Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull more vfs updates from Al Viro:
 "Assorted VFS fixes and related cleanups (IMO the most interesting in
  that part are f_path-related things and Eric's descriptor-related
  stuff).  UFS regression fixes (it got broken last cycle).  9P fixes.
  fs-cache series, DAX patches, Jan's file_remove_suid() work"

[ I'd say this is much more than "fixes and related cleanups".  The
  file_table locking rule change by Eric Dumazet is a rather big and
  fundamental update even if the patch isn't huge.   - Linus ]

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (49 commits)
  9p: cope with bogus responses from server in p9_client_{read,write}
  p9_client_write(): avoid double p9_free_req()
  9p: forgetting to cancel request on interrupted zero-copy RPC
  dax: bdev_direct_access() may sleep
  block: Add support for DAX reads/writes to block devices
  dax: Use copy_from_iter_nocache
  dax: Add block size note to documentation
  fs/file.c: __fget() and dup2() atomicity rules
  fs/file.c: don't acquire files->file_lock in fd_install()
  fs:super:get_anon_bdev: fix race condition could cause dev exceed its upper limitation
  vfs: avoid creation of inode number 0 in get_next_ino
  namei: make set_root_rcu() return void
  make simple_positive() public
  ufs: use dir_pages instead of ufs_dir_pages()
  pagemap.h: move dir_pages() over there
  remove the pointless include of lglock.h
  fs: cleanup slight list_entry abuse
  xfs: Correctly lock inode when removing suid and file capabilities
  fs: Call security_ops->inode_killpriv on truncate
  fs: Provide function telling whether file_remove_privs() will do anything
  ...

6 files changed, 52 insertions, 31 deletions

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index df334cbacc6d..d2d50249b7b2 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -160,6 +160,7 @@ struct dentry_operations {
         char *(*d_dname)(struct dentry *, char *, int);
         struct vfsmount *(*d_automount)(struct path *);
         int (*d_manage)(struct dentry *, bool);
+        struct inode *(*d_select_inode)(struct dentry *, unsigned);
 } ____cacheline_aligned;
 
 /*
@@ -225,6 +226,7 @@ struct dentry_operations {
 
 #define DCACHE_MAY_FREE                 0x00800000
 #define DCACHE_FALLTHRU                 0x01000000 /* Fall through to lower layer */
+#define DCACHE_OP_SELECT_INODE          0x02000000 /* Unioned entry: dcache op selects inode */
 
 extern seqlock_t rename_lock;
 
@@ -505,6 +507,11 @@ static inline bool d_really_is_positive(const struct dentry *dentry)
         return dentry->d_inode != NULL;
 }
 
+static inline int simple_positive(struct dentry *dentry)
+{
+        return d_really_is_positive(dentry) && !d_unhashed(dentry);
+}
+
 extern void d_set_fallthru(struct dentry *dentry);
 
 static inline bool d_is_fallthru(const struct dentry *dentry)
diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
index 230f87bdf5ad..fbb88740634a 100644
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -47,6 +47,9 @@ struct files_struct {
    * read mostly part
    */
         atomic_t count;
+        bool resize_in_progress;
+        wait_queue_head_t resize_wait;
+
         struct fdtable __rcu *fdt;
         struct fdtable fdtab;
   /*
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8a81fcbb0074..a0653e560c26 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1654,7 +1654,6 @@ struct inode_operations {
         int (*set_acl)(struct inode *, struct posix_acl *, int);
 
         /* WARNING: probably going away soon, do not use! */
-        int (*dentry_open)(struct dentry *, struct file *, const struct cred *);
 } ____cacheline_aligned;
 
 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
@@ -2213,7 +2212,6 @@ extern struct file *file_open_name(struct filename *, int, umode_t);
 extern struct file *filp_open(const char *, int, umode_t);
 extern struct file *file_open_root(struct dentry *, struct vfsmount *,
                                    const char *, int);
-extern int vfs_open(const struct path *, struct file *, const struct cred *);
 extern struct file * dentry_open(const struct path *, int, const struct cred *);
 extern int filp_close(struct file *, fl_owner_t id);
 
@@ -2530,6 +2528,8 @@ extern struct file * open_exec(const char *);
 extern int is_subdir(struct dentry *, struct dentry *);
 extern int path_is_under(struct path *, struct path *);
 
+extern char *file_path(struct file *, char *, int);
+
 #include <linux/err.h>
 
 /* needed for stackable file system support */
@@ -2581,7 +2581,12 @@ extern struct inode *new_inode_pseudo(struct super_block *sb);
 extern struct inode *new_inode(struct super_block *sb);
 extern void free_inode_nonrcu(struct inode *inode);
 extern int should_remove_suid(struct dentry *);
-extern int file_remove_suid(struct file *);
+extern int file_remove_privs(struct file *);
+extern int dentry_needs_remove_privs(struct dentry *dentry);
+static inline int file_needs_remove_privs(struct file *file)
+{
+        return dentry_needs_remove_privs(file->f_path.dentry);
+}
 
 extern void __insert_inode_hash(struct inode *, unsigned long hashval);
 static inline void insert_inode_hash(struct inode *inode)
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 771484993ca7..604e1526cd00 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -74,6 +74,7 @@ extern wait_queue_head_t fscache_cache_cleared_wq;
  */
 typedef void (*fscache_operation_release_t)(struct fscache_operation *op);
 typedef void (*fscache_operation_processor_t)(struct fscache_operation *op);
+typedef void (*fscache_operation_cancel_t)(struct fscache_operation *op);
 
 enum fscache_operation_state {
         FSCACHE_OP_ST_BLANK,            /* Op is not yet submitted */
@@ -109,6 +110,9 @@ struct fscache_operation {
          *   the op in a non-pool thread */
         fscache_operation_processor_t processor;
 
+        /* Operation cancellation cleanup (optional) */
+        fscache_operation_cancel_t cancel;
+
         /* operation releaser */
         fscache_operation_release_t release;
 };
@@ -119,33 +123,17 @@ extern void fscache_op_work_func(struct work_struct *work);
 extern void fscache_enqueue_operation(struct fscache_operation *);
 extern void fscache_op_complete(struct fscache_operation *, bool);
 extern void fscache_put_operation(struct fscache_operation *);
-
-/**
- * fscache_operation_init - Do basic initialisation of an operation
- * @op: The operation to initialise
- * @release: The release function to assign
- *
- * Do basic initialisation of an operation.  The caller must still set flags,
- * object and processor if needed.
- */
-static inline void fscache_operation_init(struct fscache_operation *op,
-                                        fscache_operation_processor_t processor,
-                                        fscache_operation_release_t release)
-{
-        INIT_WORK(&op->work, fscache_op_work_func);
-        atomic_set(&op->usage, 1);
-        op->state = FSCACHE_OP_ST_INITIALISED;
-        op->debug_id = atomic_inc_return(&fscache_op_debug_id);
-        op->processor = processor;
-        op->release = release;
-        INIT_LIST_HEAD(&op->pend_link);
-}
+extern void fscache_operation_init(struct fscache_operation *,
+                                   fscache_operation_processor_t,
+                                   fscache_operation_cancel_t,
+                                   fscache_operation_release_t);
 
 /*
  * data read operation
  */
 struct fscache_retrieval {
         struct fscache_operation op;
+        struct fscache_cookie   *cookie;        /* The netfs cookie */
         struct address_space    *mapping;       /* netfs pages */
         fscache_rw_complete_t   end_io_func;    /* function to call on I/O completion */
         void                    *context;       /* netfs read context (pinned) */
@@ -371,6 +359,7 @@ struct fscache_object {
 #define FSCACHE_OBJECT_IS_LOOKED_UP     4       /* T if object has been looked up */
 #define FSCACHE_OBJECT_IS_AVAILABLE     5       /* T if object has become active */
 #define FSCACHE_OBJECT_RETIRED          6       /* T if object was retired on relinquishment */
+#define FSCACHE_OBJECT_KILLED_BY_CACHE  7       /* T if object was killed by the cache */
 
         struct list_head        cache_link;     /* link in cache->object_list */
         struct hlist_node       cookie_link;    /* link in cookie->backing_objects */
@@ -410,17 +399,16 @@ static inline bool fscache_object_is_available(struct fscache_object *object)
         return test_bit(FSCACHE_OBJECT_IS_AVAILABLE, &object->flags);
 }
 
-static inline bool fscache_object_is_active(struct fscache_object *object)
+static inline bool fscache_cache_is_broken(struct fscache_object *object)
 {
-        return fscache_object_is_available(object) &&
-                fscache_object_is_live(object) &&
-                !test_bit(FSCACHE_IOERROR, &object->cache->flags);
+        return test_bit(FSCACHE_IOERROR, &object->cache->flags);
 }
 
-static inline bool fscache_object_is_dead(struct fscache_object *object)
+static inline bool fscache_object_is_active(struct fscache_object *object)
 {
-        return fscache_object_is_dying(object) &&
-                test_bit(FSCACHE_IOERROR, &object->cache->flags);
+        return fscache_object_is_available(object) &&
+                fscache_object_is_live(object) &&
+                !fscache_cache_is_broken(object);
 }
 
 /**
@@ -551,4 +539,15 @@ extern enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
                                                const void *data,
                                                uint16_t datalen);
 
+extern void fscache_object_retrying_stale(struct fscache_object *object);
+
+enum fscache_why_object_killed {
+        FSCACHE_OBJECT_IS_STALE,
+        FSCACHE_OBJECT_NO_SPACE,
+        FSCACHE_OBJECT_WAS_RETIRED,
+        FSCACHE_OBJECT_WAS_CULLED,
+};
+extern void fscache_object_mark_killed(struct fscache_object *object,
+                                       enum fscache_why_object_killed why);
+
 #endif /* _LINUX_FSCACHE_CACHE_H */
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index fb0814ca65c7..a6c78e00ea96 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -671,4 +671,10 @@ static inline int add_to_page_cache(struct page *page,
         return error;
 }
 
+static inline unsigned long dir_pages(struct inode *inode)
+{
+        return (unsigned long)(inode->i_size + PAGE_CACHE_SIZE - 1) >>
+                               PAGE_CACHE_SHIFT;
+}
+
 #endif /* _LINUX_PAGEMAP_H */
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index afbb1fd77c77..912a7c482649 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -123,6 +123,7 @@ __printf(2, 3) int seq_printf(struct seq_file *, const char *, ...);
 __printf(2, 0) int seq_vprintf(struct seq_file *, const char *, va_list args);
 
 int seq_path(struct seq_file *, const struct path *, const char *);
+int seq_file_path(struct seq_file *, struct file *, const char *);
 int seq_dentry(struct seq_file *, struct dentry *, const char *);
 int seq_path_root(struct seq_file *m, const struct path *path,
                   const struct path *root, const char *esc);