diff options
| -rw-r--r-- | fs/dcache.c | 19 | ||||
| -rw-r--r-- | include/linux/dcache.h | 9 |
2 files changed, 27 insertions, 1 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index dc400fd29f4d..e33a0934efd7 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1659,6 +1659,22 @@ void d_set_d_op(struct dentry *dentry, const struct dentry_operations *op) } EXPORT_SYMBOL(d_set_d_op); + +/* + * d_set_fallthru - Mark a dentry as falling through to a lower layer + * @dentry - The dentry to mark + * + * Mark a dentry as falling through to the lower layer (as set with + * d_pin_lower()). This flag may be recorded on the medium. + */ +void d_set_fallthru(struct dentry *dentry) +{ + spin_lock(&dentry->d_lock); + dentry->d_flags |= DCACHE_FALLTHRU; + spin_unlock(&dentry->d_lock); +} +EXPORT_SYMBOL(d_set_fallthru); + static unsigned d_flags_for_inode(struct inode *inode) { unsigned add_flags = DCACHE_FILE_TYPE; @@ -1691,7 +1707,8 @@ static void __d_instantiate(struct dentry *dentry, struct inode *inode) unsigned add_flags = d_flags_for_inode(inode); spin_lock(&dentry->d_lock); - __d_set_type(dentry, add_flags); + dentry->d_flags &= ~(DCACHE_ENTRY_TYPE | DCACHE_FALLTHRU); + dentry->d_flags |= add_flags; if (inode) hlist_add_head(&dentry->d_u.d_alias, &inode->i_dentry); dentry->d_inode = inode; 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) |
