Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / fs / ext4 / ext4.h

diff --git a/kernel/fs/ext4/ext4.h b/kernel/fs/ext4/ext4.h
index cc7ca4e..cd59144 100644 (file)
--- a/kernel/fs/ext4/ext4.h
+++ b/kernel/fs/ext4/ext4.h
@@ -221,6 +221,7 @@ struct ext4_io_submit {
 #define        EXT4_MAX_BLOCK_SIZE             65536
 #define EXT4_MIN_BLOCK_LOG_SIZE                10
 #define EXT4_MAX_BLOCK_LOG_SIZE                16
+#define EXT4_MAX_CLUSTER_LOG_SIZE      30
 #ifdef __KERNEL__
 # define EXT4_BLOCK_SIZE(s)            ((s)->s_blocksize)
 #else
@@ -849,6 +850,29 @@ do {                                                                              \
 
 #include "extents_status.h"
 
+/*
+ * Lock subclasses for i_data_sem in the ext4_inode_info structure.
+ *
+ * These are needed to avoid lockdep false positives when we need to
+ * allocate blocks to the quota inode during ext4_map_blocks(), while
+ * holding i_data_sem for a normal (non-quota) inode.  Since we don't
+ * do quota tracking for the quota inode, this avoids deadlock (as
+ * well as infinite recursion, since it isn't turtles all the way
+ * down...)
+ *
+ *  I_DATA_SEM_NORMAL - Used for most inodes
+ *  I_DATA_SEM_OTHER  - Used by move_inode.c for the second normal inode
+ *                       where the second inode has larger inode number
+ *                       than the first
+ *  I_DATA_SEM_QUOTA  - Used for quota inodes only
+ */
+enum {
+       I_DATA_SEM_NORMAL = 0,
+       I_DATA_SEM_OTHER,
+       I_DATA_SEM_QUOTA,
+};
+
+
 /*
  * fourth extended file system inode data in memory
  */
@@ -910,6 +934,15 @@ struct ext4_inode_info {
         * by other means, so we have i_data_sem.
         */
        struct rw_semaphore i_data_sem;
+       /*
+        * i_mmap_sem is for serializing page faults with truncate / punch hole
+        * operations. We have to make sure that new page cannot be faulted in
+        * a section of the inode that is being punched. We cannot easily use
+        * i_data_sem for this since we need protection for the whole punch
+        * operation and i_data_sem ranks below transaction start so we have
+        * to occasionally drop it.
+        */
+       struct rw_semaphore i_mmap_sem;
        struct inode vfs_inode;
        struct jbd2_inode *jinode;
 
@@ -2484,6 +2517,7 @@ extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
                             loff_t lstart, loff_t lend);
 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
+extern int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
 extern void ext4_da_update_reserve_space(struct inode *inode,
                                        int used, int quota_claim);
@@ -2848,6 +2882,9 @@ static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
        return changed;
 }
 
+int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
+                                     loff_t len);
+
 struct ext4_group_info {
        unsigned long   bb_state;
        struct rb_root  bb_free_root;