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fs/efs/namei.c
2.67 KB
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/* * namei.c * * Copyright (c) 1999 Al Smith * * Portions derived from work (c) 1995,1996 Christian Vogelgsang. */ #include <linux/buffer_head.h> #include <linux/string.h> |
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#include <linux/exportfs.h> |
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#include "efs.h" |
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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 "); 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 ", 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 "); 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; |
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struct inode *inode = NULL; |
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inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len); |
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if (inodenum) |
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inode = efs_iget(dir->i_sb, inodenum); |
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return d_splice_alias(inode, dentry); |
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} |
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static struct inode *efs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) |
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{ |
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struct inode *inode; |
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if (ino == 0) return ERR_PTR(-ESTALE); |
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inode = efs_iget(sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); |
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if (generation && inode->i_generation != generation) { |
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iput(inode); return ERR_PTR(-ESTALE); |
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} |
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return inode; } |
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struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { return generic_fh_to_dentry(sb, fid, fh_len, fh_type, efs_nfs_get_inode); } struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { return generic_fh_to_parent(sb, fid, fh_len, fh_type, efs_nfs_get_inode); |
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} |
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struct dentry *efs_get_parent(struct dentry *child) { |
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struct dentry *parent = ERR_PTR(-ENOENT); |
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efs_ino_t ino; |
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ino = efs_find_entry(child->d_inode, "..", 2); |
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if (ino) parent = d_obtain_alias(efs_iget(child->d_inode->i_sb, ino)); |
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return parent; |
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} |