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fuse: reduce size of struct fuse_inode 

Do this by grouping fields used for cached writes and putting them into a
union with fileds used for cached readdir (with obviously no overlap, since
we don't have hybrid objects).

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2018-10-01 10:07:05 +02:00
parent 261aaba72f
commit ab2257e994
4 changed files with 58 additions and 41 deletions
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13
fs/fuse/dir.c
View File

@ -1414,8 +1414,11 @@ int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
file = NULL;
}
if (attr->ia_valid & ATTR_SIZE)
if (attr->ia_valid & ATTR_SIZE) {
if (WARN_ON(!S_ISREG(inode->i_mode)))
return -EIO;
is_truncate = true;
}
if (is_truncate) {
fuse_set_nowrite(inode);
@ -1619,8 +1622,16 @@ void fuse_init_common(struct inode *inode)
void fuse_init_dir(struct inode *inode)
{
struct fuse_inode *fi = get_fuse_inode(inode);
inode->i_op = &fuse_dir_inode_operations;
inode->i_fop = &fuse_dir_operations;
spin_lock_init(&fi->rdc.lock);
fi->rdc.cached = false;
fi->rdc.size = 0;
fi->rdc.pos = 0;
fi->rdc.version = 0;
}
void fuse_init_symlink(struct inode *inode)

8
fs/fuse/file.c
View File

@ -3143,6 +3143,14 @@ static const struct address_space_operations fuse_file_aops = {
void fuse_init_file_inode(struct inode *inode)
{
struct fuse_inode *fi = get_fuse_inode(inode);
inode->i_fop = &fuse_file_operations;
inode->i_data.a_ops = &fuse_file_aops;
INIT_LIST_HEAD(&fi->write_files);
INIT_LIST_HEAD(&fi->queued_writes);
fi->writectr = 0;
init_waitqueue_head(&fi->page_waitq);
INIT_LIST_HEAD(&fi->writepages);
}

62
fs/fuse/fuse_i.h
View File

@ -87,45 +87,51 @@ struct fuse_inode {
/** Version of last attribute change */
u64 attr_version;
/** Files usable in writepage. Protected by fc->lock */
struct list_head write_files;
union {
/* Write related fields (regular file only) */
struct {
/* Files usable in writepage. Protected by fc->lock */
struct list_head write_files;
/** Writepages pending on truncate or fsync */
struct list_head queued_writes;
/* Writepages pending on truncate or fsync */
struct list_head queued_writes;
/** Number of sent writes, a negative bias (FUSE_NOWRITE)
* means more writes are blocked */
int writectr;
/* Number of sent writes, a negative bias
* (FUSE_NOWRITE) means more writes are blocked */
int writectr;
/** Waitq for writepage completion */
wait_queue_head_t page_waitq;
/* Waitq for writepage completion */
wait_queue_head_t page_waitq;
/** List of writepage requestst (pending or sent) */
struct list_head writepages;
/* List of writepage requestst (pending or sent) */
struct list_head writepages;
};
/* readdir cache */
struct {
/* true if fully cached */
bool cached;
/* readdir cache (directory only) */
struct {
/* true if fully cached */
bool cached;
/* size of cache */
loff_t size;
/* size of cache */
loff_t size;
/* position at end of cache (position of next entry) */
loff_t pos;
/* position at end of cache (position of next entry) */
loff_t pos;
/* version of the cache */
u64 version;
/* version of the cache */
u64 version;
/* modification time of directory when cache was started */
struct timespec64 mtime;
/* modification time of directory when cache was
* started */
struct timespec64 mtime;
/* iversion of directory when cache was started */
u64 iversion;
/* iversion of directory when cache was started */
u64 iversion;
/* protects above fields */
spinlock_t lock;
} rdc;
/* protects above fields */
spinlock_t lock;
} rdc;
};
/** Miscellaneous bits describing inode state */
unsigned long state;

16
fs/fuse/inode.c
View File

@ -93,18 +93,8 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
fi->nodeid = 0;
fi->nlookup = 0;
fi->attr_version = 0;
fi->writectr = 0;
fi->orig_ino = 0;
fi->state = 0;
INIT_LIST_HEAD(&fi->write_files);
INIT_LIST_HEAD(&fi->queued_writes);
INIT_LIST_HEAD(&fi->writepages);
init_waitqueue_head(&fi->page_waitq);
spin_lock_init(&fi->rdc.lock);
fi->rdc.cached = false;
fi->rdc.size = 0;
fi->rdc.pos = 0;
fi->rdc.version = 0;
mutex_init(&fi->mutex);
fi->forget = fuse_alloc_forget();
if (!fi->forget) {
@ -124,8 +114,10 @@ static void fuse_i_callback(struct rcu_head *head)
static void fuse_destroy_inode(struct inode *inode)
{
struct fuse_inode *fi = get_fuse_inode(inode);
BUG_ON(!list_empty(&fi->write_files));
BUG_ON(!list_empty(&fi->queued_writes));
if (S_ISREG(inode->i_mode)) {
WARN_ON(!list_empty(&fi->write_files));
WARN_ON(!list_empty(&fi->queued_writes));
}
mutex_destroy(&fi->mutex);
kfree(fi->forget);
call_rcu(&inode->i_rcu, fuse_i_callback);