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484 lines
18 KiB
484 lines
18 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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*
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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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#ifndef __JFFS2_NODELIST_H__
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#define __JFFS2_NODELIST_H__
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/jffs2.h>
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#include "jffs2_fs_sb.h"
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#include "jffs2_fs_i.h"
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#include "xattr.h"
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#include "acl.h"
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#include "summary.h"
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#ifdef __ECOS
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#include "os-ecos.h"
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#else
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#include "os-linux.h"
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#endif
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#define JFFS2_NATIVE_ENDIAN
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/* Note we handle mode bits conversion from JFFS2 (i.e. Linux) to/from
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whatever OS we're actually running on here too. */
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#if defined(JFFS2_NATIVE_ENDIAN)
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#define cpu_to_je16(x) ((jint16_t){x})
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#define cpu_to_je32(x) ((jint32_t){x})
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#define cpu_to_jemode(x) ((jmode_t){os_to_jffs2_mode(x)})
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#define constant_cpu_to_je16(x) ((jint16_t){x})
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#define constant_cpu_to_je32(x) ((jint32_t){x})
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#define je16_to_cpu(x) ((x).v16)
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#define je32_to_cpu(x) ((x).v32)
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#define jemode_to_cpu(x) (jffs2_to_os_mode((x).m))
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#elif defined(JFFS2_BIG_ENDIAN)
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#define cpu_to_je16(x) ((jint16_t){cpu_to_be16(x)})
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#define cpu_to_je32(x) ((jint32_t){cpu_to_be32(x)})
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#define cpu_to_jemode(x) ((jmode_t){cpu_to_be32(os_to_jffs2_mode(x))})
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#define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_be16(x)})
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#define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_be32(x)})
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#define je16_to_cpu(x) (be16_to_cpu(x.v16))
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#define je32_to_cpu(x) (be32_to_cpu(x.v32))
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#define jemode_to_cpu(x) (be32_to_cpu(jffs2_to_os_mode((x).m)))
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#elif defined(JFFS2_LITTLE_ENDIAN)
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#define cpu_to_je16(x) ((jint16_t){cpu_to_le16(x)})
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#define cpu_to_je32(x) ((jint32_t){cpu_to_le32(x)})
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#define cpu_to_jemode(x) ((jmode_t){cpu_to_le32(os_to_jffs2_mode(x))})
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#define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_le16(x)})
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#define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_le32(x)})
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#define je16_to_cpu(x) (le16_to_cpu(x.v16))
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#define je32_to_cpu(x) (le32_to_cpu(x.v32))
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#define jemode_to_cpu(x) (le32_to_cpu(jffs2_to_os_mode((x).m)))
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#else
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#error wibble
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#endif
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/* The minimal node header size */
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#define JFFS2_MIN_NODE_HEADER sizeof(struct jffs2_raw_dirent)
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/*
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This is all we need to keep in-core for each raw node during normal
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operation. As and when we do read_inode on a particular inode, we can
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scan the nodes which are listed for it and build up a proper map of
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which nodes are currently valid. JFFSv1 always used to keep that whole
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map in core for each inode.
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*/
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struct jffs2_raw_node_ref
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{
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struct jffs2_raw_node_ref *next_in_ino; /* Points to the next raw_node_ref
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for this object. If this _is_ the last, it points to the inode_cache,
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xattr_ref or xattr_datum instead. The common part of those structures
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has NULL in the first word. See jffs2_raw_ref_to_ic() below */
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uint32_t flash_offset;
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#undef TEST_TOTLEN
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#ifdef TEST_TOTLEN
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uint32_t __totlen; /* This may die; use ref_totlen(c, jeb, ) below */
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#endif
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};
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#define REF_LINK_NODE ((int32_t)-1)
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#define REF_EMPTY_NODE ((int32_t)-2)
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/* Use blocks of about 256 bytes */
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#define REFS_PER_BLOCK ((255/sizeof(struct jffs2_raw_node_ref))-1)
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static inline struct jffs2_raw_node_ref *ref_next(struct jffs2_raw_node_ref *ref)
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{
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ref++;
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/* Link to another block of refs */
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if (ref->flash_offset == REF_LINK_NODE) {
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ref = ref->next_in_ino;
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if (!ref)
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return ref;
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}
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/* End of chain */
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if (ref->flash_offset == REF_EMPTY_NODE)
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return NULL;
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return ref;
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}
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static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw)
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{
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while(raw->next_in_ino)
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raw = raw->next_in_ino;
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/* NB. This can be a jffs2_xattr_datum or jffs2_xattr_ref and
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not actually a jffs2_inode_cache. Check ->class */
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return ((struct jffs2_inode_cache *)raw);
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}
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/* flash_offset & 3 always has to be zero, because nodes are
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always aligned at 4 bytes. So we have a couple of extra bits
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to play with, which indicate the node's status; see below: */
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#define REF_UNCHECKED 0 /* We haven't yet checked the CRC or built its inode */
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#define REF_OBSOLETE 1 /* Obsolete, can be completely ignored */
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#define REF_PRISTINE 2 /* Completely clean. GC without looking */
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#define REF_NORMAL 3 /* Possibly overlapped. Read the page and write again on GC */
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#define ref_flags(ref) ((ref)->flash_offset & 3)
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#define ref_offset(ref) ((ref)->flash_offset & ~3)
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#define ref_obsolete(ref) (((ref)->flash_offset & 3) == REF_OBSOLETE)
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#define mark_ref_normal(ref) do { (ref)->flash_offset = ref_offset(ref) | REF_NORMAL; } while(0)
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/* Dirent nodes should be REF_PRISTINE only if they are not a deletion
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dirent. Deletion dirents should be REF_NORMAL so that GC gets to
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throw them away when appropriate */
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#define dirent_node_state(rd) ( (je32_to_cpu((rd)->ino)?REF_PRISTINE:REF_NORMAL) )
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/* NB: REF_PRISTINE for an inode-less node (ref->next_in_ino == NULL) indicates
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it is an unknown node of type JFFS2_NODETYPE_RWCOMPAT_COPY, so it'll get
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copied. If you need to do anything different to GC inode-less nodes, then
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you need to modify gc.c accordingly. */
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/* For each inode in the filesystem, we need to keep a record of
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nlink, because it would be a PITA to scan the whole directory tree
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at read_inode() time to calculate it, and to keep sufficient information
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in the raw_node_ref (basically both parent and child inode number for
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dirent nodes) would take more space than this does. We also keep
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a pointer to the first physical node which is part of this inode, too.
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*/
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struct jffs2_inode_cache {
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/* First part of structure is shared with other objects which
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can terminate the raw node refs' next_in_ino list -- which
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currently struct jffs2_xattr_datum and struct jffs2_xattr_ref. */
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struct jffs2_full_dirent *scan_dents; /* Used during scan to hold
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temporary lists of dirents, and later must be set to
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NULL to mark the end of the raw_node_ref->next_in_ino
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chain. */
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struct jffs2_raw_node_ref *nodes;
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uint8_t class; /* It's used for identification */
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/* end of shared structure */
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uint8_t flags;
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uint16_t state;
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uint32_t ino;
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struct jffs2_inode_cache *next;
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#ifdef CONFIG_JFFS2_FS_XATTR
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struct jffs2_xattr_ref *xref;
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#endif
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uint32_t pino_nlink; /* Directories store parent inode
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here; other inodes store nlink.
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Zero always means that it's
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completely unlinked. */
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};
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/* Inode states for 'state' above. We need the 'GC' state to prevent
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someone from doing a read_inode() while we're moving a 'REF_PRISTINE'
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node without going through all the iget() nonsense */
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#define INO_STATE_UNCHECKED 0 /* CRC checks not yet done */
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#define INO_STATE_CHECKING 1 /* CRC checks in progress */
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#define INO_STATE_PRESENT 2 /* In core */
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#define INO_STATE_CHECKEDABSENT 3 /* Checked, cleared again */
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#define INO_STATE_GC 4 /* GCing a 'pristine' node */
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#define INO_STATE_READING 5 /* In read_inode() */
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#define INO_STATE_CLEARING 6 /* In clear_inode() */
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#define INO_FLAGS_XATTR_CHECKED 0x01 /* has no duplicate xattr_ref */
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#define INO_FLAGS_IS_DIR 0x02 /* is a directory */
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#define RAWNODE_CLASS_INODE_CACHE 0
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#define RAWNODE_CLASS_XATTR_DATUM 1
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#define RAWNODE_CLASS_XATTR_REF 2
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#define INOCACHE_HASHSIZE_MIN 128
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#define INOCACHE_HASHSIZE_MAX 1024
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#define write_ofs(c) ((c)->nextblock->offset + (c)->sector_size - (c)->nextblock->free_size)
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/*
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Larger representation of a raw node, kept in-core only when the
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struct inode for this particular ino is instantiated.
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*/
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struct jffs2_full_dnode
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{
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struct jffs2_raw_node_ref *raw;
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uint32_t ofs; /* The offset to which the data of this node belongs */
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uint32_t size;
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uint32_t frags; /* Number of fragments which currently refer
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to this node. When this reaches zero,
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the node is obsolete. */
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};
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/*
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Even larger representation of a raw node, kept in-core only while
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we're actually building up the original map of which nodes go where,
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in read_inode()
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*/
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struct jffs2_tmp_dnode_info
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{
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struct rb_node rb;
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struct jffs2_full_dnode *fn;
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uint32_t version;
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uint32_t data_crc;
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uint32_t partial_crc;
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uint32_t csize;
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uint16_t overlapped;
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};
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/* Temporary data structure used during readinode. */
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struct jffs2_readinode_info
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{
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struct rb_root tn_root;
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struct jffs2_tmp_dnode_info *mdata_tn;
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uint32_t highest_version;
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uint32_t latest_mctime;
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uint32_t mctime_ver;
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struct jffs2_full_dirent *fds;
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struct jffs2_raw_node_ref *latest_ref;
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};
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struct jffs2_full_dirent
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{
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union {
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struct jffs2_raw_node_ref *raw;
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struct jffs2_inode_cache *ic; /* Just during part of build */
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};
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struct jffs2_full_dirent *next;
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uint32_t version;
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uint32_t ino; /* == zero for unlink */
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unsigned int nhash;
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unsigned char type;
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unsigned char name[0];
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};
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/*
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Fragments - used to build a map of which raw node to obtain
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data from for each part of the ino
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*/
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struct jffs2_node_frag
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{
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struct rb_node rb;
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struct jffs2_full_dnode *node; /* NULL for holes */
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uint32_t size;
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uint32_t ofs; /* The offset to which this fragment belongs */
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};
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struct jffs2_eraseblock
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{
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struct list_head list;
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int bad_count;
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uint32_t offset; /* of this block in the MTD */
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uint32_t unchecked_size;
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uint32_t used_size;
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uint32_t dirty_size;
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uint32_t wasted_size;
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uint32_t free_size; /* Note that sector_size - free_size
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is the address of the first free space */
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uint32_t allocated_refs;
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struct jffs2_raw_node_ref *first_node;
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struct jffs2_raw_node_ref *last_node;
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struct jffs2_raw_node_ref *gc_node; /* Next node to be garbage collected */
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};
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static inline int jffs2_blocks_use_vmalloc(struct jffs2_sb_info *c)
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{
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return ((c->flash_size / c->sector_size) * sizeof (struct jffs2_eraseblock)) > (128 * 1024);
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}
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#define ref_totlen(a, b, c) __jffs2_ref_totlen((a), (b), (c))
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#define ALLOC_NORMAL 0 /* Normal allocation */
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#define ALLOC_DELETION 1 /* Deletion node. Best to allow it */
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#define ALLOC_GC 2 /* Space requested for GC. Give it or die */
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#define ALLOC_NORETRY 3 /* For jffs2_write_dnode: On failure, return -EAGAIN instead of retrying */
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/* How much dirty space before it goes on the very_dirty_list */
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#define VERYDIRTY(c, size) ((size) >= ((c)->sector_size / 2))
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/* check if dirty space is more than 255 Byte */
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#define ISDIRTY(size) ((size) > sizeof (struct jffs2_raw_inode) + JFFS2_MIN_DATA_LEN)
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#define PAD(x) (((x)+3)&~3)
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static inline int jffs2_encode_dev(union jffs2_device_node *jdev, dev_t rdev)
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{
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if (old_valid_dev(rdev)) {
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jdev->old_id = cpu_to_je16(old_encode_dev(rdev));
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return sizeof(jdev->old_id);
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} else {
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jdev->new_id = cpu_to_je32(new_encode_dev(rdev));
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return sizeof(jdev->new_id);
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}
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}
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static inline struct jffs2_node_frag *frag_first(struct rb_root *root)
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{
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struct rb_node *node = rb_first(root);
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if (!node)
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return NULL;
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return rb_entry(node, struct jffs2_node_frag, rb);
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}
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static inline struct jffs2_node_frag *frag_last(struct rb_root *root)
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{
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struct rb_node *node = rb_last(root);
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if (!node)
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return NULL;
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return rb_entry(node, struct jffs2_node_frag, rb);
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}
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#define frag_next(frag) rb_entry(rb_next(&(frag)->rb), struct jffs2_node_frag, rb)
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#define frag_prev(frag) rb_entry(rb_prev(&(frag)->rb), struct jffs2_node_frag, rb)
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#define frag_parent(frag) rb_entry(rb_parent(&(frag)->rb), struct jffs2_node_frag, rb)
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#define frag_left(frag) rb_entry((frag)->rb.rb_left, struct jffs2_node_frag, rb)
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#define frag_right(frag) rb_entry((frag)->rb.rb_right, struct jffs2_node_frag, rb)
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#define frag_erase(frag, list) rb_erase(&frag->rb, list);
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#define tn_next(tn) rb_entry(rb_next(&(tn)->rb), struct jffs2_tmp_dnode_info, rb)
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#define tn_prev(tn) rb_entry(rb_prev(&(tn)->rb), struct jffs2_tmp_dnode_info, rb)
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#define tn_parent(tn) rb_entry(rb_parent(&(tn)->rb), struct jffs2_tmp_dnode_info, rb)
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#define tn_left(tn) rb_entry((tn)->rb.rb_left, struct jffs2_tmp_dnode_info, rb)
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#define tn_right(tn) rb_entry((tn)->rb.rb_right, struct jffs2_tmp_dnode_info, rb)
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#define tn_erase(tn, list) rb_erase(&tn->rb, list);
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#define tn_last(list) rb_entry(rb_last(list), struct jffs2_tmp_dnode_info, rb)
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#define tn_first(list) rb_entry(rb_first(list), struct jffs2_tmp_dnode_info, rb)
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/* nodelist.c */
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void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list);
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void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state);
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struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino);
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void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new);
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void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old);
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void jffs2_free_ino_caches(struct jffs2_sb_info *c);
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void jffs2_free_raw_node_refs(struct jffs2_sb_info *c);
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struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset);
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void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c_delete);
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int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn);
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uint32_t jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size);
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struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c,
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struct jffs2_eraseblock *jeb,
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uint32_t ofs, uint32_t len,
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struct jffs2_inode_cache *ic);
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extern uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c,
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struct jffs2_eraseblock *jeb,
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struct jffs2_raw_node_ref *ref);
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/* nodemgmt.c */
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int jffs2_thread_should_wake(struct jffs2_sb_info *c);
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int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
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uint32_t *len, int prio, uint32_t sumsize);
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int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize,
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uint32_t *len, uint32_t sumsize);
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struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c,
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uint32_t ofs, uint32_t len,
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struct jffs2_inode_cache *ic);
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void jffs2_complete_reservation(struct jffs2_sb_info *c);
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void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *raw);
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/* write.c */
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int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri);
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struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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struct jffs2_raw_inode *ri, const unsigned char *data,
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uint32_t datalen, int alloc_mode);
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struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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struct jffs2_raw_dirent *rd, const unsigned char *name,
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uint32_t namelen, int alloc_mode);
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int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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struct jffs2_raw_inode *ri, unsigned char *buf,
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uint32_t offset, uint32_t writelen, uint32_t *retlen);
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int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f,
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struct jffs2_raw_inode *ri, const struct qstr *qstr);
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int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, const char *name,
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int namelen, struct jffs2_inode_info *dead_f, uint32_t time);
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int jffs2_do_link(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino,
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uint8_t type, const char *name, int namelen, uint32_t time);
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/* readinode.c */
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int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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uint32_t ino, struct jffs2_raw_inode *latest_node);
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int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic);
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void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f);
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/* malloc.c */
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int jffs2_create_slab_caches(void);
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void jffs2_destroy_slab_caches(void);
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struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize);
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void jffs2_free_full_dirent(struct jffs2_full_dirent *);
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struct jffs2_full_dnode *jffs2_alloc_full_dnode(void);
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void jffs2_free_full_dnode(struct jffs2_full_dnode *);
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struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void);
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void jffs2_free_raw_dirent(struct jffs2_raw_dirent *);
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struct jffs2_raw_inode *jffs2_alloc_raw_inode(void);
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void jffs2_free_raw_inode(struct jffs2_raw_inode *);
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struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void);
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void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *);
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int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c,
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struct jffs2_eraseblock *jeb, int nr);
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void jffs2_free_refblock(struct jffs2_raw_node_ref *);
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struct jffs2_node_frag *jffs2_alloc_node_frag(void);
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void jffs2_free_node_frag(struct jffs2_node_frag *);
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struct jffs2_inode_cache *jffs2_alloc_inode_cache(void);
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void jffs2_free_inode_cache(struct jffs2_inode_cache *);
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#ifdef CONFIG_JFFS2_FS_XATTR
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struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void);
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void jffs2_free_xattr_datum(struct jffs2_xattr_datum *);
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struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void);
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void jffs2_free_xattr_ref(struct jffs2_xattr_ref *);
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#endif
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/* gc.c */
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int jffs2_garbage_collect_pass(struct jffs2_sb_info *c);
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/* read.c */
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int jffs2_read_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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struct jffs2_full_dnode *fd, unsigned char *buf,
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int ofs, int len);
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int jffs2_read_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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unsigned char *buf, uint32_t offset, uint32_t len);
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char *jffs2_getlink(struct jffs2_sb_info *c, struct jffs2_inode_info *f);
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/* scan.c */
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int jffs2_scan_medium(struct jffs2_sb_info *c);
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void jffs2_rotate_lists(struct jffs2_sb_info *c);
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struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino);
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int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
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int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t size);
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/* build.c */
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int jffs2_do_mount_fs(struct jffs2_sb_info *c);
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/* erase.c */
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int jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count);
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void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
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#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
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/* wbuf.c */
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int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino);
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int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c);
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int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
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int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
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#endif
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#include "debug.h"
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#endif /* __JFFS2_NODELIST_H__ */
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