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| author |   Eric Dumazet <dada1@cosmosbay.com> | 2007-05-08 00:26:18 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 11:15:03 -0700 |
| commit | c23fbb6bcb3eb9cdf39a103edadf57bde8ce309c (patch) | |
| tree | d79ab2278774de2c1a8061aa948ed068902e87b4 /include/linux/dcache.h | |
| parent | add file position info to proc (diff) | |
| download | linux-dev-c23fbb6bcb3eb9cdf39a103edadf57bde8ce309c.tar.xz linux-dev-c23fbb6bcb3eb9cdf39a103edadf57bde8ce309c.zip | |
VFS: delay the dentry name generation on sockets and pipes
1) Introduces a new method in 'struct dentry_operations'. This method
called d_dname() might be called from d_path() to build a pathname for
special filesystems. It is called without locks.
Future patches (if we succeed in having one common dentry for all
pipes/sockets) may need to change prototype of this method, but we now
use : char *d_dname(struct dentry *dentry, char *buffer, int buflen);
2) Adds a dynamic_dname() helper function that eases d_dname() implementations
3) Defines d_dname method for sockets : No more sprintf() at socket
creation. This is delayed up to the moment someone does an access to
/proc/pid/fd/...
4) Defines d_dname method for pipes : No more sprintf() at pipe
creation. This is delayed up to the moment someone does an access to
/proc/pid/fd/...
A benchmark consisting of 1.000.000 calls to pipe()/close()/close() gives a
*nice* speedup on my Pentium(M) 1.6 Ghz :
3.090 s instead of 3.450 s
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Christoph Hellwig <hch@infradead.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/dcache.h')
| -rw-r--r-- | include/linux/dcache.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 63f64a9a5bf7..aab53df4fafa 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -133,6 +133,7 @@ struct dentry_operations { int (*d_delete)(struct dentry *); void (*d_release)(struct dentry *); void (*d_iput)(struct dentry *, struct inode *); + char *(*d_dname)(struct dentry *, char *, int); }; /* the dentry parameter passed to d_hash and d_compare is the parent @@ -293,6 +294,11 @@ extern struct dentry * d_hash_and_lookup(struct dentry *, struct qstr *); /* validate "insecure" dentry pointer */ extern int d_validate(struct dentry *, struct dentry *); +/* + * helper function for dentry_operations.d_dname() members + */ +extern char *dynamic_dname(struct dentry *, char *, int, const char *, ...); + extern char * d_path(struct dentry *, struct vfsmount *, char *, int); /* Allocation counts.. */ |