import PULS_20180308

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 43db02e9c9fa11bed1b058fba9dd9039ea9c226d..3b70fb0cb5b3b7342c3c5fc73eb6e78e2abba4f6 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -244,6 +244,12 @@ struct iattr {
  */
 #include <linux/quota.h>
 
+/*
+ * Maximum number of layers of fs stack. Needs to be limited to
+ * prevent kernel stack overflow
+ */
+#define FILESYSTEM_MAX_STACK_DEPTH 2
+
 /** 
  * enum positive_aop_returns - aop return codes with specific semantics
  *
@@ -1322,6 +1328,11 @@ struct super_block {
 
        /* Being remounted read-only */
        int s_readonly_remount;
+
+       /*
+        * Indicates how deep in a filesystem stack this SB is
+        */
+       int s_stack_depth;
 };
 
 /* superblock cache pruning functions */
@@ -1634,6 +1645,8 @@ struct super_operations {
 #define S_IMA          1024    /* Inode has an associated IMA struct */
 #define S_AUTOMOUNT    2048    /* Automount/referral quasi-directory */
 #define S_NOSEC                4096    /* no suid or xattr security attributes */
+#define S_ATOMIC_COPY  8192    /* Pages mapped with this inode need to be
+                                  atomically copied (gem) */
 
 /*
  * Note that nosuid etc flags are inode-specific: setting some file-system
@@ -2058,6 +2071,13 @@ extern struct super_block *freeze_bdev(struct block_device *);
 extern void emergency_thaw_all(void);
 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
 extern int fsync_bdev(struct block_device *);
+extern int fsync_super(struct super_block *);
+extern int fsync_no_super(struct block_device *);
+#define FS_FREEZER_FUSE 1
+#define FS_FREEZER_NORMAL 2
+#define FS_FREEZER_ALL (FS_FREEZER_FUSE | FS_FREEZER_NORMAL)
+void freeze_filesystems(int which);
+void thaw_filesystems(int which);
 #else
 static inline void bd_forget(struct inode *inode) {}
 static inline int sync_blockdev(struct block_device *bdev) { return 0; }
@@ -2414,8 +2434,6 @@ extern ssize_t generic_file_splice_write(struct pipe_inode_info *,
                struct file *, loff_t *, size_t, unsigned int);
 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
                struct file *out, loff_t *, size_t len, unsigned int flags);
-extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
-               size_t len, unsigned int flags);
 
 extern void
 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);