Take statfs variants to fs/statfs.c
Al Viro [Tue, 23 Mar 2010 14:37:36 +0000 (10:37 -0400)]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/Makefile
fs/open.c
fs/statfs.c [new file with mode: 0644]
fs/super.c

index 97f340f..e6ec1d3 100644 (file)
@@ -11,7 +11,7 @@ obj-y :=      open.o read_write.o file_table.o super.o \
                attr.o bad_inode.o file.o filesystems.o namespace.o \
                seq_file.o xattr.o libfs.o fs-writeback.o \
                pnode.o drop_caches.o splice.o sync.o utimes.o \
-               stack.o fs_struct.o
+               stack.o fs_struct.o statfs.o
 
 ifeq ($(CONFIG_BLOCK),y)
 obj-y +=       buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o
index 74e5cd9..5463266 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -17,7 +17,6 @@
 #include <linux/securebits.h>
 #include <linux/security.h>
 #include <linux/mount.h>
-#include <linux/vfs.h>
 #include <linux/fcntl.h>
 #include <linux/slab.h>
 #include <asm/uaccess.h>
 
 #include "internal.h"
 
-int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
-       int retval = -ENODEV;
-
-       if (dentry) {
-               retval = -ENOSYS;
-               if (dentry->d_sb->s_op->statfs) {
-                       memset(buf, 0, sizeof(*buf));
-                       retval = security_sb_statfs(dentry);
-                       if (retval)
-                               return retval;
-                       retval = dentry->d_sb->s_op->statfs(dentry, buf);
-                       if (retval == 0 && buf->f_frsize == 0)
-                               buf->f_frsize = buf->f_bsize;
-               }
-       }
-       return retval;
-}
-
-EXPORT_SYMBOL(vfs_statfs);
-
-static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
-{
-       struct kstatfs st;
-       int retval;
-
-       retval = vfs_statfs(dentry, &st);
-       if (retval)
-               return retval;
-
-       if (sizeof(*buf) == sizeof(st))
-               memcpy(buf, &st, sizeof(st));
-       else {
-               if (sizeof buf->f_blocks == 4) {
-                       if ((st.f_blocks | st.f_bfree | st.f_bavail |
-                            st.f_bsize | st.f_frsize) &
-                           0xffffffff00000000ULL)
-                               return -EOVERFLOW;
-                       /*
-                        * f_files and f_ffree may be -1; it's okay to stuff
-                        * that into 32 bits
-                        */
-                       if (st.f_files != -1 &&
-                           (st.f_files & 0xffffffff00000000ULL))
-                               return -EOVERFLOW;
-                       if (st.f_ffree != -1 &&
-                           (st.f_ffree & 0xffffffff00000000ULL))
-                               return -EOVERFLOW;
-               }
-
-               buf->f_type = st.f_type;
-               buf->f_bsize = st.f_bsize;
-               buf->f_blocks = st.f_blocks;
-               buf->f_bfree = st.f_bfree;
-               buf->f_bavail = st.f_bavail;
-               buf->f_files = st.f_files;
-               buf->f_ffree = st.f_ffree;
-               buf->f_fsid = st.f_fsid;
-               buf->f_namelen = st.f_namelen;
-               buf->f_frsize = st.f_frsize;
-               memset(buf->f_spare, 0, sizeof(buf->f_spare));
-       }
-       return 0;
-}
-
-static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
-{
-       struct kstatfs st;
-       int retval;
-
-       retval = vfs_statfs(dentry, &st);
-       if (retval)
-               return retval;
-
-       if (sizeof(*buf) == sizeof(st))
-               memcpy(buf, &st, sizeof(st));
-       else {
-               buf->f_type = st.f_type;
-               buf->f_bsize = st.f_bsize;
-               buf->f_blocks = st.f_blocks;
-               buf->f_bfree = st.f_bfree;
-               buf->f_bavail = st.f_bavail;
-               buf->f_files = st.f_files;
-               buf->f_ffree = st.f_ffree;
-               buf->f_fsid = st.f_fsid;
-               buf->f_namelen = st.f_namelen;
-               buf->f_frsize = st.f_frsize;
-               memset(buf->f_spare, 0, sizeof(buf->f_spare));
-       }
-       return 0;
-}
-
-SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf)
-{
-       struct path path;
-       int error;
-
-       error = user_path(pathname, &path);
-       if (!error) {
-               struct statfs tmp;
-               error = vfs_statfs_native(path.dentry, &tmp);
-               if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
-                       error = -EFAULT;
-               path_put(&path);
-       }
-       return error;
-}
-
-SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf)
-{
-       struct path path;
-       long error;
-
-       if (sz != sizeof(*buf))
-               return -EINVAL;
-       error = user_path(pathname, &path);
-       if (!error) {
-               struct statfs64 tmp;
-               error = vfs_statfs64(path.dentry, &tmp);
-               if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
-                       error = -EFAULT;
-               path_put(&path);
-       }
-       return error;
-}
-
-SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
-{
-       struct file * file;
-       struct statfs tmp;
-       int error;
-
-       error = -EBADF;
-       file = fget(fd);
-       if (!file)
-               goto out;
-       error = vfs_statfs_native(file->f_path.dentry, &tmp);
-       if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
-               error = -EFAULT;
-       fput(file);
-out:
-       return error;
-}
-
-SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf)
-{
-       struct file * file;
-       struct statfs64 tmp;
-       int error;
-
-       if (sz != sizeof(*buf))
-               return -EINVAL;
-
-       error = -EBADF;
-       file = fget(fd);
-       if (!file)
-               goto out;
-       error = vfs_statfs64(file->f_path.dentry, &tmp);
-       if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
-               error = -EFAULT;
-       fput(file);
-out:
-       return error;
-}
-
 int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
        struct file *filp)
 {
diff --git a/fs/statfs.c b/fs/statfs.c
new file mode 100644 (file)
index 0000000..4ef021f
--- /dev/null
@@ -0,0 +1,196 @@
+#include <linux/syscalls.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/namei.h>
+#include <linux/statfs.h>
+#include <linux/security.h>
+#include <linux/uaccess.h>
+
+int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+       int retval = -ENODEV;
+
+       if (dentry) {
+               retval = -ENOSYS;
+               if (dentry->d_sb->s_op->statfs) {
+                       memset(buf, 0, sizeof(*buf));
+                       retval = security_sb_statfs(dentry);
+                       if (retval)
+                               return retval;
+                       retval = dentry->d_sb->s_op->statfs(dentry, buf);
+                       if (retval == 0 && buf->f_frsize == 0)
+                               buf->f_frsize = buf->f_bsize;
+               }
+       }
+       return retval;
+}
+
+EXPORT_SYMBOL(vfs_statfs);
+
+static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
+{
+       struct kstatfs st;
+       int retval;
+
+       retval = vfs_statfs(dentry, &st);
+       if (retval)
+               return retval;
+
+       if (sizeof(*buf) == sizeof(st))
+               memcpy(buf, &st, sizeof(st));
+       else {
+               if (sizeof buf->f_blocks == 4) {
+                       if ((st.f_blocks | st.f_bfree | st.f_bavail |
+                            st.f_bsize | st.f_frsize) &
+                           0xffffffff00000000ULL)
+                               return -EOVERFLOW;
+                       /*
+                        * f_files and f_ffree may be -1; it's okay to stuff
+                        * that into 32 bits
+                        */
+                       if (st.f_files != -1 &&
+                           (st.f_files & 0xffffffff00000000ULL))
+                               return -EOVERFLOW;
+                       if (st.f_ffree != -1 &&
+                           (st.f_ffree & 0xffffffff00000000ULL))
+                               return -EOVERFLOW;
+               }
+
+               buf->f_type = st.f_type;
+               buf->f_bsize = st.f_bsize;
+               buf->f_blocks = st.f_blocks;
+               buf->f_bfree = st.f_bfree;
+               buf->f_bavail = st.f_bavail;
+               buf->f_files = st.f_files;
+               buf->f_ffree = st.f_ffree;
+               buf->f_fsid = st.f_fsid;
+               buf->f_namelen = st.f_namelen;
+               buf->f_frsize = st.f_frsize;
+               memset(buf->f_spare, 0, sizeof(buf->f_spare));
+       }
+       return 0;
+}
+
+static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
+{
+       struct kstatfs st;
+       int retval;
+
+       retval = vfs_statfs(dentry, &st);
+       if (retval)
+               return retval;
+
+       if (sizeof(*buf) == sizeof(st))
+               memcpy(buf, &st, sizeof(st));
+       else {
+               buf->f_type = st.f_type;
+               buf->f_bsize = st.f_bsize;
+               buf->f_blocks = st.f_blocks;
+               buf->f_bfree = st.f_bfree;
+               buf->f_bavail = st.f_bavail;
+               buf->f_files = st.f_files;
+               buf->f_ffree = st.f_ffree;
+               buf->f_fsid = st.f_fsid;
+               buf->f_namelen = st.f_namelen;
+               buf->f_frsize = st.f_frsize;
+               memset(buf->f_spare, 0, sizeof(buf->f_spare));
+       }
+       return 0;
+}
+
+SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf)
+{
+       struct path path;
+       int error;
+
+       error = user_path(pathname, &path);
+       if (!error) {
+               struct statfs tmp;
+               error = vfs_statfs_native(path.dentry, &tmp);
+               if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
+                       error = -EFAULT;
+               path_put(&path);
+       }
+       return error;
+}
+
+SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf)
+{
+       struct path path;
+       long error;
+
+       if (sz != sizeof(*buf))
+               return -EINVAL;
+       error = user_path(pathname, &path);
+       if (!error) {
+               struct statfs64 tmp;
+               error = vfs_statfs64(path.dentry, &tmp);
+               if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
+                       error = -EFAULT;
+               path_put(&path);
+       }
+       return error;
+}
+
+SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
+{
+       struct file *file;
+       struct statfs tmp;
+       int error;
+
+       error = -EBADF;
+       file = fget(fd);
+       if (!file)
+               goto out;
+       error = vfs_statfs_native(file->f_path.dentry, &tmp);
+       if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
+               error = -EFAULT;
+       fput(file);
+out:
+       return error;
+}
+
+SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf)
+{
+       struct file *file;
+       struct statfs64 tmp;
+       int error;
+
+       if (sz != sizeof(*buf))
+               return -EINVAL;
+
+       error = -EBADF;
+       file = fget(fd);
+       if (!file)
+               goto out;
+       error = vfs_statfs64(file->f_path.dentry, &tmp);
+       if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
+               error = -EFAULT;
+       fput(file);
+out:
+       return error;
+}
+
+SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
+{
+       struct super_block *s;
+       struct ustat tmp;
+       struct kstatfs sbuf;
+       int err;
+
+       s = user_get_super(new_decode_dev(dev));
+       if (!s)
+               return -EINVAL;
+
+       err = vfs_statfs(s->s_root, &sbuf);
+       drop_super(s);
+       if (err)
+               return err;
+
+       memset(&tmp,0,sizeof(struct ustat));
+       tmp.f_tfree = sbuf.f_bfree;
+       tmp.f_tinode = sbuf.f_ffree;
+
+       return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
+}
index 2c3e370..dba74e7 100644 (file)
@@ -31,7 +31,6 @@
 #include <linux/mount.h>
 #include <linux/security.h>
 #include <linux/syscalls.h>
-#include <linux/vfs.h>
 #include <linux/writeback.h>           /* for the emergency remount stuff */
 #include <linux/idr.h>
 #include <linux/kobject.h>
@@ -519,30 +518,6 @@ rescan:
        return NULL;
 }
 
-SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
-{
-        struct super_block *s;
-        struct ustat tmp;
-        struct kstatfs sbuf;
-       int err = -EINVAL;
-
-        s = user_get_super(new_decode_dev(dev));
-        if (s == NULL)
-                goto out;
-       err = vfs_statfs(s->s_root, &sbuf);
-       drop_super(s);
-       if (err)
-               goto out;
-
-        memset(&tmp,0,sizeof(struct ustat));
-        tmp.f_tfree = sbuf.f_bfree;
-        tmp.f_tinode = sbuf.f_ffree;
-
-        err = copy_to_user(ubuf,&tmp,sizeof(struct ustat)) ? -EFAULT : 0;
-out:
-       return err;
-}
-
 /**
  *     do_remount_sb - asks filesystem to change mount options.
  *     @sb:    superblock in question