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, 388 insertions, 0 deletions

diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c
new file mode 100644
index 000000000000..69a085abad6f
--- /dev/null
+++ b/fs/sysv/dir.c
@@ -0,0 +1,388 @@
+/*
+ *  linux/fs/sysv/dir.c
+ *
+ *  minix/dir.c
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  coh/dir.c
+ *  Copyright (C) 1993  Pascal Haible, Bruno Haible
+ *
+ *  sysv/dir.c
+ *  Copyright (C) 1993  Bruno Haible
+ *
+ *  SystemV/Coherent directory handling functions
+ */
+
+#include <linux/pagemap.h>
+#include <linux/highmem.h>
+#include <linux/smp_lock.h>
+#include "sysv.h"
+
+static int sysv_readdir(struct file *, void *, filldir_t);
+
+struct file_operations sysv_dir_operations = {
+        .read           = generic_read_dir,
+        .readdir        = sysv_readdir,
+        .fsync          = sysv_sync_file,
+};
+
+static inline void dir_put_page(struct page *page)
+{
+        kunmap(page);
+        page_cache_release(page);
+}
+
+static inline unsigned long dir_pages(struct inode *inode)
+{
+        return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
+}
+
+static int dir_commit_chunk(struct page *page, unsigned from, unsigned to)
+{
+        struct inode *dir = (struct inode *)page->mapping->host;
+        int err = 0;
+
+        page->mapping->a_ops->commit_write(NULL, page, from, to);
+        if (IS_DIRSYNC(dir))
+                err = write_one_page(page, 1);
+        else
+                unlock_page(page);
+        return err;
+}
+
+static struct page * dir_get_page(struct inode *dir, unsigned long n)
+{
+        struct address_space *mapping = dir->i_mapping;
+        struct page *page = read_cache_page(mapping, n,
+                                (filler_t*)mapping->a_ops->readpage, NULL);
+        if (!IS_ERR(page)) {
+                wait_on_page_locked(page);
+                kmap(page);
+                if (!PageUptodate(page))
+                        goto fail;
+        }
+        return page;
+
+fail:
+        dir_put_page(page);
+        return ERR_PTR(-EIO);
+}
+
+static int sysv_readdir(struct file * filp, void * dirent, filldir_t filldir)
+{
+        unsigned long pos = filp->f_pos;
+        struct inode *inode = filp->f_dentry->d_inode;
+        struct super_block *sb = inode->i_sb;
+        unsigned offset = pos & ~PAGE_CACHE_MASK;
+        unsigned long n = pos >> PAGE_CACHE_SHIFT;
+        unsigned long npages = dir_pages(inode);
+
+        lock_kernel();
+
+        pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);
+        if (pos >= inode->i_size)
+                goto done;
+
+        for ( ; n < npages; n++, offset = 0) {
+                char *kaddr, *limit;
+                struct sysv_dir_entry *de;
+                struct page *page = dir_get_page(inode, n);
+
+                if (IS_ERR(page))
+                        continue;
+                kaddr = (char *)page_address(page);
+                de = (struct sysv_dir_entry *)(kaddr+offset);
+                limit = kaddr + PAGE_CACHE_SIZE - SYSV_DIRSIZE;
+                for ( ;(char*)de <= limit; de++) {
+                        char *name = de->name;
+                        int over;
+
+                        if (!de->inode)
+                                continue;
+
+                        offset = (char *)de - kaddr;
+
+                        over = filldir(dirent, name, strnlen(name,SYSV_NAMELEN),
+                                        (n<<PAGE_CACHE_SHIFT) | offset,
+                                        fs16_to_cpu(SYSV_SB(sb), de->inode),
+                                        DT_UNKNOWN);
+                        if (over) {
+                                dir_put_page(page);
+                                goto done;
+                        }
+                }
+                dir_put_page(page);
+        }
+
+done:
+        filp->f_pos = (n << PAGE_CACHE_SHIFT) | offset;
+        unlock_kernel();
+        return 0;
+}
+
+/* compare strings: name[0..len-1] (not zero-terminated) and
+ * buffer[0..] (filled with zeroes up to buffer[0..maxlen-1])
+ */
+static inline int namecompare(int len, int maxlen,
+        const char * name, const char * buffer)
+{
+        if (len < maxlen && buffer[len])
+                return 0;
+        return !memcmp(name, buffer, len);
+}
+
+/*
+ *      sysv_find_entry()
+ *
+ * finds an entry in the specified directory with the wanted name. It
+ * returns the cache buffer in which the entry was found, and the entry
+ * itself (as a parameter - res_dir). It does NOT read the inode of the
+ * entry - you'll have to do that yourself if you want to.
+ */
+struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_page)
+{
+        const char * name = dentry->d_name.name;
+        int namelen = dentry->d_name.len;
+        struct inode * dir = dentry->d_parent->d_inode;
+        unsigned long start, n;
+        unsigned long npages = dir_pages(dir);
+        struct page *page = NULL;
+        struct sysv_dir_entry *de;
+
+        *res_page = NULL;
+
+        start = SYSV_I(dir)->i_dir_start_lookup;
+        if (start >= npages)
+                start = 0;
+        n = start;
+
+        do {
+                char *kaddr;
+                page = dir_get_page(dir, n);
+                if (!IS_ERR(page)) {
+                        kaddr = (char*)page_address(page);
+                        de = (struct sysv_dir_entry *) kaddr;
+                        kaddr += PAGE_CACHE_SIZE - SYSV_DIRSIZE;
+                        for ( ; (char *) de <= kaddr ; de++) {
+                                if (!de->inode)
+                                        continue;
+                                if (namecompare(namelen, SYSV_NAMELEN,
+                                                        name, de->name))
+                                        goto found;
+                        }
+                }
+                dir_put_page(page);
+
+                if (++n >= npages)
+                        n = 0;
+        } while (n != start);
+
+        return NULL;
+
+found:
+        SYSV_I(dir)->i_dir_start_lookup = n;
+        *res_page = page;
+        return de;
+}
+
+int sysv_add_link(struct dentry *dentry, struct inode *inode)
+{
+        struct inode *dir = dentry->d_parent->d_inode;
+        const char * name = dentry->d_name.name;
+        int namelen = dentry->d_name.len;
+        struct page *page = NULL;
+        struct sysv_dir_entry * de;
+        unsigned long npages = dir_pages(dir);
+        unsigned long n;
+        char *kaddr;
+        unsigned from, to;
+        int err;
+
+        /* We take care of directory expansion in the same loop */
+        for (n = 0; n <= npages; n++) {
+                page = dir_get_page(dir, n);
+                err = PTR_ERR(page);
+                if (IS_ERR(page))
+                        goto out;
+                kaddr = (char*)page_address(page);
+                de = (struct sysv_dir_entry *)kaddr;
+                kaddr += PAGE_CACHE_SIZE - SYSV_DIRSIZE;
+                while ((char *)de <= kaddr) {
+                        if (!de->inode)
+                                goto got_it;
+                        err = -EEXIST;
+                        if (namecompare(namelen, SYSV_NAMELEN, name, de->name)) 
+                                goto out_page;
+                        de++;
+                }
+                dir_put_page(page);
+        }
+        BUG();
+        return -EINVAL;
+
+got_it:
+        from = (char*)de - (char*)page_address(page);
+        to = from + SYSV_DIRSIZE;
+        lock_page(page);
+        err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
+        if (err)
+                goto out_unlock;
+        memcpy (de->name, name, namelen);
+        memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);
+        de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
+        err = dir_commit_chunk(page, from, to);
+        dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+        mark_inode_dirty(dir);
+out_page:
+        dir_put_page(page);
+out:
+        return err;
+out_unlock:
+        unlock_page(page);
+        goto out_page;
+}
+
+int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page)
+{
+        struct address_space *mapping = page->mapping;
+        struct inode *inode = (struct inode*)mapping->host;
+        char *kaddr = (char*)page_address(page);
+        unsigned from = (char*)de - kaddr;
+        unsigned to = from + SYSV_DIRSIZE;
+        int err;
+
+        lock_page(page);
+        err = mapping->a_ops->prepare_write(NULL, page, from, to);
+        if (err)
+                BUG();
+        de->inode = 0;
+        err = dir_commit_chunk(page, from, to);
+        dir_put_page(page);
+        inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+        mark_inode_dirty(inode);
+        return err;
+}
+
+int sysv_make_empty(struct inode *inode, struct inode *dir)
+{
+        struct address_space *mapping = inode->i_mapping;
+        struct page *page = grab_cache_page(mapping, 0);
+        struct sysv_dir_entry * de;
+        char *base;
+        int err;
+
+        if (!page)
+                return -ENOMEM;
+        kmap(page);
+        err = mapping->a_ops->prepare_write(NULL, page, 0, 2 * SYSV_DIRSIZE);
+        if (err) {
+                unlock_page(page);
+                goto fail;
+        }
+
+        base = (char*)page_address(page);
+        memset(base, 0, PAGE_CACHE_SIZE);
+
+        de = (struct sysv_dir_entry *) base;
+        de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
+        strcpy(de->name,".");
+        de++;
+        de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);
+        strcpy(de->name,"..");
+
+        err = dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
+fail:
+        kunmap(page);
+        page_cache_release(page);
+        return err;
+}
+
+/*
+ * routine to check that the specified directory is empty (for rmdir)
+ */
+int sysv_empty_dir(struct inode * inode)
+{
+        struct super_block *sb = inode->i_sb;
+        struct page *page = NULL;
+        unsigned long i, npages = dir_pages(inode);
+
+        for (i = 0; i < npages; i++) {
+                char *kaddr;
+                struct sysv_dir_entry * de;
+                page = dir_get_page(inode, i);
+
+                if (IS_ERR(page))
+                        continue;
+
+                kaddr = (char *)page_address(page);
+                de = (struct sysv_dir_entry *)kaddr;
+                kaddr += PAGE_CACHE_SIZE-SYSV_DIRSIZE;
+
+                for ( ;(char *)de <= kaddr; de++) {
+                        if (!de->inode)
+                                continue;
+                        /* check for . and .. */
+                        if (de->name[0] != '.')
+                                goto not_empty;
+                        if (!de->name[1]) {
+                                if (de->inode == cpu_to_fs16(SYSV_SB(sb),
+                                                        inode->i_ino))
+                                        continue;
+                                goto not_empty;
+                        }
+                        if (de->name[1] != '.' || de->name[2])
+                                goto not_empty;
+                }
+                dir_put_page(page);
+        }
+        return 1;
+
+not_empty:
+        dir_put_page(page);
+        return 0;
+}
+
+/* Releases the page */
+void sysv_set_link(struct sysv_dir_entry *de, struct page *page,
+        struct inode *inode)
+{
+        struct inode *dir = (struct inode*)page->mapping->host;
+        unsigned from = (char *)de-(char*)page_address(page);
+        unsigned to = from + SYSV_DIRSIZE;
+        int err;
+
+        lock_page(page);
+        err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
+        if (err)
+                BUG();
+        de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
+        err = dir_commit_chunk(page, from, to);
+        dir_put_page(page);
+        dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+        mark_inode_dirty(dir);
+}
+
+struct sysv_dir_entry * sysv_dotdot (struct inode *dir, struct page **p)
+{
+        struct page *page = dir_get_page(dir, 0);
+        struct sysv_dir_entry *de = NULL;
+
+        if (!IS_ERR(page)) {
+                de = (struct sysv_dir_entry*) page_address(page) + 1;
+                *p = page;
+        }
+        return de;
+}
+
+ino_t sysv_inode_by_name(struct dentry *dentry)
+{
+        struct page *page;
+        struct sysv_dir_entry *de = sysv_find_entry (dentry, &page);
+        ino_t res = 0;
+        
+        if (de) {
+                res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);
+                dir_put_page(page);
+        }
+        return res;
+}