AndroidComputer: remote Kconfig default n

[firefly-linux-kernel-4.4.55.git] / fs / ioctl.c

diff --git a/fs/ioctl.c b/fs/ioctl.c
index f855ea4fc88895a13b53b075b9a3fb0dbcb53d8b..1d9b9fcb2db48ec682b4e696bbab9dbb79fd26b9 100644 (file)
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -6,7 +6,6 @@
 
 #include <linux/syscalls.h>
 #include <linux/mm.h>
-#include <linux/smp_lock.h>
 #include <linux/capability.h>
 #include <linux/file.h>
 #include <linux/fs.h>
@@ -87,7 +86,7 @@ int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
                            u64 phys, u64 len, u32 flags)
 {
        struct fiemap_extent extent;
-       struct fiemap_extent *dest = fieinfo->fi_extents_start;
+       struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
 
        /* only count the extents */
        if (fieinfo->fi_extents_max == 0) {
@@ -174,6 +173,7 @@ static int fiemap_check_ranges(struct super_block *sb,
 static int ioctl_fiemap(struct file *filp, unsigned long arg)
 {
        struct fiemap fiemap;
+       struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
        struct fiemap_extent_info fieinfo = { 0, };
        struct inode *inode = filp->f_path.dentry->d_inode;
        struct super_block *sb = inode->i_sb;
@@ -183,8 +183,7 @@ static int ioctl_fiemap(struct file *filp, unsigned long arg)
        if (!inode->i_op->fiemap)
                return -EOPNOTSUPP;
 
-       if (copy_from_user(&fiemap, (struct fiemap __user *)arg,
-                          sizeof(struct fiemap)))
+       if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
                return -EFAULT;
 
        if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
@@ -197,7 +196,7 @@ static int ioctl_fiemap(struct file *filp, unsigned long arg)
 
        fieinfo.fi_flags = fiemap.fm_flags;
        fieinfo.fi_extents_max = fiemap.fm_extent_count;
-       fieinfo.fi_extents_start = (struct fiemap_extent *)(arg + sizeof(fiemap));
+       fieinfo.fi_extents_start = ufiemap->fm_extents;
 
        if (fiemap.fm_extent_count != 0 &&
            !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
@@ -210,7 +209,7 @@ static int ioctl_fiemap(struct file *filp, unsigned long arg)
        error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
        fiemap.fm_flags = fieinfo.fi_flags;
        fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
-       if (copy_to_user((char *)arg, &fiemap, sizeof(fiemap)))
+       if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
                error = -EFAULT;
 
        return error;
@@ -274,6 +273,13 @@ int __generic_block_fiemap(struct inode *inode,
                len = isize;
        }
 
+       /*
+        * Some filesystems can't deal with being asked to map less than
+        * blocksize, so make sure our len is at least block length.
+        */
+       if (logical_to_blk(inode, len) == 0)
+               len = blk_to_logical(inode, 1);
+
        start_blk = logical_to_blk(inode, start);
        last_blk = logical_to_blk(inode, start + len - 1);
 
@@ -542,6 +548,7 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
 {
        int error = 0;
        int __user *argp = (int __user *)arg;
+       struct inode *inode = filp->f_path.dentry->d_inode;
 
        switch (cmd) {
        case FIOCLEX:
@@ -561,13 +568,11 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
                break;
 
        case FIOQSIZE:
-               if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
-                   S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
-                   S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
-                       loff_t res =
-                               inode_get_bytes(filp->f_path.dentry->d_inode);
-                       error = copy_to_user((loff_t __user *)arg, &res,
-                                            sizeof(res)) ? -EFAULT : 0;
+               if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
+                   S_ISLNK(inode->i_mode)) {
+                       loff_t res = inode_get_bytes(inode);
+                       error = copy_to_user(argp, &res, sizeof(res)) ?
+                                       -EFAULT : 0;
                } else
                        error = -ENOTTY;
                break;
@@ -584,14 +589,10 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
                return ioctl_fiemap(filp, arg);
 
        case FIGETBSZ:
-       {
-               struct inode *inode = filp->f_path.dentry->d_inode;
-               int __user *p = (int __user *)arg;
-               return put_user(inode->i_sb->s_blocksize, p);
-       }
+               return put_user(inode->i_sb->s_blocksize, argp);
 
        default:
-               if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
+               if (S_ISREG(inode->i_mode))
                        error = file_ioctl(filp, cmd, arg);
                else
                        error = vfs_ioctl(filp, cmd, arg);