentry_operations =
   27 {
   28         d_revalidate:   hfs_revalidate_dentry,  
   29         d_hash:         hfs_hash_dentry,
   30         d_compare:      hfs_compare_dentry,
   31         d_iput:         hfs_dentry_iput,
   32 };
   33 
   34 /*
   35  * hfs_buffer_get()
   36  *
   37  * Return a buffer for the 'block'th block of the media.
   38  * If ('read'==0) then the buffer is not read from disk.
   39  */
   40 hfs_buffer hfs_buffer_get(hfs_sysmdb sys_mdb, int block, int read) {
   41         hfs_buffer tmp = HFS_BAD_BUFFER;
   42 
   43         if (read) {
   44                 tmp = sb_bread(sys_mdb, block);
   45         } else {
   46                 tmp = sb_getblk(sys_mdb, block);
   47                 if (tmp) {
   48                         mark_buffer_uptodate(tmp, 1);
   49                 }
   50         }
   51         if (!tmp) {
   52                 hfs_error("hfs_fs: unable to read block 0x%08x from dev %s\n",
   53                           block, hfs_mdb_name(sys_mdb));
   54         }
   55 
   56         return tmp;
   57 }
   58 
   59 /* dentry case-handling: just lowercase everything */
   60 
   61 /* hfs_strhash now uses the same hashing function as the dcache. */
   62 static int hfs_hash_dentry(struct dentry *dentry, struct qstr *this)
   63 {
   64         if (this->len > HFS_NAMELEN)
   65                 return 0;
   66         
   67         this->hash = hfs_strhash(this->name, this->len);
   68         return 0;
   69 }
   70 
   71 /* return 1 on failure and 0 on success */
   72 static int hfs_compare_dentry(struct dentry *dentry, struct qstr *a, 
   73                               struct qstr *b)
   74 {
   75         if (a->len != b->len) return 1;
   76 
   77         if (a->len > HFS_NAMELEN)
   78           return 1;
   79 
   80         return !hfs_streq(a->name, a->len, b->name, b->len);
   81 }
   82 
   83 static void hfs_dentry_iput(struct dentry *dentry, struct inode *inode)
   84 {
   85         struct hfs_cat_entry *entry = HFS_I(inode)->entry;
   86 
   87         lock_kernel();
   88         entry->sys_entry[HFS_ITYPE_TO_INT(HFS_ITYPE(inode->i_ino))] = NULL;
   89         unlock_kernel();
   90         iput(inode);
   91 }
   92 
   93 static int hfs_revalidate_dentry(struct dentry *dentry, int flags)
   94 {
   95         struct inode *inode = dentry->d_inode;
   96         int diff;
   97 
   98         /* fix up inode on a timezone change */
   99         lock_kernel();
  100         if (inode && 
  101             (diff = (hfs_to_utc(0) - HFS_I(inode)->tz_secondswest))) {
  102                 inode->i_ctime += diff;
  103                 inode->i_atime += diff;
  104                 inode->i_mtime += diff;
  105                 HFS_I(inode)->tz_secondswest += diff;
  106         }
  107         unlock_kernel();
  108         return 1;
  109 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/hfs/sysdep.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/hfs/sysdep.c