mirror of
https://github.com/torvalds/linux.git
synced 2024-11-27 06:31:52 +00:00
1da177e4c3
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!
156 lines
3.7 KiB
C
156 lines
3.7 KiB
C
/*
|
|
* linux/fs/affs/dir.c
|
|
*
|
|
* (c) 1996 Hans-Joachim Widmaier - Rewritten
|
|
*
|
|
* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
|
|
*
|
|
* (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
|
|
*
|
|
* (C) 1991 Linus Torvalds - minix filesystem
|
|
*
|
|
* affs directory handling functions
|
|
*
|
|
*/
|
|
|
|
#include "affs.h"
|
|
|
|
static int affs_readdir(struct file *, void *, filldir_t);
|
|
|
|
struct file_operations affs_dir_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = affs_readdir,
|
|
.fsync = file_fsync,
|
|
};
|
|
|
|
/*
|
|
* directories can handle most operations...
|
|
*/
|
|
struct inode_operations affs_dir_inode_operations = {
|
|
.create = affs_create,
|
|
.lookup = affs_lookup,
|
|
.link = affs_link,
|
|
.unlink = affs_unlink,
|
|
.symlink = affs_symlink,
|
|
.mkdir = affs_mkdir,
|
|
.rmdir = affs_rmdir,
|
|
.rename = affs_rename,
|
|
.setattr = affs_notify_change,
|
|
};
|
|
|
|
static int
|
|
affs_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
|
{
|
|
struct inode *inode = filp->f_dentry->d_inode;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct buffer_head *dir_bh;
|
|
struct buffer_head *fh_bh;
|
|
unsigned char *name;
|
|
int namelen;
|
|
u32 i;
|
|
int hash_pos;
|
|
int chain_pos;
|
|
u32 f_pos;
|
|
u32 ino;
|
|
int stored;
|
|
int res;
|
|
|
|
pr_debug("AFFS: readdir(ino=%lu,f_pos=%lx)\n",inode->i_ino,(unsigned long)filp->f_pos);
|
|
|
|
stored = 0;
|
|
res = -EIO;
|
|
dir_bh = NULL;
|
|
fh_bh = NULL;
|
|
f_pos = filp->f_pos;
|
|
|
|
if (f_pos == 0) {
|
|
filp->private_data = (void *)0;
|
|
if (filldir(dirent, ".", 1, f_pos, inode->i_ino, DT_DIR) < 0)
|
|
return 0;
|
|
filp->f_pos = f_pos = 1;
|
|
stored++;
|
|
}
|
|
if (f_pos == 1) {
|
|
if (filldir(dirent, "..", 2, f_pos, parent_ino(filp->f_dentry), DT_DIR) < 0)
|
|
return stored;
|
|
filp->f_pos = f_pos = 2;
|
|
stored++;
|
|
}
|
|
|
|
affs_lock_dir(inode);
|
|
chain_pos = (f_pos - 2) & 0xffff;
|
|
hash_pos = (f_pos - 2) >> 16;
|
|
if (chain_pos == 0xffff) {
|
|
affs_warning(sb, "readdir", "More than 65535 entries in chain");
|
|
chain_pos = 0;
|
|
hash_pos++;
|
|
filp->f_pos = ((hash_pos << 16) | chain_pos) + 2;
|
|
}
|
|
dir_bh = affs_bread(sb, inode->i_ino);
|
|
if (!dir_bh)
|
|
goto readdir_out;
|
|
|
|
/* If the directory hasn't changed since the last call to readdir(),
|
|
* we can jump directly to where we left off.
|
|
*/
|
|
ino = (u32)(long)filp->private_data;
|
|
if (ino && filp->f_version == inode->i_version) {
|
|
pr_debug("AFFS: readdir() left off=%d\n", ino);
|
|
goto inside;
|
|
}
|
|
|
|
ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
|
|
for (i = 0; ino && i < chain_pos; i++) {
|
|
fh_bh = affs_bread(sb, ino);
|
|
if (!fh_bh) {
|
|
affs_error(sb, "readdir","Cannot read block %d", i);
|
|
goto readdir_out;
|
|
}
|
|
ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
|
|
affs_brelse(fh_bh);
|
|
fh_bh = NULL;
|
|
}
|
|
if (ino)
|
|
goto inside;
|
|
hash_pos++;
|
|
|
|
for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
|
|
ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
|
|
if (!ino)
|
|
continue;
|
|
f_pos = (hash_pos << 16) + 2;
|
|
inside:
|
|
do {
|
|
fh_bh = affs_bread(sb, ino);
|
|
if (!fh_bh) {
|
|
affs_error(sb, "readdir","Cannot read block %d", ino);
|
|
goto readdir_done;
|
|
}
|
|
|
|
namelen = min(AFFS_TAIL(sb, fh_bh)->name[0], (u8)30);
|
|
name = AFFS_TAIL(sb, fh_bh)->name + 1;
|
|
pr_debug("AFFS: readdir(): filldir(\"%.*s\", ino=%u), hash=%d, f_pos=%x\n",
|
|
namelen, name, ino, hash_pos, f_pos);
|
|
if (filldir(dirent, name, namelen, f_pos, ino, DT_UNKNOWN) < 0)
|
|
goto readdir_done;
|
|
stored++;
|
|
f_pos++;
|
|
ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
|
|
affs_brelse(fh_bh);
|
|
fh_bh = NULL;
|
|
} while (ino);
|
|
}
|
|
readdir_done:
|
|
filp->f_pos = f_pos;
|
|
filp->f_version = inode->i_version;
|
|
filp->private_data = (void *)(long)ino;
|
|
res = stored;
|
|
|
|
readdir_out:
|
|
affs_brelse(dir_bh);
|
|
affs_brelse(fh_bh);
|
|
affs_unlock_dir(inode);
|
|
pr_debug("AFFS: readdir()=%d\n", stored);
|
|
return res;
|
|
}
|