Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 418 insertions, 0 deletions

diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
new file mode 100644
index 000000000000..3176b3d3ffa8
--- /dev/null
+++ b/fs/ext2/namei.c
@@ -0,0 +1,418 @@
+/*
+ * linux/fs/ext2/namei.c
+ *
+ * Rewrite to pagecache. Almost all code had been changed, so blame me
+ * if the things go wrong. Please, send bug reports to
+ * viro@parcelfarce.linux.theplanet.co.uk
+ *
+ * Stuff here is basically a glue between the VFS and generic UNIXish
+ * filesystem that keeps everything in pagecache. All knowledge of the
+ * directory layout is in fs/ext2/dir.c - it turned out to be easily separatable
+ * and it's easier to debug that way. In principle we might want to
+ * generalize that a bit and turn it into a library. Or not.
+ *
+ * The only non-static object here is ext2_dir_inode_operations.
+ *
+ * TODO: get rid of kmap() use, add readahead.
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  from
+ *
+ *  linux/fs/minix/namei.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  Big-endian to little-endian byte-swapping/bitmaps by
+ *        David S. Miller (davem@caip.rutgers.edu), 1995
+ */
+
+#include <linux/pagemap.h>
+#include "ext2.h"
+#include "xattr.h"
+#include "acl.h"
+
+/*
+ * Couple of helper functions - make the code slightly cleaner.
+ */
+
+static inline void ext2_inc_count(struct inode *inode)
+{
+        inode->i_nlink++;
+        mark_inode_dirty(inode);
+}
+
+static inline void ext2_dec_count(struct inode *inode)
+{
+        inode->i_nlink--;
+        mark_inode_dirty(inode);
+}
+
+static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
+{
+        int err = ext2_add_link(dentry, inode);
+        if (!err) {
+                d_instantiate(dentry, inode);
+                return 0;
+        }
+        ext2_dec_count(inode);
+        iput(inode);
+        return err;
+}
+
+/*
+ * Methods themselves.
+ */
+
+static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
+{
+        struct inode * inode;
+        ino_t ino;
+        
+        if (dentry->d_name.len > EXT2_NAME_LEN)
+                return ERR_PTR(-ENAMETOOLONG);
+
+        ino = ext2_inode_by_name(dir, dentry);
+        inode = NULL;
+        if (ino) {
+                inode = iget(dir->i_sb, ino);
+                if (!inode)
+                        return ERR_PTR(-EACCES);
+        }
+        if (inode)
+                return d_splice_alias(inode, dentry);
+        d_add(dentry, inode);
+        return NULL;
+}
+
+struct dentry *ext2_get_parent(struct dentry *child)
+{
+        unsigned long ino;
+        struct dentry *parent;
+        struct inode *inode;
+        struct dentry dotdot;
+
+        dotdot.d_name.name = "..";
+        dotdot.d_name.len = 2;
+
+        ino = ext2_inode_by_name(child->d_inode, &dotdot);
+        if (!ino)
+                return ERR_PTR(-ENOENT);
+        inode = iget(child->d_inode->i_sb, ino);
+
+        if (!inode)
+                return ERR_PTR(-EACCES);
+        parent = d_alloc_anon(inode);
+        if (!parent) {
+                iput(inode);
+                parent = ERR_PTR(-ENOMEM);
+        }
+        return parent;
+} 
+
+/*
+ * By the time this is called, we already have created
+ * the directory cache entry for the new file, but it
+ * is so far negative - it has no inode.
+ *
+ * If the create succeeds, we fill in the inode information
+ * with d_instantiate(). 
+ */
+static int ext2_create (struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd)
+{
+        struct inode * inode = ext2_new_inode (dir, mode);
+        int err = PTR_ERR(inode);
+        if (!IS_ERR(inode)) {
+                inode->i_op = &ext2_file_inode_operations;
+                inode->i_fop = &ext2_file_operations;
+                if (test_opt(inode->i_sb, NOBH))
+                        inode->i_mapping->a_ops = &ext2_nobh_aops;
+                else
+                        inode->i_mapping->a_ops = &ext2_aops;
+                mark_inode_dirty(inode);
+                err = ext2_add_nondir(dentry, inode);
+        }
+        return err;
+}
+
+static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
+{
+        struct inode * inode;
+        int err;
+
+        if (!new_valid_dev(rdev))
+                return -EINVAL;
+
+        inode = ext2_new_inode (dir, mode);
+        err = PTR_ERR(inode);
+        if (!IS_ERR(inode)) {
+                init_special_inode(inode, inode->i_mode, rdev);
+#ifdef CONFIG_EXT2_FS_XATTR
+                inode->i_op = &ext2_special_inode_operations;
+#endif
+                mark_inode_dirty(inode);
+                err = ext2_add_nondir(dentry, inode);
+        }
+        return err;
+}
+
+static int ext2_symlink (struct inode * dir, struct dentry * dentry,
+        const char * symname)
+{
+        struct super_block * sb = dir->i_sb;
+        int err = -ENAMETOOLONG;
+        unsigned l = strlen(symname)+1;
+        struct inode * inode;
+
+        if (l > sb->s_blocksize)
+                goto out;
+
+        inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO);
+        err = PTR_ERR(inode);
+        if (IS_ERR(inode))
+                goto out;
+
+        if (l > sizeof (EXT2_I(inode)->i_data)) {
+                /* slow symlink */
+                inode->i_op = &ext2_symlink_inode_operations;
+                if (test_opt(inode->i_sb, NOBH))
+                        inode->i_mapping->a_ops = &ext2_nobh_aops;
+                else
+                        inode->i_mapping->a_ops = &ext2_aops;
+                err = page_symlink(inode, symname, l);
+                if (err)
+                        goto out_fail;
+        } else {
+                /* fast symlink */
+                inode->i_op = &ext2_fast_symlink_inode_operations;
+                memcpy((char*)(EXT2_I(inode)->i_data),symname,l);
+                inode->i_size = l-1;
+        }
+        mark_inode_dirty(inode);
+
+        err = ext2_add_nondir(dentry, inode);
+out:
+        return err;
+
+out_fail:
+        ext2_dec_count(inode);
+        iput (inode);
+        goto out;
+}
+
+static int ext2_link (struct dentry * old_dentry, struct inode * dir,
+        struct dentry *dentry)
+{
+        struct inode *inode = old_dentry->d_inode;
+
+        if (inode->i_nlink >= EXT2_LINK_MAX)
+                return -EMLINK;
+
+        inode->i_ctime = CURRENT_TIME_SEC;
+        ext2_inc_count(inode);
+        atomic_inc(&inode->i_count);
+
+        return ext2_add_nondir(dentry, inode);
+}
+
+static int ext2_mkdir(struct inode * dir, struct dentry * dentry, int mode)
+{
+        struct inode * inode;
+        int err = -EMLINK;
+
+        if (dir->i_nlink >= EXT2_LINK_MAX)
+                goto out;
+
+        ext2_inc_count(dir);
+
+        inode = ext2_new_inode (dir, S_IFDIR | mode);
+        err = PTR_ERR(inode);
+        if (IS_ERR(inode))
+                goto out_dir;
+
+        inode->i_op = &ext2_dir_inode_operations;
+        inode->i_fop = &ext2_dir_operations;
+        if (test_opt(inode->i_sb, NOBH))
+                inode->i_mapping->a_ops = &ext2_nobh_aops;
+        else
+                inode->i_mapping->a_ops = &ext2_aops;
+
+        ext2_inc_count(inode);
+
+        err = ext2_make_empty(inode, dir);
+        if (err)
+                goto out_fail;
+
+        err = ext2_add_link(dentry, inode);
+        if (err)
+                goto out_fail;
+
+        d_instantiate(dentry, inode);
+out:
+        return err;
+
+out_fail:
+        ext2_dec_count(inode);
+        ext2_dec_count(inode);
+        iput(inode);
+out_dir:
+        ext2_dec_count(dir);
+        goto out;
+}
+
+static int ext2_unlink(struct inode * dir, struct dentry *dentry)
+{
+        struct inode * inode = dentry->d_inode;
+        struct ext2_dir_entry_2 * de;
+        struct page * page;
+        int err = -ENOENT;
+
+        de = ext2_find_entry (dir, dentry, &page);
+        if (!de)
+                goto out;
+
+        err = ext2_delete_entry (de, page);
+        if (err)
+                goto out;
+
+        inode->i_ctime = dir->i_ctime;
+        ext2_dec_count(inode);
+        err = 0;
+out:
+        return err;
+}
+
+static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
+{
+        struct inode * inode = dentry->d_inode;
+        int err = -ENOTEMPTY;
+
+        if (ext2_empty_dir(inode)) {
+                err = ext2_unlink(dir, dentry);
+                if (!err) {
+                        inode->i_size = 0;
+                        ext2_dec_count(inode);
+                        ext2_dec_count(dir);
+                }
+        }
+        return err;
+}
+
+static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
+        struct inode * new_dir, struct dentry * new_dentry )
+{
+        struct inode * old_inode = old_dentry->d_inode;
+        struct inode * new_inode = new_dentry->d_inode;
+        struct page * dir_page = NULL;
+        struct ext2_dir_entry_2 * dir_de = NULL;
+        struct page * old_page;
+        struct ext2_dir_entry_2 * old_de;
+        int err = -ENOENT;
+
+        old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
+        if (!old_de)
+                goto out;
+
+        if (S_ISDIR(old_inode->i_mode)) {
+                err = -EIO;
+                dir_de = ext2_dotdot(old_inode, &dir_page);
+                if (!dir_de)
+                        goto out_old;
+        }
+
+        if (new_inode) {
+                struct page *new_page;
+                struct ext2_dir_entry_2 *new_de;
+
+                err = -ENOTEMPTY;
+                if (dir_de && !ext2_empty_dir (new_inode))
+                        goto out_dir;
+
+                err = -ENOENT;
+                new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
+                if (!new_de)
+                        goto out_dir;
+                ext2_inc_count(old_inode);
+                ext2_set_link(new_dir, new_de, new_page, old_inode);
+                new_inode->i_ctime = CURRENT_TIME_SEC;
+                if (dir_de)
+                        new_inode->i_nlink--;
+                ext2_dec_count(new_inode);
+        } else {
+                if (dir_de) {
+                        err = -EMLINK;
+                        if (new_dir->i_nlink >= EXT2_LINK_MAX)
+                                goto out_dir;
+                }
+                ext2_inc_count(old_inode);
+                err = ext2_add_link(new_dentry, old_inode);
+                if (err) {
+                        ext2_dec_count(old_inode);
+                        goto out_dir;
+                }
+                if (dir_de)
+                        ext2_inc_count(new_dir);
+        }
+
+        /*
+         * Like most other Unix systems, set the ctime for inodes on a
+         * rename.
+         * ext2_dec_count() will mark the inode dirty.
+         */
+        old_inode->i_ctime = CURRENT_TIME_SEC;
+
+        ext2_delete_entry (old_de, old_page);
+        ext2_dec_count(old_inode);
+
+        if (dir_de) {
+                ext2_set_link(old_inode, dir_de, dir_page, new_dir);
+                ext2_dec_count(old_dir);
+        }
+        return 0;
+
+
+out_dir:
+        if (dir_de) {
+                kunmap(dir_page);
+                page_cache_release(dir_page);
+        }
+out_old:
+        kunmap(old_page);
+        page_cache_release(old_page);
+out:
+        return err;
+}
+
+struct inode_operations ext2_dir_inode_operations = {
+        .create         = ext2_create,
+        .lookup         = ext2_lookup,
+        .link           = ext2_link,
+        .unlink         = ext2_unlink,
+        .symlink        = ext2_symlink,
+        .mkdir          = ext2_mkdir,
+        .rmdir          = ext2_rmdir,
+        .mknod          = ext2_mknod,
+        .rename         = ext2_rename,
+#ifdef CONFIG_EXT2_FS_XATTR
+        .setxattr       = generic_setxattr,
+        .getxattr       = generic_getxattr,
+        .listxattr      = ext2_listxattr,
+        .removexattr    = generic_removexattr,
+#endif
+        .setattr        = ext2_setattr,
+        .permission     = ext2_permission,
+};
+
+struct inode_operations ext2_special_inode_operations = {
+#ifdef CONFIG_EXT2_FS_XATTR
+        .setxattr       = generic_setxattr,
+        .getxattr       = generic_getxattr,
+        .listxattr      = ext2_listxattr,
+        .removexattr    = generic_removexattr,
+#endif
+        .setattr        = ext2_setattr,
+        .permission     = ext2_permission,
+};