From 30c6a23d34cbe19162240e9f9c2c122ba807e58c Mon Sep 17 00:00:00 2001 From: Khazhismel Kumykov Date: Mon, 16 Sep 2019 16:56:41 -0700 Subject: fuse: on 64-bit store time in d_fsdata directly Implements the optimization noted in commit f75fdf22b0a8 ("fuse: don't use ->d_time"), as the additional memory can be significant. (In particular, on SLAB configurations this 8-byte alloc becomes 32 bytes). Per-dentry, this can consume significant memory. Reviewed-by: Shakeel Butt Signed-off-by: Khazhismel Kumykov Signed-off-by: Miklos Szeredi --- fs/fuse/dir.c | 36 ++++++++++++++++++++++++++++++------ 1 file changed, 30 insertions(+), 6 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index ba0a175d7578..58557d4817e9 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -24,11 +24,34 @@ static void fuse_advise_use_readdirplus(struct inode *dir) set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state); } +#if BITS_PER_LONG >= 64 +static inline void __fuse_dentry_settime(struct dentry *entry, u64 time) +{ + entry->d_fsdata = (void *) time; +} + +static inline u64 fuse_dentry_time(const struct dentry *entry) +{ + return (u64)entry->d_fsdata; +} + +#else union fuse_dentry { u64 time; struct rcu_head rcu; }; +static inline void __fuse_dentry_settime(struct dentry *dentry, u64 time) +{ + ((union fuse_dentry *) dentry->d_fsdata)->time = time; +} + +static inline u64 fuse_dentry_time(const struct dentry *entry) +{ + return ((union fuse_dentry *) entry->d_fsdata)->time; +} +#endif + static void fuse_dentry_settime(struct dentry *dentry, u64 time) { struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb); @@ -47,12 +70,7 @@ static void fuse_dentry_settime(struct dentry *dentry, u64 time) spin_unlock(&dentry->d_lock); } - ((union fuse_dentry *) dentry->d_fsdata)->time = time; -} - -static inline u64 fuse_dentry_time(const struct dentry *entry) -{ - return ((union fuse_dentry *) entry->d_fsdata)->time; + __fuse_dentry_settime(dentry, time); } /* @@ -258,6 +276,7 @@ invalid: goto out; } +#if BITS_PER_LONG < 64 static int fuse_dentry_init(struct dentry *dentry) { dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL); @@ -270,6 +289,7 @@ static void fuse_dentry_release(struct dentry *dentry) kfree_rcu(fd, rcu); } +#endif static int fuse_dentry_delete(const struct dentry *dentry) { @@ -279,13 +299,17 @@ static int fuse_dentry_delete(const struct dentry *dentry) const struct dentry_operations fuse_dentry_operations = { .d_revalidate = fuse_dentry_revalidate, .d_delete = fuse_dentry_delete, +#if BITS_PER_LONG < 64 .d_init = fuse_dentry_init, .d_release = fuse_dentry_release, +#endif }; const struct dentry_operations fuse_root_dentry_operations = { +#if BITS_PER_LONG < 64 .d_init = fuse_dentry_init, .d_release = fuse_dentry_release, +#endif }; int fuse_valid_type(int m) -- cgit v1.2.3