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| author | Anand V. Avati <avati@redhat.com> | 2012-08-19 08:53:23 -0400 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2013-01-24 16:21:25 +0100 |
| commit | 0b05b18381eea98c9c9ada95629bf659a88c9374 (patch) | |
| tree | a6389eaffda03a2e28cb05be242e03ef839fcb91 /include/uapi | |
| parent | ff7532ca2c631e7e96dcd305a967b610259dc0ea (diff) | |
| download | linux-0b05b18381eea98c9c9ada95629bf659a88c9374.tar.gz linux-0b05b18381eea98c9c9ada95629bf659a88c9374.tar.bz2 linux-0b05b18381eea98c9c9ada95629bf659a88c9374.zip | |
fuse: implement NFS-like readdirplus support
This patch implements readdirplus support in FUSE, similar to NFS.
The payload returned in the readdirplus call contains
'fuse_entry_out' structure thereby providing all the necessary inputs
for 'faking' a lookup() operation on the spot.
If the dentry and inode already existed (for e.g. in a re-run of ls -l)
then just the inode attributes timeout and dentry timeout are refreshed.
With a simple client->network->server implementation of a FUSE based
filesystem, the following performance observations were made:
Test: Performing a filesystem crawl over 20,000 files with
sh# time ls -lR /mnt
Without readdirplus:
Run 1: 18.1s
Run 2: 16.0s
Run 3: 16.2s
With readdirplus:
Run 1: 4.1s
Run 2: 3.8s
Run 3: 3.8s
The performance improvement is significant as it avoided 20,000 upcalls
calls (lookup). Cache consistency is no worse than what already is.
Signed-off-by: Anand V. Avati <avati@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/fuse.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h index d8c713e148e3..5dc1fea49ecd 100644 --- a/include/uapi/linux/fuse.h +++ b/include/uapi/linux/fuse.h @@ -193,6 +193,7 @@ struct fuse_file_lock { #define FUSE_FLOCK_LOCKS (1 << 10) #define FUSE_HAS_IOCTL_DIR (1 << 11) #define FUSE_AUTO_INVAL_DATA (1 << 12) +#define FUSE_DO_READDIRPLUS (1 << 13) /** * CUSE INIT request/reply flags @@ -299,6 +300,7 @@ enum fuse_opcode { FUSE_NOTIFY_REPLY = 41, FUSE_BATCH_FORGET = 42, FUSE_FALLOCATE = 43, + FUSE_READDIRPLUS = 44, /* CUSE specific operations */ CUSE_INIT = 4096, @@ -630,6 +632,16 @@ struct fuse_dirent { #define FUSE_DIRENT_SIZE(d) \ FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen) +struct fuse_direntplus { + struct fuse_entry_out entry_out; + struct fuse_dirent dirent; +}; + +#define FUSE_NAME_OFFSET_DIRENTPLUS \ + offsetof(struct fuse_direntplus, dirent.name) +#define FUSE_DIRENTPLUS_SIZE(d) \ + FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET_DIRENTPLUS + (d)->dirent.namelen) + struct fuse_notify_inval_inode_out { __u64 ino; __s64 off; |