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| author | David Howells <dhowells@redhat.com> | 2015-01-29 12:02:28 +0000 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-02-22 11:38:38 -0500 |
| commit | df1a085af1f652a02238168c4f2b730c8c90dd4a (patch) | |
| tree | e9f269431a6ed4ec7a70de68cd9b62b0bcbe2dea /include | |
| parent | e7f7d2253c05143ed76ddc5e11f4cf0a9b814a27 (diff) | |
| download | linux-df1a085af1f652a02238168c4f2b730c8c90dd4a.tar.gz linux-df1a085af1f652a02238168c4f2b730c8c90dd4a.tar.bz2 linux-df1a085af1f652a02238168c4f2b730c8c90dd4a.zip | |
VFS: Add a fallthrough flag for marking virtual dentries
Add a DCACHE_FALLTHRU flag to indicate that, in a layered filesystem, this is
a virtual dentry that covers another one in a lower layer that should be used
instead. This may be recorded on medium if directory integration is stored
there.
The flag can be set with d_set_fallthru() and tested with d_is_fallthru().
Original-author: Valerie Aurora <vaurora@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dcache.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 98d2a948a08e..728f5d31b5e6 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -223,6 +223,7 @@ struct dentry_operations { #define DCACHE_FILE_TYPE 0x00500000 /* Other file type (or fallthru to such) */ #define DCACHE_MAY_FREE 0x00800000 +#define DCACHE_FALLTHRU 0x01000000 /* Fall through to lower layer */ extern seqlock_t rename_lock; @@ -470,6 +471,14 @@ static inline bool d_is_positive(const struct dentry *dentry) return !d_is_negative(dentry); } +extern void d_set_fallthru(struct dentry *dentry); + +static inline bool d_is_fallthru(const struct dentry *dentry) +{ + return dentry->d_flags & DCACHE_FALLTHRU; +} + + extern int sysctl_vfs_cache_pressure; static inline unsigned long vfs_pressure_ratio(unsigned long val) |