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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/hpfs/dir.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-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!
Diffstat (limited to 'fs/hpfs/dir.c')
-rw-r--r-- | fs/hpfs/dir.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c new file mode 100644 index 000000000000..0217c3a04441 --- /dev/null +++ b/fs/hpfs/dir.c @@ -0,0 +1,320 @@ +/* + * linux/fs/hpfs/dir.c + * + * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 + * + * directory VFS functions + */ + +#include "hpfs_fn.h" + +static int hpfs_dir_release(struct inode *inode, struct file *filp) +{ + lock_kernel(); + hpfs_del_pos(inode, &filp->f_pos); + /*hpfs_write_if_changed(inode);*/ + unlock_kernel(); + return 0; +} + +/* This is slow, but it's not used often */ + +static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence) +{ + loff_t new_off = off + (whence == 1 ? filp->f_pos : 0); + loff_t pos; + struct quad_buffer_head qbh; + struct inode *i = filp->f_dentry->d_inode; + struct hpfs_inode_info *hpfs_inode = hpfs_i(i); + struct super_block *s = i->i_sb; + + lock_kernel(); + + /*printk("dir lseek\n");*/ + if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; + down(&i->i_sem); + pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; + while (pos != new_off) { + if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); + else goto fail; + if (pos == 12) goto fail; + } + up(&i->i_sem); +ok: + unlock_kernel(); + return filp->f_pos = new_off; +fail: + up(&i->i_sem); + /*printk("illegal lseek: %016llx\n", new_off);*/ + unlock_kernel(); + return -ESPIPE; +} + +static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) +{ + struct inode *inode = filp->f_dentry->d_inode; + struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); + struct quad_buffer_head qbh; + struct hpfs_dirent *de; + int lc; + long old_pos; + char *tempname; + int c1, c2 = 0; + int ret = 0; + + lock_kernel(); + + if (hpfs_sb(inode->i_sb)->sb_chk) { + if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { + ret = -EFSERROR; + goto out; + } + if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { + ret = -EFSERROR; + goto out; + } + } + if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { + struct buffer_head *bh; + struct fnode *fno; + int e = 0; + if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { + ret = -EIOERROR; + goto out; + } + if (!fno->dirflag) { + e = 1; + hpfs_error(inode->i_sb, "not a directory, fnode %08x",inode->i_ino); + } + if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) { + e = 1; + hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno); + } + brelse(bh); + if (e) { + ret = -EFSERROR; + goto out; + } + } + lc = hpfs_sb(inode->i_sb)->sb_lowercase; + if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ + filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ + goto out; + } + if (filp->f_pos == 13) { + ret = -ENOENT; + goto out; + } + + while (1) { + again: + /* This won't work when cycle is longer than number of dirents + accepted by filldir, but what can I do? + maybe killall -9 ls helps */ + if (hpfs_sb(inode->i_sb)->sb_chk) + if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { + ret = -EFSERROR; + goto out; + } + if (filp->f_pos == 12) + goto out; + if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { + printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); + goto out; + } + if (filp->f_pos == 0) { + if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) + goto out; + filp->f_pos = 11; + } + if (filp->f_pos == 11) { + if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) + goto out; + filp->f_pos = 1; + } + if (filp->f_pos == 1) { + filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; + hpfs_add_pos(inode, &filp->f_pos); + filp->f_version = inode->i_version; + } + old_pos = filp->f_pos; + if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { + ret = -EIOERROR; + goto out; + } + if (de->first || de->last) { + if (hpfs_sb(inode->i_sb)->sb_chk) { + if (de->first && !de->last && (de->namelen != 2 || de ->name[0] != 1 || de->name[1] != 1)) hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08x", old_pos); + if (de->last && (de->namelen != 1 || de ->name[0] != 255)) hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08x", old_pos); + } + hpfs_brelse4(&qbh); + goto again; + } + tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); + if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) { + filp->f_pos = old_pos; + if (tempname != (char *)de->name) kfree(tempname); + hpfs_brelse4(&qbh); + goto out; + } + if (tempname != (char *)de->name) kfree(tempname); + hpfs_brelse4(&qbh); + } +out: + unlock_kernel(); + return ret; +} + +/* + * lookup. Search the specified directory for the specified name, set + * *result to the corresponding inode. + * + * lookup uses the inode number to tell read_inode whether it is reading + * the inode of a directory or a file -- file ino's are odd, directory + * ino's are even. read_inode avoids i/o for file inodes; everything + * needed is up here in the directory. (And file fnodes are out in + * the boondocks.) + * + * - M.P.: this is over, sometimes we've got to read file's fnode for eas + * inode numbers are just fnode sector numbers; iget lock is used + * to tell read_inode to read fnode or not. + */ + +struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) +{ + const char *name = dentry->d_name.name; + unsigned len = dentry->d_name.len; + struct quad_buffer_head qbh; + struct hpfs_dirent *de; + ino_t ino; + int err; + struct inode *result = NULL; + struct hpfs_inode_info *hpfs_result; + + lock_kernel(); + if ((err = hpfs_chk_name((char *)name, &len))) { + if (err == -ENAMETOOLONG) { + unlock_kernel(); + return ERR_PTR(-ENAMETOOLONG); + } + goto end_add; + } + + /* + * '.' and '..' will never be passed here. + */ + + de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *) name, len, NULL, &qbh); + + /* + * This is not really a bailout, just means file not found. + */ + + if (!de) goto end; + + /* + * Get inode number, what we're after. + */ + + ino = de->fnode; + + /* + * Go find or make an inode. + */ + + result = iget_locked(dir->i_sb, ino); + if (!result) { + hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); + goto bail1; + } + if (result->i_state & I_NEW) { + hpfs_init_inode(result); + if (de->directory) + hpfs_read_inode(result); + else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas) + hpfs_read_inode(result); + else { + result->i_mode |= S_IFREG; + result->i_mode &= ~0111; + result->i_op = &hpfs_file_iops; + result->i_fop = &hpfs_file_ops; + result->i_nlink = 1; + } + unlock_new_inode(result); + } + hpfs_result = hpfs_i(result); + if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; + + hpfs_decide_conv(result, (char *)name, len); + + if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { + hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures"); + goto bail1; + } + + /* + * Fill in the info from the directory if this is a newly created + * inode. + */ + + if (!result->i_ctime.tv_sec) { + if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, de->creation_date))) + result->i_ctime.tv_sec = 1; + result->i_ctime.tv_nsec = 0; + result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, de->write_date); + result->i_mtime.tv_nsec = 0; + result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date); + result->i_atime.tv_nsec = 0; + hpfs_result->i_ea_size = de->ea_size; + if (!hpfs_result->i_ea_mode && de->read_only) + result->i_mode &= ~0222; + if (!de->directory) { + if (result->i_size == -1) { + result->i_size = de->file_size; + result->i_data.a_ops = &hpfs_aops; + hpfs_i(result)->mmu_private = result->i_size; + /* + * i_blocks should count the fnode and any anodes. + * We count 1 for the fnode and don't bother about + * anodes -- the disk heads are on the directory band + * and we want them to stay there. + */ + result->i_blocks = 1 + ((result->i_size + 511) >> 9); + } + } + } + + hpfs_brelse4(&qbh); + + /* + * Made it. + */ + + end: + end_add: + hpfs_set_dentry_operations(dentry); + unlock_kernel(); + d_add(dentry, result); + return NULL; + + /* + * Didn't. + */ + bail1: + + hpfs_brelse4(&qbh); + + /*bail:*/ + + unlock_kernel(); + return ERR_PTR(-ENOENT); +} + +struct file_operations hpfs_dir_ops = +{ + .llseek = hpfs_dir_lseek, + .read = generic_read_dir, + .readdir = hpfs_readdir, + .release = hpfs_dir_release, + .fsync = hpfs_file_fsync, +}; |