Btrfs: write out free space cache

[~andy/linux] / fs / stat.c

diff --git a/fs/stat.c b/fs/stat.c
index 075694e31d8b62fbcf6c935fd0b74220844abfe6..12e90e213900542291a0fa74da940c0588b69ace 100644 (file)
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -68,7 +68,8 @@ int vfs_fstat(unsigned int fd, struct kstat *stat)
 }
 EXPORT_SYMBOL(vfs_fstat);
 
-int vfs_fstatat(int dfd, char __user *filename, struct kstat *stat, int flag)
+int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
+               int flag)
 {
        struct path path;
        int error = -EINVAL;
@@ -91,13 +92,13 @@ out:
 }
 EXPORT_SYMBOL(vfs_fstatat);
 
-int vfs_stat(char __user *name, struct kstat *stat)
+int vfs_stat(const char __user *name, struct kstat *stat)
 {
        return vfs_fstatat(AT_FDCWD, name, stat, 0);
 }
 EXPORT_SYMBOL(vfs_stat);
 
-int vfs_lstat(char __user *name, struct kstat *stat)
+int vfs_lstat(const char __user *name, struct kstat *stat)
 {
        return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
 }
@@ -147,7 +148,8 @@ static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * sta
        return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 }
 
-SYSCALL_DEFINE2(stat, char __user *, filename, struct __old_kernel_stat __user *, statbuf)
+SYSCALL_DEFINE2(stat, const char __user *, filename,
+               struct __old_kernel_stat __user *, statbuf)
 {
        struct kstat stat;
        int error;
@@ -159,7 +161,8 @@ SYSCALL_DEFINE2(stat, char __user *, filename, struct __old_kernel_stat __user *
        return cp_old_stat(&stat, statbuf);
 }
 
-SYSCALL_DEFINE2(lstat, char __user *, filename, struct __old_kernel_stat __user *, statbuf)
+SYSCALL_DEFINE2(lstat, const char __user *, filename,
+               struct __old_kernel_stat __user *, statbuf)
 {
        struct kstat stat;
        int error;
@@ -234,7 +237,8 @@ static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
        return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 }
 
-SYSCALL_DEFINE2(newstat, char __user *, filename, struct stat __user *, statbuf)
+SYSCALL_DEFINE2(newstat, const char __user *, filename,
+               struct stat __user *, statbuf)
 {
        struct kstat stat;
        int error = vfs_stat(filename, &stat);
@@ -244,7 +248,8 @@ SYSCALL_DEFINE2(newstat, char __user *, filename, struct stat __user *, statbuf)
        return cp_new_stat(&stat, statbuf);
 }
 
-SYSCALL_DEFINE2(newlstat, char __user *, filename, struct stat __user *, statbuf)
+SYSCALL_DEFINE2(newlstat, const char __user *, filename,
+               struct stat __user *, statbuf)
 {
        struct kstat stat;
        int error;
@@ -257,7 +262,7 @@ SYSCALL_DEFINE2(newlstat, char __user *, filename, struct stat __user *, statbuf
 }
 
 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
-SYSCALL_DEFINE4(newfstatat, int, dfd, char __user *, filename,
+SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
                struct stat __user *, statbuf, int, flag)
 {
        struct kstat stat;
@@ -355,7 +360,8 @@ static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
        return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 }
 
-SYSCALL_DEFINE2(stat64, char __user *, filename, struct stat64 __user *, statbuf)
+SYSCALL_DEFINE2(stat64, const char __user *, filename,
+               struct stat64 __user *, statbuf)
 {
        struct kstat stat;
        int error = vfs_stat(filename, &stat);
@@ -366,7 +372,8 @@ SYSCALL_DEFINE2(stat64, char __user *, filename, struct stat64 __user *, statbuf
        return error;
 }
 
-SYSCALL_DEFINE2(lstat64, char __user *, filename, struct stat64 __user *, statbuf)
+SYSCALL_DEFINE2(lstat64, const char __user *, filename,
+               struct stat64 __user *, statbuf)
 {
        struct kstat stat;
        int error = vfs_lstat(filename, &stat);
@@ -388,7 +395,7 @@ SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
        return error;
 }
 
-SYSCALL_DEFINE4(fstatat64, int, dfd, char __user *, filename,
+SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
                struct stat64 __user *, statbuf, int, flag)
 {
        struct kstat stat;
@@ -401,9 +408,9 @@ SYSCALL_DEFINE4(fstatat64, int, dfd, char __user *, filename,
 }
 #endif /* __ARCH_WANT_STAT64 */
 
-void inode_add_bytes(struct inode *inode, loff_t bytes)
+/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
+void __inode_add_bytes(struct inode *inode, loff_t bytes)
 {
-       spin_lock(&inode->i_lock);
        inode->i_blocks += bytes >> 9;
        bytes &= 511;
        inode->i_bytes += bytes;
@@ -411,6 +418,12 @@ void inode_add_bytes(struct inode *inode, loff_t bytes)
                inode->i_blocks++;
                inode->i_bytes -= 512;
        }
+}
+
+void inode_add_bytes(struct inode *inode, loff_t bytes)
+{
+       spin_lock(&inode->i_lock);
+       __inode_add_bytes(inode, bytes);
        spin_unlock(&inode->i_lock);
 }