dentry.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:1k
- /*
- * linux/fs/hpfs/dentry.c
- *
- * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
- *
- * dcache operations
- */
- #include "hpfs_fn.h"
- /*
- * Note: the dentry argument is the parent dentry.
- */
- int hpfs_hash_dentry(struct dentry *dentry, struct qstr *qstr)
- {
- unsigned long hash;
- int i;
- unsigned l = qstr->len;
- if (l == 1) if (qstr->name[0]=='.') goto x;
- if (l == 2) if (qstr->name[0]=='.' || qstr->name[1]=='.') goto x;
- hpfs_adjust_length((char *)qstr->name, &l);
- /*if (hpfs_chk_name((char *)qstr->name,&l))*/
- /*return -ENAMETOOLONG;*/
- /*return -ENOENT;*/
- x:
- hash = init_name_hash();
- for (i = 0; i < l; i++)
- hash = partial_name_hash(hpfs_upcase(dentry->d_sb->s_hpfs_cp_table,qstr->name[i]), hash);
- qstr->hash = end_name_hash(hash);
- return 0;
- }
- int hpfs_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b)
- {
- unsigned al=a->len;
- unsigned bl=b->len;
- hpfs_adjust_length((char *)a->name, &al);
- /*hpfs_adjust_length((char *)b->name, &bl);*/
- /* 'a' is the qstr of an already existing dentry, so the name
- * must be valid. 'b' must be validated first.
- */
- if (hpfs_chk_name((char *)b->name, &bl)) return 1;
- if (hpfs_compare_names(dentry->d_sb, (char *)a->name, al, (char *)b->name, bl, 0)) return 1;
- return 0;
- }
- struct dentry_operations hpfs_dentry_operations = {
- d_hash: hpfs_hash_dentry,
- d_compare: hpfs_compare_dentry,
- };
- void hpfs_set_dentry_operations(struct dentry *dentry)
- {
- dentry->d_op = &hpfs_dentry_operations;
- }