*/
#include "ext2.h"
+#include <linux/buffer_head.h>
#include <linux/pagemap.h>
-#include <linux/smp_lock.h>
+#include <linux/swap.h>
typedef struct ext2_dir_entry_2 ext2_dirent;
+static inline unsigned ext2_rec_len_from_disk(__le16 dlen)
+{
+ unsigned len = le16_to_cpu(dlen);
+
+ if (len == EXT2_MAX_REC_LEN)
+ return 1 << 16;
+ return len;
+}
+
+static inline __le16 ext2_rec_len_to_disk(unsigned len)
+{
+ if (len == (1 << 16))
+ return cpu_to_le16(EXT2_MAX_REC_LEN);
+ else
+ BUG_ON(len > (1 << 16));
+ return cpu_to_le16(len);
+}
+
/*
* ext2 uses block-sized chunks. Arguably, sector-sized ones would be
* more robust, but we have what we have
return last_byte;
}
-static int ext2_commit_chunk(struct page *page, unsigned from, unsigned to)
+static int ext2_commit_chunk(struct page *page, loff_t pos, unsigned len)
{
- struct inode *dir = page->mapping->host;
+ struct address_space *mapping = page->mapping;
+ struct inode *dir = mapping->host;
int err = 0;
+
dir->i_version++;
- page->mapping->a_ops->commit_write(NULL, page, from, to);
- if (IS_DIRSYNC(dir))
+ block_write_end(NULL, mapping, pos, len, len, page, NULL);
+
+ if (pos+len > dir->i_size) {
+ i_size_write(dir, pos+len);
+ mark_inode_dirty(dir);
+ }
+
+ if (IS_DIRSYNC(dir)) {
err = write_one_page(page, 1);
- else
+ if (!err)
+ err = ext2_sync_inode(dir);
+ } else {
unlock_page(page);
+ }
+
return err;
}
-static void ext2_check_page(struct page *page)
+static void ext2_check_page(struct page *page, int quiet)
{
struct inode *dir = page->mapping->host;
struct super_block *sb = dir->i_sb;
}
for (offs = 0; offs <= limit - EXT2_DIR_REC_LEN(1); offs += rec_len) {
p = (ext2_dirent *)(kaddr + offs);
- rec_len = le16_to_cpu(p->rec_len);
+ rec_len = ext2_rec_len_from_disk(p->rec_len);
if (rec_len < EXT2_DIR_REC_LEN(1))
goto Eshort;
/* Too bad, we had an error */
Ebadsize:
- ext2_error(sb, "ext2_check_page",
- "size of directory #%lu is not a multiple of chunk size",
- dir->i_ino
- );
+ if (!quiet)
+ ext2_error(sb, __func__,
+ "size of directory #%lu is not a multiple "
+ "of chunk size", dir->i_ino);
goto fail;
Eshort:
error = "rec_len is smaller than minimal";
Einumber:
error = "inode out of bounds";
bad_entry:
- ext2_error (sb, "ext2_check_page", "bad entry in directory #%lu: %s - "
- "offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
- dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
- (unsigned long) le32_to_cpu(p->inode),
- rec_len, p->name_len);
+ if (!quiet)
+ ext2_error(sb, __func__, "bad entry in directory #%lu: : %s - "
+ "offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
+ dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
+ (unsigned long) le32_to_cpu(p->inode),
+ rec_len, p->name_len);
goto fail;
Eend:
- p = (ext2_dirent *)(kaddr + offs);
- ext2_error (sb, "ext2_check_page",
- "entry in directory #%lu spans the page boundary"
- "offset=%lu, inode=%lu",
- dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
- (unsigned long) le32_to_cpu(p->inode));
+ if (!quiet) {
+ p = (ext2_dirent *)(kaddr + offs);
+ ext2_error(sb, "ext2_check_page",
+ "entry in directory #%lu spans the page boundary"
+ "offset=%lu, inode=%lu",
+ dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
+ (unsigned long) le32_to_cpu(p->inode));
+ }
fail:
SetPageChecked(page);
SetPageError(page);
}
-static struct page * ext2_get_page(struct inode *dir, unsigned long n)
+static struct page * ext2_get_page(struct inode *dir, unsigned long n,
+ int quiet)
{
struct address_space *mapping = dir->i_mapping;
struct page *page = read_mapping_page(mapping, n, NULL);
if (!IS_ERR(page)) {
- wait_on_page_locked(page);
kmap(page);
- if (!PageUptodate(page))
- goto fail;
if (!PageChecked(page))
- ext2_check_page(page);
+ ext2_check_page(page, quiet);
if (PageError(page))
goto fail;
}
*/
static inline ext2_dirent *ext2_next_entry(ext2_dirent *p)
{
- return (ext2_dirent *)((char*)p + le16_to_cpu(p->rec_len));
+ return (ext2_dirent *)((char *)p +
+ ext2_rec_len_from_disk(p->rec_len));
}
static inline unsigned
ext2_readdir (struct file * filp, void * dirent, filldir_t filldir)
{
loff_t pos = filp->f_pos;
- struct inode *inode = filp->f_dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block *sb = inode->i_sb;
unsigned int offset = pos & ~PAGE_CACHE_MASK;
unsigned long n = pos >> PAGE_CACHE_SHIFT;
for ( ; n < npages; n++, offset = 0) {
char *kaddr, *limit;
ext2_dirent *de;
- struct page *page = ext2_get_page(inode, n);
+ struct page *page = ext2_get_page(inode, n, 0);
if (IS_ERR(page)) {
- ext2_error(sb, __FUNCTION__,
+ ext2_error(sb, __func__,
"bad page in #%lu",
inode->i_ino);
filp->f_pos += PAGE_CACHE_SIZE - offset;
- return -EIO;
+ return PTR_ERR(page);
}
kaddr = page_address(page);
if (unlikely(need_revalidate)) {
limit = kaddr + ext2_last_byte(inode, n) - EXT2_DIR_REC_LEN(1);
for ( ;(char*)de <= limit; de = ext2_next_entry(de)) {
if (de->rec_len == 0) {
- ext2_error(sb, __FUNCTION__,
+ ext2_error(sb, __func__,
"zero-length directory entry");
ext2_put_page(page);
return -EIO;
return 0;
}
}
- filp->f_pos += le16_to_cpu(de->rec_len);
+ filp->f_pos += ext2_rec_len_from_disk(de->rec_len);
}
ext2_put_page(page);
}
* ext2_find_entry()
*
* finds an entry in the specified directory with the wanted name. It
- * returns the page in which the entry was found, and the entry itself
- * (as a parameter - res_dir). Page is returned mapped and unlocked.
+ * returns the page in which the entry was found (as a parameter - res_page),
+ * and the entry itself. Page is returned mapped and unlocked.
* Entry is guaranteed to be valid.
*/
-struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
- struct dentry *dentry, struct page ** res_page)
+struct ext2_dir_entry_2 *ext2_find_entry (struct inode * dir,
+ struct qstr *child, struct page ** res_page)
{
- const char *name = dentry->d_name.name;
- int namelen = dentry->d_name.len;
+ const char *name = child->name;
+ int namelen = child->len;
unsigned reclen = EXT2_DIR_REC_LEN(namelen);
unsigned long start, n;
unsigned long npages = dir_pages(dir);
struct page *page = NULL;
struct ext2_inode_info *ei = EXT2_I(dir);
ext2_dirent * de;
+ int dir_has_error = 0;
if (npages == 0)
goto out;
n = start;
do {
char *kaddr;
- page = ext2_get_page(dir, n);
+ page = ext2_get_page(dir, n, dir_has_error);
if (!IS_ERR(page)) {
kaddr = page_address(page);
de = (ext2_dirent *) kaddr;
kaddr += ext2_last_byte(dir, n) - reclen;
while ((char *) de <= kaddr) {
if (de->rec_len == 0) {
- ext2_error(dir->i_sb, __FUNCTION__,
+ ext2_error(dir->i_sb, __func__,
"zero-length directory entry");
ext2_put_page(page);
goto out;
de = ext2_next_entry(de);
}
ext2_put_page(page);
- }
+ } else
+ dir_has_error = 1;
+
if (++n >= npages)
n = 0;
+ /* next page is past the blocks we've got */
+ if (unlikely(n > (dir->i_blocks >> (PAGE_CACHE_SHIFT - 9)))) {
+ ext2_error(dir->i_sb, __func__,
+ "dir %lu size %lld exceeds block count %llu",
+ dir->i_ino, dir->i_size,
+ (unsigned long long)dir->i_blocks);
+ goto out;
+ }
} while (n != start);
out:
return NULL;
struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p)
{
- struct page *page = ext2_get_page(dir, 0);
+ struct page *page = ext2_get_page(dir, 0, 0);
ext2_dirent *de = NULL;
if (!IS_ERR(page)) {
return de;
}
-ino_t ext2_inode_by_name(struct inode * dir, struct dentry *dentry)
+ino_t ext2_inode_by_name(struct inode *dir, struct qstr *child)
{
ino_t res = 0;
- struct ext2_dir_entry_2 * de;
+ struct ext2_dir_entry_2 *de;
struct page *page;
- de = ext2_find_entry (dir, dentry, &page);
+ de = ext2_find_entry (dir, child, &page);
if (de) {
res = le32_to_cpu(de->inode);
- kunmap(page);
- page_cache_release(page);
+ ext2_put_page(page);
}
return res;
}
/* Releases the page */
void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
- struct page *page, struct inode *inode)
+ struct page *page, struct inode *inode, int update_times)
{
- unsigned from = (char *) de - (char *) page_address(page);
- unsigned to = from + le16_to_cpu(de->rec_len);
+ loff_t pos = page_offset(page) +
+ (char *) de - (char *) page_address(page);
+ unsigned len = ext2_rec_len_from_disk(de->rec_len);
int err;
lock_page(page);
- err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
+ err = __ext2_write_begin(NULL, page->mapping, pos, len,
+ AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
BUG_ON(err);
de->inode = cpu_to_le32(inode->i_ino);
- ext2_set_de_type (de, inode);
- err = ext2_commit_chunk(page, from, to);
+ ext2_set_de_type(de, inode);
+ err = ext2_commit_chunk(page, pos, len);
ext2_put_page(page);
- dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
+ if (update_times)
+ dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
mark_inode_dirty(dir);
}
unsigned long npages = dir_pages(dir);
unsigned long n;
char *kaddr;
- unsigned from, to;
+ loff_t pos;
int err;
/*
for (n = 0; n <= npages; n++) {
char *dir_end;
- page = ext2_get_page(dir, n);
+ page = ext2_get_page(dir, n, 0);
err = PTR_ERR(page);
if (IS_ERR(page))
goto out;
/* We hit i_size */
name_len = 0;
rec_len = chunk_size;
- de->rec_len = cpu_to_le16(chunk_size);
+ de->rec_len = ext2_rec_len_to_disk(chunk_size);
de->inode = 0;
goto got_it;
}
if (de->rec_len == 0) {
- ext2_error(dir->i_sb, __FUNCTION__,
+ ext2_error(dir->i_sb, __func__,
"zero-length directory entry");
err = -EIO;
goto out_unlock;
if (ext2_match (namelen, name, de))
goto out_unlock;
name_len = EXT2_DIR_REC_LEN(de->name_len);
- rec_len = le16_to_cpu(de->rec_len);
+ rec_len = ext2_rec_len_from_disk(de->rec_len);
if (!de->inode && rec_len >= reclen)
goto got_it;
if (rec_len >= name_len + reclen)
return -EINVAL;
got_it:
- from = (char*)de - (char*)page_address(page);
- to = from + rec_len;
- err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
+ pos = page_offset(page) +
+ (char*)de - (char*)page_address(page);
+ err = __ext2_write_begin(NULL, page->mapping, pos, rec_len, 0,
+ &page, NULL);
if (err)
goto out_unlock;
if (de->inode) {
ext2_dirent *de1 = (ext2_dirent *) ((char *) de + name_len);
- de1->rec_len = cpu_to_le16(rec_len - name_len);
- de->rec_len = cpu_to_le16(name_len);
+ de1->rec_len = ext2_rec_len_to_disk(rec_len - name_len);
+ de->rec_len = ext2_rec_len_to_disk(name_len);
de = de1;
}
de->name_len = namelen;
- memcpy (de->name, name, namelen);
+ memcpy(de->name, name, namelen);
de->inode = cpu_to_le32(inode->i_ino);
ext2_set_de_type (de, inode);
- err = ext2_commit_chunk(page, from, to);
+ err = ext2_commit_chunk(page, pos, rec_len);
dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
EXT2_I(dir)->i_flags &= ~EXT2_BTREE_FL;
mark_inode_dirty(dir);
struct inode *inode = mapping->host;
char *kaddr = page_address(page);
unsigned from = ((char*)dir - kaddr) & ~(ext2_chunk_size(inode)-1);
- unsigned to = ((char*)dir - kaddr) + le16_to_cpu(dir->rec_len);
+ unsigned to = ((char *)dir - kaddr) +
+ ext2_rec_len_from_disk(dir->rec_len);
+ loff_t pos;
ext2_dirent * pde = NULL;
ext2_dirent * de = (ext2_dirent *) (kaddr + from);
int err;
while ((char*)de < (char*)dir) {
if (de->rec_len == 0) {
- ext2_error(inode->i_sb, __FUNCTION__,
+ ext2_error(inode->i_sb, __func__,
"zero-length directory entry");
err = -EIO;
goto out;
}
if (pde)
from = (char*)pde - (char*)page_address(page);
+ pos = page_offset(page) + from;
lock_page(page);
- err = mapping->a_ops->prepare_write(NULL, page, from, to);
+ err = __ext2_write_begin(NULL, page->mapping, pos, to - from, 0,
+ &page, NULL);
BUG_ON(err);
if (pde)
- pde->rec_len = cpu_to_le16(to-from);
+ pde->rec_len = ext2_rec_len_to_disk(to - from);
dir->inode = 0;
- err = ext2_commit_chunk(page, from, to);
+ err = ext2_commit_chunk(page, pos, to - from);
inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
EXT2_I(inode)->i_flags &= ~EXT2_BTREE_FL;
mark_inode_dirty(inode);
if (!page)
return -ENOMEM;
- err = mapping->a_ops->prepare_write(NULL, page, 0, chunk_size);
+
+ err = __ext2_write_begin(NULL, page->mapping, 0, chunk_size, 0,
+ &page, NULL);
if (err) {
unlock_page(page);
goto fail;
memset(kaddr, 0, chunk_size);
de = (struct ext2_dir_entry_2 *)kaddr;
de->name_len = 1;
- de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(1));
+ de->rec_len = ext2_rec_len_to_disk(EXT2_DIR_REC_LEN(1));
memcpy (de->name, ".\0\0", 4);
de->inode = cpu_to_le32(inode->i_ino);
ext2_set_de_type (de, inode);
de = (struct ext2_dir_entry_2 *)(kaddr + EXT2_DIR_REC_LEN(1));
de->name_len = 2;
- de->rec_len = cpu_to_le16(chunk_size - EXT2_DIR_REC_LEN(1));
+ de->rec_len = ext2_rec_len_to_disk(chunk_size - EXT2_DIR_REC_LEN(1));
de->inode = cpu_to_le32(parent->i_ino);
memcpy (de->name, "..\0", 4);
ext2_set_de_type (de, inode);
{
struct page *page = NULL;
unsigned long i, npages = dir_pages(inode);
+ int dir_has_error = 0;
for (i = 0; i < npages; i++) {
char *kaddr;
ext2_dirent * de;
- page = ext2_get_page(inode, i);
+ page = ext2_get_page(inode, i, dir_has_error);
- if (IS_ERR(page))
+ if (IS_ERR(page)) {
+ dir_has_error = 1;
continue;
+ }
kaddr = page_address(page);
de = (ext2_dirent *)kaddr;
while ((char *)de <= kaddr) {
if (de->rec_len == 0) {
- ext2_error(inode->i_sb, __FUNCTION__,
+ ext2_error(inode->i_sb, __func__,
"zero-length directory entry");
printk("kaddr=%p, de=%p\n", kaddr, de);
goto not_empty;
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = ext2_readdir,
- .ioctl = ext2_ioctl,
- .fsync = ext2_sync_file,
+ .unlocked_ioctl = ext2_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = ext2_compat_ioctl,
+#endif
+ .fsync = ext2_fsync,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff