mm_for_maps: shift down_read(mmap_sem) to the caller

[pandora-kernel.git] / fs / namei.c

diff --git a/fs/namei.c b/fs/namei.c
index a7b0a0b..2259d21 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -274,7 +274,7 @@ int inode_permission(struct inode *inode, int mask)
                return retval;
 
        return security_inode_permission(inode,
-                       mask & (MAY_READ|MAY_WRITE|MAY_EXEC));
+                       mask & (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND));
 }
 
 /**
@@ -1431,8 +1431,7 @@ static int may_delete(struct inode *dir,struct dentry *victim,int isdir)
  *  3. We should have write and exec permissions on dir
  *  4. We can't do it if dir is immutable (done in permission())
  */
-static inline int may_create(struct inode *dir, struct dentry *child,
-                            struct nameidata *nd)
+static inline int may_create(struct inode *dir, struct dentry *child)
 {
        if (child->d_inode)
                return -EEXIST;
@@ -1504,7 +1503,7 @@ void unlock_rename(struct dentry *p1, struct dentry *p2)
 int vfs_create(struct inode *dir, struct dentry *dentry, int mode,
                struct nameidata *nd)
 {
-       int error = may_create(dir, dentry, nd);
+       int error = may_create(dir, dentry);
 
        if (error)
                return error;
@@ -1948,7 +1947,7 @@ EXPORT_SYMBOL_GPL(lookup_create);
 
 int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 {
-       int error = may_create(dir, dentry, NULL);
+       int error = may_create(dir, dentry);
 
        if (error)
                return error;
@@ -1991,8 +1990,8 @@ static int may_mknod(mode_t mode)
        }
 }
 
-asmlinkage long sys_mknodat(int dfd, const char __user *filename, int mode,
-                               unsigned dev)
+SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, int, mode,
+               unsigned, dev)
 {
        int error;
        char *tmp;
@@ -2042,14 +2041,14 @@ out_unlock:
        return error;
 }
 
-asmlinkage long sys_mknod(const char __user *filename, int mode, unsigned dev)
+SYSCALL_DEFINE3(mknod, const char __user *, filename, int, mode, unsigned, dev)
 {
        return sys_mknodat(AT_FDCWD, filename, mode, dev);
 }
 
 int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 {
-       int error = may_create(dir, dentry, NULL);
+       int error = may_create(dir, dentry);
 
        if (error)
                return error;
@@ -2069,7 +2068,7 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
        return error;
 }
 
-asmlinkage long sys_mkdirat(int dfd, const char __user *pathname, int mode)
+SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, int, mode)
 {
        int error = 0;
        char * tmp;
@@ -2102,7 +2101,7 @@ out_err:
        return error;
 }
 
-asmlinkage long sys_mkdir(const char __user *pathname, int mode)
+SYSCALL_DEFINE2(mkdir, const char __user *, pathname, int, mode)
 {
        return sys_mkdirat(AT_FDCWD, pathname, mode);
 }
@@ -2209,7 +2208,7 @@ exit1:
        return error;
 }
 
-asmlinkage long sys_rmdir(const char __user *pathname)
+SYSCALL_DEFINE1(rmdir, const char __user *, pathname)
 {
        return do_rmdir(AT_FDCWD, pathname);
 }
@@ -2298,7 +2297,7 @@ slashes:
        goto exit2;
 }
 
-asmlinkage long sys_unlinkat(int dfd, const char __user *pathname, int flag)
+SYSCALL_DEFINE3(unlinkat, int, dfd, const char __user *, pathname, int, flag)
 {
        if ((flag & ~AT_REMOVEDIR) != 0)
                return -EINVAL;
@@ -2309,14 +2308,14 @@ asmlinkage long sys_unlinkat(int dfd, const char __user *pathname, int flag)
        return do_unlinkat(dfd, pathname);
 }
 
-asmlinkage long sys_unlink(const char __user *pathname)
+SYSCALL_DEFINE1(unlink, const char __user *, pathname)
 {
        return do_unlinkat(AT_FDCWD, pathname);
 }
 
 int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
 {
-       int error = may_create(dir, dentry, NULL);
+       int error = may_create(dir, dentry);
 
        if (error)
                return error;
@@ -2335,8 +2334,8 @@ int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
        return error;
 }
 
-asmlinkage long sys_symlinkat(const char __user *oldname,
-                             int newdfd, const char __user *newname)
+SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
+               int, newdfd, const char __user *, newname)
 {
        int error;
        char *from;
@@ -2373,7 +2372,7 @@ out_putname:
        return error;
 }
 
-asmlinkage long sys_symlink(const char __user *oldname, const char __user *newname)
+SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newname)
 {
        return sys_symlinkat(oldname, AT_FDCWD, newname);
 }
@@ -2386,7 +2385,7 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
        if (!inode)
                return -ENOENT;
 
-       error = may_create(dir, new_dentry, NULL);
+       error = may_create(dir, new_dentry);
        if (error)
                return error;
 
@@ -2425,9 +2424,8 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
  * with linux 2.0, and to avoid hard-linking to directories
  * and other special files.  --ADM
  */
-asmlinkage long sys_linkat(int olddfd, const char __user *oldname,
-                          int newdfd, const char __user *newname,
-                          int flags)
+SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
+               int, newdfd, const char __user *, newname, int, flags)
 {
        struct dentry *new_dentry;
        struct nameidata nd;
@@ -2472,7 +2470,7 @@ out:
        return error;
 }
 
-asmlinkage long sys_link(const char __user *oldname, const char __user *newname)
+SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname)
 {
        return sys_linkat(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
 }
@@ -2595,7 +2593,7 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                return error;
 
        if (!new_dentry->d_inode)
-               error = may_create(new_dir, new_dentry, NULL);
+               error = may_create(new_dir, new_dentry);
        else
                error = may_delete(new_dir, new_dentry, is_dir);
        if (error)
@@ -2623,8 +2621,8 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
        return error;
 }
 
-asmlinkage long sys_renameat(int olddfd, const char __user *oldname,
-                            int newdfd, const char __user *newname)
+SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
+               int, newdfd, const char __user *, newname)
 {
        struct dentry *old_dir, *new_dir;
        struct dentry *old_dentry, *new_dentry;
@@ -2708,7 +2706,7 @@ exit:
        return error;
 }
 
-asmlinkage long sys_rename(const char __user *oldname, const char __user *newname)
+SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newname)
 {
        return sys_renameat(AT_FDCWD, oldname, AT_FDCWD, newname);
 }
@@ -2798,18 +2796,23 @@ void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
        }
 }
 
-int __page_symlink(struct inode *inode, const char *symname, int len,
-               gfp_t gfp_mask)
+/*
+ * The nofs argument instructs pagecache_write_begin to pass AOP_FLAG_NOFS
+ */
+int __page_symlink(struct inode *inode, const char *symname, int len, int nofs)
 {
        struct address_space *mapping = inode->i_mapping;
        struct page *page;
        void *fsdata;
        int err;
        char *kaddr;
+       unsigned int flags = AOP_FLAG_UNINTERRUPTIBLE;
+       if (nofs)
+               flags |= AOP_FLAG_NOFS;
 
 retry:
        err = pagecache_write_begin(NULL, mapping, 0, len-1,
-                               AOP_FLAG_UNINTERRUPTIBLE, &page, &fsdata);
+                               flags, &page, &fsdata);
        if (err)
                goto fail;
 
@@ -2833,7 +2836,7 @@ fail:
 int page_symlink(struct inode *inode, const char *symname, int len)
 {
        return __page_symlink(inode, symname, len,
-                       mapping_gfp_mask(inode->i_mapping));
+                       !(mapping_gfp_mask(inode->i_mapping) & __GFP_FS));
 }
 
 const struct inode_operations page_symlink_inode_operations = {