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740 lines
19 KiB
740 lines
19 KiB
/* |
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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 <[email protected]> |
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* |
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* Created by David Woodhouse <[email protected]> |
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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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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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/fs_context.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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|
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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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|
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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 user_namespace *mnt_userns, struct dentry *dentry, |
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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(&init_user_ns, 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(&init_user_ns, 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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fallthrough; |
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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, struct fs_context *fc) |
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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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|
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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 (!(fc->sb_flags & SB_RDONLY)) |
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jffs2_start_garbage_collect_thread(c); |
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fc->sb_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) |
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return ERR_PTR(-ENOMEM); |
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f = JFFS2_INODE_INFO(inode); |
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jffs2_init_inode_info(f); |
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mutex_lock(&f->sem); |
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memset(ri, 0, sizeof(*ri)); |
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/* Set OS-specific defaults for new inodes */ |
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ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); |
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|
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if (dir_i->i_mode & S_ISGID) { |
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ri->gid = cpu_to_je16(i_gid_read(dir_i)); |
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if (S_ISDIR(mode)) |
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mode |= S_ISGID; |
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} else { |
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ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); |
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} |
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|
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/* POSIX ACLs have to be processed now, at least partly. |
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The umask is only applied if there's no default ACL */ |
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ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
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if (ret) { |
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mutex_unlock(&f->sem); |
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make_bad_inode(inode); |
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iput(inode); |
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return ERR_PTR(ret); |
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} |
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ret = jffs2_do_new_inode (c, f, mode, ri); |
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if (ret) { |
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mutex_unlock(&f->sem); |
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make_bad_inode(inode); |
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iput(inode); |
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return ERR_PTR(ret); |
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} |
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set_nlink(inode, 1); |
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inode->i_ino = je32_to_cpu(ri->ino); |
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inode->i_mode = jemode_to_cpu(ri->mode); |
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i_gid_write(inode, je16_to_cpu(ri->gid)); |
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i_uid_write(inode, je16_to_cpu(ri->uid)); |
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inode->i_atime = inode->i_ctime = inode->i_mtime = current_time(inode); |
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ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); |
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|
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inode->i_blocks = 0; |
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inode->i_size = 0; |
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|
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if (insert_inode_locked(inode) < 0) { |
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mutex_unlock(&f->sem); |
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make_bad_inode(inode); |
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iput(inode); |
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return ERR_PTR(-EINVAL); |
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} |
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|
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return inode; |
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} |
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|
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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, struct fs_context *fc) |
|
{ |
|
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) { |
|
errorf(fc, "Cannot operate on NAND flash unless jffs2 NAND support is compiled in"); |
|
return -EINVAL; |
|
} |
|
if (c->mtd->type == MTD_DATAFLASH) { |
|
errorf(fc, "Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in"); |
|
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; |
|
infof(fc, "Flash size not aligned to erasesize, reducing to %dKiB", |
|
c->flash_size / 1024); |
|
} |
|
|
|
if (c->flash_size < 5*c->sector_size) { |
|
errorf(fc, "Too few erase blocks (%d)", |
|
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; |
|
sb->s_time_min = 0; |
|
sb->s_time_max = U32_MAX; |
|
|
|
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); |
|
jffs2_clear_xattr_subsystem(c); |
|
out_inohash: |
|
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); |
|
} |
|
|
|
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); |
|
} |
|
}
|
|
|