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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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13
fs/proc/proc_sysctl.c
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@ -397,15 +397,16 @@ static int proc_sys_delete(const struct dentry *dentry)
return !!PROC_I(dentry->d_inode)->sysctl->unregistering;
}
static int proc_sys_compare(struct dentry *dir, struct qstr *qstr,
struct qstr *name)
static int proc_sys_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)
{
struct dentry *dentry = container_of(qstr, struct dentry, d_name);
if (qstr->len != name->len)
if (name->len != len)
return 1;
if (memcmp(qstr->name, name->name, name->len))
if (memcmp(name->name, str, len))
return 1;
return !sysctl_is_seen(PROC_I(dentry->d_inode)->sysctl);
return !sysctl_is_seen(PROC_I(inode)->sysctl);
}
static const struct dentry_operations proc_sys_dentry_operations = {