/*
- * linux/fs/ext3/dir.c
+ * linux/fs/ext4/dir.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
- * ext3 directory handling functions
+ * ext4 directory handling functions
*
* Big-endian to little-endian byte-swapping/bitmaps by
* David S. Miller (davem@caip.rutgers.edu), 1995
*/
#include <linux/fs.h>
-#include <linux/jbd.h>
-#include <linux/ext3_fs.h>
+#include <linux/jbd2.h>
+#include <linux/ext4_fs.h>
#include <linux/buffer_head.h>
-#include <linux/smp_lock.h>
#include <linux/slab.h>
#include <linux/rbtree.h>
-static unsigned char ext3_filetype_table[] = {
+static unsigned char ext4_filetype_table[] = {
DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
};
-static int ext3_readdir(struct file *, void *, filldir_t);
-static int ext3_dx_readdir(struct file * filp,
+static int ext4_readdir(struct file *, void *, filldir_t);
+static int ext4_dx_readdir(struct file * filp,
void * dirent, filldir_t filldir);
-static int ext3_release_dir (struct inode * inode,
+static int ext4_release_dir (struct inode * inode,
struct file * filp);
-const struct file_operations ext3_dir_operations = {
+const struct file_operations ext4_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
- .readdir = ext3_readdir, /* we take BKL. needed?*/
- .ioctl = ext3_ioctl, /* BKL held */
+ .readdir = ext4_readdir, /* we take BKL. needed?*/
+ .ioctl = ext4_ioctl, /* BKL held */
#ifdef CONFIG_COMPAT
- .compat_ioctl = ext3_compat_ioctl,
-#endif
- .fsync = ext3_sync_file, /* BKL held */
-#ifdef CONFIG_EXT3_INDEX
- .release = ext3_release_dir,
+ .compat_ioctl = ext4_compat_ioctl,
#endif
+ .fsync = ext4_sync_file, /* BKL held */
+ .release = ext4_release_dir,
};
static unsigned char get_dtype(struct super_block *sb, int filetype)
{
- if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE) ||
- (filetype >= EXT3_FT_MAX))
+ if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
+ (filetype >= EXT4_FT_MAX))
return DT_UNKNOWN;
- return (ext3_filetype_table[filetype]);
+ return (ext4_filetype_table[filetype]);
}
-int ext3_check_dir_entry (const char * function, struct inode * dir,
- struct ext3_dir_entry_2 * de,
+int ext4_check_dir_entry (const char * function, struct inode * dir,
+ struct ext4_dir_entry_2 * de,
struct buffer_head * bh,
unsigned long offset)
{
const char * error_msg = NULL;
const int rlen = le16_to_cpu(de->rec_len);
- if (rlen < EXT3_DIR_REC_LEN(1))
+ if (rlen < EXT4_DIR_REC_LEN(1))
error_msg = "rec_len is smaller than minimal";
else if (rlen % 4 != 0)
error_msg = "rec_len % 4 != 0";
- else if (rlen < EXT3_DIR_REC_LEN(de->name_len))
+ else if (rlen < EXT4_DIR_REC_LEN(de->name_len))
error_msg = "rec_len is too small for name_len";
else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
error_msg = "directory entry across blocks";
else if (le32_to_cpu(de->inode) >
- le32_to_cpu(EXT3_SB(dir->i_sb)->s_es->s_inodes_count))
+ le32_to_cpu(EXT4_SB(dir->i_sb)->s_es->s_inodes_count))
error_msg = "inode out of bounds";
if (error_msg != NULL)
- ext3_error (dir->i_sb, function,
+ ext4_error (dir->i_sb, function,
"bad entry in directory #%lu: %s - "
"offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
dir->i_ino, error_msg, offset,
return error_msg == NULL ? 1 : 0;
}
-static int ext3_readdir(struct file * filp,
+static int ext4_readdir(struct file * filp,
void * dirent, filldir_t filldir)
{
int error = 0;
unsigned long offset;
int i, stored;
- struct ext3_dir_entry_2 *de;
+ struct ext4_dir_entry_2 *de;
struct super_block *sb;
int err;
- struct inode *inode = filp->f_dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
int ret = 0;
sb = inode->i_sb;
-#ifdef CONFIG_EXT3_INDEX
- if (EXT3_HAS_COMPAT_FEATURE(inode->i_sb,
- EXT3_FEATURE_COMPAT_DIR_INDEX) &&
- ((EXT3_I(inode)->i_flags & EXT3_INDEX_FL) ||
+ if (EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
+ EXT4_FEATURE_COMPAT_DIR_INDEX) &&
+ ((EXT4_I(inode)->i_flags & EXT4_INDEX_FL) ||
((inode->i_size >> sb->s_blocksize_bits) == 1))) {
- err = ext3_dx_readdir(filp, dirent, filldir);
+ err = ext4_dx_readdir(filp, dirent, filldir);
if (err != ERR_BAD_DX_DIR) {
ret = err;
goto out;
* We don't set the inode dirty flag since it's not
* critical that it get flushed back to the disk.
*/
- EXT3_I(filp->f_dentry->d_inode)->i_flags &= ~EXT3_INDEX_FL;
+ EXT4_I(filp->f_path.dentry->d_inode)->i_flags &= ~EXT4_INDEX_FL;
}
-#endif
stored = 0;
offset = filp->f_pos & (sb->s_blocksize - 1);
while (!error && !stored && filp->f_pos < inode->i_size) {
- unsigned long blk = filp->f_pos >> EXT3_BLOCK_SIZE_BITS(sb);
+ unsigned long blk = filp->f_pos >> EXT4_BLOCK_SIZE_BITS(sb);
struct buffer_head map_bh;
struct buffer_head *bh = NULL;
map_bh.b_state = 0;
- err = ext3_get_blocks_handle(NULL, inode, blk, 1,
- &map_bh, 0, 0);
+ err = ext4_get_blocks_wrap(NULL, inode, blk, 1, &map_bh, 0, 0);
if (err > 0) {
- page_cache_readahead(sb->s_bdev->bd_inode->i_mapping,
- &filp->f_ra,
- filp,
- map_bh.b_blocknr >>
- (PAGE_CACHE_SHIFT - inode->i_blkbits),
- 1);
- bh = ext3_bread(NULL, inode, blk, 0, &err);
+ pgoff_t index = map_bh.b_blocknr >>
+ (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ if (!ra_has_index(&filp->f_ra, index))
+ page_cache_sync_readahead(
+ sb->s_bdev->bd_inode->i_mapping,
+ &filp->f_ra, filp,
+ index, 1);
+ filp->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT;
+ bh = ext4_bread(NULL, inode, blk, 0, &err);
}
/*
* of recovering data when there's a bad sector
*/
if (!bh) {
- ext3_error (sb, "ext3_readdir",
+ ext4_error (sb, "ext4_readdir",
"directory #%lu contains a hole at offset %lu",
inode->i_ino, (unsigned long)filp->f_pos);
+ /* corrupt size? Maybe no more blocks to read */
+ if (filp->f_pos > inode->i_blocks << 9)
+ break;
filp->f_pos += sb->s_blocksize - offset;
continue;
}
* to make sure. */
if (filp->f_version != inode->i_version) {
for (i = 0; i < sb->s_blocksize && i < offset; ) {
- de = (struct ext3_dir_entry_2 *)
+ de = (struct ext4_dir_entry_2 *)
(bh->b_data + i);
/* It's too expensive to do a full
* dirent test each time round this
* failure will be detected in the
* dirent test below. */
if (le16_to_cpu(de->rec_len) <
- EXT3_DIR_REC_LEN(1))
+ EXT4_DIR_REC_LEN(1))
break;
i += le16_to_cpu(de->rec_len);
}
while (!error && filp->f_pos < inode->i_size
&& offset < sb->s_blocksize) {
- de = (struct ext3_dir_entry_2 *) (bh->b_data + offset);
- if (!ext3_check_dir_entry ("ext3_readdir", inode, de,
+ de = (struct ext4_dir_entry_2 *) (bh->b_data + offset);
+ if (!ext4_check_dir_entry ("ext4_readdir", inode, de,
bh, offset)) {
- /* On error, skip the f_pos to the
- next block. */
+ /*
+ * On error, skip the f_pos to the next block
+ */
filp->f_pos = (filp->f_pos |
(sb->s_blocksize - 1)) + 1;
brelse (bh);
* not the directory has been modified
* during the copy operation.
*/
- unsigned long version = filp->f_version;
+ u64 version = filp->f_version;
error = filldir(dirent, de->name,
de->name_len,
return ret;
}
-#ifdef CONFIG_EXT3_INDEX
/*
* These functions convert from the major/minor hash to an f_pos
* value.
return p;
}
-void ext3_htree_free_dir_info(struct dir_private_info *p)
+void ext4_htree_free_dir_info(struct dir_private_info *p)
{
free_rb_tree_fname(&p->root);
kfree(p);
/*
* Given a directory entry, enter it into the fname rb tree.
*/
-int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
+int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
__u32 minor_hash,
- struct ext3_dir_entry_2 *dirent)
+ struct ext4_dir_entry_2 *dirent)
{
struct rb_node **p, *parent = NULL;
struct fname * fname, *new_fn;
/*
- * This is a helper function for ext3_dx_readdir. It calls filldir
+ * This is a helper function for ext4_dx_readdir. It calls filldir
* for all entres on the fname linked list. (Normally there is only
* one entry on the linked list, unless there are 62 bit hash collisions.)
*/
{
struct dir_private_info *info = filp->private_data;
loff_t curr_pos;
- struct inode *inode = filp->f_dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block * sb;
int error;
return 0;
}
-static int ext3_dx_readdir(struct file * filp,
+static int ext4_dx_readdir(struct file * filp,
void * dirent, filldir_t filldir)
{
struct dir_private_info *info = filp->private_data;
- struct inode *inode = filp->f_dentry->d_inode;
+ struct inode *inode = filp->f_path.dentry->d_inode;
struct fname *fname;
int ret;
filp->private_data = info;
}
- if (filp->f_pos == EXT3_HTREE_EOF)
+ if (filp->f_pos == EXT4_HTREE_EOF)
return 0; /* EOF */
/* Some one has messed with f_pos; reset the world */
info->curr_node = NULL;
free_rb_tree_fname(&info->root);
filp->f_version = inode->i_version;
- ret = ext3_htree_fill_tree(filp, info->curr_hash,
+ ret = ext4_htree_fill_tree(filp, info->curr_hash,
info->curr_minor_hash,
&info->next_hash);
if (ret < 0)
return ret;
if (ret == 0) {
- filp->f_pos = EXT3_HTREE_EOF;
+ filp->f_pos = EXT4_HTREE_EOF;
break;
}
info->curr_node = rb_first(&info->root);
info->curr_node = rb_next(info->curr_node);
if (!info->curr_node) {
if (info->next_hash == ~0) {
- filp->f_pos = EXT3_HTREE_EOF;
+ filp->f_pos = EXT4_HTREE_EOF;
break;
}
info->curr_hash = info->next_hash;
return 0;
}
-static int ext3_release_dir (struct inode * inode, struct file * filp)
+static int ext4_release_dir (struct inode * inode, struct file * filp)
{
- if (filp->private_data)
- ext3_htree_free_dir_info(filp->private_data);
+ if (filp->private_data)
+ ext4_htree_free_dir_info(filp->private_data);
return 0;
}
-
-#endif
projects / linux-2.6 / blobdiff