From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: 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! --- fs/efs/namei.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 fs/efs/namei.c (limited to 'fs/efs/namei.c') diff --git a/fs/efs/namei.c b/fs/efs/namei.c new file mode 100644 index 000000000000..ed4a207fe22a --- /dev/null +++ b/fs/efs/namei.c @@ -0,0 +1,110 @@ +/* + * namei.c + * + * Copyright (c) 1999 Al Smith + * + * Portions derived from work (c) 1995,1996 Christian Vogelgsang. + */ + +#include +#include +#include +#include + +static efs_ino_t efs_find_entry(struct inode *inode, const char *name, int len) { + struct buffer_head *bh; + + int slot, namelen; + char *nameptr; + struct efs_dir *dirblock; + struct efs_dentry *dirslot; + efs_ino_t inodenum; + efs_block_t block; + + if (inode->i_size & (EFS_DIRBSIZE-1)) + printk(KERN_WARNING "EFS: WARNING: find_entry(): directory size not a multiple of EFS_DIRBSIZE\n"); + + for(block = 0; block < inode->i_blocks; block++) { + + bh = sb_bread(inode->i_sb, efs_bmap(inode, block)); + if (!bh) { + printk(KERN_ERR "EFS: find_entry(): failed to read dir block %d\n", block); + return 0; + } + + dirblock = (struct efs_dir *) bh->b_data; + + if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) { + printk(KERN_ERR "EFS: find_entry(): invalid directory block\n"); + brelse(bh); + return(0); + } + + for(slot = 0; slot < dirblock->slots; slot++) { + dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot)); + + namelen = dirslot->namelen; + nameptr = dirslot->name; + + if ((namelen == len) && (!memcmp(name, nameptr, len))) { + inodenum = be32_to_cpu(dirslot->inode); + brelse(bh); + return(inodenum); + } + } + brelse(bh); + } + return(0); +} + +struct dentry *efs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { + efs_ino_t inodenum; + struct inode * inode = NULL; + + lock_kernel(); + inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len); + if (inodenum) { + if (!(inode = iget(dir->i_sb, inodenum))) { + unlock_kernel(); + return ERR_PTR(-EACCES); + } + } + unlock_kernel(); + + d_add(dentry, inode); + return NULL; +} + +struct dentry *efs_get_parent(struct dentry *child) +{ + struct dentry *parent; + struct inode *inode; + efs_ino_t ino; + int error; + + lock_kernel(); + + error = -ENOENT; + ino = efs_find_entry(child->d_inode, "..", 2); + if (!ino) + goto fail; + + error = -EACCES; + inode = iget(child->d_inode->i_sb, ino); + if (!inode) + goto fail; + + error = -ENOMEM; + parent = d_alloc_anon(inode); + if (!parent) + goto fail_iput; + + unlock_kernel(); + return parent; + + fail_iput: + iput(inode); + fail: + unlock_kernel(); + return ERR_PTR(error); +} -- cgit v1.2.3