1 files changed, 77 insertions, 25 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 42efe13077b6..ec0f1dc66b9b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -34,6 +34,7 @@
 #include <asm/byteorder.h>
 #include <uapi/linux/fs.h>
 
+struct backing_dev_info;
 struct export_operations;
 struct hd_geometry;
 struct iovec;
@@ -394,14 +395,12 @@ int pagecache_write_end(struct file *, struct address_space *mapping,
                                 loff_t pos, unsigned len, unsigned copied,
                                 struct page *page, void *fsdata);
 
-struct backing_dev_info;
 struct address_space {
         struct inode            *host;          /* owner: inode, block_device */
         struct radix_tree_root  page_tree;      /* radix tree of all pages */
         spinlock_t              tree_lock;      /* and lock protecting it */
         atomic_t                i_mmap_writable;/* count VM_SHARED mappings */
         struct rb_root          i_mmap;         /* tree of private and shared mappings */
-        struct list_head        i_mmap_nonlinear;/*list VM_NONLINEAR mappings */
         struct rw_semaphore     i_mmap_rwsem;   /* protect tree, count, list */
         /* Protected by tree_lock together with the radix tree */
         unsigned long           nrpages;        /* number of total pages */
@@ -409,7 +408,6 @@ struct address_space {
         pgoff_t                 writeback_index;/* writeback starts here */
         const struct address_space_operations *a_ops;   /* methods */
         unsigned long           flags;          /* error bits/gfp mask */
-        struct backing_dev_info *backing_dev_info; /* device readahead, etc */
         spinlock_t              private_lock;   /* for use by the address_space */
         struct list_head        private_list;   /* ditto */
         void                    *private_data;  /* ditto */
@@ -493,8 +491,7 @@ static inline void i_mmap_unlock_read(struct address_space *mapping)
  */
 static inline int mapping_mapped(struct address_space *mapping)
 {
-        return  !RB_EMPTY_ROOT(&mapping->i_mmap) ||
-                !list_empty(&mapping->i_mmap_nonlinear);
+        return  !RB_EMPTY_ROOT(&mapping->i_mmap);
 }
 
 /*
@@ -625,7 +622,7 @@ struct inode {
         atomic_t                i_readcount; /* struct files open RO */
 #endif
         const struct file_operations    *i_fop; /* former ->i_op->default_file_ops */
-        struct file_lock        *i_flock;
+        struct file_lock_context        *i_flctx;
         struct address_space    i_data;
         struct list_head        i_devices;
         union {
@@ -875,6 +872,7 @@ static inline struct file *get_file(struct file *f)
 #define FL_DOWNGRADE_PENDING    256 /* Lease is being downgraded */
 #define FL_UNLOCK_PENDING       512 /* Lease is being broken */
 #define FL_OFDLCK       1024    /* lock is "owned" by struct file */
+#define FL_LAYOUT       2048    /* outstanding pNFS layout */
 
 /*
  * Special return value from posix_lock_file() and vfs_lock_file() for
@@ -885,6 +883,8 @@ static inline struct file *get_file(struct file *f)
 /* legacy typedef, should eventually be removed */
 typedef void *fl_owner_t;
 
+struct file_lock;
+
 struct file_lock_operations {
         void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
         void (*fl_release_private)(struct file_lock *);
@@ -898,7 +898,7 @@ struct lock_manager_operations {
         void (*lm_notify)(struct file_lock *);  /* unblock callback */
         int (*lm_grant)(struct file_lock *, int);
         bool (*lm_break)(struct file_lock *);
-        int (*lm_change)(struct file_lock **, int, struct list_head *);
+        int (*lm_change)(struct file_lock *, int, struct list_head *);
         void (*lm_setup)(struct file_lock *, void **);
 };
 
@@ -923,17 +923,17 @@ int locks_in_grace(struct net *);
  * FIXME: should we create a separate "struct lock_request" to help distinguish
  * these two uses?
  *
- * The i_flock list is ordered by:
+ * The varous i_flctx lists are ordered by:
  *
- * 1) lock type -- FL_LEASEs first, then FL_FLOCK, and finally FL_POSIX
- * 2) lock owner
- * 3) lock range start
- * 4) lock range end
+ * 1) lock owner
+ * 2) lock range start
+ * 3) lock range end
  *
  * Obviously, the last two criteria only matter for POSIX locks.
  */
 struct file_lock {
         struct file_lock *fl_next;      /* singly linked list for this inode  */
+        struct list_head fl_list;       /* link into file_lock_context */
         struct hlist_node fl_link;      /* node in global lists */
         struct list_head fl_block;      /* circular list of blocked processes */
         fl_owner_t fl_owner;
@@ -964,6 +964,16 @@ struct file_lock {
         } fl_u;
 };
 
+struct file_lock_context {
+        spinlock_t              flc_lock;
+        struct list_head        flc_flock;
+        struct list_head        flc_posix;
+        struct list_head        flc_lease;
+        int                     flc_flock_cnt;
+        int                     flc_posix_cnt;
+        int                     flc_lease_cnt;
+};
+
 /* The following constant reflects the upper bound of the file/locking space */
 #ifndef OFFSET_MAX
 #define INT_LIMIT(x)    (~((x)1 << (sizeof(x)*8 - 1)))
@@ -990,6 +1000,7 @@ extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
 extern int fcntl_getlease(struct file *filp);
 
 /* fs/locks.c */
+void locks_free_lock_context(struct file_lock_context *ctx);
 void locks_free_lock(struct file_lock *fl);
 extern void locks_init_lock(struct file_lock *);
 extern struct file_lock * locks_alloc_lock(void);
@@ -1010,7 +1021,7 @@ extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int t
 extern void lease_get_mtime(struct inode *, struct timespec *time);
 extern int generic_setlease(struct file *, long, struct file_lock **, void **priv);
 extern int vfs_setlease(struct file *, long, struct file_lock **, void **);
-extern int lease_modify(struct file_lock **, int, struct list_head *);
+extern int lease_modify(struct file_lock *, int, struct list_head *);
 #else /* !CONFIG_FILE_LOCKING */
 static inline int fcntl_getlk(struct file *file, unsigned int cmd,
                               struct flock __user *user)
@@ -1047,6 +1058,11 @@ static inline int fcntl_getlease(struct file *filp)
         return F_UNLCK;
 }
 
+static inline void
+locks_free_lock_context(struct file_lock_context *ctx)
+{
+}
+
 static inline void locks_init_lock(struct file_lock *fl)
 {
         return;
@@ -1137,7 +1153,7 @@ static inline int vfs_setlease(struct file *filp, long arg,
         return -EINVAL;
 }
 
-static inline int lease_modify(struct file_lock **before, int arg,
+static inline int lease_modify(struct file_lock *fl, int arg,
                                struct list_head *dispose)
 {
         return -EINVAL;
@@ -1184,8 +1200,6 @@ struct mm_struct;
 #define UMOUNT_NOFOLLOW 0x00000008      /* Don't follow symlink on umount */
 #define UMOUNT_UNUSED   0x80000000      /* Flag guaranteed to be unused */
 
-extern struct list_head super_blocks;
-extern spinlock_t sb_lock;
 
 /* Possible states of 'frozen' field */
 enum {
@@ -1502,6 +1516,26 @@ struct block_device_operations;
 #define HAVE_COMPAT_IOCTL 1
 #define HAVE_UNLOCKED_IOCTL 1
 
+/*
+ * These flags let !MMU mmap() govern direct device mapping vs immediate
+ * copying more easily for MAP_PRIVATE, especially for ROM filesystems.
+ *
+ * NOMMU_MAP_COPY:      Copy can be mapped (MAP_PRIVATE)
+ * NOMMU_MAP_DIRECT:    Can be mapped directly (MAP_SHARED)
+ * NOMMU_MAP_READ:      Can be mapped for reading
+ * NOMMU_MAP_WRITE:     Can be mapped for writing
+ * NOMMU_MAP_EXEC:      Can be mapped for execution
+ */
+#define NOMMU_MAP_COPY          0x00000001
+#define NOMMU_MAP_DIRECT        0x00000008
+#define NOMMU_MAP_READ          VM_MAYREAD
+#define NOMMU_MAP_WRITE         VM_MAYWRITE
+#define NOMMU_MAP_EXEC          VM_MAYEXEC
+
+#define NOMMU_VMFLAGS \
+        (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC)
+
+
 struct iov_iter;
 
 struct file_operations {
@@ -1536,6 +1570,9 @@ struct file_operations {
         long (*fallocate)(struct file *file, int mode, loff_t offset,
                           loff_t len);
         void (*show_fdinfo)(struct seq_file *m, struct file *f);
+#ifndef CONFIG_MMU
+        unsigned (*mmap_capabilities)(struct file *);
+#endif
 };
 
 struct inode_operations {
@@ -1959,7 +1996,7 @@ static inline int locks_verify_truncate(struct inode *inode,
                                     struct file *filp,
                                     loff_t size)
 {
-        if (inode->i_flock && mandatory_lock(inode))
+        if (inode->i_flctx && mandatory_lock(inode))
                 return locks_mandatory_area(
                         FLOCK_VERIFY_WRITE, inode, filp,
                         size < inode->i_size ? size : inode->i_size,
@@ -1973,11 +2010,12 @@ static inline int break_lease(struct inode *inode, unsigned int mode)
 {
         /*
          * Since this check is lockless, we must ensure that any refcounts
-         * taken are done before checking inode->i_flock. Otherwise, we could
-         * end up racing with tasks trying to set a new lease on this file.
+         * taken are done before checking i_flctx->flc_lease. Otherwise, we
+         * could end up racing with tasks trying to set a new lease on this
+         * file.
          */
         smp_mb();
-        if (inode->i_flock)
+        if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
                 return __break_lease(inode, mode, FL_LEASE);
         return 0;
 }
@@ -1986,11 +2024,12 @@ static inline int break_deleg(struct inode *inode, unsigned int mode)
 {
         /*
          * Since this check is lockless, we must ensure that any refcounts
-         * taken are done before checking inode->i_flock. Otherwise, we could
-         * end up racing with tasks trying to set a new lease on this file.
+         * taken are done before checking i_flctx->flc_lease. Otherwise, we
+         * could end up racing with tasks trying to set a new lease on this
+         * file.
          */
         smp_mb();
-        if (inode->i_flock)
+        if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
                 return __break_lease(inode, mode, FL_DELEG);
         return 0;
 }
@@ -2017,6 +2056,16 @@ static inline int break_deleg_wait(struct inode **delegated_inode)
         return ret;
 }
 
+static inline int break_layout(struct inode *inode, bool wait)
+{
+        smp_mb();
+        if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease))
+                return __break_lease(inode,
+                                wait ? O_WRONLY : O_WRONLY | O_NONBLOCK,
+                                FL_LAYOUT);
+        return 0;
+}
+
 #else /* !CONFIG_FILE_LOCKING */
 static inline int locks_mandatory_locked(struct file *file)
 {
@@ -2072,6 +2121,11 @@ static inline int break_deleg_wait(struct inode **delegated_inode)
         return 0;
 }
 
+static inline int break_layout(struct inode *inode, bool wait)
+{
+        return 0;
+}
+
 #endif /* CONFIG_FILE_LOCKING */
 
 /* fs/open.c */
@@ -2481,8 +2535,6 @@ extern int sb_min_blocksize(struct super_block *, int);
 
 extern int generic_file_mmap(struct file *, struct vm_area_struct *);
 extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
-extern int generic_file_remap_pages(struct vm_area_struct *, unsigned long addr,
-                unsigned long size, pgoff_t pgoff);
 int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
 extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *);
 extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *);