* regular file handling primitives for fat-based filesystems
*/
+#include <linux/capability.h>
#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;
-}
+#include <linux/writeback.h>
int fat_generic_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
if (err)
return err;
- down(&inode->i_sem);
+ mutex_lock(&inode->i_mutex);
if (IS_RDONLY(inode)) {
err = -EROFS;
MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
mark_inode_dirty(inode);
up:
- up(&inode->i_sem);
+ mutex_unlock(&inode->i_mutex);
return err;
}
default:
}
}
-struct file_operations fat_file_operations = {
+const 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,
+ .writev = generic_file_writev,
.aio_read = generic_file_aio_read,
- .aio_write = fat_file_aio_write,
+ .aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.ioctl = fat_generic_ioctl,
.fsync = file_fsync,
.sendfile = generic_file_sendfile,
};
+static int fat_cont_expand(struct inode *inode, loff_t size)
+{
+ struct address_space *mapping = inode->i_mapping;
+ loff_t start = inode->i_size, count = size - inode->i_size;
+ int err;
+
+ err = generic_cont_expand_simple(inode, size);
+ if (err)
+ goto out;
+
+ inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+ mark_inode_dirty(inode);
+ if (IS_SYNC(inode))
+ err = sync_page_range_nolock(inode, mapping, start, count);
+out:
+ return err;
+}
+
int fat_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
lock_kernel();
- /* FAT cannot truncate to a longer file */
+ /*
+ * Expand the file. Since inode_setattr() updates ->i_size
+ * before calling the ->truncate(), but FAT needs to fill the
+ * hole before it.
+ */
if (attr->ia_valid & ATTR_SIZE) {
if (attr->ia_size > inode->i_size) {
- error = -EPERM;
- goto out;
+ error = fat_cont_expand(inode, attr->ia_size);
+ if (error || attr->ia_valid == ATTR_SIZE)
+ goto out;
+ attr->ia_valid &= ~ATTR_SIZE;
}
}
return error;
}
-EXPORT_SYMBOL(fat_notify_change);
+EXPORT_SYMBOL_GPL(fat_notify_change);
/* Free all clusters after the skip'th cluster. */
static int fat_free(struct inode *inode, int skip)
if (MSDOS_I(inode)->i_start == 0)
return 0;
- /*
- * Write a new EOF, and get the remaining cluster chain for freeing.
- */
+ fat_cache_inval_inode(inode);
+
wait = IS_DIRSYNC(inode);
+ i_start = free_start = MSDOS_I(inode)->i_start;
+ i_logstart = MSDOS_I(inode)->i_logstart;
+
+ /* First, we write the new file size. */
+ if (!skip) {
+ 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) {
+ MSDOS_I(inode)->i_start = i_start;
+ MSDOS_I(inode)->i_logstart = i_logstart;
+ return err;
+ }
+ } else
+ mark_inode_dirty(inode);
+
+ /* Write a new EOF, and get the remaining cluster chain for freeing. */
if (skip) {
struct fat_entry fatent;
int ret, fclus, dclus;
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)
git://git.onelab.eu / linux-2.6.git / blobdiff