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fs: change d_compare for rcu-walk

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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>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:27 +11:00
parent fb2d5b86af
commit 621e155a35
23 changed files with 242 additions and 157 deletions
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8
fs/adfs/dir.c
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@@ -237,17 +237,19 @@ adfs_hash(struct dentry *parent, struct qstr *qstr)
* requirements of the underlying filesystem.
*/
static int
adfs_compare(struct dentry *parent, struct qstr *entry, struct qstr *name)
adfs_compare(const struct dentry *parent, const struct inode *pinode,
const struct dentry *dentry, const struct inode *inode,
unsigned int len, const char *str, const struct qstr *name)
{
int i;
if (entry->len != name->len)
if (len != name->len)
return 1;
for (i = 0; i < name->len; i++) {
char a, b;
a = entry->name[i];
a = str[i];
b = name->name[i];
if (a >= 'A' && a <= 'Z')