mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 04:36:40 +07:00
265de8ce3d
Fix the callback jffs2 passes to read_cache_page to actually have the proper type expected. Casting around function pointers can easily hide typing bugs, and defeats control flow protection. Link: http://lkml.kernel.org/r/20190520055731.24538-4-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
763 lines
20 KiB
C
763 lines
20 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2001-2007 Red Hat, Inc.
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* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/capability.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/cred.h>
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/mtd/mtd.h>
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#include <linux/pagemap.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/vfs.h>
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#include <linux/crc32.h>
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#include "nodelist.h"
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static int jffs2_flash_setup(struct jffs2_sb_info *c);
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int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
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{
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struct jffs2_full_dnode *old_metadata, *new_metadata;
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struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
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struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
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struct jffs2_raw_inode *ri;
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union jffs2_device_node dev;
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unsigned char *mdata = NULL;
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int mdatalen = 0;
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unsigned int ivalid;
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uint32_t alloclen;
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int ret;
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int alloc_type = ALLOC_NORMAL;
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jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino);
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/* Special cases - we don't want more than one data node
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for these types on the medium at any time. So setattr
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must read the original data associated with the node
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(i.e. the device numbers or the target name) and write
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it out again with the appropriate data attached */
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if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
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/* For these, we don't actually need to read the old node */
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mdatalen = jffs2_encode_dev(&dev, inode->i_rdev);
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mdata = (char *)&dev;
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jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n",
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__func__, mdatalen);
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} else if (S_ISLNK(inode->i_mode)) {
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mutex_lock(&f->sem);
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mdatalen = f->metadata->size;
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mdata = kmalloc(f->metadata->size, GFP_USER);
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if (!mdata) {
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mutex_unlock(&f->sem);
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return -ENOMEM;
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}
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ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
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if (ret) {
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mutex_unlock(&f->sem);
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kfree(mdata);
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return ret;
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}
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mutex_unlock(&f->sem);
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jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n",
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__func__, mdatalen);
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}
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ri = jffs2_alloc_raw_inode();
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if (!ri) {
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if (S_ISLNK(inode->i_mode))
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kfree(mdata);
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return -ENOMEM;
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}
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ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen,
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ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
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if (ret) {
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jffs2_free_raw_inode(ri);
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if (S_ISLNK(inode->i_mode))
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kfree(mdata);
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return ret;
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}
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mutex_lock(&f->sem);
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ivalid = iattr->ia_valid;
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ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
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ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
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ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
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ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
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ri->ino = cpu_to_je32(inode->i_ino);
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ri->version = cpu_to_je32(++f->highest_version);
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ri->uid = cpu_to_je16((ivalid & ATTR_UID)?
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from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode));
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ri->gid = cpu_to_je16((ivalid & ATTR_GID)?
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from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode));
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if (ivalid & ATTR_MODE)
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ri->mode = cpu_to_jemode(iattr->ia_mode);
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else
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ri->mode = cpu_to_jemode(inode->i_mode);
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ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
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ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
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ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
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ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));
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ri->offset = cpu_to_je32(0);
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ri->csize = ri->dsize = cpu_to_je32(mdatalen);
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ri->compr = JFFS2_COMPR_NONE;
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if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
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/* It's an extension. Make it a hole node */
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ri->compr = JFFS2_COMPR_ZERO;
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ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
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ri->offset = cpu_to_je32(inode->i_size);
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} else if (ivalid & ATTR_SIZE && !iattr->ia_size) {
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/* For truncate-to-zero, treat it as deletion because
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it'll always be obsoleting all previous nodes */
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alloc_type = ALLOC_DELETION;
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}
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ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
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if (mdatalen)
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ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
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else
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ri->data_crc = cpu_to_je32(0);
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new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type);
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if (S_ISLNK(inode->i_mode))
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kfree(mdata);
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if (IS_ERR(new_metadata)) {
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jffs2_complete_reservation(c);
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jffs2_free_raw_inode(ri);
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mutex_unlock(&f->sem);
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return PTR_ERR(new_metadata);
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}
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/* It worked. Update the inode */
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inode->i_atime = ITIME(je32_to_cpu(ri->atime));
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inode->i_ctime = ITIME(je32_to_cpu(ri->ctime));
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inode->i_mtime = ITIME(je32_to_cpu(ri->mtime));
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inode->i_mode = jemode_to_cpu(ri->mode);
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i_uid_write(inode, je16_to_cpu(ri->uid));
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i_gid_write(inode, je16_to_cpu(ri->gid));
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old_metadata = f->metadata;
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if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
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jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size);
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if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
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jffs2_add_full_dnode_to_inode(c, f, new_metadata);
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inode->i_size = iattr->ia_size;
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inode->i_blocks = (inode->i_size + 511) >> 9;
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f->metadata = NULL;
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} else {
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f->metadata = new_metadata;
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}
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if (old_metadata) {
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jffs2_mark_node_obsolete(c, old_metadata->raw);
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jffs2_free_full_dnode(old_metadata);
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}
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jffs2_free_raw_inode(ri);
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mutex_unlock(&f->sem);
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jffs2_complete_reservation(c);
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/* We have to do the truncate_setsize() without f->sem held, since
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some pages may be locked and waiting for it in readpage().
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We are protected from a simultaneous write() extending i_size
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back past iattr->ia_size, because do_truncate() holds the
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generic inode semaphore. */
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if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) {
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truncate_setsize(inode, iattr->ia_size);
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inode->i_blocks = (inode->i_size + 511) >> 9;
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}
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return 0;
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}
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int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
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{
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struct inode *inode = d_inode(dentry);
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int rc;
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rc = setattr_prepare(dentry, iattr);
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if (rc)
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return rc;
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rc = jffs2_do_setattr(inode, iattr);
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if (!rc && (iattr->ia_valid & ATTR_MODE))
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rc = posix_acl_chmod(inode, inode->i_mode);
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return rc;
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}
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int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb);
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unsigned long avail;
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buf->f_type = JFFS2_SUPER_MAGIC;
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buf->f_bsize = 1 << PAGE_SHIFT;
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buf->f_blocks = c->flash_size >> PAGE_SHIFT;
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buf->f_files = 0;
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buf->f_ffree = 0;
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buf->f_namelen = JFFS2_MAX_NAME_LEN;
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buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC;
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buf->f_fsid.val[1] = c->mtd->index;
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spin_lock(&c->erase_completion_lock);
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avail = c->dirty_size + c->free_size;
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if (avail > c->sector_size * c->resv_blocks_write)
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avail -= c->sector_size * c->resv_blocks_write;
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else
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avail = 0;
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spin_unlock(&c->erase_completion_lock);
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buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
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return 0;
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}
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void jffs2_evict_inode (struct inode *inode)
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{
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/* We can forget about this inode for now - drop all
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* the nodelists associated with it, etc.
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*/
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struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
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struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
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jffs2_dbg(1, "%s(): ino #%lu mode %o\n",
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__func__, inode->i_ino, inode->i_mode);
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truncate_inode_pages_final(&inode->i_data);
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clear_inode(inode);
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jffs2_do_clear_inode(c, f);
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}
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struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
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{
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struct jffs2_inode_info *f;
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struct jffs2_sb_info *c;
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struct jffs2_raw_inode latest_node;
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union jffs2_device_node jdev;
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struct inode *inode;
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dev_t rdev = 0;
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int ret;
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jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino);
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inode = iget_locked(sb, ino);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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f = JFFS2_INODE_INFO(inode);
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c = JFFS2_SB_INFO(inode->i_sb);
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jffs2_init_inode_info(f);
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mutex_lock(&f->sem);
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ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
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if (ret)
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goto error;
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inode->i_mode = jemode_to_cpu(latest_node.mode);
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i_uid_write(inode, je16_to_cpu(latest_node.uid));
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i_gid_write(inode, je16_to_cpu(latest_node.gid));
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inode->i_size = je32_to_cpu(latest_node.isize);
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inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
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inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
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inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime));
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set_nlink(inode, f->inocache->pino_nlink);
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inode->i_blocks = (inode->i_size + 511) >> 9;
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switch (inode->i_mode & S_IFMT) {
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case S_IFLNK:
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inode->i_op = &jffs2_symlink_inode_operations;
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inode->i_link = f->target;
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break;
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case S_IFDIR:
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{
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struct jffs2_full_dirent *fd;
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set_nlink(inode, 2); /* parent and '.' */
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for (fd=f->dents; fd; fd = fd->next) {
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if (fd->type == DT_DIR && fd->ino)
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inc_nlink(inode);
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}
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/* Root dir gets i_nlink 3 for some reason */
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if (inode->i_ino == 1)
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inc_nlink(inode);
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inode->i_op = &jffs2_dir_inode_operations;
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inode->i_fop = &jffs2_dir_operations;
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break;
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}
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case S_IFREG:
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inode->i_op = &jffs2_file_inode_operations;
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inode->i_fop = &jffs2_file_operations;
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inode->i_mapping->a_ops = &jffs2_file_address_operations;
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inode->i_mapping->nrpages = 0;
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break;
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case S_IFBLK:
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case S_IFCHR:
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/* Read the device numbers from the media */
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if (f->metadata->size != sizeof(jdev.old_id) &&
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f->metadata->size != sizeof(jdev.new_id)) {
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pr_notice("Device node has strange size %d\n",
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f->metadata->size);
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goto error_io;
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}
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jffs2_dbg(1, "Reading device numbers from flash\n");
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ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size);
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if (ret < 0) {
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/* Eep */
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pr_notice("Read device numbers for inode %lu failed\n",
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(unsigned long)inode->i_ino);
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goto error;
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}
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if (f->metadata->size == sizeof(jdev.old_id))
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rdev = old_decode_dev(je16_to_cpu(jdev.old_id));
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else
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rdev = new_decode_dev(je32_to_cpu(jdev.new_id));
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/* fall through */
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case S_IFSOCK:
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case S_IFIFO:
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inode->i_op = &jffs2_file_inode_operations;
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init_special_inode(inode, inode->i_mode, rdev);
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break;
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default:
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pr_warn("%s(): Bogus i_mode %o for ino %lu\n",
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__func__, inode->i_mode, (unsigned long)inode->i_ino);
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}
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mutex_unlock(&f->sem);
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jffs2_dbg(1, "jffs2_read_inode() returning\n");
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unlock_new_inode(inode);
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return inode;
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error_io:
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ret = -EIO;
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error:
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mutex_unlock(&f->sem);
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iget_failed(inode);
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return ERR_PTR(ret);
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}
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void jffs2_dirty_inode(struct inode *inode, int flags)
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{
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struct iattr iattr;
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if (!(inode->i_state & I_DIRTY_DATASYNC)) {
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jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n",
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__func__, inode->i_ino);
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return;
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}
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jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n",
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__func__, inode->i_ino);
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iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME;
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iattr.ia_mode = inode->i_mode;
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iattr.ia_uid = inode->i_uid;
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iattr.ia_gid = inode->i_gid;
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iattr.ia_atime = inode->i_atime;
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iattr.ia_mtime = inode->i_mtime;
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iattr.ia_ctime = inode->i_ctime;
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jffs2_do_setattr(inode, &iattr);
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}
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int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data)
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{
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struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
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if (c->flags & JFFS2_SB_FLAG_RO && !sb_rdonly(sb))
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return -EROFS;
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/* We stop if it was running, then restart if it needs to.
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This also catches the case where it was stopped and this
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is just a remount to restart it.
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Flush the writebuffer, if neccecary, else we loose it */
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if (!sb_rdonly(sb)) {
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jffs2_stop_garbage_collect_thread(c);
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mutex_lock(&c->alloc_sem);
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jffs2_flush_wbuf_pad(c);
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mutex_unlock(&c->alloc_sem);
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}
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if (!(*flags & SB_RDONLY))
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jffs2_start_garbage_collect_thread(c);
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*flags |= SB_NOATIME;
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return 0;
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}
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/* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
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fill in the raw_inode while you're at it. */
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struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri)
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{
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struct inode *inode;
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struct super_block *sb = dir_i->i_sb;
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struct jffs2_sb_info *c;
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struct jffs2_inode_info *f;
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int ret;
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jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n",
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__func__, dir_i->i_ino, mode);
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c = JFFS2_SB_INFO(sb);
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inode = new_inode(sb);
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|
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
f = JFFS2_INODE_INFO(inode);
|
|
jffs2_init_inode_info(f);
|
|
mutex_lock(&f->sem);
|
|
|
|
memset(ri, 0, sizeof(*ri));
|
|
/* Set OS-specific defaults for new inodes */
|
|
ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid()));
|
|
|
|
if (dir_i->i_mode & S_ISGID) {
|
|
ri->gid = cpu_to_je16(i_gid_read(dir_i));
|
|
if (S_ISDIR(mode))
|
|
mode |= S_ISGID;
|
|
} else {
|
|
ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid()));
|
|
}
|
|
|
|
/* POSIX ACLs have to be processed now, at least partly.
|
|
The umask is only applied if there's no default ACL */
|
|
ret = jffs2_init_acl_pre(dir_i, inode, &mode);
|
|
if (ret) {
|
|
mutex_unlock(&f->sem);
|
|
make_bad_inode(inode);
|
|
iput(inode);
|
|
return ERR_PTR(ret);
|
|
}
|
|
ret = jffs2_do_new_inode (c, f, mode, ri);
|
|
if (ret) {
|
|
mutex_unlock(&f->sem);
|
|
make_bad_inode(inode);
|
|
iput(inode);
|
|
return ERR_PTR(ret);
|
|
}
|
|
set_nlink(inode, 1);
|
|
inode->i_ino = je32_to_cpu(ri->ino);
|
|
inode->i_mode = jemode_to_cpu(ri->mode);
|
|
i_gid_write(inode, je16_to_cpu(ri->gid));
|
|
i_uid_write(inode, je16_to_cpu(ri->uid));
|
|
inode->i_atime = inode->i_ctime = inode->i_mtime = current_time(inode);
|
|
ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime));
|
|
|
|
inode->i_blocks = 0;
|
|
inode->i_size = 0;
|
|
|
|
if (insert_inode_locked(inode) < 0) {
|
|
mutex_unlock(&f->sem);
|
|
make_bad_inode(inode);
|
|
iput(inode);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
return inode;
|
|
}
|
|
|
|
static int calculate_inocache_hashsize(uint32_t flash_size)
|
|
{
|
|
/*
|
|
* Pick a inocache hash size based on the size of the medium.
|
|
* Count how many megabytes we're dealing with, apply a hashsize twice
|
|
* that size, but rounding down to the usual big powers of 2. And keep
|
|
* to sensible bounds.
|
|
*/
|
|
|
|
int size_mb = flash_size / 1024 / 1024;
|
|
int hashsize = (size_mb * 2) & ~0x3f;
|
|
|
|
if (hashsize < INOCACHE_HASHSIZE_MIN)
|
|
return INOCACHE_HASHSIZE_MIN;
|
|
if (hashsize > INOCACHE_HASHSIZE_MAX)
|
|
return INOCACHE_HASHSIZE_MAX;
|
|
|
|
return hashsize;
|
|
}
|
|
|
|
int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct jffs2_sb_info *c;
|
|
struct inode *root_i;
|
|
int ret;
|
|
size_t blocks;
|
|
|
|
c = JFFS2_SB_INFO(sb);
|
|
|
|
/* Do not support the MLC nand */
|
|
if (c->mtd->type == MTD_MLCNANDFLASH)
|
|
return -EINVAL;
|
|
|
|
#ifndef CONFIG_JFFS2_FS_WRITEBUFFER
|
|
if (c->mtd->type == MTD_NANDFLASH) {
|
|
pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n");
|
|
return -EINVAL;
|
|
}
|
|
if (c->mtd->type == MTD_DATAFLASH) {
|
|
pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n");
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
c->flash_size = c->mtd->size;
|
|
c->sector_size = c->mtd->erasesize;
|
|
blocks = c->flash_size / c->sector_size;
|
|
|
|
/*
|
|
* Size alignment check
|
|
*/
|
|
if ((c->sector_size * blocks) != c->flash_size) {
|
|
c->flash_size = c->sector_size * blocks;
|
|
pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n",
|
|
c->flash_size / 1024);
|
|
}
|
|
|
|
if (c->flash_size < 5*c->sector_size) {
|
|
pr_err("Too few erase blocks (%d)\n",
|
|
c->flash_size / c->sector_size);
|
|
return -EINVAL;
|
|
}
|
|
|
|
c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
|
|
|
|
/* NAND (or other bizarre) flash... do setup accordingly */
|
|
ret = jffs2_flash_setup(c);
|
|
if (ret)
|
|
return ret;
|
|
|
|
c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size);
|
|
c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
|
|
if (!c->inocache_list) {
|
|
ret = -ENOMEM;
|
|
goto out_wbuf;
|
|
}
|
|
|
|
jffs2_init_xattr_subsystem(c);
|
|
|
|
if ((ret = jffs2_do_mount_fs(c)))
|
|
goto out_inohash;
|
|
|
|
jffs2_dbg(1, "%s(): Getting root inode\n", __func__);
|
|
root_i = jffs2_iget(sb, 1);
|
|
if (IS_ERR(root_i)) {
|
|
jffs2_dbg(1, "get root inode failed\n");
|
|
ret = PTR_ERR(root_i);
|
|
goto out_root;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
|
|
jffs2_dbg(1, "%s(): d_make_root()\n", __func__);
|
|
sb->s_root = d_make_root(root_i);
|
|
if (!sb->s_root)
|
|
goto out_root;
|
|
|
|
sb->s_maxbytes = 0xFFFFFFFF;
|
|
sb->s_blocksize = PAGE_SIZE;
|
|
sb->s_blocksize_bits = PAGE_SHIFT;
|
|
sb->s_magic = JFFS2_SUPER_MAGIC;
|
|
if (!sb_rdonly(sb))
|
|
jffs2_start_garbage_collect_thread(c);
|
|
return 0;
|
|
|
|
out_root:
|
|
jffs2_free_ino_caches(c);
|
|
jffs2_free_raw_node_refs(c);
|
|
kvfree(c->blocks);
|
|
out_inohash:
|
|
jffs2_clear_xattr_subsystem(c);
|
|
kfree(c->inocache_list);
|
|
out_wbuf:
|
|
jffs2_flash_cleanup(c);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void jffs2_gc_release_inode(struct jffs2_sb_info *c,
|
|
struct jffs2_inode_info *f)
|
|
{
|
|
iput(OFNI_EDONI_2SFFJ(f));
|
|
}
|
|
|
|
struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
|
|
int inum, int unlinked)
|
|
{
|
|
struct inode *inode;
|
|
struct jffs2_inode_cache *ic;
|
|
|
|
if (unlinked) {
|
|
/* The inode has zero nlink but its nodes weren't yet marked
|
|
obsolete. This has to be because we're still waiting for
|
|
the final (close() and) iput() to happen.
|
|
|
|
There's a possibility that the final iput() could have
|
|
happened while we were contemplating. In order to ensure
|
|
that we don't cause a new read_inode() (which would fail)
|
|
for the inode in question, we use ilookup() in this case
|
|
instead of iget().
|
|
|
|
The nlink can't _become_ zero at this point because we're
|
|
holding the alloc_sem, and jffs2_do_unlink() would also
|
|
need that while decrementing nlink on any inode.
|
|
*/
|
|
inode = ilookup(OFNI_BS_2SFFJ(c), inum);
|
|
if (!inode) {
|
|
jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n",
|
|
inum);
|
|
|
|
spin_lock(&c->inocache_lock);
|
|
ic = jffs2_get_ino_cache(c, inum);
|
|
if (!ic) {
|
|
jffs2_dbg(1, "Inode cache for ino #%u is gone\n",
|
|
inum);
|
|
spin_unlock(&c->inocache_lock);
|
|
return NULL;
|
|
}
|
|
if (ic->state != INO_STATE_CHECKEDABSENT) {
|
|
/* Wait for progress. Don't just loop */
|
|
jffs2_dbg(1, "Waiting for ino #%u in state %d\n",
|
|
ic->ino, ic->state);
|
|
sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);
|
|
} else {
|
|
spin_unlock(&c->inocache_lock);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
} else {
|
|
/* Inode has links to it still; they're not going away because
|
|
jffs2_do_unlink() would need the alloc_sem and we have it.
|
|
Just iget() it, and if read_inode() is necessary that's OK.
|
|
*/
|
|
inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
}
|
|
if (is_bad_inode(inode)) {
|
|
pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n",
|
|
inum, unlinked);
|
|
/* NB. This will happen again. We need to do something appropriate here. */
|
|
iput(inode);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
|
|
return JFFS2_INODE_INFO(inode);
|
|
}
|
|
|
|
unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
|
|
struct jffs2_inode_info *f,
|
|
unsigned long offset,
|
|
unsigned long *priv)
|
|
{
|
|
struct inode *inode = OFNI_EDONI_2SFFJ(f);
|
|
struct page *pg;
|
|
|
|
pg = read_cache_page(inode->i_mapping, offset >> PAGE_SHIFT,
|
|
jffs2_do_readpage_unlock, inode);
|
|
if (IS_ERR(pg))
|
|
return (void *)pg;
|
|
|
|
*priv = (unsigned long)pg;
|
|
return kmap(pg);
|
|
}
|
|
|
|
void jffs2_gc_release_page(struct jffs2_sb_info *c,
|
|
unsigned char *ptr,
|
|
unsigned long *priv)
|
|
{
|
|
struct page *pg = (void *)*priv;
|
|
|
|
kunmap(pg);
|
|
put_page(pg);
|
|
}
|
|
|
|
static int jffs2_flash_setup(struct jffs2_sb_info *c) {
|
|
int ret = 0;
|
|
|
|
if (jffs2_cleanmarker_oob(c)) {
|
|
/* NAND flash... do setup accordingly */
|
|
ret = jffs2_nand_flash_setup(c);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* and Dataflash */
|
|
if (jffs2_dataflash(c)) {
|
|
ret = jffs2_dataflash_setup(c);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* and Intel "Sibley" flash */
|
|
if (jffs2_nor_wbuf_flash(c)) {
|
|
ret = jffs2_nor_wbuf_flash_setup(c);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* and an UBI volume */
|
|
if (jffs2_ubivol(c)) {
|
|
ret = jffs2_ubivol_setup(c);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
|
|
|
|
if (jffs2_cleanmarker_oob(c)) {
|
|
jffs2_nand_flash_cleanup(c);
|
|
}
|
|
|
|
/* and DataFlash */
|
|
if (jffs2_dataflash(c)) {
|
|
jffs2_dataflash_cleanup(c);
|
|
}
|
|
|
|
/* and Intel "Sibley" flash */
|
|
if (jffs2_nor_wbuf_flash(c)) {
|
|
jffs2_nor_wbuf_flash_cleanup(c);
|
|
}
|
|
|
|
/* and an UBI volume */
|
|
if (jffs2_ubivol(c)) {
|
|
jffs2_ubivol_cleanup(c);
|
|
}
|
|
}
|