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, 308 insertions, 0 deletions

diff --git a/fs/fat/file.c b/fs/fat/file.c
new file mode 100644
index 000000000000..62ffa9139400
--- /dev/null
+++ b/fs/fat/file.c
@@ -0,0 +1,308 @@
+/*
+ *  linux/fs/fat/file.c
+ *
+ *  Written 1992,1993 by Werner Almesberger
+ *
+ *  regular file handling primitives for fat-based filesystems
+ */
+
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/msdos_fs.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+
+static ssize_t fat_file_aio_write(struct kiocb *iocb, const char __user *buf,
+                                  size_t count, loff_t pos)
+{
+        struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
+        int retval;
+
+        retval = generic_file_aio_write(iocb, buf, count, pos);
+        if (retval > 0) {
+                inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+                MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
+                mark_inode_dirty(inode);
+//              check the locking rules
+//              if (IS_SYNC(inode))
+//                      fat_sync_inode(inode);
+        }
+        return retval;
+}
+
+static ssize_t fat_file_writev(struct file *filp, const struct iovec *iov,
+                               unsigned long nr_segs, loff_t *ppos)
+{
+        struct inode *inode = filp->f_dentry->d_inode;
+        int retval;
+
+        retval = generic_file_writev(filp, iov, nr_segs, ppos);
+        if (retval > 0) {
+                inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+                MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
+                mark_inode_dirty(inode);
+        }
+        return retval;
+}
+
+int fat_generic_ioctl(struct inode *inode, struct file *filp,
+                      unsigned int cmd, unsigned long arg)
+{
+        struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+        u32 __user *user_attr = (u32 __user *)arg;
+
+        switch (cmd) {
+        case FAT_IOCTL_GET_ATTRIBUTES:
+        {
+                u32 attr;
+
+                if (inode->i_ino == MSDOS_ROOT_INO)
+                        attr = ATTR_DIR;
+                else
+                        attr = fat_attr(inode);
+
+                return put_user(attr, user_attr);
+        }
+        case FAT_IOCTL_SET_ATTRIBUTES:
+        {
+                u32 attr, oldattr;
+                int err, is_dir = S_ISDIR(inode->i_mode);
+                struct iattr ia;
+
+                err = get_user(attr, user_attr);
+                if (err)
+                        return err;
+
+                down(&inode->i_sem);
+
+                if (IS_RDONLY(inode)) {
+                        err = -EROFS;
+                        goto up;
+                }
+
+                /*
+                 * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
+                 * prevents the user from turning us into a VFAT
+                 * longname entry.  Also, we obviously can't set
+                 * any of the NTFS attributes in the high 24 bits.
+                 */
+                attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
+                /* Merge in ATTR_VOLUME and ATTR_DIR */
+                attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
+                        (is_dir ? ATTR_DIR : 0);
+                oldattr = fat_attr(inode);
+
+                /* Equivalent to a chmod() */
+                ia.ia_valid = ATTR_MODE | ATTR_CTIME;
+                if (is_dir) {
+                        ia.ia_mode = MSDOS_MKMODE(attr,
+                                S_IRWXUGO & ~sbi->options.fs_dmask)
+                                | S_IFDIR;
+                } else {
+                        ia.ia_mode = MSDOS_MKMODE(attr,
+                                (S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO))
+                                & ~sbi->options.fs_fmask)
+                                | S_IFREG;
+                }
+
+                /* The root directory has no attributes */
+                if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
+                        err = -EINVAL;
+                        goto up;
+                }
+
+                if (sbi->options.sys_immutable) {
+                        if ((attr | oldattr) & ATTR_SYS) {
+                                if (!capable(CAP_LINUX_IMMUTABLE)) {
+                                        err = -EPERM;
+                                        goto up;
+                                }
+                        }
+                }
+
+                /* This MUST be done before doing anything irreversible... */
+                err = notify_change(filp->f_dentry, &ia);
+                if (err)
+                        goto up;
+
+                if (sbi->options.sys_immutable) {
+                        if (attr & ATTR_SYS)
+                                inode->i_flags |= S_IMMUTABLE;
+                        else
+                                inode->i_flags &= S_IMMUTABLE;
+                }
+
+                MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
+                mark_inode_dirty(inode);
+        up:
+                up(&inode->i_sem);
+                return err;
+        }
+        default:
+                return -ENOTTY; /* Inappropriate ioctl for device */
+        }
+}
+
+struct file_operations fat_file_operations = {
+        .llseek         = generic_file_llseek,
+        .read           = do_sync_read,
+        .write          = do_sync_write,
+        .readv          = generic_file_readv,
+        .writev         = fat_file_writev,
+        .aio_read       = generic_file_aio_read,
+        .aio_write      = fat_file_aio_write,
+        .mmap           = generic_file_mmap,
+        .ioctl          = fat_generic_ioctl,
+        .fsync          = file_fsync,
+        .sendfile       = generic_file_sendfile,
+};
+
+int fat_notify_change(struct dentry *dentry, struct iattr *attr)
+{
+        struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
+        struct inode *inode = dentry->d_inode;
+        int mask, error = 0;
+
+        lock_kernel();
+
+        /* FAT cannot truncate to a longer file */
+        if (attr->ia_valid & ATTR_SIZE) {
+                if (attr->ia_size > inode->i_size) {
+                        error = -EPERM;
+                        goto out;
+                }
+        }
+
+        error = inode_change_ok(inode, attr);
+        if (error) {
+                if (sbi->options.quiet)
+                        error = 0;
+                goto out;
+        }
+        if (((attr->ia_valid & ATTR_UID) &&
+             (attr->ia_uid != sbi->options.fs_uid)) ||
+            ((attr->ia_valid & ATTR_GID) &&
+             (attr->ia_gid != sbi->options.fs_gid)) ||
+            ((attr->ia_valid & ATTR_MODE) &&
+             (attr->ia_mode & ~MSDOS_VALID_MODE)))
+                error = -EPERM;
+
+        if (error) {
+                if (sbi->options.quiet)
+                        error = 0;
+                goto out;
+        }
+        error = inode_setattr(inode, attr);
+        if (error)
+                goto out;
+
+        if (S_ISDIR(inode->i_mode))
+                mask = sbi->options.fs_dmask;
+        else
+                mask = sbi->options.fs_fmask;
+        inode->i_mode &= S_IFMT | (S_IRWXUGO & ~mask);
+out:
+        unlock_kernel();
+        return error;
+}
+
+EXPORT_SYMBOL(fat_notify_change);
+
+/* Free all clusters after the skip'th cluster. */
+static int fat_free(struct inode *inode, int skip)
+{
+        struct super_block *sb = inode->i_sb;
+        int err, wait, free_start, i_start, i_logstart;
+
+        if (MSDOS_I(inode)->i_start == 0)
+                return 0;
+
+        /*
+         * Write a new EOF, and get the remaining cluster chain for freeing.
+         */
+        wait = IS_DIRSYNC(inode);
+        if (skip) {
+                struct fat_entry fatent;
+                int ret, fclus, dclus;
+
+                ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus);
+                if (ret < 0)
+                        return ret;
+                else if (ret == FAT_ENT_EOF)
+                        return 0;
+
+                fatent_init(&fatent);
+                ret = fat_ent_read(inode, &fatent, dclus);
+                if (ret == FAT_ENT_EOF) {
+                        fatent_brelse(&fatent);
+                        return 0;
+                } else if (ret == FAT_ENT_FREE) {
+                        fat_fs_panic(sb,
+                                     "%s: invalid cluster chain (i_pos %lld)",
+                                     __FUNCTION__, MSDOS_I(inode)->i_pos);
+                        ret = -EIO;
+                } else if (ret > 0) {
+                        err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait);
+                        if (err)
+                                ret = err;
+                }
+                fatent_brelse(&fatent);
+                if (ret < 0)
+                        return ret;
+
+                free_start = ret;
+                i_start = i_logstart = 0;
+                fat_cache_inval_inode(inode);
+        } else {
+                fat_cache_inval_inode(inode);
+
+                i_start = free_start = MSDOS_I(inode)->i_start;
+                i_logstart = MSDOS_I(inode)->i_logstart;
+                MSDOS_I(inode)->i_start = 0;
+                MSDOS_I(inode)->i_logstart = 0;
+        }
+        MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
+        inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+        if (wait) {
+                err = fat_sync_inode(inode);
+                if (err)
+                        goto error;
+        } else
+                mark_inode_dirty(inode);
+        inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
+
+        /* Freeing the remained cluster chain */
+        return fat_free_clusters(inode, free_start);
+
+error:
+        if (i_start) {
+                MSDOS_I(inode)->i_start = i_start;
+                MSDOS_I(inode)->i_logstart = i_logstart;
+        }
+        return err;
+}
+
+void fat_truncate(struct inode *inode)
+{
+        struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+        const unsigned int cluster_size = sbi->cluster_size;
+        int nr_clusters;
+
+        /*
+         * This protects against truncating a file bigger than it was then
+         * trying to write into the hole.
+         */
+        if (MSDOS_I(inode)->mmu_private > inode->i_size)
+                MSDOS_I(inode)->mmu_private = inode->i_size;
+
+        nr_clusters = (inode->i_size + (cluster_size - 1)) >> sbi->cluster_bits;
+
+        lock_kernel();
+        fat_free(inode, nr_clusters);
+        unlock_kernel();
+}
+
+struct inode_operations fat_file_inode_operations = {
+        .truncate       = fat_truncate,
+        .setattr        = fat_notify_change,
+};