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-rw-r--r--include/linux/dcache.h579
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diff --git a/include/linux/dcache.h b/include/linux/dcache.h
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--- /dev/null
+++ b/include/linux/dcache.h
@@ -0,0 +1,579 @@
+#ifndef __LINUX_DCACHE_H
+#define __LINUX_DCACHE_H
+
+#include <linux/atomic.h>
+#include <linux/list.h>
+#include <linux/rculist.h>
+#include <linux/rculist_bl.h>
+#include <linux/spinlock.h>
+#include <linux/seqlock.h>
+#include <linux/cache.h>
+#include <linux/rcupdate.h>
+#include <linux/lockref.h>
+
+struct path;
+struct vfsmount;
+
+/*
+ * linux/include/linux/dcache.h
+ *
+ * Dirent cache data structures
+ *
+ * (C) Copyright 1997 Thomas Schoebel-Theuer,
+ * with heavy changes by Linus Torvalds
+ */
+
+#define IS_ROOT(x) ((x) == (x)->d_parent)
+
+/* The hash is always the low bits of hash_len */
+#ifdef __LITTLE_ENDIAN
+ #define HASH_LEN_DECLARE u32 hash; u32 len;
+ #define bytemask_from_count(cnt) (~(~0ul << (cnt)*8))
+#else
+ #define HASH_LEN_DECLARE u32 len; u32 hash;
+ #define bytemask_from_count(cnt) (~(~0ul >> (cnt)*8))
+#endif
+
+/*
+ * "quick string" -- eases parameter passing, but more importantly
+ * saves "metadata" about the string (ie length and the hash).
+ *
+ * hash comes first so it snuggles against d_parent in the
+ * dentry.
+ */
+struct qstr {
+ union {
+ struct {
+ HASH_LEN_DECLARE;
+ };
+ u64 hash_len;
+ };
+ const unsigned char *name;
+};
+
+#define QSTR_INIT(n,l) { { { .len = l } }, .name = n }
+#define hashlen_hash(hashlen) ((u32) (hashlen))
+#define hashlen_len(hashlen) ((u32)((hashlen) >> 32))
+#define hashlen_create(hash,len) (((u64)(len)<<32)|(u32)(hash))
+
+struct dentry_stat_t {
+ long nr_dentry;
+ long nr_unused;
+ long age_limit; /* age in seconds */
+ long want_pages; /* pages requested by system */
+ long dummy[2];
+};
+extern struct dentry_stat_t dentry_stat;
+
+/* Name hashing routines. Initial hash value */
+/* Hash courtesy of the R5 hash in reiserfs modulo sign bits */
+#define init_name_hash() 0
+
+/* partial hash update function. Assume roughly 4 bits per character */
+static inline unsigned long
+partial_name_hash(unsigned long c, unsigned long prevhash)
+{
+ return (prevhash + (c << 4) + (c >> 4)) * 11;
+}
+
+/*
+ * Finally: cut down the number of bits to a int value (and try to avoid
+ * losing bits)
+ */
+static inline unsigned long end_name_hash(unsigned long hash)
+{
+ return (unsigned int) hash;
+}
+
+/* Compute the hash for a name string. */
+extern unsigned int full_name_hash(const unsigned char *, unsigned int);
+
+/*
+ * Try to keep struct dentry aligned on 64 byte cachelines (this will
+ * give reasonable cacheline footprint with larger lines without the
+ * large memory footprint increase).
+ */
+#ifdef CONFIG_64BIT
+# define DNAME_INLINE_LEN 32 /* 192 bytes */
+#else
+# ifdef CONFIG_SMP
+# define DNAME_INLINE_LEN 36 /* 128 bytes */
+# else
+# define DNAME_INLINE_LEN 40 /* 128 bytes */
+# endif
+#endif
+
+#define d_lock d_lockref.lock
+
+struct dentry {
+ /* RCU lookup touched fields */
+ unsigned int d_flags; /* protected by d_lock */
+ seqcount_t d_seq; /* per dentry seqlock */
+ struct hlist_bl_node d_hash; /* lookup hash list */
+ struct dentry *d_parent; /* parent directory */
+ struct qstr d_name;
+ struct inode *d_inode; /* Where the name belongs to - NULL is
+ * negative */
+ unsigned char d_iname[DNAME_INLINE_LEN]; /* small names */
+
+ /* Ref lookup also touches following */
+ struct lockref d_lockref; /* per-dentry lock and refcount */
+ const struct dentry_operations *d_op;
+ struct super_block *d_sb; /* The root of the dentry tree */
+ unsigned long d_time; /* used by d_revalidate */
+ void *d_fsdata; /* fs-specific data */
+
+ struct list_head d_lru; /* LRU list */
+ struct list_head d_child; /* child of parent list */
+ struct list_head d_subdirs; /* our children */
+ /*
+ * d_alias and d_rcu can share memory
+ */
+ union {
+ struct hlist_node d_alias; /* inode alias list */
+ struct rcu_head d_rcu;
+ } d_u;
+};
+
+/*
+ * dentry->d_lock spinlock nesting subclasses:
+ *
+ * 0: normal
+ * 1: nested
+ */
+enum dentry_d_lock_class
+{
+ DENTRY_D_LOCK_NORMAL, /* implicitly used by plain spin_lock() APIs. */
+ DENTRY_D_LOCK_NESTED
+};
+
+struct dentry_operations {
+ int (*d_revalidate)(struct dentry *, unsigned int);
+ int (*d_weak_revalidate)(struct dentry *, unsigned int);
+ int (*d_hash)(const struct dentry *, struct qstr *);
+ int (*d_compare)(const struct dentry *, const struct dentry *,
+ 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 *);
+ int (*d_manage)(struct dentry *, bool);
+} ____cacheline_aligned;
+
+/*
+ * Locking rules for dentry_operations callbacks are to be found in
+ * Documentation/filesystems/Locking. Keep it updated!
+ *
+ * FUrther descriptions are found in Documentation/filesystems/vfs.txt.
+ * Keep it updated too!
+ */
+
+/* d_flags entries */
+#define DCACHE_OP_HASH 0x00000001
+#define DCACHE_OP_COMPARE 0x00000002
+#define DCACHE_OP_REVALIDATE 0x00000004
+#define DCACHE_OP_DELETE 0x00000008
+#define DCACHE_OP_PRUNE 0x00000010
+
+#define DCACHE_DISCONNECTED 0x00000020
+ /* 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
+ * endeavour to clear the bit either by discovering that it is connected,
+ * or by performing lookup operations. Any filesystem which supports
+ * nfsd_operations MUST have a lookup function which, if it finds a
+ * directory inode with a DCACHE_DISCONNECTED dentry, will d_move that
+ * dentry into place and return that dentry rather than the passed one,
+ * typically using d_splice_alias. */
+
+#define DCACHE_REFERENCED 0x00000040 /* Recently used, don't discard. */
+#define DCACHE_RCUACCESS 0x00000080 /* Entry has ever been RCU-visible */
+
+#define DCACHE_CANT_MOUNT 0x00000100
+#define DCACHE_GENOCIDE 0x00000200
+#define DCACHE_SHRINK_LIST 0x00000400
+
+#define DCACHE_OP_WEAK_REVALIDATE 0x00000800
+
+#define DCACHE_NFSFS_RENAMED 0x00001000
+ /* this dentry has been "silly renamed" and has to be deleted on the last
+ * dput() */
+#define DCACHE_COOKIE 0x00002000 /* For use by dcookie subsystem */
+#define DCACHE_FSNOTIFY_PARENT_WATCHED 0x00004000
+ /* Parent inode is watched by some fsnotify listener */
+
+#define DCACHE_DENTRY_KILLED 0x00008000
+
+#define DCACHE_MOUNTED 0x00010000 /* is a mountpoint */
+#define DCACHE_NEED_AUTOMOUNT 0x00020000 /* handle automount on this dir */
+#define DCACHE_MANAGE_TRANSIT 0x00040000 /* manage transit from this dirent */
+#define DCACHE_MANAGED_DENTRY \
+ (DCACHE_MOUNTED|DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT)
+
+#define DCACHE_LRU_LIST 0x00080000
+
+#define DCACHE_ENTRY_TYPE 0x00700000
+#define DCACHE_MISS_TYPE 0x00000000 /* Negative dentry (maybe fallthru to nowhere) */
+#define DCACHE_WHITEOUT_TYPE 0x00100000 /* Whiteout dentry (stop pathwalk) */
+#define DCACHE_DIRECTORY_TYPE 0x00200000 /* Normal directory */
+#define DCACHE_AUTODIR_TYPE 0x00300000 /* Lookupless directory (presumed automount) */
+#define DCACHE_REGULAR_TYPE 0x00400000 /* Regular file type (or fallthru to such) */
+#define DCACHE_SPECIAL_TYPE 0x00500000 /* Other file type (or fallthru to such) */
+#define DCACHE_SYMLINK_TYPE 0x00600000 /* Symlink (or fallthru to such) */
+
+#define DCACHE_MAY_FREE 0x00800000
+#define DCACHE_FALLTHRU 0x01000000 /* Fall through to lower layer */
+
+extern seqlock_t rename_lock;
+
+/*
+ * These are the low-level FS interfaces to the dcache..
+ */
+extern void d_instantiate(struct dentry *, struct inode *);
+extern struct dentry * d_instantiate_unique(struct dentry *, struct inode *);
+extern int d_instantiate_no_diralias(struct dentry *, struct inode *);
+extern void __d_drop(struct dentry *dentry);
+extern void d_drop(struct dentry *dentry);
+extern void d_delete(struct dentry *);
+extern void d_set_d_op(struct dentry *dentry, const struct dentry_operations *op);
+
+/* allocate/de-allocate */
+extern struct dentry * d_alloc(struct dentry *, const struct qstr *);
+extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
+extern struct dentry * d_splice_alias(struct inode *, struct dentry *);
+extern struct dentry * d_add_ci(struct dentry *, struct inode *, struct qstr *);
+extern struct dentry *d_find_any_alias(struct inode *inode);
+extern struct dentry * d_obtain_alias(struct inode *);
+extern struct dentry * d_obtain_root(struct inode *);
+extern void shrink_dcache_sb(struct super_block *);
+extern void shrink_dcache_parent(struct dentry *);
+extern void shrink_dcache_for_umount(struct super_block *);
+extern void d_invalidate(struct dentry *);
+
+/* only used at mount-time */
+extern struct dentry * d_make_root(struct inode *);
+
+/* <clickety>-<click> the ramfs-type tree */
+extern void d_genocide(struct dentry *);
+
+extern void d_tmpfile(struct dentry *, struct inode *);
+
+extern struct dentry *d_find_alias(struct inode *);
+extern void d_prune_aliases(struct inode *);
+
+/* test whether we have any submounts in a subdir tree */
+extern int have_submounts(struct dentry *);
+
+/*
+ * This adds the entry to the hash queues.
+ */
+extern void d_rehash(struct dentry *);
+
+/**
+ * d_add - add dentry to hash queues
+ * @entry: dentry to add
+ * @inode: The inode to attach to this dentry
+ *
+ * This adds the entry to the hash queues and initializes @inode.
+ * The entry was actually filled in earlier during d_alloc().
+ */
+
+static inline void d_add(struct dentry *entry, struct inode *inode)
+{
+ d_instantiate(entry, inode);
+ d_rehash(entry);
+}
+
+/**
+ * d_add_unique - add dentry to hash queues without aliasing
+ * @entry: dentry to add
+ * @inode: The inode to attach to this dentry
+ *
+ * This adds the entry to the hash queues and initializes @inode.
+ * The entry was actually filled in earlier during d_alloc().
+ */
+static inline struct dentry *d_add_unique(struct dentry *entry, struct inode *inode)
+{
+ struct dentry *res;
+
+ res = d_instantiate_unique(entry, inode);
+ d_rehash(res != NULL ? res : entry);
+ return res;
+}
+
+extern void dentry_update_name_case(struct dentry *, struct qstr *);
+
+/* used for rename() and baskets */
+extern void d_move(struct dentry *, struct dentry *);
+extern void d_exchange(struct dentry *, struct dentry *);
+extern struct dentry *d_ancestor(struct dentry *, struct dentry *);
+
+/* appendix may either be NULL or be used for transname suffixes */
+extern struct dentry *d_lookup(const struct dentry *, const struct qstr *);
+extern struct dentry *d_hash_and_lookup(struct dentry *, struct qstr *);
+extern struct dentry *__d_lookup(const struct dentry *, const struct qstr *);
+extern struct dentry *__d_lookup_rcu(const struct dentry *parent,
+ const struct qstr *name, unsigned *seq);
+
+static inline unsigned d_count(const struct dentry *dentry)
+{
+ return dentry->d_lockref.count;
+}
+
+/*
+ * helper function for dentry_operations.d_dname() members
+ */
+extern char *dynamic_dname(struct dentry *, char *, int, const char *, ...);
+extern char *simple_dname(struct dentry *, char *, int);
+
+extern char *__d_path(const struct path *, const struct path *, char *, int);
+extern char *d_absolute_path(const struct path *, char *, int);
+extern char *d_path(const struct path *, char *, int);
+extern char *dentry_path_raw(struct dentry *, char *, int);
+extern char *dentry_path(struct dentry *, char *, int);
+
+/* Allocation counts.. */
+
+/**
+ * dget, dget_dlock - get a reference to a dentry
+ * @dentry: dentry to get a reference to
+ *
+ * Given a dentry or %NULL pointer increment the reference count
+ * if appropriate and return the dentry. A dentry will not be
+ * destroyed when it has references.
+ */
+static inline struct dentry *dget_dlock(struct dentry *dentry)
+{
+ if (dentry)
+ dentry->d_lockref.count++;
+ return dentry;
+}
+
+static inline struct dentry *dget(struct dentry *dentry)
+{
+ if (dentry)
+ lockref_get(&dentry->d_lockref);
+ return dentry;
+}
+
+extern struct dentry *dget_parent(struct dentry *dentry);
+
+/**
+ * d_unhashed - is dentry hashed
+ * @dentry: entry to check
+ *
+ * Returns true if the dentry passed is not currently hashed.
+ */
+
+static inline int d_unhashed(const struct dentry *dentry)
+{
+ return hlist_bl_unhashed(&dentry->d_hash);
+}
+
+static inline int d_unlinked(const struct dentry *dentry)
+{
+ return d_unhashed(dentry) && !IS_ROOT(dentry);
+}
+
+static inline int cant_mount(const struct dentry *dentry)
+{
+ return (dentry->d_flags & DCACHE_CANT_MOUNT);
+}
+
+static inline void dont_mount(struct dentry *dentry)
+{
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags |= DCACHE_CANT_MOUNT;
+ spin_unlock(&dentry->d_lock);
+}
+
+extern void dput(struct dentry *);
+
+static inline bool d_managed(const struct dentry *dentry)
+{
+ return dentry->d_flags & DCACHE_MANAGED_DENTRY;
+}
+
+static inline bool d_mountpoint(const struct dentry *dentry)
+{
+ return dentry->d_flags & DCACHE_MOUNTED;
+}
+
+/*
+ * Directory cache entry type accessor functions.
+ */
+static inline unsigned __d_entry_type(const struct dentry *dentry)
+{
+ unsigned type = READ_ONCE(dentry->d_flags);
+ smp_rmb();
+ return type & DCACHE_ENTRY_TYPE;
+}
+
+static inline bool d_is_miss(const struct dentry *dentry)
+{
+ return __d_entry_type(dentry) == DCACHE_MISS_TYPE;
+}
+
+static inline bool d_is_whiteout(const struct dentry *dentry)
+{
+ return __d_entry_type(dentry) == DCACHE_WHITEOUT_TYPE;
+}
+
+static inline bool d_can_lookup(const struct dentry *dentry)
+{
+ return __d_entry_type(dentry) == DCACHE_DIRECTORY_TYPE;
+}
+
+static inline bool d_is_autodir(const struct dentry *dentry)
+{
+ return __d_entry_type(dentry) == DCACHE_AUTODIR_TYPE;
+}
+
+static inline bool d_is_dir(const struct dentry *dentry)
+{
+ return d_can_lookup(dentry) || d_is_autodir(dentry);
+}
+
+static inline bool d_is_symlink(const struct dentry *dentry)
+{
+ return __d_entry_type(dentry) == DCACHE_SYMLINK_TYPE;
+}
+
+static inline bool d_is_reg(const struct dentry *dentry)
+{
+ return __d_entry_type(dentry) == DCACHE_REGULAR_TYPE;
+}
+
+static inline bool d_is_special(const struct dentry *dentry)
+{
+ return __d_entry_type(dentry) == DCACHE_SPECIAL_TYPE;
+}
+
+static inline bool d_is_file(const struct dentry *dentry)
+{
+ return d_is_reg(dentry) || d_is_special(dentry);
+}
+
+static inline bool d_is_negative(const struct dentry *dentry)
+{
+ // TODO: check d_is_whiteout(dentry) also.
+ return d_is_miss(dentry);
+}
+
+static inline bool d_is_positive(const struct dentry *dentry)
+{
+ return !d_is_negative(dentry);
+}
+
+/**
+ * d_really_is_negative - Determine if a dentry is really negative (ignoring fallthroughs)
+ * @dentry: The dentry in question
+ *
+ * Returns true if the dentry represents either an absent name or a name that
+ * doesn't map to an inode (ie. ->d_inode is NULL). The dentry could represent
+ * a true miss, a whiteout that isn't represented by a 0,0 chardev or a
+ * fallthrough marker in an opaque directory.
+ *
+ * Note! (1) This should be used *only* by a filesystem to examine its own
+ * dentries. It should not be used to look at some other filesystem's
+ * dentries. (2) It should also be used in combination with d_inode() to get
+ * the inode. (3) The dentry may have something attached to ->d_lower and the
+ * type field of the flags may be set to something other than miss or whiteout.
+ */
+static inline bool d_really_is_negative(const struct dentry *dentry)
+{
+ return dentry->d_inode == NULL;
+}
+
+/**
+ * d_really_is_positive - Determine if a dentry is really positive (ignoring fallthroughs)
+ * @dentry: The dentry in question
+ *
+ * Returns true if the dentry represents a name that maps to an inode
+ * (ie. ->d_inode is not NULL). The dentry might still represent a whiteout if
+ * that is represented on medium as a 0,0 chardev.
+ *
+ * Note! (1) This should be used *only* by a filesystem to examine its own
+ * dentries. It should not be used to look at some other filesystem's
+ * dentries. (2) It should also be used in combination with d_inode() to get
+ * the inode.
+ */
+static inline bool d_really_is_positive(const struct dentry *dentry)
+{
+ return dentry->d_inode != NULL;
+}
+
+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)
+{
+ return mult_frac(val, sysctl_vfs_cache_pressure, 100);
+}
+
+/**
+ * d_inode - Get the actual inode of this dentry
+ * @dentry: The dentry to query
+ *
+ * This is the helper normal filesystems should use to get at their own inodes
+ * in their own dentries and ignore the layering superimposed upon them.
+ */
+static inline struct inode *d_inode(const struct dentry *dentry)
+{
+ return dentry->d_inode;
+}
+
+/**
+ * d_inode_rcu - Get the actual inode of this dentry with ACCESS_ONCE()
+ * @dentry: The dentry to query
+ *
+ * This is the helper normal filesystems should use to get at their own inodes
+ * in their own dentries and ignore the layering superimposed upon them.
+ */
+static inline struct inode *d_inode_rcu(const struct dentry *dentry)
+{
+ return ACCESS_ONCE(dentry->d_inode);
+}
+
+/**
+ * d_backing_inode - Get upper or lower inode we should be using
+ * @upper: The upper layer
+ *
+ * This is the helper that should be used to get at the inode that will be used
+ * if this dentry were to be opened as a file. The inode may be on the upper
+ * dentry or it may be on a lower dentry pinned by the upper.
+ *
+ * Normal filesystems should not use this to access their own inodes.
+ */
+static inline struct inode *d_backing_inode(const struct dentry *upper)
+{
+ struct inode *inode = upper->d_inode;
+
+ return inode;
+}
+
+/**
+ * d_backing_dentry - Get upper or lower dentry we should be using
+ * @upper: The upper layer
+ *
+ * This is the helper that should be used to get the dentry of the inode that
+ * will be used if this dentry were opened as a file. It may be the upper
+ * dentry or it may be a lower dentry pinned by the upper.
+ *
+ * Normal filesystems should not use this to access their own dentries.
+ */
+static inline struct dentry *d_backing_dentry(struct dentry *upper)
+{
+ return upper;
+}
+
+#endif /* __LINUX_DCACHE_H */