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authorEric Dumazet <dada1@cosmosbay.com>2007-05-08 11:26:18 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 22:15:03 +0400
commitc23fbb6bcb3eb9cdf39a103edadf57bde8ce309c (patch)
treed79ab2278774de2c1a8061aa948ed068902e87b4 /Documentation/filesystems/Locking
parent2793274298c4423d79701e9a8190f2940bf3c785 (diff)
downloadlinux-c23fbb6bcb3eb9cdf39a103edadf57bde8ce309c.tar.xz
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 'Documentation/filesystems/Locking')
-rw-r--r--Documentation/filesystems/Locking2
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 28bfea75bcf2..59c14159cc47 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -15,6 +15,7 @@ prototypes:
int (*d_delete)(struct dentry *);
void (*d_release)(struct dentry *);
void (*d_iput)(struct dentry *, struct inode *);
+ char *(*d_dname)((struct dentry *dentry, char *buffer, int buflen);
locking rules:
none have BKL
@@ -25,6 +26,7 @@ d_compare: no yes no no
d_delete: yes no yes no
d_release: no no no yes
d_iput: no no no yes
+d_dname: no no no no
--------------------------- inode_operations ---------------------------
prototypes: