exofs: dir_inode and directory operations
implementation of directory and inode operations. * A directory is treated as a file, and essentially contains a list of <file name, inode #> pairs for files that are found in that directory. The object IDs correspond to the files' inode numbers and are allocated using a 64bit incrementing global counter. * Each file's control block (AKA on-disk inode) is stored in its object's attributes. This applies to both regular files and other types (directories, device files, symlinks, etc.). Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Boaz Harrosh
Родитель
beaec07ba6
Коммит
e6af00f1d1
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@ -12,5 +12,5 @@
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# Kbuild - Gets included from the Kernels Makefile and build system
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#
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exofs-y := osd.o inode.o file.o symlink.o
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exofs-y := osd.o inode.o file.o symlink.o namei.o dir.o
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obj-$(CONFIG_EXOFS_FS) += exofs.o
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@ -0,0 +1,657 @@
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/*
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* Copyright (C) 2005, 2006
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* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
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* Copyright (C) 2005, 2006
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* International Business Machines
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* Copyright (C) 2008, 2009
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* Copyrights for code taken from ext2:
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* from
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* linux/fs/minix/inode.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* This file is part of exofs.
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*
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* exofs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation. Since it is based on ext2, and the only
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* valid version of GPL for the Linux kernel is version 2, the only valid
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* version of GPL for exofs is version 2.
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*
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* exofs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with exofs; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "exofs.h"
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static inline unsigned exofs_chunk_size(struct inode *inode)
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{
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return inode->i_sb->s_blocksize;
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}
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static inline void exofs_put_page(struct page *page)
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{
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kunmap(page);
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page_cache_release(page);
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}
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/* Accesses dir's inode->i_size must be called under inode lock */
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static inline unsigned long dir_pages(struct inode *inode)
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{
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return (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
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}
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static unsigned exofs_last_byte(struct inode *inode, unsigned long page_nr)
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{
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loff_t last_byte = inode->i_size;
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last_byte -= page_nr << PAGE_CACHE_SHIFT;
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if (last_byte > PAGE_CACHE_SIZE)
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last_byte = PAGE_CACHE_SIZE;
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return last_byte;
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}
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static int exofs_commit_chunk(struct page *page, loff_t pos, unsigned len)
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{
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struct address_space *mapping = page->mapping;
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struct inode *dir = mapping->host;
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int err = 0;
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dir->i_version++;
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if (!PageUptodate(page))
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SetPageUptodate(page);
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if (pos+len > dir->i_size) {
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i_size_write(dir, pos+len);
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mark_inode_dirty(dir);
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}
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set_page_dirty(page);
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if (IS_DIRSYNC(dir))
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err = write_one_page(page, 1);
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else
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unlock_page(page);
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return err;
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}
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static void exofs_check_page(struct page *page)
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{
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struct inode *dir = page->mapping->host;
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unsigned chunk_size = exofs_chunk_size(dir);
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char *kaddr = page_address(page);
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unsigned offs, rec_len;
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unsigned limit = PAGE_CACHE_SIZE;
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struct exofs_dir_entry *p;
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char *error;
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/* if the page is the last one in the directory */
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if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
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limit = dir->i_size & ~PAGE_CACHE_MASK;
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if (limit & (chunk_size - 1))
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goto Ebadsize;
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if (!limit)
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goto out;
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}
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for (offs = 0; offs <= limit - EXOFS_DIR_REC_LEN(1); offs += rec_len) {
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p = (struct exofs_dir_entry *)(kaddr + offs);
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rec_len = le16_to_cpu(p->rec_len);
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if (rec_len < EXOFS_DIR_REC_LEN(1))
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goto Eshort;
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if (rec_len & 3)
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goto Ealign;
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if (rec_len < EXOFS_DIR_REC_LEN(p->name_len))
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goto Enamelen;
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if (((offs + rec_len - 1) ^ offs) & ~(chunk_size-1))
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goto Espan;
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}
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if (offs != limit)
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goto Eend;
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out:
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SetPageChecked(page);
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return;
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Ebadsize:
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EXOFS_ERR("ERROR [exofs_check_page]: "
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"size of directory #%lu is not a multiple of chunk size",
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dir->i_ino
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);
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goto fail;
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Eshort:
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error = "rec_len is smaller than minimal";
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goto bad_entry;
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Ealign:
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error = "unaligned directory entry";
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goto bad_entry;
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Enamelen:
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error = "rec_len is too small for name_len";
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goto bad_entry;
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Espan:
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error = "directory entry across blocks";
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goto bad_entry;
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bad_entry:
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EXOFS_ERR(
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"ERROR [exofs_check_page]: bad entry in directory #%lu: %s - "
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"offset=%lu, inode=%llu, rec_len=%d, name_len=%d",
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dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
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_LLU(le64_to_cpu(p->inode_no)),
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rec_len, p->name_len);
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goto fail;
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Eend:
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p = (struct exofs_dir_entry *)(kaddr + offs);
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EXOFS_ERR("ERROR [exofs_check_page]: "
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"entry in directory #%lu spans the page boundary"
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"offset=%lu, inode=%llu",
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dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
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_LLU(le64_to_cpu(p->inode_no)));
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fail:
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SetPageChecked(page);
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SetPageError(page);
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}
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static struct page *exofs_get_page(struct inode *dir, unsigned long n)
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{
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struct address_space *mapping = dir->i_mapping;
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struct page *page = read_mapping_page(mapping, n, NULL);
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if (!IS_ERR(page)) {
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kmap(page);
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if (!PageChecked(page))
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exofs_check_page(page);
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if (PageError(page))
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goto fail;
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}
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return page;
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fail:
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exofs_put_page(page);
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return ERR_PTR(-EIO);
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}
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static inline int exofs_match(int len, const unsigned char *name,
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struct exofs_dir_entry *de)
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{
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if (len != de->name_len)
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return 0;
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if (!de->inode_no)
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return 0;
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return !memcmp(name, de->name, len);
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}
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static inline
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struct exofs_dir_entry *exofs_next_entry(struct exofs_dir_entry *p)
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{
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return (struct exofs_dir_entry *)((char *)p + le16_to_cpu(p->rec_len));
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}
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static inline unsigned
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exofs_validate_entry(char *base, unsigned offset, unsigned mask)
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{
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struct exofs_dir_entry *de = (struct exofs_dir_entry *)(base + offset);
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struct exofs_dir_entry *p =
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(struct exofs_dir_entry *)(base + (offset&mask));
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while ((char *)p < (char *)de) {
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if (p->rec_len == 0)
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break;
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p = exofs_next_entry(p);
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}
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return (char *)p - base;
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}
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static unsigned char exofs_filetype_table[EXOFS_FT_MAX] = {
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[EXOFS_FT_UNKNOWN] = DT_UNKNOWN,
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[EXOFS_FT_REG_FILE] = DT_REG,
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[EXOFS_FT_DIR] = DT_DIR,
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[EXOFS_FT_CHRDEV] = DT_CHR,
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[EXOFS_FT_BLKDEV] = DT_BLK,
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[EXOFS_FT_FIFO] = DT_FIFO,
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[EXOFS_FT_SOCK] = DT_SOCK,
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[EXOFS_FT_SYMLINK] = DT_LNK,
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};
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#define S_SHIFT 12
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static unsigned char exofs_type_by_mode[S_IFMT >> S_SHIFT] = {
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[S_IFREG >> S_SHIFT] = EXOFS_FT_REG_FILE,
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[S_IFDIR >> S_SHIFT] = EXOFS_FT_DIR,
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[S_IFCHR >> S_SHIFT] = EXOFS_FT_CHRDEV,
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[S_IFBLK >> S_SHIFT] = EXOFS_FT_BLKDEV,
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[S_IFIFO >> S_SHIFT] = EXOFS_FT_FIFO,
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[S_IFSOCK >> S_SHIFT] = EXOFS_FT_SOCK,
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[S_IFLNK >> S_SHIFT] = EXOFS_FT_SYMLINK,
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};
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static inline
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void exofs_set_de_type(struct exofs_dir_entry *de, struct inode *inode)
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{
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mode_t mode = inode->i_mode;
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de->file_type = exofs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
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}
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static int
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exofs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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loff_t pos = filp->f_pos;
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struct inode *inode = filp->f_path.dentry->d_inode;
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unsigned int offset = pos & ~PAGE_CACHE_MASK;
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unsigned long n = pos >> PAGE_CACHE_SHIFT;
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unsigned long npages = dir_pages(inode);
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unsigned chunk_mask = ~(exofs_chunk_size(inode)-1);
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unsigned char *types = NULL;
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int need_revalidate = (filp->f_version != inode->i_version);
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if (pos > inode->i_size - EXOFS_DIR_REC_LEN(1))
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return 0;
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types = exofs_filetype_table;
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for ( ; n < npages; n++, offset = 0) {
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char *kaddr, *limit;
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struct exofs_dir_entry *de;
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struct page *page = exofs_get_page(inode, n);
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if (IS_ERR(page)) {
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EXOFS_ERR("ERROR: "
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"bad page in #%lu",
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inode->i_ino);
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filp->f_pos += PAGE_CACHE_SIZE - offset;
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return PTR_ERR(page);
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}
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kaddr = page_address(page);
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if (unlikely(need_revalidate)) {
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if (offset) {
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offset = exofs_validate_entry(kaddr, offset,
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chunk_mask);
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filp->f_pos = (n<<PAGE_CACHE_SHIFT) + offset;
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}
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filp->f_version = inode->i_version;
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need_revalidate = 0;
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}
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de = (struct exofs_dir_entry *)(kaddr + offset);
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limit = kaddr + exofs_last_byte(inode, n) -
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EXOFS_DIR_REC_LEN(1);
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for (; (char *)de <= limit; de = exofs_next_entry(de)) {
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if (de->rec_len == 0) {
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EXOFS_ERR("ERROR: "
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"zero-length directory entry");
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exofs_put_page(page);
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return -EIO;
|
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}
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if (de->inode_no) {
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int over;
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unsigned char d_type = DT_UNKNOWN;
|
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|
||||
if (types && de->file_type < EXOFS_FT_MAX)
|
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d_type = types[de->file_type];
|
||||
|
||||
offset = (char *)de - kaddr;
|
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over = filldir(dirent, de->name, de->name_len,
|
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(n<<PAGE_CACHE_SHIFT) | offset,
|
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le64_to_cpu(de->inode_no),
|
||||
d_type);
|
||||
if (over) {
|
||||
exofs_put_page(page);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
filp->f_pos += le16_to_cpu(de->rec_len);
|
||||
}
|
||||
exofs_put_page(page);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct exofs_dir_entry *exofs_find_entry(struct inode *dir,
|
||||
struct dentry *dentry, struct page **res_page)
|
||||
{
|
||||
const unsigned char *name = dentry->d_name.name;
|
||||
int namelen = dentry->d_name.len;
|
||||
unsigned reclen = EXOFS_DIR_REC_LEN(namelen);
|
||||
unsigned long start, n;
|
||||
unsigned long npages = dir_pages(dir);
|
||||
struct page *page = NULL;
|
||||
struct exofs_i_info *oi = exofs_i(dir);
|
||||
struct exofs_dir_entry *de;
|
||||
|
||||
if (npages == 0)
|
||||
goto out;
|
||||
|
||||
*res_page = NULL;
|
||||
|
||||
start = oi->i_dir_start_lookup;
|
||||
if (start >= npages)
|
||||
start = 0;
|
||||
n = start;
|
||||
do {
|
||||
char *kaddr;
|
||||
page = exofs_get_page(dir, n);
|
||||
if (!IS_ERR(page)) {
|
||||
kaddr = page_address(page);
|
||||
de = (struct exofs_dir_entry *) kaddr;
|
||||
kaddr += exofs_last_byte(dir, n) - reclen;
|
||||
while ((char *) de <= kaddr) {
|
||||
if (de->rec_len == 0) {
|
||||
EXOFS_ERR(
|
||||
"ERROR: exofs_find_entry: "
|
||||
"zero-length directory entry");
|
||||
exofs_put_page(page);
|
||||
goto out;
|
||||
}
|
||||
if (exofs_match(namelen, name, de))
|
||||
goto found;
|
||||
de = exofs_next_entry(de);
|
||||
}
|
||||
exofs_put_page(page);
|
||||
}
|
||||
if (++n >= npages)
|
||||
n = 0;
|
||||
} while (n != start);
|
||||
out:
|
||||
return NULL;
|
||||
|
||||
found:
|
||||
*res_page = page;
|
||||
oi->i_dir_start_lookup = n;
|
||||
return de;
|
||||
}
|
||||
|
||||
struct exofs_dir_entry *exofs_dotdot(struct inode *dir, struct page **p)
|
||||
{
|
||||
struct page *page = exofs_get_page(dir, 0);
|
||||
struct exofs_dir_entry *de = NULL;
|
||||
|
||||
if (!IS_ERR(page)) {
|
||||
de = exofs_next_entry(
|
||||
(struct exofs_dir_entry *)page_address(page));
|
||||
*p = page;
|
||||
}
|
||||
return de;
|
||||
}
|
||||
|
||||
ino_t exofs_inode_by_name(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
ino_t res = 0;
|
||||
struct exofs_dir_entry *de;
|
||||
struct page *page;
|
||||
|
||||
de = exofs_find_entry(dir, dentry, &page);
|
||||
if (de) {
|
||||
res = le64_to_cpu(de->inode_no);
|
||||
exofs_put_page(page);
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
int exofs_set_link(struct inode *dir, struct exofs_dir_entry *de,
|
||||
struct page *page, struct inode *inode)
|
||||
{
|
||||
loff_t pos = page_offset(page) +
|
||||
(char *) de - (char *) page_address(page);
|
||||
unsigned len = le16_to_cpu(de->rec_len);
|
||||
int err;
|
||||
|
||||
lock_page(page);
|
||||
err = exofs_write_begin(NULL, page->mapping, pos, len,
|
||||
AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
|
||||
if (err)
|
||||
EXOFS_ERR("exofs_set_link: exofs_write_begin FAILD => %d\n",
|
||||
err);
|
||||
|
||||
de->inode_no = cpu_to_le64(inode->i_ino);
|
||||
exofs_set_de_type(de, inode);
|
||||
if (likely(!err))
|
||||
err = exofs_commit_chunk(page, pos, len);
|
||||
exofs_put_page(page);
|
||||
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
||||
mark_inode_dirty(dir);
|
||||
return err;
|
||||
}
|
||||
|
||||
int exofs_add_link(struct dentry *dentry, struct inode *inode)
|
||||
{
|
||||
struct inode *dir = dentry->d_parent->d_inode;
|
||||
const unsigned char *name = dentry->d_name.name;
|
||||
int namelen = dentry->d_name.len;
|
||||
unsigned chunk_size = exofs_chunk_size(dir);
|
||||
unsigned reclen = EXOFS_DIR_REC_LEN(namelen);
|
||||
unsigned short rec_len, name_len;
|
||||
struct page *page = NULL;
|
||||
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
|
||||
struct exofs_dir_entry *de;
|
||||
unsigned long npages = dir_pages(dir);
|
||||
unsigned long n;
|
||||
char *kaddr;
|
||||
loff_t pos;
|
||||
int err;
|
||||
|
||||
for (n = 0; n <= npages; n++) {
|
||||
char *dir_end;
|
||||
|
||||
page = exofs_get_page(dir, n);
|
||||
err = PTR_ERR(page);
|
||||
if (IS_ERR(page))
|
||||
goto out;
|
||||
lock_page(page);
|
||||
kaddr = page_address(page);
|
||||
dir_end = kaddr + exofs_last_byte(dir, n);
|
||||
de = (struct exofs_dir_entry *)kaddr;
|
||||
kaddr += PAGE_CACHE_SIZE - reclen;
|
||||
while ((char *)de <= kaddr) {
|
||||
if ((char *)de == dir_end) {
|
||||
name_len = 0;
|
||||
rec_len = chunk_size;
|
||||
de->rec_len = cpu_to_le16(chunk_size);
|
||||
de->inode_no = 0;
|
||||
goto got_it;
|
||||
}
|
||||
if (de->rec_len == 0) {
|
||||
EXOFS_ERR("ERROR: exofs_add_link: "
|
||||
"zero-length directory entry");
|
||||
err = -EIO;
|
||||
goto out_unlock;
|
||||
}
|
||||
err = -EEXIST;
|
||||
if (exofs_match(namelen, name, de))
|
||||
goto out_unlock;
|
||||
name_len = EXOFS_DIR_REC_LEN(de->name_len);
|
||||
rec_len = le16_to_cpu(de->rec_len);
|
||||
if (!de->inode_no && rec_len >= reclen)
|
||||
goto got_it;
|
||||
if (rec_len >= name_len + reclen)
|
||||
goto got_it;
|
||||
de = (struct exofs_dir_entry *) ((char *) de + rec_len);
|
||||
}
|
||||
unlock_page(page);
|
||||
exofs_put_page(page);
|
||||
}
|
||||
|
||||
EXOFS_ERR("exofs_add_link: BAD dentry=%p or inode=%p", dentry, inode);
|
||||
return -EINVAL;
|
||||
|
||||
got_it:
|
||||
pos = page_offset(page) +
|
||||
(char *)de - (char *)page_address(page);
|
||||
err = exofs_write_begin(NULL, page->mapping, pos, rec_len, 0,
|
||||
&page, NULL);
|
||||
if (err)
|
||||
goto out_unlock;
|
||||
if (de->inode_no) {
|
||||
struct exofs_dir_entry *de1 =
|
||||
(struct exofs_dir_entry *)((char *)de + name_len);
|
||||
de1->rec_len = cpu_to_le16(rec_len - name_len);
|
||||
de->rec_len = cpu_to_le16(name_len);
|
||||
de = de1;
|
||||
}
|
||||
de->name_len = namelen;
|
||||
memcpy(de->name, name, namelen);
|
||||
de->inode_no = cpu_to_le64(inode->i_ino);
|
||||
exofs_set_de_type(de, inode);
|
||||
err = exofs_commit_chunk(page, pos, rec_len);
|
||||
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
||||
mark_inode_dirty(dir);
|
||||
sbi->s_numfiles++;
|
||||
|
||||
out_put:
|
||||
exofs_put_page(page);
|
||||
out:
|
||||
return err;
|
||||
out_unlock:
|
||||
unlock_page(page);
|
||||
goto out_put;
|
||||
}
|
||||
|
||||
int exofs_delete_entry(struct exofs_dir_entry *dir, struct page *page)
|
||||
{
|
||||
struct address_space *mapping = page->mapping;
|
||||
struct inode *inode = mapping->host;
|
||||
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
|
||||
char *kaddr = page_address(page);
|
||||
unsigned from = ((char *)dir - kaddr) & ~(exofs_chunk_size(inode)-1);
|
||||
unsigned to = ((char *)dir - kaddr) + le16_to_cpu(dir->rec_len);
|
||||
loff_t pos;
|
||||
struct exofs_dir_entry *pde = NULL;
|
||||
struct exofs_dir_entry *de = (struct exofs_dir_entry *) (kaddr + from);
|
||||
int err;
|
||||
|
||||
while (de < dir) {
|
||||
if (de->rec_len == 0) {
|
||||
EXOFS_ERR("ERROR: exofs_delete_entry:"
|
||||
"zero-length directory entry");
|
||||
err = -EIO;
|
||||
goto out;
|
||||
}
|
||||
pde = de;
|
||||
de = exofs_next_entry(de);
|
||||
}
|
||||
if (pde)
|
||||
from = (char *)pde - (char *)page_address(page);
|
||||
pos = page_offset(page) + from;
|
||||
lock_page(page);
|
||||
err = exofs_write_begin(NULL, page->mapping, pos, to - from, 0,
|
||||
&page, NULL);
|
||||
if (err)
|
||||
EXOFS_ERR("exofs_delete_entry: exofs_write_begin FAILD => %d\n",
|
||||
err);
|
||||
if (pde)
|
||||
pde->rec_len = cpu_to_le16(to - from);
|
||||
dir->inode_no = 0;
|
||||
if (likely(!err))
|
||||
err = exofs_commit_chunk(page, pos, to - from);
|
||||
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
|
||||
mark_inode_dirty(inode);
|
||||
sbi->s_numfiles--;
|
||||
out:
|
||||
exofs_put_page(page);
|
||||
return err;
|
||||
}
|
||||
|
||||
/* kept aligned on 4 bytes */
|
||||
#define THIS_DIR ".\0\0"
|
||||
#define PARENT_DIR "..\0"
|
||||
|
||||
int exofs_make_empty(struct inode *inode, struct inode *parent)
|
||||
{
|
||||
struct address_space *mapping = inode->i_mapping;
|
||||
struct page *page = grab_cache_page(mapping, 0);
|
||||
unsigned chunk_size = exofs_chunk_size(inode);
|
||||
struct exofs_dir_entry *de;
|
||||
int err;
|
||||
void *kaddr;
|
||||
|
||||
if (!page)
|
||||
return -ENOMEM;
|
||||
|
||||
err = exofs_write_begin(NULL, page->mapping, 0, chunk_size, 0,
|
||||
&page, NULL);
|
||||
if (err) {
|
||||
unlock_page(page);
|
||||
goto fail;
|
||||
}
|
||||
|
||||
kaddr = kmap_atomic(page, KM_USER0);
|
||||
de = (struct exofs_dir_entry *)kaddr;
|
||||
de->name_len = 1;
|
||||
de->rec_len = cpu_to_le16(EXOFS_DIR_REC_LEN(1));
|
||||
memcpy(de->name, THIS_DIR, sizeof(THIS_DIR));
|
||||
de->inode_no = cpu_to_le64(inode->i_ino);
|
||||
exofs_set_de_type(de, inode);
|
||||
|
||||
de = (struct exofs_dir_entry *)(kaddr + EXOFS_DIR_REC_LEN(1));
|
||||
de->name_len = 2;
|
||||
de->rec_len = cpu_to_le16(chunk_size - EXOFS_DIR_REC_LEN(1));
|
||||
de->inode_no = cpu_to_le64(parent->i_ino);
|
||||
memcpy(de->name, PARENT_DIR, sizeof(PARENT_DIR));
|
||||
exofs_set_de_type(de, inode);
|
||||
kunmap_atomic(page, KM_USER0);
|
||||
err = exofs_commit_chunk(page, 0, chunk_size);
|
||||
fail:
|
||||
page_cache_release(page);
|
||||
return err;
|
||||
}
|
||||
|
||||
int exofs_empty_dir(struct inode *inode)
|
||||
{
|
||||
struct page *page = NULL;
|
||||
unsigned long i, npages = dir_pages(inode);
|
||||
|
||||
for (i = 0; i < npages; i++) {
|
||||
char *kaddr;
|
||||
struct exofs_dir_entry *de;
|
||||
page = exofs_get_page(inode, i);
|
||||
|
||||
if (IS_ERR(page))
|
||||
continue;
|
||||
|
||||
kaddr = page_address(page);
|
||||
de = (struct exofs_dir_entry *)kaddr;
|
||||
kaddr += exofs_last_byte(inode, i) - EXOFS_DIR_REC_LEN(1);
|
||||
|
||||
while ((char *)de <= kaddr) {
|
||||
if (de->rec_len == 0) {
|
||||
EXOFS_ERR("ERROR: exofs_empty_dir: "
|
||||
"zero-length directory entry"
|
||||
"kaddr=%p, de=%p\n", kaddr, de);
|
||||
goto not_empty;
|
||||
}
|
||||
if (de->inode_no != 0) {
|
||||
/* check for . and .. */
|
||||
if (de->name[0] != '.')
|
||||
goto not_empty;
|
||||
if (de->name_len > 2)
|
||||
goto not_empty;
|
||||
if (de->name_len < 2) {
|
||||
if (le64_to_cpu(de->inode_no) !=
|
||||
inode->i_ino)
|
||||
goto not_empty;
|
||||
} else if (de->name[1] != '.')
|
||||
goto not_empty;
|
||||
}
|
||||
de = exofs_next_entry(de);
|
||||
}
|
||||
exofs_put_page(page);
|
||||
}
|
||||
return 1;
|
||||
|
||||
not_empty:
|
||||
exofs_put_page(page);
|
||||
return 0;
|
||||
}
|
||||
|
||||
const struct file_operations exofs_dir_operations = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = generic_read_dir,
|
||||
.readdir = exofs_readdir,
|
||||
};
|
||||
|
|
@ -124,6 +124,11 @@ static inline struct exofs_i_info *exofs_i(struct inode *inode)
|
|||
return container_of(inode, struct exofs_i_info, vfs_inode);
|
||||
}
|
||||
|
||||
/*
|
||||
* Maximum count of links to a file
|
||||
*/
|
||||
#define EXOFS_LINK_MAX 32000
|
||||
|
||||
/*************************
|
||||
* function declarations *
|
||||
*************************/
|
||||
|
|
@ -133,10 +138,27 @@ int exofs_setattr(struct dentry *, struct iattr *);
|
|||
int exofs_write_begin(struct file *file, struct address_space *mapping,
|
||||
loff_t pos, unsigned len, unsigned flags,
|
||||
struct page **pagep, void **fsdata);
|
||||
extern struct inode *exofs_iget(struct super_block *, unsigned long);
|
||||
struct inode *exofs_new_inode(struct inode *, int);
|
||||
|
||||
/* dir.c: */
|
||||
int exofs_add_link(struct dentry *, struct inode *);
|
||||
ino_t exofs_inode_by_name(struct inode *, struct dentry *);
|
||||
int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
|
||||
int exofs_make_empty(struct inode *, struct inode *);
|
||||
struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
|
||||
struct page **);
|
||||
int exofs_empty_dir(struct inode *);
|
||||
struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
|
||||
int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
|
||||
struct inode *);
|
||||
|
||||
/*********************
|
||||
* operation vectors *
|
||||
*********************/
|
||||
/* dir.c: */
|
||||
extern const struct file_operations exofs_dir_operations;
|
||||
|
||||
/* file.c */
|
||||
extern const struct inode_operations exofs_file_inode_operations;
|
||||
extern const struct file_operations exofs_file_operations;
|
||||
|
|
@ -144,6 +166,10 @@ extern const struct file_operations exofs_file_operations;
|
|||
/* inode.c */
|
||||
extern const struct address_space_operations exofs_aops;
|
||||
|
||||
/* namei.c */
|
||||
extern const struct inode_operations exofs_dir_inode_operations;
|
||||
extern const struct inode_operations exofs_special_inode_operations;
|
||||
|
||||
/* symlink.c */
|
||||
extern const struct inode_operations exofs_symlink_inode_operations;
|
||||
extern const struct inode_operations exofs_fast_symlink_inode_operations;
|
||||
|
|
|
|||
272
fs/exofs/inode.c
272
fs/exofs/inode.c
|
|
@ -843,3 +843,275 @@ int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
|
|||
error = inode_setattr(inode, iattr);
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Read an inode from the OSD, and return it as is. We also return the size
|
||||
* attribute in the 'sanity' argument if we got compiled with debugging turned
|
||||
* on.
|
||||
*/
|
||||
static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
|
||||
struct exofs_fcb *inode, uint64_t *sanity)
|
||||
{
|
||||
struct exofs_sb_info *sbi = sb->s_fs_info;
|
||||
struct osd_request *or;
|
||||
struct osd_attr attr;
|
||||
struct osd_obj_id obj = {sbi->s_pid,
|
||||
oi->vfs_inode.i_ino + EXOFS_OBJ_OFF};
|
||||
int ret;
|
||||
|
||||
exofs_make_credential(oi->i_cred, &obj);
|
||||
|
||||
or = osd_start_request(sbi->s_dev, GFP_KERNEL);
|
||||
if (unlikely(!or)) {
|
||||
EXOFS_ERR("exofs_get_inode: osd_start_request failed.\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
osd_req_get_attributes(or, &obj);
|
||||
|
||||
/* we need the inode attribute */
|
||||
osd_req_add_get_attr_list(or, &g_attr_inode_data, 1);
|
||||
|
||||
#ifdef EXOFS_DEBUG_OBJ_ISIZE
|
||||
/* we get the size attributes to do a sanity check */
|
||||
osd_req_add_get_attr_list(or, &g_attr_logical_length, 1);
|
||||
#endif
|
||||
|
||||
ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
attr = g_attr_inode_data;
|
||||
ret = extract_attr_from_req(or, &attr);
|
||||
if (ret) {
|
||||
EXOFS_ERR("exofs_get_inode: extract_attr_from_req failed\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
WARN_ON(attr.len != EXOFS_INO_ATTR_SIZE);
|
||||
memcpy(inode, attr.val_ptr, EXOFS_INO_ATTR_SIZE);
|
||||
|
||||
#ifdef EXOFS_DEBUG_OBJ_ISIZE
|
||||
attr = g_attr_logical_length;
|
||||
ret = extract_attr_from_req(or, &attr);
|
||||
if (ret) {
|
||||
EXOFS_ERR("ERROR: extract attr from or failed\n");
|
||||
goto out;
|
||||
}
|
||||
*sanity = get_unaligned_be64(attr.val_ptr);
|
||||
#endif
|
||||
|
||||
out:
|
||||
osd_end_request(or);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Fill in an inode read from the OSD and set it up for use
|
||||
*/
|
||||
struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
|
||||
{
|
||||
struct exofs_i_info *oi;
|
||||
struct exofs_fcb fcb;
|
||||
struct inode *inode;
|
||||
uint64_t uninitialized_var(sanity);
|
||||
int ret;
|
||||
|
||||
inode = iget_locked(sb, ino);
|
||||
if (!inode)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
if (!(inode->i_state & I_NEW))
|
||||
return inode;
|
||||
oi = exofs_i(inode);
|
||||
|
||||
/* read the inode from the osd */
|
||||
ret = exofs_get_inode(sb, oi, &fcb, &sanity);
|
||||
if (ret)
|
||||
goto bad_inode;
|
||||
|
||||
init_waitqueue_head(&oi->i_wq);
|
||||
set_obj_created(oi);
|
||||
|
||||
/* copy stuff from on-disk struct to in-memory struct */
|
||||
inode->i_mode = le16_to_cpu(fcb.i_mode);
|
||||
inode->i_uid = le32_to_cpu(fcb.i_uid);
|
||||
inode->i_gid = le32_to_cpu(fcb.i_gid);
|
||||
inode->i_nlink = le16_to_cpu(fcb.i_links_count);
|
||||
inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
|
||||
inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
|
||||
inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
|
||||
inode->i_ctime.tv_nsec =
|
||||
inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
|
||||
oi->i_commit_size = le64_to_cpu(fcb.i_size);
|
||||
i_size_write(inode, oi->i_commit_size);
|
||||
inode->i_blkbits = EXOFS_BLKSHIFT;
|
||||
inode->i_generation = le32_to_cpu(fcb.i_generation);
|
||||
|
||||
#ifdef EXOFS_DEBUG_OBJ_ISIZE
|
||||
if ((inode->i_size != sanity) &&
|
||||
(!exofs_inode_is_fast_symlink(inode))) {
|
||||
EXOFS_ERR("WARNING: Size of object from inode and "
|
||||
"attributes differ (%lld != %llu)\n",
|
||||
inode->i_size, _LLU(sanity));
|
||||
}
|
||||
#endif
|
||||
|
||||
oi->i_dir_start_lookup = 0;
|
||||
|
||||
if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
|
||||
ret = -ESTALE;
|
||||
goto bad_inode;
|
||||
}
|
||||
|
||||
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
|
||||
if (fcb.i_data[0])
|
||||
inode->i_rdev =
|
||||
old_decode_dev(le32_to_cpu(fcb.i_data[0]));
|
||||
else
|
||||
inode->i_rdev =
|
||||
new_decode_dev(le32_to_cpu(fcb.i_data[1]));
|
||||
} else {
|
||||
memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
|
||||
}
|
||||
|
||||
if (S_ISREG(inode->i_mode)) {
|
||||
inode->i_op = &exofs_file_inode_operations;
|
||||
inode->i_fop = &exofs_file_operations;
|
||||
inode->i_mapping->a_ops = &exofs_aops;
|
||||
} else if (S_ISDIR(inode->i_mode)) {
|
||||
inode->i_op = &exofs_dir_inode_operations;
|
||||
inode->i_fop = &exofs_dir_operations;
|
||||
inode->i_mapping->a_ops = &exofs_aops;
|
||||
} else if (S_ISLNK(inode->i_mode)) {
|
||||
if (exofs_inode_is_fast_symlink(inode))
|
||||
inode->i_op = &exofs_fast_symlink_inode_operations;
|
||||
else {
|
||||
inode->i_op = &exofs_symlink_inode_operations;
|
||||
inode->i_mapping->a_ops = &exofs_aops;
|
||||
}
|
||||
} else {
|
||||
inode->i_op = &exofs_special_inode_operations;
|
||||
if (fcb.i_data[0])
|
||||
init_special_inode(inode, inode->i_mode,
|
||||
old_decode_dev(le32_to_cpu(fcb.i_data[0])));
|
||||
else
|
||||
init_special_inode(inode, inode->i_mode,
|
||||
new_decode_dev(le32_to_cpu(fcb.i_data[1])));
|
||||
}
|
||||
|
||||
unlock_new_inode(inode);
|
||||
return inode;
|
||||
|
||||
bad_inode:
|
||||
iget_failed(inode);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
int __exofs_wait_obj_created(struct exofs_i_info *oi)
|
||||
{
|
||||
if (!obj_created(oi)) {
|
||||
BUG_ON(!obj_2bcreated(oi));
|
||||
wait_event(oi->i_wq, obj_created(oi));
|
||||
}
|
||||
return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
|
||||
}
|
||||
/*
|
||||
* Callback function from exofs_new_inode(). The important thing is that we
|
||||
* set the obj_created flag so that other methods know that the object exists on
|
||||
* the OSD.
|
||||
*/
|
||||
static void create_done(struct osd_request *or, void *p)
|
||||
{
|
||||
struct inode *inode = p;
|
||||
struct exofs_i_info *oi = exofs_i(inode);
|
||||
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
|
||||
int ret;
|
||||
|
||||
ret = exofs_check_ok(or);
|
||||
osd_end_request(or);
|
||||
atomic_dec(&sbi->s_curr_pending);
|
||||
|
||||
if (unlikely(ret)) {
|
||||
EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx",
|
||||
_LLU(sbi->s_pid), _LLU(inode->i_ino + EXOFS_OBJ_OFF));
|
||||
make_bad_inode(inode);
|
||||
} else
|
||||
set_obj_created(oi);
|
||||
|
||||
atomic_dec(&inode->i_count);
|
||||
wake_up(&oi->i_wq);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set up a new inode and create an object for it on the OSD
|
||||
*/
|
||||
struct inode *exofs_new_inode(struct inode *dir, int mode)
|
||||
{
|
||||
struct super_block *sb;
|
||||
struct inode *inode;
|
||||
struct exofs_i_info *oi;
|
||||
struct exofs_sb_info *sbi;
|
||||
struct osd_request *or;
|
||||
struct osd_obj_id obj;
|
||||
int ret;
|
||||
|
||||
sb = dir->i_sb;
|
||||
inode = new_inode(sb);
|
||||
if (!inode)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
oi = exofs_i(inode);
|
||||
|
||||
init_waitqueue_head(&oi->i_wq);
|
||||
set_obj_2bcreated(oi);
|
||||
|
||||
sbi = sb->s_fs_info;
|
||||
|
||||
sb->s_dirt = 1;
|
||||
inode->i_uid = current->cred->fsuid;
|
||||
if (dir->i_mode & S_ISGID) {
|
||||
inode->i_gid = dir->i_gid;
|
||||
if (S_ISDIR(mode))
|
||||
mode |= S_ISGID;
|
||||
} else {
|
||||
inode->i_gid = current->cred->fsgid;
|
||||
}
|
||||
inode->i_mode = mode;
|
||||
|
||||
inode->i_ino = sbi->s_nextid++;
|
||||
inode->i_blkbits = EXOFS_BLKSHIFT;
|
||||
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
||||
oi->i_commit_size = inode->i_size = 0;
|
||||
spin_lock(&sbi->s_next_gen_lock);
|
||||
inode->i_generation = sbi->s_next_generation++;
|
||||
spin_unlock(&sbi->s_next_gen_lock);
|
||||
insert_inode_hash(inode);
|
||||
|
||||
mark_inode_dirty(inode);
|
||||
|
||||
obj.partition = sbi->s_pid;
|
||||
obj.id = inode->i_ino + EXOFS_OBJ_OFF;
|
||||
exofs_make_credential(oi->i_cred, &obj);
|
||||
|
||||
or = osd_start_request(sbi->s_dev, GFP_KERNEL);
|
||||
if (unlikely(!or)) {
|
||||
EXOFS_ERR("exofs_new_inode: osd_start_request failed\n");
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
|
||||
osd_req_create_object(or, &obj);
|
||||
|
||||
/* increment the refcount so that the inode will still be around when we
|
||||
* reach the callback
|
||||
*/
|
||||
atomic_inc(&inode->i_count);
|
||||
|
||||
ret = exofs_async_op(or, create_done, inode, oi->i_cred);
|
||||
if (ret) {
|
||||
atomic_dec(&inode->i_count);
|
||||
osd_end_request(or);
|
||||
return ERR_PTR(-EIO);
|
||||
}
|
||||
atomic_inc(&sbi->s_curr_pending);
|
||||
|
||||
return inode;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,342 @@
|
|||
/*
|
||||
* Copyright (C) 2005, 2006
|
||||
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
||||
* Copyright (C) 2005, 2006
|
||||
* International Business Machines
|
||||
* Copyright (C) 2008, 2009
|
||||
* Boaz Harrosh <bharrosh@panasas.com>
|
||||
*
|
||||
* Copyrights for code taken from ext2:
|
||||
* Copyright (C) 1992, 1993, 1994, 1995
|
||||
* Remy Card (card@masi.ibp.fr)
|
||||
* Laboratoire MASI - Institut Blaise Pascal
|
||||
* Universite Pierre et Marie Curie (Paris VI)
|
||||
* from
|
||||
* linux/fs/minix/inode.c
|
||||
* Copyright (C) 1991, 1992 Linus Torvalds
|
||||
*
|
||||
* This file is part of exofs.
|
||||
*
|
||||
* exofs is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation. Since it is based on ext2, and the only
|
||||
* valid version of GPL for the Linux kernel is version 2, the only valid
|
||||
* version of GPL for exofs is version 2.
|
||||
*
|
||||
* exofs is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with exofs; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*/
|
||||
|
||||
#include "exofs.h"
|
||||
|
||||
static inline int exofs_add_nondir(struct dentry *dentry, struct inode *inode)
|
||||
{
|
||||
int err = exofs_add_link(dentry, inode);
|
||||
if (!err) {
|
||||
d_instantiate(dentry, inode);
|
||||
return 0;
|
||||
}
|
||||
inode_dec_link_count(inode);
|
||||
iput(inode);
|
||||
return err;
|
||||
}
|
||||
|
||||
static struct dentry *exofs_lookup(struct inode *dir, struct dentry *dentry,
|
||||
struct nameidata *nd)
|
||||
{
|
||||
struct inode *inode;
|
||||
ino_t ino;
|
||||
|
||||
if (dentry->d_name.len > EXOFS_NAME_LEN)
|
||||
return ERR_PTR(-ENAMETOOLONG);
|
||||
|
||||
ino = exofs_inode_by_name(dir, dentry);
|
||||
inode = NULL;
|
||||
if (ino) {
|
||||
inode = exofs_iget(dir->i_sb, ino);
|
||||
if (IS_ERR(inode))
|
||||
return ERR_CAST(inode);
|
||||
}
|
||||
return d_splice_alias(inode, dentry);
|
||||
}
|
||||
|
||||
static int exofs_create(struct inode *dir, struct dentry *dentry, int mode,
|
||||
struct nameidata *nd)
|
||||
{
|
||||
struct inode *inode = exofs_new_inode(dir, mode);
|
||||
int err = PTR_ERR(inode);
|
||||
if (!IS_ERR(inode)) {
|
||||
inode->i_op = &exofs_file_inode_operations;
|
||||
inode->i_fop = &exofs_file_operations;
|
||||
inode->i_mapping->a_ops = &exofs_aops;
|
||||
mark_inode_dirty(inode);
|
||||
err = exofs_add_nondir(dentry, inode);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static int exofs_mknod(struct inode *dir, struct dentry *dentry, int mode,
|
||||
dev_t rdev)
|
||||
{
|
||||
struct inode *inode;
|
||||
int err;
|
||||
|
||||
if (!new_valid_dev(rdev))
|
||||
return -EINVAL;
|
||||
|
||||
inode = exofs_new_inode(dir, mode);
|
||||
err = PTR_ERR(inode);
|
||||
if (!IS_ERR(inode)) {
|
||||
init_special_inode(inode, inode->i_mode, rdev);
|
||||
mark_inode_dirty(inode);
|
||||
err = exofs_add_nondir(dentry, inode);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static int exofs_symlink(struct inode *dir, struct dentry *dentry,
|
||||
const char *symname)
|
||||
{
|
||||
struct super_block *sb = dir->i_sb;
|
||||
int err = -ENAMETOOLONG;
|
||||
unsigned l = strlen(symname)+1;
|
||||
struct inode *inode;
|
||||
struct exofs_i_info *oi;
|
||||
|
||||
if (l > sb->s_blocksize)
|
||||
goto out;
|
||||
|
||||
inode = exofs_new_inode(dir, S_IFLNK | S_IRWXUGO);
|
||||
err = PTR_ERR(inode);
|
||||
if (IS_ERR(inode))
|
||||
goto out;
|
||||
|
||||
oi = exofs_i(inode);
|
||||
if (l > sizeof(oi->i_data)) {
|
||||
/* slow symlink */
|
||||
inode->i_op = &exofs_symlink_inode_operations;
|
||||
inode->i_mapping->a_ops = &exofs_aops;
|
||||
memset(oi->i_data, 0, sizeof(oi->i_data));
|
||||
|
||||
err = page_symlink(inode, symname, l);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
} else {
|
||||
/* fast symlink */
|
||||
inode->i_op = &exofs_fast_symlink_inode_operations;
|
||||
memcpy(oi->i_data, symname, l);
|
||||
inode->i_size = l-1;
|
||||
}
|
||||
mark_inode_dirty(inode);
|
||||
|
||||
err = exofs_add_nondir(dentry, inode);
|
||||
out:
|
||||
return err;
|
||||
|
||||
out_fail:
|
||||
inode_dec_link_count(inode);
|
||||
iput(inode);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static int exofs_link(struct dentry *old_dentry, struct inode *dir,
|
||||
struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode = old_dentry->d_inode;
|
||||
|
||||
if (inode->i_nlink >= EXOFS_LINK_MAX)
|
||||
return -EMLINK;
|
||||
|
||||
inode->i_ctime = CURRENT_TIME;
|
||||
inode_inc_link_count(inode);
|
||||
atomic_inc(&inode->i_count);
|
||||
|
||||
return exofs_add_nondir(dentry, inode);
|
||||
}
|
||||
|
||||
static int exofs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
||||
{
|
||||
struct inode *inode;
|
||||
int err = -EMLINK;
|
||||
|
||||
if (dir->i_nlink >= EXOFS_LINK_MAX)
|
||||
goto out;
|
||||
|
||||
inode_inc_link_count(dir);
|
||||
|
||||
inode = exofs_new_inode(dir, S_IFDIR | mode);
|
||||
err = PTR_ERR(inode);
|
||||
if (IS_ERR(inode))
|
||||
goto out_dir;
|
||||
|
||||
inode->i_op = &exofs_dir_inode_operations;
|
||||
inode->i_fop = &exofs_dir_operations;
|
||||
inode->i_mapping->a_ops = &exofs_aops;
|
||||
|
||||
inode_inc_link_count(inode);
|
||||
|
||||
err = exofs_make_empty(inode, dir);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
|
||||
err = exofs_add_link(dentry, inode);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
|
||||
d_instantiate(dentry, inode);
|
||||
out:
|
||||
return err;
|
||||
|
||||
out_fail:
|
||||
inode_dec_link_count(inode);
|
||||
inode_dec_link_count(inode);
|
||||
iput(inode);
|
||||
out_dir:
|
||||
inode_dec_link_count(dir);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static int exofs_unlink(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
struct exofs_dir_entry *de;
|
||||
struct page *page;
|
||||
int err = -ENOENT;
|
||||
|
||||
de = exofs_find_entry(dir, dentry, &page);
|
||||
if (!de)
|
||||
goto out;
|
||||
|
||||
err = exofs_delete_entry(de, page);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
inode->i_ctime = dir->i_ctime;
|
||||
inode_dec_link_count(inode);
|
||||
err = 0;
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int exofs_rmdir(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
int err = -ENOTEMPTY;
|
||||
|
||||
if (exofs_empty_dir(inode)) {
|
||||
err = exofs_unlink(dir, dentry);
|
||||
if (!err) {
|
||||
inode->i_size = 0;
|
||||
inode_dec_link_count(inode);
|
||||
inode_dec_link_count(dir);
|
||||
}
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static int exofs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
||||
struct inode *new_dir, struct dentry *new_dentry)
|
||||
{
|
||||
struct inode *old_inode = old_dentry->d_inode;
|
||||
struct inode *new_inode = new_dentry->d_inode;
|
||||
struct page *dir_page = NULL;
|
||||
struct exofs_dir_entry *dir_de = NULL;
|
||||
struct page *old_page;
|
||||
struct exofs_dir_entry *old_de;
|
||||
int err = -ENOENT;
|
||||
|
||||
old_de = exofs_find_entry(old_dir, old_dentry, &old_page);
|
||||
if (!old_de)
|
||||
goto out;
|
||||
|
||||
if (S_ISDIR(old_inode->i_mode)) {
|
||||
err = -EIO;
|
||||
dir_de = exofs_dotdot(old_inode, &dir_page);
|
||||
if (!dir_de)
|
||||
goto out_old;
|
||||
}
|
||||
|
||||
if (new_inode) {
|
||||
struct page *new_page;
|
||||
struct exofs_dir_entry *new_de;
|
||||
|
||||
err = -ENOTEMPTY;
|
||||
if (dir_de && !exofs_empty_dir(new_inode))
|
||||
goto out_dir;
|
||||
|
||||
err = -ENOENT;
|
||||
new_de = exofs_find_entry(new_dir, new_dentry, &new_page);
|
||||
if (!new_de)
|
||||
goto out_dir;
|
||||
inode_inc_link_count(old_inode);
|
||||
err = exofs_set_link(new_dir, new_de, new_page, old_inode);
|
||||
new_inode->i_ctime = CURRENT_TIME;
|
||||
if (dir_de)
|
||||
drop_nlink(new_inode);
|
||||
inode_dec_link_count(new_inode);
|
||||
if (err)
|
||||
goto out_dir;
|
||||
} else {
|
||||
if (dir_de) {
|
||||
err = -EMLINK;
|
||||
if (new_dir->i_nlink >= EXOFS_LINK_MAX)
|
||||
goto out_dir;
|
||||
}
|
||||
inode_inc_link_count(old_inode);
|
||||
err = exofs_add_link(new_dentry, old_inode);
|
||||
if (err) {
|
||||
inode_dec_link_count(old_inode);
|
||||
goto out_dir;
|
||||
}
|
||||
if (dir_de)
|
||||
inode_inc_link_count(new_dir);
|
||||
}
|
||||
|
||||
old_inode->i_ctime = CURRENT_TIME;
|
||||
|
||||
exofs_delete_entry(old_de, old_page);
|
||||
inode_dec_link_count(old_inode);
|
||||
|
||||
if (dir_de) {
|
||||
err = exofs_set_link(old_inode, dir_de, dir_page, new_dir);
|
||||
inode_dec_link_count(old_dir);
|
||||
if (err)
|
||||
goto out_dir;
|
||||
}
|
||||
return 0;
|
||||
|
||||
|
||||
out_dir:
|
||||
if (dir_de) {
|
||||
kunmap(dir_page);
|
||||
page_cache_release(dir_page);
|
||||
}
|
||||
out_old:
|
||||
kunmap(old_page);
|
||||
page_cache_release(old_page);
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
const struct inode_operations exofs_dir_inode_operations = {
|
||||
.create = exofs_create,
|
||||
.lookup = exofs_lookup,
|
||||
.link = exofs_link,
|
||||
.unlink = exofs_unlink,
|
||||
.symlink = exofs_symlink,
|
||||
.mkdir = exofs_mkdir,
|
||||
.rmdir = exofs_rmdir,
|
||||
.mknod = exofs_mknod,
|
||||
.rename = exofs_rename,
|
||||
.setattr = exofs_setattr,
|
||||
};
|
||||
|
||||
const struct inode_operations exofs_special_inode_operations = {
|
||||
.setattr = exofs_setattr,
|
||||
};
|
||||
Загрузка…
Ссылка в новой задаче