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hostfs: simplify locking

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Remove dcache_lock locking from hostfs filesystem, and move it into dcache
helpers. All that is required is a coherent path name. Protection from
concurrent modification of the namespace after path name generation is not
provided in current code, because dcache_lock is dropped before the path is
used.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:29 +11:00
parent b1e6a015a5
commit ec2447c278
3 changed files with 24 additions and 17 deletions
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15
fs/dcache.c
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@@ -2171,7 +2171,7 @@ char *dynamic_dname(struct dentry *dentry, char *buffer, int buflen,
/*
* Write full pathname from the root of the filesystem into the buffer.
*/
char *__dentry_path(struct dentry *dentry, char *buf, int buflen)
static char *__dentry_path(struct dentry *dentry, char *buf, int buflen)
{
char *end = buf + buflen;
char *retval;
@@ -2198,7 +2198,18 @@ char *__dentry_path(struct dentry *dentry, char *buf, int buflen)
Elong:
return ERR_PTR(-ENAMETOOLONG);
}
EXPORT_SYMBOL(__dentry_path);
char *dentry_path_raw(struct dentry *dentry, char *buf, int buflen)
{
char *retval;
spin_lock(&dcache_lock);
retval = __dentry_path(dentry, buf, buflen);
spin_unlock(&dcache_lock);
return retval;
}
EXPORT_SYMBOL(dentry_path_raw);
char *dentry_path(struct dentry *dentry, char *buf, int buflen)
{