find_inode_nowait — find an inode in the inode cache
struct inode * find_inode_nowait ( | struct super_block * sb, |
| unsigned long hashval, | |
int (*match)
(struct inode *, unsigned long, void *), | |
void * data); |
sbsuper block of file system to search
hashvalhash value (usually inode number) to search for
matchcallback used for comparisons between inodes
data
opaque data pointer to pass to match
Search for the inode specified by hashval and data in the inode
cache, where the helper function match will return 0 if the inode
does not match, 1 if the inode does match, and -1 if the search
should be stopped. The match function must be responsible for
taking the i_lock spin_lock and checking i_state for an inode being
freed or being initialized, and incrementing the reference count
before returning 1. It also must not sleep, since it is called with
the inode_hash_lock spinlock held.
This is a even more generalized version of ilookup5 when the
function must never block --- find_inode can block in
__wait_on_freeing_inode --- or when the caller can not increment
the reference count because the resulting iput might cause an
inode eviction. The tradeoff is that the match funtion must be
very carefully implemented.