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| author | Sage Weil <sage@newdream.net> | 2011-10-28 10:02:42 -0700 |
|---|---|---|
| committer | Christoph Hellwig <hch@serles.lst.de> | 2011-11-02 12:53:43 +0100 |
| commit | f0023bc617ba600956b9226f1806033d7486c8ba (patch) | |
| tree | 7a5ad7481b160e1d40cdc95626bfdb5e8577c88e /include/linux/dcache.h | |
| parent | a78ef704a8dd430225955f0709b22d4a6ba21deb (diff) | |
| download | linux-f0023bc617ba600956b9226f1806033d7486c8ba.tar.gz linux-f0023bc617ba600956b9226f1806033d7486c8ba.tar.xz | |
vfs: add d_prune dentry operation
This adds a d_prune dentry operation that is called by the VFS prior to
pruning (i.e. unhashing and killing) a hashed dentry from the dcache.
Wrap dentry_lru_del() and use the new _prune() helper in the cases where we
are about to unhash and kill the dentry.
This will be used by Ceph to maintain a flag indicating whether the
complete contents of a directory are contained in the dcache, allowing it
to satisfy lookups and readdir without addition server communication.
Renumber a few DCACHE_* #defines to group DCACHE_OP_PRUNE with the other
DCACHE_OP_ bits.
Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/linux/dcache.h')
| -rw-r--r-- | include/linux/dcache.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 62157c03caf7..4df926199369 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -165,6 +165,7 @@ struct dentry_operations { unsigned int, const char *, const struct qstr *); int (*d_delete)(const struct dentry *); void (*d_release)(struct dentry *); + void (*d_prune)(struct dentry *); void (*d_iput)(struct dentry *, struct inode *); char *(*d_dname)(struct dentry *, char *, int); struct vfsmount *(*d_automount)(struct path *); @@ -184,8 +185,9 @@ struct dentry_operations { #define DCACHE_OP_COMPARE 0x0002 #define DCACHE_OP_REVALIDATE 0x0004 #define DCACHE_OP_DELETE 0x0008 +#define DCACHE_OP_PRUNE 0x0010 -#define DCACHE_DISCONNECTED 0x0010 +#define DCACHE_DISCONNECTED 0x0020 /* This dentry is possibly not currently connected to the dcache tree, in * which case its parent will either be itself, or will have this flag as * well. nfsd will not use a dentry with this bit set, but will first @@ -196,8 +198,8 @@ struct dentry_operations { * dentry into place and return that dentry rather than the passed one, * typically using d_splice_alias. */ -#define DCACHE_REFERENCED 0x0020 /* Recently used, don't discard. */ -#define DCACHE_RCUACCESS 0x0040 /* Entry has ever been RCU-visible */ +#define DCACHE_REFERENCED 0x0040 /* Recently used, don't discard. */ +#define DCACHE_RCUACCESS 0x0080 /* Entry has ever been RCU-visible */ #define DCACHE_CANT_MOUNT 0x0100 #define DCACHE_GENOCIDE 0x0200 |