621e155a35
Change d_compare so it may be called from lock-free RCU lookups. This does put significant restrictions on what may be done from the callback, however there don't seem to have been any problems with in-tree fses. If some strange use case pops up that _really_ cannot cope with the rcu-walk rules, we can just add new rcu-unaware callbacks, which would cause name lookup to drop out of rcu-walk mode. For in-tree filesystems, this is just a mechanical change. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*
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* linux/fs/hpfs/dentry.c
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* dcache operations
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*/
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#include "hpfs_fn.h"
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/*
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* Note: the dentry argument is the parent dentry.
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*/
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static int hpfs_hash_dentry(struct dentry *dentry, struct qstr *qstr)
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{
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unsigned long hash;
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int i;
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unsigned l = qstr->len;
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if (l == 1) if (qstr->name[0]=='.') goto x;
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if (l == 2) if (qstr->name[0]=='.' || qstr->name[1]=='.') goto x;
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hpfs_adjust_length(qstr->name, &l);
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/*if (hpfs_chk_name(qstr->name,&l))*/
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/*return -ENAMETOOLONG;*/
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/*return -ENOENT;*/
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x:
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hash = init_name_hash();
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for (i = 0; i < l; i++)
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hash = partial_name_hash(hpfs_upcase(hpfs_sb(dentry->d_sb)->sb_cp_table,qstr->name[i]), hash);
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qstr->hash = end_name_hash(hash);
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return 0;
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}
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static int hpfs_compare_dentry(const struct dentry *parent,
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const struct inode *pinode,
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const struct dentry *dentry, const struct inode *inode,
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unsigned int len, const char *str, const struct qstr *name)
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{
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unsigned al = len;
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unsigned bl = name->len;
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hpfs_adjust_length(str, &al);
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/*hpfs_adjust_length(b->name, &bl);*/
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/*
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* 'str' is the nane of an already existing dentry, so the name
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* must be valid. 'name' must be validated first.
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*/
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if (hpfs_chk_name(name->name, &bl))
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return 1;
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if (hpfs_compare_names(parent->d_sb, str, al, name->name, bl, 0))
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return 1;
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return 0;
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}
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static const struct dentry_operations hpfs_dentry_operations = {
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.d_hash = hpfs_hash_dentry,
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.d_compare = hpfs_compare_dentry,
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};
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void hpfs_set_dentry_operations(struct dentry *dentry)
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{
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dentry->d_op = &hpfs_dentry_operations;
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}
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