[672038b] | 1 | /* |
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| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
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| 3 | * |
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[3c96bee] | 4 | * Copyright © 2001-2003 Free Software Foundation, Inc. |
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| 5 | * Copyright © 2001-2007 Red Hat, Inc. |
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| 6 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
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| 7 | * Copyright © 2013 embedded brains GmbH <rtems@embedded-brains.de> |
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[672038b] | 8 | * |
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| 9 | * Created by Dominic Ostrowski <dominic.ostrowski@3glab.com> |
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| 10 | * Contributors: David Woodhouse, Nick Garnett, Richard Panton. |
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| 11 | * |
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[3c96bee] | 12 | * Port to the RTEMS by embedded brains GmbH. |
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| 13 | * |
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[672038b] | 14 | * For licensing information, see the file 'LICENCE' in this directory. |
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| 15 | * |
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| 16 | * $Id: fs-ecos.c,v 1.44 2005/07/24 15:29:57 dedekind Exp $ |
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| 17 | * |
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| 18 | */ |
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| 19 | |
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| 20 | #include <linux/kernel.h> |
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| 21 | #include "nodelist.h" |
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| 22 | #include <linux/pagemap.h> |
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| 23 | #include <linux/crc32.h> |
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| 24 | #include "compr.h" |
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| 25 | #include <errno.h> |
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| 26 | #include <string.h> |
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[3c96bee] | 27 | #include <assert.h> |
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| 28 | #include <rtems/libio_.h> |
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| 29 | |
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| 30 | /* Ensure that the JFFS2 values are identical to the POSIX defines */ |
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| 31 | |
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| 32 | RTEMS_STATIC_ASSERT(DT_DIR == (S_IFDIR >> 12), DT_DIR); |
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| 33 | RTEMS_STATIC_ASSERT(DT_LNK == (S_IFLNK >> 12), DT_LNK); |
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| 34 | RTEMS_STATIC_ASSERT(DT_REG == (S_IFREG >> 12), DT_REG); |
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| 35 | |
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| 36 | RTEMS_STATIC_ASSERT(00400 == S_IRUSR, S_IRUSR); |
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| 37 | RTEMS_STATIC_ASSERT(00200 == S_IWUSR, S_IWUSR); |
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| 38 | RTEMS_STATIC_ASSERT(00100 == S_IXUSR, S_IXUSR); |
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| 39 | RTEMS_STATIC_ASSERT(00040 == S_IRGRP, S_IRGRP); |
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| 40 | RTEMS_STATIC_ASSERT(00020 == S_IWGRP, S_IWGRP); |
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| 41 | RTEMS_STATIC_ASSERT(00010 == S_IXGRP, S_IXGRP); |
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| 42 | RTEMS_STATIC_ASSERT(00004 == S_IROTH, S_IROTH); |
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| 43 | RTEMS_STATIC_ASSERT(00002 == S_IWOTH, S_IWOTH); |
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| 44 | RTEMS_STATIC_ASSERT(00001 == S_IXOTH, S_IXOTH); |
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| 45 | |
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| 46 | RTEMS_STATIC_ASSERT(0140000 == S_IFSOCK, S_IFSOCK); |
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| 47 | RTEMS_STATIC_ASSERT(0120000 == S_IFLNK, S_IFLNK); |
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| 48 | RTEMS_STATIC_ASSERT(0100000 == S_IFREG, S_IFREG); |
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| 49 | RTEMS_STATIC_ASSERT(0060000 == S_IFBLK, S_IFBLK); |
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| 50 | RTEMS_STATIC_ASSERT(0040000 == S_IFDIR, S_IFDIR); |
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| 51 | RTEMS_STATIC_ASSERT(0020000 == S_IFCHR, S_IFCHR); |
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| 52 | RTEMS_STATIC_ASSERT(0010000 == S_IFIFO, S_IFIFO); |
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| 53 | RTEMS_STATIC_ASSERT(0004000 == S_ISUID, S_ISUID); |
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| 54 | RTEMS_STATIC_ASSERT(0002000 == S_ISGID, S_ISGID); |
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| 55 | RTEMS_STATIC_ASSERT(0001000 == S_ISVTX, S_ISVTX); |
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[672038b] | 56 | |
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| 57 | static int jffs2_read_inode (struct _inode *inode); |
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| 58 | static void jffs2_clear_inode (struct _inode *inode); |
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| 59 | |
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| 60 | //========================================================================== |
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| 61 | // Ref count and nlink management |
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| 62 | |
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| 63 | |
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| 64 | // FIXME: This seems like real cruft. Wouldn't it be better just to do the |
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| 65 | // right thing? |
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| 66 | static void icache_evict(struct _inode *root_i, struct _inode *i) |
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| 67 | { |
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| 68 | struct _inode *this = root_i, *next; |
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| 69 | |
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| 70 | restart: |
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| 71 | D2(printf("icache_evict\n")); |
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| 72 | // If this is an absolute search path from the root, |
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| 73 | // remove all cached inodes with i_count of zero (these are only |
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| 74 | // held where needed for dotdot filepaths) |
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| 75 | while (this) { |
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| 76 | next = this->i_cache_next; |
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| 77 | if (this != i && this->i_count == 0) { |
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| 78 | struct _inode *parent = this->i_parent; |
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| 79 | if (this->i_cache_next) |
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| 80 | this->i_cache_next->i_cache_prev = this->i_cache_prev; |
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| 81 | if (this->i_cache_prev) |
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| 82 | this->i_cache_prev->i_cache_next = this->i_cache_next; |
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| 83 | jffs2_clear_inode(this); |
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| 84 | memset(this, 0x5a, sizeof(*this)); |
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| 85 | free(this); |
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| 86 | if (parent && parent != this) { |
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| 87 | parent->i_count--; |
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| 88 | this = root_i; |
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| 89 | goto restart; |
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| 90 | } |
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| 91 | } |
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| 92 | this = next; |
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| 93 | } |
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| 94 | } |
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| 95 | |
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| 96 | // ------------------------------------------------------------------------- |
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[3c96bee] | 97 | // jffs2_fo_write() |
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| 98 | // Write data to file. |
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| 99 | static int jffs2_extend_file (struct _inode *inode, struct jffs2_raw_inode *ri, |
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| 100 | unsigned long offset) |
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[672038b] | 101 | { |
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[3c96bee] | 102 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
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| 103 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
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| 104 | struct jffs2_full_dnode *fn; |
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| 105 | uint32_t alloc_len; |
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| 106 | int ret = 0; |
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[672038b] | 107 | |
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[3c96bee] | 108 | /* Make new hole frag from old EOF to new page */ |
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| 109 | D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n", |
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| 110 | (unsigned int)inode->i_size, offset)); |
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[672038b] | 111 | |
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[3c96bee] | 112 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloc_len, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
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| 113 | if (ret) |
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| 114 | return ret; |
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[672038b] | 115 | |
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[3c96bee] | 116 | mutex_lock(&f->sem); |
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[672038b] | 117 | |
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[3c96bee] | 118 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
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| 119 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); |
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| 120 | ri->totlen = cpu_to_je32(sizeof(*ri)); |
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| 121 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
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[672038b] | 122 | |
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[3c96bee] | 123 | ri->version = cpu_to_je32(++f->highest_version); |
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| 124 | ri->isize = cpu_to_je32(max((uint32_t)inode->i_size, offset)); |
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[672038b] | 125 | |
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[3c96bee] | 126 | ri->offset = cpu_to_je32(inode->i_size); |
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| 127 | ri->dsize = cpu_to_je32(offset - inode->i_size); |
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| 128 | ri->csize = cpu_to_je32(0); |
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| 129 | ri->compr = JFFS2_COMPR_ZERO; |
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| 130 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
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| 131 | ri->data_crc = cpu_to_je32(0); |
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| 132 | |
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| 133 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
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| 134 | jffs2_complete_reservation(c); |
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| 135 | if (IS_ERR(fn)) { |
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| 136 | ret = PTR_ERR(fn); |
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| 137 | mutex_unlock(&f->sem); |
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| 138 | return ret; |
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| 139 | } |
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| 140 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); |
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| 141 | if (f->metadata) { |
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| 142 | jffs2_mark_node_obsolete(c, f->metadata->raw); |
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| 143 | jffs2_free_full_dnode(f->metadata); |
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| 144 | f->metadata = NULL; |
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| 145 | } |
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| 146 | if (ret) { |
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| 147 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in prepare_write, returned %d\n", ret)); |
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| 148 | jffs2_mark_node_obsolete(c, fn->raw); |
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| 149 | jffs2_free_full_dnode(fn); |
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| 150 | mutex_unlock(&f->sem); |
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| 151 | return ret; |
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| 152 | } |
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| 153 | inode->i_size = offset; |
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| 154 | mutex_unlock(&f->sem); |
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| 155 | return 0; |
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| 156 | } |
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[672038b] | 157 | |
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[3c96bee] | 158 | static int jffs2_do_setattr (struct _inode *inode, struct iattr *iattr) |
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| 159 | { |
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| 160 | struct jffs2_full_dnode *old_metadata, *new_metadata; |
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| 161 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
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| 162 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
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| 163 | struct jffs2_raw_inode *ri; |
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| 164 | unsigned char *mdata = NULL; |
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| 165 | int mdatalen = 0; |
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| 166 | unsigned int ivalid; |
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| 167 | uint32_t alloclen; |
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| 168 | int ret; |
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| 169 | int alloc_type = ALLOC_NORMAL; |
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| 170 | |
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| 171 | jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino); |
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| 172 | |
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| 173 | /* Special cases - we don't want more than one data node |
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| 174 | for these types on the medium at any time. So setattr |
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| 175 | must read the original data associated with the node |
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| 176 | (i.e. the device numbers or the target name) and write |
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| 177 | it out again with the appropriate data attached */ |
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| 178 | if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { |
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| 179 | return -EIO; |
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| 180 | } else if (S_ISLNK(inode->i_mode)) { |
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| 181 | mutex_lock(&f->sem); |
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| 182 | mdatalen = f->metadata->size; |
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| 183 | mdata = kmalloc(f->metadata->size, GFP_USER); |
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| 184 | if (!mdata) { |
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| 185 | mutex_unlock(&f->sem); |
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| 186 | return -ENOMEM; |
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[672038b] | 187 | } |
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[3c96bee] | 188 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
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| 189 | if (ret) { |
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| 190 | mutex_unlock(&f->sem); |
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| 191 | kfree(mdata); |
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| 192 | return ret; |
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| 193 | } |
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| 194 | mutex_unlock(&f->sem); |
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| 195 | jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n", |
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| 196 | __func__, mdatalen); |
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| 197 | } |
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[672038b] | 198 | |
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[3c96bee] | 199 | ri = jffs2_alloc_raw_inode(); |
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| 200 | if (!ri) { |
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| 201 | if (S_ISLNK(inode->i_mode)) |
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| 202 | kfree(mdata); |
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| 203 | return -ENOMEM; |
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[672038b] | 204 | } |
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| 205 | |
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[3c96bee] | 206 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
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| 207 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
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| 208 | if (ret) { |
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| 209 | jffs2_free_raw_inode(ri); |
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| 210 | if (S_ISLNK(inode->i_mode)) |
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| 211 | kfree(mdata); |
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| 212 | return ret; |
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| 213 | } |
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| 214 | mutex_lock(&f->sem); |
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| 215 | ivalid = iattr->ia_valid; |
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[672038b] | 216 | |
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[3c96bee] | 217 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
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| 218 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); |
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| 219 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); |
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| 220 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
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[672038b] | 221 | |
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[3c96bee] | 222 | ri->ino = cpu_to_je32(inode->i_ino); |
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| 223 | ri->version = cpu_to_je32(++f->highest_version); |
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[672038b] | 224 | |
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[3c96bee] | 225 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)? |
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| 226 | from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode)); |
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| 227 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)? |
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| 228 | from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode)); |
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| 229 | |
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| 230 | if (ivalid & ATTR_MODE) |
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| 231 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
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| 232 | else |
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| 233 | ri->mode = cpu_to_jemode(inode->i_mode); |
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| 234 | |
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| 235 | |
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| 236 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); |
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| 237 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); |
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| 238 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); |
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| 239 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); |
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| 240 | |
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| 241 | ri->offset = cpu_to_je32(0); |
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| 242 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); |
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| 243 | ri->compr = JFFS2_COMPR_NONE; |
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| 244 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
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| 245 | /* It's an extension. Make it a hole node */ |
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| 246 | ri->compr = JFFS2_COMPR_ZERO; |
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| 247 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); |
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| 248 | ri->offset = cpu_to_je32(inode->i_size); |
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| 249 | } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { |
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| 250 | /* For truncate-to-zero, treat it as deletion because |
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| 251 | it'll always be obsoleting all previous nodes */ |
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| 252 | alloc_type = ALLOC_DELETION; |
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| 253 | } |
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| 254 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
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| 255 | if (mdatalen) |
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| 256 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); |
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| 257 | else |
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| 258 | ri->data_crc = cpu_to_je32(0); |
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| 259 | |
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| 260 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); |
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| 261 | if (S_ISLNK(inode->i_mode)) |
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| 262 | kfree(mdata); |
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| 263 | |
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| 264 | if (IS_ERR(new_metadata)) { |
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| 265 | jffs2_complete_reservation(c); |
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| 266 | jffs2_free_raw_inode(ri); |
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| 267 | mutex_unlock(&f->sem); |
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| 268 | return PTR_ERR(new_metadata); |
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| 269 | } |
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| 270 | /* It worked. Update the inode */ |
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| 271 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); |
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| 272 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); |
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| 273 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); |
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| 274 | inode->i_mode = jemode_to_cpu(ri->mode); |
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| 275 | i_uid_write(inode, je16_to_cpu(ri->uid)); |
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| 276 | i_gid_write(inode, je16_to_cpu(ri->gid)); |
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[672038b] | 277 | |
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| 278 | |
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[3c96bee] | 279 | old_metadata = f->metadata; |
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[672038b] | 280 | |
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[3c96bee] | 281 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) |
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| 282 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
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[672038b] | 283 | |
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[3c96bee] | 284 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
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| 285 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); |
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| 286 | inode->i_size = iattr->ia_size; |
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| 287 | f->metadata = NULL; |
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| 288 | } else { |
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| 289 | f->metadata = new_metadata; |
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| 290 | } |
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| 291 | if (old_metadata) { |
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| 292 | jffs2_mark_node_obsolete(c, old_metadata->raw); |
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| 293 | jffs2_free_full_dnode(old_metadata); |
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| 294 | } |
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| 295 | jffs2_free_raw_inode(ri); |
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[672038b] | 296 | |
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[3c96bee] | 297 | mutex_unlock(&f->sem); |
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| 298 | jffs2_complete_reservation(c); |
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[672038b] | 299 | |
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[3c96bee] | 300 | /* We have to do the truncate_setsize() without f->sem held, since |
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| 301 | some pages may be locked and waiting for it in readpage(). |
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| 302 | We are protected from a simultaneous write() extending i_size |
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| 303 | back past iattr->ia_size, because do_truncate() holds the |
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| 304 | generic inode semaphore. */ |
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| 305 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { |
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| 306 | truncate_setsize(inode, iattr->ia_size); |
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| 307 | } |
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[672038b] | 308 | |
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[3c96bee] | 309 | return 0; |
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[672038b] | 310 | } |
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| 311 | |
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[3c96bee] | 312 | typedef struct { |
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| 313 | struct super_block sb; |
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| 314 | struct jffs2_inode_cache *inode_cache[]; |
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| 315 | } rtems_jffs2_fs_info; |
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[672038b] | 316 | |
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[3c96bee] | 317 | static void rtems_jffs2_do_lock(const struct super_block *sb) |
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[672038b] | 318 | { |
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[3c96bee] | 319 | rtems_status_code sc = rtems_semaphore_obtain(sb->s_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 320 | assert(sc == RTEMS_SUCCESSFUL); |
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[672038b] | 321 | } |
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| 322 | |
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[3c96bee] | 323 | static void rtems_jffs2_do_unlock(const struct super_block *sb) |
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[672038b] | 324 | { |
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[3c96bee] | 325 | rtems_status_code sc = rtems_semaphore_release(sb->s_mutex); |
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| 326 | assert(sc == RTEMS_SUCCESSFUL); |
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| 327 | } |
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[672038b] | 328 | |
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[3c96bee] | 329 | static void rtems_jffs2_free_directory_entries(struct _inode *inode) |
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| 330 | { |
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| 331 | struct jffs2_full_dirent *current = inode->jffs2_i.dents; |
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[672038b] | 332 | |
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[3c96bee] | 333 | while (current != NULL) { |
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| 334 | struct jffs2_full_dirent *victim = current; |
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[672038b] | 335 | |
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[3c96bee] | 336 | current = victim->next; |
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| 337 | jffs2_free_full_dirent(victim); |
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[672038b] | 338 | } |
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[3c96bee] | 339 | } |
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[672038b] | 340 | |
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[3c96bee] | 341 | static void rtems_jffs2_flash_control_destroy(rtems_jffs2_flash_control *fc) |
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| 342 | { |
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| 343 | if (fc->destroy != NULL) { |
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| 344 | (*fc->destroy)(fc); |
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[672038b] | 345 | } |
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| 346 | } |
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[3c96bee] | 347 | static void rtems_jffs2_compressor_control_destroy(rtems_jffs2_compressor_control *cc) |
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[672038b] | 348 | { |
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[3c96bee] | 349 | if (cc != NULL && cc->destroy != NULL) { |
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| 350 | (*cc->destroy)(cc); |
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[672038b] | 351 | } |
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[3c96bee] | 352 | } |
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[672038b] | 353 | |
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| 354 | |
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[3c96bee] | 355 | static void rtems_jffs2_free_fs_info(rtems_jffs2_fs_info *fs_info, bool do_mount_fs_was_successful) |
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| 356 | { |
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| 357 | struct super_block *sb = &fs_info->sb; |
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| 358 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
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[672038b] | 359 | |
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[3c96bee] | 360 | if (do_mount_fs_was_successful) { |
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| 361 | jffs2_free_ino_caches(c); |
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| 362 | jffs2_free_raw_node_refs(c); |
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| 363 | free(c->blocks); |
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| 364 | } |
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[672038b] | 365 | |
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[3c96bee] | 366 | if (sb->s_mutex != 0) { |
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| 367 | rtems_status_code sc = rtems_semaphore_delete(sb->s_mutex); |
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| 368 | assert(sc == RTEMS_SUCCESSFUL); |
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[672038b] | 369 | } |
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| 370 | |
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[3c96bee] | 371 | rtems_jffs2_flash_control_destroy(fs_info->sb.s_flash_control); |
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| 372 | rtems_jffs2_compressor_control_destroy(fs_info->sb.s_compressor_control); |
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[672038b] | 373 | |
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[3c96bee] | 374 | free(fs_info); |
---|
[672038b] | 375 | } |
---|
| 376 | |
---|
[3c96bee] | 377 | static int rtems_jffs2_eno_to_rv_and_errno(int eno) |
---|
[672038b] | 378 | { |
---|
[3c96bee] | 379 | if (eno == 0) { |
---|
| 380 | return 0; |
---|
[672038b] | 381 | } else { |
---|
[3c96bee] | 382 | errno = eno; |
---|
| 383 | |
---|
| 384 | return -1; |
---|
[672038b] | 385 | } |
---|
| 386 | } |
---|
| 387 | |
---|
[3c96bee] | 388 | static struct _inode *rtems_jffs2_get_inode_by_location( |
---|
| 389 | const rtems_filesystem_location_info_t *loc |
---|
| 390 | ) |
---|
[672038b] | 391 | { |
---|
[3c96bee] | 392 | return loc->node_access; |
---|
| 393 | } |
---|
[672038b] | 394 | |
---|
[3c96bee] | 395 | static struct _inode *rtems_jffs2_get_inode_by_iop( |
---|
| 396 | const rtems_libio_t *iop |
---|
| 397 | ) |
---|
| 398 | { |
---|
| 399 | return iop->pathinfo.node_access; |
---|
| 400 | } |
---|
[672038b] | 401 | |
---|
[3c96bee] | 402 | static int rtems_jffs2_fstat( |
---|
| 403 | const rtems_filesystem_location_info_t *loc, |
---|
| 404 | struct stat *buf |
---|
| 405 | ) |
---|
| 406 | { |
---|
| 407 | struct _inode *inode = rtems_jffs2_get_inode_by_location(loc); |
---|
[672038b] | 408 | |
---|
[3c96bee] | 409 | rtems_jffs2_do_lock(inode->i_sb); |
---|
[672038b] | 410 | |
---|
[3c96bee] | 411 | buf->st_blksize = PAGE_SIZE; |
---|
| 412 | buf->st_mode = inode->i_mode; |
---|
| 413 | buf->st_ino = inode->i_ino; |
---|
| 414 | buf->st_nlink = inode->i_nlink; |
---|
| 415 | buf->st_uid = inode->i_uid; |
---|
| 416 | buf->st_gid = inode->i_gid; |
---|
| 417 | buf->st_size = inode->i_size; |
---|
| 418 | buf->st_atime = inode->i_atime; |
---|
| 419 | buf->st_mtime = inode->i_mtime; |
---|
| 420 | buf->st_ctime = inode->i_ctime; |
---|
[672038b] | 421 | |
---|
[3c96bee] | 422 | rtems_jffs2_do_unlock(inode->i_sb); |
---|
[672038b] | 423 | |
---|
[3c96bee] | 424 | return 0; |
---|
| 425 | } |
---|
[672038b] | 426 | |
---|
[3c96bee] | 427 | static int rtems_jffs2_fill_dirent(struct dirent *de, off_t off, uint32_t ino, const char *name) |
---|
| 428 | { |
---|
| 429 | int eno = 0; |
---|
| 430 | size_t len; |
---|
[672038b] | 431 | |
---|
[3c96bee] | 432 | memset(de, 0, sizeof(*de)); |
---|
[672038b] | 433 | |
---|
[3c96bee] | 434 | de->d_off = off * sizeof(*de); |
---|
| 435 | de->d_reclen = sizeof(*de); |
---|
| 436 | de->d_ino = ino; |
---|
[672038b] | 437 | |
---|
[3c96bee] | 438 | len = strlen(name); |
---|
| 439 | de->d_namlen = len; |
---|
[672038b] | 440 | |
---|
[3c96bee] | 441 | if (len < sizeof(de->d_name) - 1) { |
---|
| 442 | memcpy(&de->d_name[0], name, len); |
---|
| 443 | } else { |
---|
| 444 | eno = EOVERFLOW; |
---|
[672038b] | 445 | } |
---|
| 446 | |
---|
[3c96bee] | 447 | return eno; |
---|
[672038b] | 448 | } |
---|
| 449 | |
---|
[3c96bee] | 450 | static ssize_t rtems_jffs2_dir_read(rtems_libio_t *iop, void *buf, size_t len) |
---|
[672038b] | 451 | { |
---|
[3c96bee] | 452 | struct _inode *inode = rtems_jffs2_get_inode_by_iop(iop); |
---|
| 453 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
---|
| 454 | struct dirent *de = buf; |
---|
| 455 | off_t fd_off = 2; |
---|
| 456 | int eno = 0; |
---|
| 457 | struct jffs2_full_dirent *fd; |
---|
| 458 | off_t begin; |
---|
| 459 | off_t end; |
---|
| 460 | off_t off; |
---|
| 461 | |
---|
| 462 | rtems_jffs2_do_lock(inode->i_sb); |
---|
| 463 | |
---|
| 464 | fd = f->dents; |
---|
| 465 | begin = iop->offset; |
---|
| 466 | end = begin + len / sizeof(*de); |
---|
| 467 | off = begin; |
---|
| 468 | |
---|
| 469 | if (off == 0 && off < end) { |
---|
| 470 | eno = rtems_jffs2_fill_dirent(de, off, inode->i_ino, "."); |
---|
| 471 | assert(eno == 0); |
---|
| 472 | ++off; |
---|
| 473 | ++de; |
---|
[672038b] | 474 | } |
---|
| 475 | |
---|
[3c96bee] | 476 | if (off == 1 && off < end) { |
---|
| 477 | eno = rtems_jffs2_fill_dirent(de, off, inode->i_parent->i_ino, ".."); |
---|
| 478 | assert(eno == 0); |
---|
| 479 | ++off; |
---|
| 480 | ++de; |
---|
[672038b] | 481 | } |
---|
| 482 | |
---|
[3c96bee] | 483 | while (eno == 0 && off < end && fd != NULL) { |
---|
| 484 | if (fd->ino != 0) { |
---|
| 485 | if (off == fd_off) { |
---|
| 486 | eno = rtems_jffs2_fill_dirent(de, off, fd->ino, fd->name); |
---|
| 487 | ++off; |
---|
| 488 | ++de; |
---|
| 489 | } |
---|
[672038b] | 490 | |
---|
[3c96bee] | 491 | ++fd_off; |
---|
| 492 | } |
---|
[672038b] | 493 | |
---|
[3c96bee] | 494 | fd = fd->next; |
---|
| 495 | } |
---|
[672038b] | 496 | |
---|
[3c96bee] | 497 | rtems_jffs2_do_unlock(inode->i_sb); |
---|
[672038b] | 498 | |
---|
[3c96bee] | 499 | if (eno == 0) { |
---|
| 500 | iop->offset = off; |
---|
[672038b] | 501 | |
---|
[3c96bee] | 502 | return (off - begin) * sizeof(*de); |
---|
[672038b] | 503 | } else { |
---|
[3c96bee] | 504 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
[672038b] | 505 | } |
---|
| 506 | } |
---|
| 507 | |
---|
[3c96bee] | 508 | static const rtems_filesystem_file_handlers_r rtems_jffs2_directory_handlers = { |
---|
| 509 | .open_h = rtems_filesystem_default_open, |
---|
| 510 | .close_h = rtems_filesystem_default_close, |
---|
| 511 | .read_h = rtems_jffs2_dir_read, |
---|
| 512 | .write_h = rtems_filesystem_default_write, |
---|
| 513 | .ioctl_h = rtems_filesystem_default_ioctl, |
---|
| 514 | .lseek_h = rtems_filesystem_default_lseek_directory, |
---|
| 515 | .fstat_h = rtems_jffs2_fstat, |
---|
| 516 | .ftruncate_h = rtems_filesystem_default_ftruncate_directory, |
---|
| 517 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, |
---|
| 518 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, |
---|
| 519 | .fcntl_h = rtems_filesystem_default_fcntl |
---|
| 520 | }; |
---|
[672038b] | 521 | |
---|
[3c96bee] | 522 | static ssize_t rtems_jffs2_file_read(rtems_libio_t *iop, void *buf, size_t len) |
---|
[672038b] | 523 | { |
---|
[3c96bee] | 524 | struct _inode *inode = rtems_jffs2_get_inode_by_iop(iop); |
---|
| 525 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
---|
| 526 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
---|
| 527 | int err = 0; |
---|
| 528 | off_t pos; |
---|
[672038b] | 529 | |
---|
[3c96bee] | 530 | rtems_jffs2_do_lock(inode->i_sb); |
---|
[672038b] | 531 | |
---|
[3c96bee] | 532 | pos = iop->offset; |
---|
[672038b] | 533 | |
---|
[3c96bee] | 534 | if (pos >= inode->i_size) { |
---|
| 535 | len = 0; |
---|
| 536 | } else { |
---|
| 537 | uint32_t pos_32 = (uint32_t) pos; |
---|
| 538 | uint32_t max_available = inode->i_size - pos_32; |
---|
[672038b] | 539 | |
---|
[3c96bee] | 540 | if (len > max_available) { |
---|
| 541 | len = max_available; |
---|
| 542 | } |
---|
| 543 | |
---|
| 544 | err = jffs2_read_inode_range(c, f, buf, pos_32, len); |
---|
[672038b] | 545 | } |
---|
| 546 | |
---|
[3c96bee] | 547 | if (err == 0) { |
---|
| 548 | iop->offset += len; |
---|
[672038b] | 549 | } |
---|
| 550 | |
---|
[3c96bee] | 551 | rtems_jffs2_do_unlock(inode->i_sb); |
---|
[672038b] | 552 | |
---|
[3c96bee] | 553 | if (err == 0) { |
---|
| 554 | return (ssize_t) len; |
---|
| 555 | } else { |
---|
| 556 | errno = -err; |
---|
[672038b] | 557 | |
---|
[3c96bee] | 558 | return -1; |
---|
| 559 | } |
---|
| 560 | } |
---|
[672038b] | 561 | |
---|
[3c96bee] | 562 | static ssize_t rtems_jffs2_file_write(rtems_libio_t *iop, const void *buf, size_t len) |
---|
[672038b] | 563 | { |
---|
[3c96bee] | 564 | struct _inode *inode = rtems_jffs2_get_inode_by_iop(iop); |
---|
| 565 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
---|
| 566 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
---|
| 567 | struct jffs2_raw_inode ri; |
---|
| 568 | uint32_t writtenlen; |
---|
| 569 | off_t pos; |
---|
| 570 | int eno = 0; |
---|
[672038b] | 571 | |
---|
[3c96bee] | 572 | memset(&ri, 0, sizeof(ri)); |
---|
[672038b] | 573 | |
---|
[3c96bee] | 574 | ri.ino = cpu_to_je32(f->inocache->ino); |
---|
| 575 | ri.mode = cpu_to_jemode(inode->i_mode); |
---|
| 576 | ri.uid = cpu_to_je16(inode->i_uid); |
---|
| 577 | ri.gid = cpu_to_je16(inode->i_gid); |
---|
| 578 | ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds()); |
---|
[672038b] | 579 | |
---|
[3c96bee] | 580 | rtems_jffs2_do_lock(inode->i_sb); |
---|
[672038b] | 581 | |
---|
[3c96bee] | 582 | if ((iop->flags & LIBIO_FLAGS_APPEND) == 0) { |
---|
| 583 | pos = iop->offset; |
---|
| 584 | } else { |
---|
| 585 | pos = inode->i_size; |
---|
[672038b] | 586 | } |
---|
| 587 | |
---|
[3c96bee] | 588 | if (pos > inode->i_size) { |
---|
| 589 | ri.version = cpu_to_je32(++f->highest_version); |
---|
| 590 | eno = -jffs2_extend_file(inode, &ri, pos); |
---|
[672038b] | 591 | } |
---|
| 592 | |
---|
[3c96bee] | 593 | if (eno == 0) { |
---|
| 594 | ri.isize = cpu_to_je32(inode->i_size); |
---|
[672038b] | 595 | |
---|
[3c96bee] | 596 | eno = -jffs2_write_inode_range(c, f, &ri, (void *) buf, pos, len, &writtenlen); |
---|
[672038b] | 597 | } |
---|
| 598 | |
---|
[3c96bee] | 599 | if (eno == 0) { |
---|
| 600 | pos += writtenlen; |
---|
[672038b] | 601 | |
---|
[3c96bee] | 602 | inode->i_mtime = inode->i_ctime = je32_to_cpu(ri.mtime); |
---|
[672038b] | 603 | |
---|
[3c96bee] | 604 | if (pos > inode->i_size) { |
---|
| 605 | inode->i_size = pos; |
---|
[672038b] | 606 | } |
---|
| 607 | |
---|
[3c96bee] | 608 | iop->offset = pos; |
---|
[672038b] | 609 | |
---|
[3c96bee] | 610 | if (writtenlen != len) { |
---|
| 611 | eno = ENOSPC; |
---|
| 612 | } |
---|
[672038b] | 613 | } |
---|
| 614 | |
---|
[3c96bee] | 615 | rtems_jffs2_do_unlock(inode->i_sb); |
---|
[672038b] | 616 | |
---|
[3c96bee] | 617 | if (eno == 0) { |
---|
| 618 | return writtenlen; |
---|
| 619 | } else { |
---|
| 620 | errno = eno; |
---|
[672038b] | 621 | |
---|
[3c96bee] | 622 | return -1; |
---|
[672038b] | 623 | } |
---|
[3c96bee] | 624 | } |
---|
[672038b] | 625 | |
---|
[3c96bee] | 626 | static int rtems_jffs2_file_ftruncate(rtems_libio_t *iop, off_t length) |
---|
| 627 | { |
---|
| 628 | struct _inode *inode = rtems_jffs2_get_inode_by_iop(iop); |
---|
| 629 | struct iattr iattr; |
---|
| 630 | int eno; |
---|
[672038b] | 631 | |
---|
[3c96bee] | 632 | iattr.ia_valid = ATTR_SIZE | ATTR_MTIME | ATTR_CTIME; |
---|
| 633 | iattr.ia_size = length; |
---|
| 634 | iattr.ia_mtime = get_seconds(); |
---|
| 635 | iattr.ia_ctime = iattr.ia_mtime; |
---|
[672038b] | 636 | |
---|
[3c96bee] | 637 | rtems_jffs2_do_lock(inode->i_sb); |
---|
[672038b] | 638 | |
---|
[3c96bee] | 639 | eno = -jffs2_do_setattr(inode, &iattr); |
---|
[672038b] | 640 | |
---|
[3c96bee] | 641 | rtems_jffs2_do_unlock(inode->i_sb); |
---|
[672038b] | 642 | |
---|
[3c96bee] | 643 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
| 644 | } |
---|
[672038b] | 645 | |
---|
[3c96bee] | 646 | static const rtems_filesystem_file_handlers_r rtems_jffs2_file_handlers = { |
---|
| 647 | .open_h = rtems_filesystem_default_open, |
---|
| 648 | .close_h = rtems_filesystem_default_close, |
---|
| 649 | .read_h = rtems_jffs2_file_read, |
---|
| 650 | .write_h = rtems_jffs2_file_write, |
---|
| 651 | .ioctl_h = rtems_filesystem_default_ioctl, |
---|
| 652 | .lseek_h = rtems_filesystem_default_lseek_file, |
---|
| 653 | .fstat_h = rtems_jffs2_fstat, |
---|
| 654 | .ftruncate_h = rtems_jffs2_file_ftruncate, |
---|
| 655 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, |
---|
| 656 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, |
---|
| 657 | .fcntl_h = rtems_filesystem_default_fcntl |
---|
| 658 | }; |
---|
[672038b] | 659 | |
---|
[3c96bee] | 660 | static const rtems_filesystem_file_handlers_r rtems_jffs2_link_handlers = { |
---|
| 661 | .open_h = rtems_filesystem_default_open, |
---|
| 662 | .close_h = rtems_filesystem_default_close, |
---|
| 663 | .read_h = rtems_filesystem_default_read, |
---|
| 664 | .write_h = rtems_filesystem_default_write, |
---|
| 665 | .ioctl_h = rtems_filesystem_default_ioctl, |
---|
| 666 | .lseek_h = rtems_filesystem_default_lseek, |
---|
| 667 | .fstat_h = rtems_jffs2_fstat, |
---|
| 668 | .ftruncate_h = rtems_filesystem_default_ftruncate, |
---|
| 669 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync, |
---|
| 670 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync, |
---|
| 671 | .fcntl_h = rtems_filesystem_default_fcntl |
---|
| 672 | }; |
---|
[672038b] | 673 | |
---|
[3c96bee] | 674 | static void rtems_jffs2_set_location(rtems_filesystem_location_info_t *loc, struct _inode *inode) |
---|
| 675 | { |
---|
| 676 | loc->node_access = inode; |
---|
[672038b] | 677 | |
---|
[3c96bee] | 678 | switch (inode->i_mode & S_IFMT) { |
---|
| 679 | case S_IFREG: |
---|
| 680 | loc->handlers = &rtems_jffs2_file_handlers; |
---|
| 681 | break; |
---|
| 682 | case S_IFDIR: |
---|
| 683 | loc->handlers = &rtems_jffs2_directory_handlers; |
---|
| 684 | break; |
---|
| 685 | case S_IFLNK: |
---|
| 686 | loc->handlers = &rtems_jffs2_link_handlers; |
---|
| 687 | break; |
---|
| 688 | default: |
---|
| 689 | loc->handlers = &rtems_filesystem_null_handlers; |
---|
| 690 | break; |
---|
| 691 | }; |
---|
[672038b] | 692 | } |
---|
| 693 | |
---|
[3c96bee] | 694 | static bool rtems_jffs2_eval_is_directory( |
---|
| 695 | rtems_filesystem_eval_path_context_t *ctx, |
---|
| 696 | void *arg |
---|
| 697 | ) |
---|
[672038b] | 698 | { |
---|
[3c96bee] | 699 | rtems_filesystem_location_info_t *currentloc = |
---|
| 700 | rtems_filesystem_eval_path_get_currentloc(ctx); |
---|
| 701 | struct _inode *inode = rtems_jffs2_get_inode_by_location(currentloc); |
---|
[672038b] | 702 | |
---|
[3c96bee] | 703 | return S_ISDIR(inode->i_mode); |
---|
[672038b] | 704 | } |
---|
| 705 | |
---|
[3c96bee] | 706 | static rtems_filesystem_eval_path_generic_status rtems_jffs2_eval_token( |
---|
| 707 | rtems_filesystem_eval_path_context_t *ctx, |
---|
| 708 | void *arg, |
---|
| 709 | const char *token, |
---|
| 710 | size_t tokenlen |
---|
| 711 | ) |
---|
[672038b] | 712 | { |
---|
[3c96bee] | 713 | rtems_filesystem_eval_path_generic_status status = |
---|
| 714 | RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE; |
---|
| 715 | rtems_filesystem_location_info_t *currentloc = |
---|
| 716 | rtems_filesystem_eval_path_get_currentloc(ctx); |
---|
| 717 | struct _inode *dir_i = rtems_jffs2_get_inode_by_location(currentloc); |
---|
| 718 | bool access_ok = rtems_filesystem_eval_path_check_access( |
---|
| 719 | ctx, |
---|
| 720 | RTEMS_FS_PERMS_EXEC, |
---|
| 721 | dir_i->i_mode, |
---|
| 722 | dir_i->i_uid, |
---|
| 723 | dir_i->i_gid |
---|
| 724 | ); |
---|
| 725 | |
---|
| 726 | if (access_ok) { |
---|
| 727 | struct _inode *entry_i; |
---|
| 728 | |
---|
| 729 | if (rtems_filesystem_is_current_directory(token, tokenlen)) { |
---|
| 730 | entry_i = dir_i; |
---|
| 731 | ++entry_i->i_count; |
---|
| 732 | } else if (rtems_filesystem_is_parent_directory(token, tokenlen)) { |
---|
| 733 | entry_i = dir_i->i_parent; |
---|
| 734 | ++entry_i->i_count; |
---|
| 735 | } else { |
---|
| 736 | entry_i = jffs2_lookup(dir_i, token, (int) tokenlen); |
---|
| 737 | } |
---|
[672038b] | 738 | |
---|
[3c96bee] | 739 | if (IS_ERR(entry_i)) { |
---|
| 740 | rtems_filesystem_eval_path_error(ctx, PTR_ERR(entry_i)); |
---|
| 741 | } else if (entry_i != NULL) { |
---|
| 742 | bool terminal = !rtems_filesystem_eval_path_has_path(ctx); |
---|
| 743 | int eval_flags = rtems_filesystem_eval_path_get_flags(ctx); |
---|
| 744 | bool follow_sym_link = (eval_flags & RTEMS_FS_FOLLOW_SYM_LINK) != 0; |
---|
[672038b] | 745 | |
---|
[3c96bee] | 746 | rtems_filesystem_eval_path_clear_token(ctx); |
---|
[672038b] | 747 | |
---|
[3c96bee] | 748 | if (S_ISLNK(entry_i->i_mode) && (follow_sym_link || !terminal)) { |
---|
| 749 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(entry_i); |
---|
| 750 | const char *target = f->target; |
---|
[672038b] | 751 | |
---|
[3c96bee] | 752 | rtems_filesystem_eval_path_recursive(ctx, target, strlen(target)); |
---|
[672038b] | 753 | |
---|
[3c96bee] | 754 | jffs2_iput(entry_i); |
---|
| 755 | } else { |
---|
| 756 | if (S_ISDIR(entry_i->i_mode) && entry_i->i_parent == NULL) { |
---|
| 757 | entry_i->i_parent = dir_i; |
---|
| 758 | ++dir_i->i_count; |
---|
| 759 | } |
---|
[672038b] | 760 | |
---|
[3c96bee] | 761 | jffs2_iput(dir_i); |
---|
| 762 | rtems_jffs2_set_location(currentloc, entry_i); |
---|
[672038b] | 763 | |
---|
[3c96bee] | 764 | if (rtems_filesystem_eval_path_has_path(ctx)) { |
---|
| 765 | status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE; |
---|
| 766 | } |
---|
| 767 | } |
---|
| 768 | } else { |
---|
| 769 | status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_NO_ENTRY; |
---|
| 770 | } |
---|
[672038b] | 771 | } |
---|
| 772 | |
---|
[3c96bee] | 773 | return status; |
---|
[672038b] | 774 | } |
---|
| 775 | |
---|
[3c96bee] | 776 | static const rtems_filesystem_eval_path_generic_config rtems_jffs2_eval_config = { |
---|
| 777 | .is_directory = rtems_jffs2_eval_is_directory, |
---|
| 778 | .eval_token = rtems_jffs2_eval_token |
---|
| 779 | }; |
---|
[672038b] | 780 | |
---|
[3c96bee] | 781 | static void rtems_jffs2_lock(const rtems_filesystem_mount_table_entry_t *mt_entry) |
---|
[672038b] | 782 | { |
---|
[3c96bee] | 783 | const rtems_jffs2_fs_info *fs_info = mt_entry->fs_info; |
---|
| 784 | const struct super_block *sb = &fs_info->sb; |
---|
[672038b] | 785 | |
---|
[3c96bee] | 786 | rtems_jffs2_do_lock(sb); |
---|
| 787 | } |
---|
[672038b] | 788 | |
---|
[3c96bee] | 789 | static void rtems_jffs2_unlock(const rtems_filesystem_mount_table_entry_t *mt_entry) |
---|
| 790 | { |
---|
| 791 | const rtems_jffs2_fs_info *fs_info = mt_entry->fs_info; |
---|
| 792 | const struct super_block *sb = &fs_info->sb; |
---|
[672038b] | 793 | |
---|
[3c96bee] | 794 | rtems_jffs2_do_unlock(sb); |
---|
[672038b] | 795 | } |
---|
| 796 | |
---|
[3c96bee] | 797 | static void rtems_jffs2_eval_path(rtems_filesystem_eval_path_context_t *ctx) |
---|
| 798 | { |
---|
| 799 | rtems_filesystem_eval_path_generic(ctx, NULL, &rtems_jffs2_eval_config); |
---|
| 800 | } |
---|
[672038b] | 801 | |
---|
[3c96bee] | 802 | static int rtems_jffs2_link( |
---|
| 803 | const rtems_filesystem_location_info_t *parentloc, |
---|
| 804 | const rtems_filesystem_location_info_t *targetloc, |
---|
| 805 | const char *name, |
---|
| 806 | size_t namelen |
---|
| 807 | ) |
---|
[672038b] | 808 | { |
---|
[3c96bee] | 809 | struct _inode *old_d_inode = rtems_jffs2_get_inode_by_location(targetloc); |
---|
| 810 | struct _inode *dir_i = rtems_jffs2_get_inode_by_location(parentloc); |
---|
| 811 | int eno; |
---|
[672038b] | 812 | |
---|
[3c96bee] | 813 | eno = -jffs2_link(old_d_inode, dir_i, name, namelen); |
---|
[672038b] | 814 | |
---|
[3c96bee] | 815 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
| 816 | } |
---|
[672038b] | 817 | |
---|
[3c96bee] | 818 | static bool rtems_jffs2_are_nodes_equal( |
---|
| 819 | const rtems_filesystem_location_info_t *a, |
---|
| 820 | const rtems_filesystem_location_info_t *b |
---|
| 821 | ) |
---|
| 822 | { |
---|
| 823 | struct _inode *inode_a = rtems_jffs2_get_inode_by_location(a); |
---|
| 824 | struct _inode *inode_b = rtems_jffs2_get_inode_by_location(b); |
---|
[672038b] | 825 | |
---|
[3c96bee] | 826 | return inode_a->i_ino == inode_b->i_ino; |
---|
| 827 | } |
---|
[672038b] | 828 | |
---|
[3c96bee] | 829 | static rtems_filesystem_node_types_t rtems_jffs2_node_type( |
---|
| 830 | const rtems_filesystem_location_info_t *loc |
---|
| 831 | ) |
---|
| 832 | { |
---|
| 833 | struct _inode *inode = rtems_jffs2_get_inode_by_location(loc); |
---|
| 834 | rtems_filesystem_node_types_t type; |
---|
[672038b] | 835 | |
---|
[3c96bee] | 836 | switch (inode->i_mode & S_IFMT) { |
---|
| 837 | case S_IFDIR: |
---|
| 838 | type = RTEMS_FILESYSTEM_DIRECTORY; |
---|
| 839 | break; |
---|
| 840 | case S_IFREG: |
---|
| 841 | type = RTEMS_FILESYSTEM_MEMORY_FILE; |
---|
| 842 | break; |
---|
| 843 | case S_IFLNK: |
---|
| 844 | type = RTEMS_FILESYSTEM_SYM_LINK; |
---|
| 845 | break; |
---|
| 846 | default: |
---|
| 847 | type = RTEMS_FILESYSTEM_INVALID_NODE_TYPE; |
---|
| 848 | break; |
---|
[672038b] | 849 | } |
---|
| 850 | |
---|
[3c96bee] | 851 | return type; |
---|
[672038b] | 852 | } |
---|
| 853 | |
---|
[3c96bee] | 854 | static int rtems_jffs2_mknod( |
---|
| 855 | const rtems_filesystem_location_info_t *parentloc, |
---|
| 856 | const char *name, |
---|
| 857 | size_t namelen, |
---|
| 858 | mode_t mode, |
---|
| 859 | dev_t dev |
---|
| 860 | ) |
---|
[672038b] | 861 | { |
---|
[3c96bee] | 862 | struct _inode *dir_i = rtems_jffs2_get_inode_by_location(parentloc); |
---|
| 863 | int eno; |
---|
[672038b] | 864 | |
---|
[3c96bee] | 865 | switch (mode & S_IFMT) { |
---|
| 866 | case S_IFDIR: |
---|
| 867 | eno = -jffs2_mknod(dir_i, name, namelen, mode, NULL, 0); |
---|
| 868 | break; |
---|
| 869 | case S_IFREG: |
---|
| 870 | eno = -jffs2_create(dir_i, name, namelen, mode); |
---|
| 871 | break; |
---|
| 872 | default: |
---|
| 873 | eno = EINVAL; |
---|
| 874 | break; |
---|
| 875 | } |
---|
[672038b] | 876 | |
---|
[3c96bee] | 877 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
[672038b] | 878 | } |
---|
| 879 | |
---|
[3c96bee] | 880 | static int rtems_jffs2_cache_fd_name(struct _inode *inode, char **name, size_t *namelen) |
---|
[672038b] | 881 | { |
---|
[3c96bee] | 882 | struct super_block *sb = inode->i_sb; |
---|
| 883 | char *fd_name = inode->i_fd->name; |
---|
| 884 | size_t fd_namelen = strlen(fd_name); |
---|
| 885 | int eno = 0; |
---|
| 886 | |
---|
| 887 | if (fd_namelen <= sizeof(sb->s_name_buf)) { |
---|
| 888 | *namelen = fd_namelen; |
---|
| 889 | *name = memcpy(&sb->s_name_buf[0], fd_name, fd_namelen); |
---|
| 890 | } else { |
---|
| 891 | eno = ENOMEM; |
---|
| 892 | } |
---|
[672038b] | 893 | |
---|
[3c96bee] | 894 | return eno; |
---|
| 895 | } |
---|
[672038b] | 896 | |
---|
[3c96bee] | 897 | static int rtems_jffs2_rmnod( |
---|
| 898 | const rtems_filesystem_location_info_t *parentloc, |
---|
| 899 | const rtems_filesystem_location_info_t *loc |
---|
| 900 | ) |
---|
| 901 | { |
---|
| 902 | struct _inode *dir_i = rtems_jffs2_get_inode_by_location(parentloc); |
---|
| 903 | struct _inode *entry_i = rtems_jffs2_get_inode_by_location(loc); |
---|
| 904 | char *name; |
---|
| 905 | size_t namelen; |
---|
| 906 | int eno = rtems_jffs2_cache_fd_name(entry_i, &name, &namelen); |
---|
| 907 | |
---|
| 908 | if (eno == 0) { |
---|
| 909 | switch (dir_i->i_mode & S_IFMT) { |
---|
| 910 | case S_IFDIR: |
---|
| 911 | eno = -jffs2_rmdir(dir_i, entry_i, name, namelen); |
---|
| 912 | break; |
---|
| 913 | case S_IFREG: |
---|
| 914 | eno = -jffs2_unlink(dir_i, entry_i, name, namelen); |
---|
| 915 | break; |
---|
| 916 | default: |
---|
| 917 | eno = EINVAL; |
---|
| 918 | break; |
---|
[672038b] | 919 | } |
---|
| 920 | } |
---|
| 921 | |
---|
[3c96bee] | 922 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
| 923 | } |
---|
[672038b] | 924 | |
---|
[3c96bee] | 925 | static int rtems_jffs2_fchmod( |
---|
| 926 | const rtems_filesystem_location_info_t *loc, |
---|
| 927 | mode_t mode |
---|
| 928 | ) |
---|
| 929 | { |
---|
| 930 | struct _inode *inode = rtems_jffs2_get_inode_by_location(loc); |
---|
| 931 | struct iattr iattr; |
---|
| 932 | int eno; |
---|
[672038b] | 933 | |
---|
[3c96bee] | 934 | iattr.ia_valid = ATTR_MODE | ATTR_CTIME; |
---|
| 935 | iattr.ia_mode = mode; |
---|
| 936 | iattr.ia_ctime = get_seconds(); |
---|
[672038b] | 937 | |
---|
[3c96bee] | 938 | eno = -jffs2_do_setattr(inode, &iattr); |
---|
[672038b] | 939 | |
---|
[3c96bee] | 940 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
[672038b] | 941 | } |
---|
| 942 | |
---|
[3c96bee] | 943 | static int rtems_jffs2_chown( |
---|
| 944 | const rtems_filesystem_location_info_t *loc, |
---|
| 945 | uid_t owner, |
---|
| 946 | gid_t group |
---|
| 947 | ) |
---|
[672038b] | 948 | { |
---|
[3c96bee] | 949 | struct _inode *inode = rtems_jffs2_get_inode_by_location(loc); |
---|
| 950 | struct iattr iattr; |
---|
| 951 | int eno; |
---|
[672038b] | 952 | |
---|
[3c96bee] | 953 | iattr.ia_valid = ATTR_UID | ATTR_GID | ATTR_CTIME; |
---|
| 954 | iattr.ia_uid = owner; |
---|
| 955 | iattr.ia_gid = group; |
---|
| 956 | iattr.ia_ctime = get_seconds(); |
---|
[672038b] | 957 | |
---|
[3c96bee] | 958 | eno = -jffs2_do_setattr(inode, &iattr); |
---|
[672038b] | 959 | |
---|
[3c96bee] | 960 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
| 961 | } |
---|
[672038b] | 962 | |
---|
[3c96bee] | 963 | static int rtems_jffs2_clonenode(rtems_filesystem_location_info_t *loc) |
---|
| 964 | { |
---|
| 965 | struct _inode *inode = rtems_jffs2_get_inode_by_location(loc); |
---|
[672038b] | 966 | |
---|
[3c96bee] | 967 | ++inode->i_count; |
---|
[672038b] | 968 | |
---|
| 969 | return 0; |
---|
| 970 | } |
---|
| 971 | |
---|
[3c96bee] | 972 | static void rtems_jffs2_freenode(const rtems_filesystem_location_info_t *loc) |
---|
[672038b] | 973 | { |
---|
[3c96bee] | 974 | struct _inode *inode = rtems_jffs2_get_inode_by_location(loc); |
---|
| 975 | |
---|
| 976 | jffs2_iput(inode); |
---|
[672038b] | 977 | } |
---|
| 978 | |
---|
[3c96bee] | 979 | static void rtems_jffs2_fsunmount(rtems_filesystem_mount_table_entry_t *mt_entry) |
---|
[672038b] | 980 | { |
---|
[3c96bee] | 981 | rtems_jffs2_fs_info *fs_info = mt_entry->fs_info; |
---|
| 982 | struct _inode *root_i = mt_entry->mt_fs_root->location.node_access; |
---|
[672038b] | 983 | |
---|
[3c96bee] | 984 | icache_evict(root_i, NULL); |
---|
| 985 | assert(root_i->i_cache_next == NULL); |
---|
| 986 | assert(root_i->i_count == 1); |
---|
| 987 | jffs2_iput(root_i); |
---|
[672038b] | 988 | |
---|
[3c96bee] | 989 | rtems_jffs2_free_directory_entries(root_i); |
---|
| 990 | free(root_i); |
---|
[672038b] | 991 | |
---|
[3c96bee] | 992 | rtems_jffs2_free_fs_info(fs_info, true); |
---|
| 993 | } |
---|
[672038b] | 994 | |
---|
[3c96bee] | 995 | static int rtems_jffs2_rename( |
---|
| 996 | const rtems_filesystem_location_info_t *oldparentloc, |
---|
| 997 | const rtems_filesystem_location_info_t *oldloc, |
---|
| 998 | const rtems_filesystem_location_info_t *newparentloc, |
---|
| 999 | const char *name, |
---|
| 1000 | size_t namelen |
---|
| 1001 | ) |
---|
| 1002 | { |
---|
| 1003 | struct _inode *old_dir_i = rtems_jffs2_get_inode_by_location(oldparentloc); |
---|
| 1004 | struct _inode *new_dir_i = rtems_jffs2_get_inode_by_location(newparentloc); |
---|
| 1005 | struct _inode *d_inode = rtems_jffs2_get_inode_by_location(oldloc); |
---|
| 1006 | char *oldname; |
---|
| 1007 | size_t oldnamelen; |
---|
| 1008 | int eno = rtems_jffs2_cache_fd_name(d_inode, &oldname, &oldnamelen); |
---|
| 1009 | |
---|
| 1010 | if (eno == 0) { |
---|
| 1011 | eno = -jffs2_rename(old_dir_i, d_inode, oldname, oldnamelen, new_dir_i, name, namelen); |
---|
[672038b] | 1012 | } |
---|
| 1013 | |
---|
[3c96bee] | 1014 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
[672038b] | 1015 | } |
---|
| 1016 | |
---|
[3c96bee] | 1017 | static int rtems_jffs2_statvfs( |
---|
| 1018 | const rtems_filesystem_location_info_t *loc, |
---|
| 1019 | struct statvfs *buf |
---|
| 1020 | ) |
---|
[672038b] | 1021 | { |
---|
[3c96bee] | 1022 | struct _inode *inode = rtems_jffs2_get_inode_by_location(loc); |
---|
| 1023 | struct super_block *sb = inode->i_sb; |
---|
| 1024 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
---|
| 1025 | unsigned long avail; |
---|
| 1026 | |
---|
| 1027 | spin_lock(&c->erase_completion_lock); |
---|
| 1028 | avail = c->dirty_size + c->free_size; |
---|
| 1029 | if (avail > c->sector_size * c->resv_blocks_write) { |
---|
| 1030 | avail -= c->sector_size * c->resv_blocks_write; |
---|
| 1031 | } else { |
---|
| 1032 | avail = 0; |
---|
[672038b] | 1033 | } |
---|
[3c96bee] | 1034 | spin_unlock(&c->erase_completion_lock); |
---|
[672038b] | 1035 | |
---|
[3c96bee] | 1036 | buf->f_bavail = avail >> PAGE_SHIFT; |
---|
| 1037 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; |
---|
| 1038 | buf->f_bsize = 1UL << PAGE_SHIFT; |
---|
| 1039 | buf->f_fsid = JFFS2_SUPER_MAGIC; |
---|
| 1040 | buf->f_namemax = JFFS2_MAX_NAME_LEN; |
---|
[672038b] | 1041 | |
---|
[3c96bee] | 1042 | buf->f_bfree = buf->f_bavail; |
---|
| 1043 | buf->f_frsize = buf->f_bsize; |
---|
[672038b] | 1044 | |
---|
[3c96bee] | 1045 | return 0; |
---|
[672038b] | 1046 | } |
---|
| 1047 | |
---|
[3c96bee] | 1048 | static int rtems_jffs2_utime( |
---|
| 1049 | const rtems_filesystem_location_info_t *loc, |
---|
| 1050 | time_t actime, |
---|
| 1051 | time_t modtime |
---|
| 1052 | ) |
---|
[672038b] | 1053 | { |
---|
[3c96bee] | 1054 | struct _inode *inode = rtems_jffs2_get_inode_by_location(loc); |
---|
| 1055 | struct iattr iattr; |
---|
| 1056 | int eno; |
---|
[672038b] | 1057 | |
---|
[3c96bee] | 1058 | iattr.ia_valid = ATTR_ATIME | ATTR_MTIME | ATTR_CTIME; |
---|
| 1059 | iattr.ia_atime = actime; |
---|
| 1060 | iattr.ia_mtime = modtime; |
---|
| 1061 | iattr.ia_ctime = get_seconds(); |
---|
[672038b] | 1062 | |
---|
[3c96bee] | 1063 | eno = -jffs2_do_setattr(inode, &iattr); |
---|
[672038b] | 1064 | |
---|
[3c96bee] | 1065 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
| 1066 | } |
---|
[672038b] | 1067 | |
---|
[3c96bee] | 1068 | static int rtems_jffs2_symlink( |
---|
| 1069 | const rtems_filesystem_location_info_t *parentloc, |
---|
| 1070 | const char *name, |
---|
| 1071 | size_t namelen, |
---|
| 1072 | const char *target |
---|
| 1073 | ) |
---|
[672038b] | 1074 | { |
---|
[3c96bee] | 1075 | struct _inode *dir_i = rtems_jffs2_get_inode_by_location(parentloc); |
---|
| 1076 | int eno; |
---|
[672038b] | 1077 | |
---|
[3c96bee] | 1078 | eno = -jffs2_mknod(dir_i, name, namelen, S_IFLNK | S_IRWXUGO, target, strlen(target)); |
---|
[672038b] | 1079 | |
---|
[3c96bee] | 1080 | return rtems_jffs2_eno_to_rv_and_errno(eno); |
---|
[672038b] | 1081 | } |
---|
| 1082 | |
---|
[3c96bee] | 1083 | static ssize_t rtems_jffs2_readlink( |
---|
| 1084 | const rtems_filesystem_location_info_t *loc, |
---|
| 1085 | char *buf, |
---|
| 1086 | size_t bufsize |
---|
| 1087 | ) |
---|
[672038b] | 1088 | { |
---|
[3c96bee] | 1089 | struct _inode *inode = rtems_jffs2_get_inode_by_location(loc); |
---|
| 1090 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
---|
| 1091 | const char *target = f->target; |
---|
| 1092 | ssize_t i; |
---|
[672038b] | 1093 | |
---|
[3c96bee] | 1094 | for (i = 0; i < (ssize_t) bufsize && target[i] != '\0'; ++i) { |
---|
| 1095 | buf[i] = target[i]; |
---|
| 1096 | } |
---|
[672038b] | 1097 | |
---|
[3c96bee] | 1098 | return i; |
---|
[672038b] | 1099 | } |
---|
| 1100 | |
---|
[3c96bee] | 1101 | static const rtems_filesystem_operations_table rtems_jffs2_ops = { |
---|
| 1102 | .lock_h = rtems_jffs2_lock, |
---|
| 1103 | .unlock_h = rtems_jffs2_unlock, |
---|
| 1104 | .eval_path_h = rtems_jffs2_eval_path, |
---|
| 1105 | .link_h = rtems_jffs2_link, |
---|
| 1106 | .are_nodes_equal_h = rtems_jffs2_are_nodes_equal, |
---|
| 1107 | .node_type_h = rtems_jffs2_node_type, |
---|
| 1108 | .mknod_h = rtems_jffs2_mknod, |
---|
| 1109 | .rmnod_h = rtems_jffs2_rmnod, |
---|
| 1110 | .fchmod_h = rtems_jffs2_fchmod, |
---|
| 1111 | .chown_h = rtems_jffs2_chown, |
---|
| 1112 | .clonenod_h = rtems_jffs2_clonenode, |
---|
| 1113 | .freenod_h = rtems_jffs2_freenode, |
---|
| 1114 | .mount_h = rtems_filesystem_default_mount, |
---|
| 1115 | .fsmount_me_h = rtems_jffs2_initialize, |
---|
| 1116 | .unmount_h = rtems_filesystem_default_unmount, |
---|
| 1117 | .fsunmount_me_h = rtems_jffs2_fsunmount, |
---|
| 1118 | .utime_h = rtems_jffs2_utime, |
---|
| 1119 | .symlink_h = rtems_jffs2_symlink, |
---|
| 1120 | .readlink_h = rtems_jffs2_readlink, |
---|
| 1121 | .rename_h = rtems_jffs2_rename, |
---|
| 1122 | .statvfs_h = rtems_jffs2_statvfs |
---|
| 1123 | }; |
---|
[672038b] | 1124 | |
---|
[3c96bee] | 1125 | static int calculate_inocache_hashsize(uint32_t flash_size) |
---|
[672038b] | 1126 | { |
---|
[3c96bee] | 1127 | /* |
---|
| 1128 | * Pick a inocache hash size based on the size of the medium. |
---|
| 1129 | * Count how many megabytes we're dealing with, apply a hashsize twice |
---|
| 1130 | * that size, but rounding down to the usual big powers of 2. And keep |
---|
| 1131 | * to sensible bounds. |
---|
| 1132 | */ |
---|
| 1133 | |
---|
| 1134 | int size_mb = flash_size / 1024 / 1024; |
---|
| 1135 | int hashsize = (size_mb * 2) & ~0x3f; |
---|
| 1136 | |
---|
| 1137 | if (hashsize < INOCACHE_HASHSIZE_MIN) |
---|
| 1138 | return INOCACHE_HASHSIZE_MIN; |
---|
| 1139 | if (hashsize > INOCACHE_HASHSIZE_MAX) |
---|
| 1140 | return INOCACHE_HASHSIZE_MAX; |
---|
| 1141 | |
---|
| 1142 | return hashsize; |
---|
[672038b] | 1143 | } |
---|
| 1144 | |
---|
[3c96bee] | 1145 | int rtems_jffs2_initialize( |
---|
| 1146 | rtems_filesystem_mount_table_entry_t *mt_entry, |
---|
| 1147 | const void *data |
---|
| 1148 | ) |
---|
[672038b] | 1149 | { |
---|
[3c96bee] | 1150 | const rtems_jffs2_mount_data *jffs2_mount_data = data; |
---|
| 1151 | rtems_jffs2_flash_control *fc = jffs2_mount_data->flash_control; |
---|
| 1152 | int inocache_hashsize = calculate_inocache_hashsize(fc->flash_size); |
---|
| 1153 | rtems_jffs2_fs_info *fs_info = calloc( |
---|
| 1154 | 1, |
---|
| 1155 | sizeof(*fs_info) + (size_t) inocache_hashsize * sizeof(fs_info->inode_cache[0]) |
---|
| 1156 | ); |
---|
| 1157 | bool do_mount_fs_was_successful = false; |
---|
| 1158 | struct super_block *sb; |
---|
| 1159 | struct jffs2_sb_info *c; |
---|
[672038b] | 1160 | int err; |
---|
| 1161 | |
---|
[3c96bee] | 1162 | if (fs_info != NULL) { |
---|
| 1163 | err = 0; |
---|
| 1164 | } else { |
---|
| 1165 | err = -ENOMEM; |
---|
[672038b] | 1166 | } |
---|
| 1167 | |
---|
[3c96bee] | 1168 | sb = &fs_info->sb; |
---|
| 1169 | c = JFFS2_SB_INFO(sb); |
---|
[672038b] | 1170 | |
---|
[3c96bee] | 1171 | if (err == 0) { |
---|
| 1172 | uint32_t blocks = fc->flash_size / fc->block_size; |
---|
[672038b] | 1173 | |
---|
[3c96bee] | 1174 | if ((fc->block_size * blocks) != fc->flash_size) { |
---|
| 1175 | fc->flash_size = fc->block_size * blocks; |
---|
| 1176 | pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n", |
---|
| 1177 | fc->flash_size / 1024); |
---|
| 1178 | } |
---|
[672038b] | 1179 | |
---|
[3c96bee] | 1180 | if (fc->flash_size < 5*fc->block_size) { |
---|
| 1181 | pr_err("Too few erase blocks (%d)\n", |
---|
| 1182 | fc->flash_size / fc->block_size); |
---|
| 1183 | err = -EINVAL; |
---|
| 1184 | } |
---|
| 1185 | } |
---|
[672038b] | 1186 | |
---|
[3c96bee] | 1187 | if (err == 0) { |
---|
| 1188 | rtems_status_code sc = rtems_semaphore_create( |
---|
| 1189 | rtems_build_name('J', 'F', 'F', 'S'), |
---|
| 1190 | 1, |
---|
| 1191 | RTEMS_PRIORITY | RTEMS_INHERIT_PRIORITY | RTEMS_BINARY_SEMAPHORE, |
---|
| 1192 | 0, |
---|
| 1193 | &sb->s_mutex |
---|
| 1194 | ); |
---|
[672038b] | 1195 | |
---|
[3c96bee] | 1196 | err = sc == RTEMS_SUCCESSFUL ? 0 : -ENOMEM; |
---|
| 1197 | } |
---|
[672038b] | 1198 | |
---|
[3c96bee] | 1199 | if (err == 0) { |
---|
| 1200 | sb->s_is_readonly = !mt_entry->writeable; |
---|
| 1201 | sb->s_flash_control = fc; |
---|
| 1202 | sb->s_compressor_control = jffs2_mount_data->compressor_control; |
---|
[672038b] | 1203 | |
---|
[3c96bee] | 1204 | c->inocache_hashsize = inocache_hashsize; |
---|
| 1205 | c->inocache_list = &fs_info->inode_cache[0]; |
---|
| 1206 | c->sector_size = fc->block_size; |
---|
| 1207 | c->flash_size = fc->flash_size; |
---|
| 1208 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); |
---|
[672038b] | 1209 | |
---|
[3c96bee] | 1210 | err = jffs2_do_mount_fs(c); |
---|
[672038b] | 1211 | } |
---|
| 1212 | |
---|
[3c96bee] | 1213 | if (err == 0) { |
---|
| 1214 | do_mount_fs_was_successful = true; |
---|
| 1215 | |
---|
| 1216 | sb->s_root = jffs2_iget(sb, 1); |
---|
| 1217 | if (IS_ERR(sb->s_root)) { |
---|
| 1218 | err = PTR_ERR(sb->s_root); |
---|
[672038b] | 1219 | } |
---|
| 1220 | } |
---|
| 1221 | |
---|
[3c96bee] | 1222 | if (err == 0) { |
---|
| 1223 | sb->s_root->i_parent = sb->s_root; |
---|
[672038b] | 1224 | |
---|
[3c96bee] | 1225 | if (!jffs2_is_readonly(c)) { |
---|
| 1226 | jffs2_erase_pending_blocks(c, 0); |
---|
| 1227 | } |
---|
[672038b] | 1228 | |
---|
[3c96bee] | 1229 | mt_entry->fs_info = fs_info; |
---|
| 1230 | mt_entry->ops = &rtems_jffs2_ops; |
---|
| 1231 | mt_entry->mt_fs_root->location.node_access = sb->s_root; |
---|
| 1232 | mt_entry->mt_fs_root->location.handlers = &rtems_jffs2_directory_handlers; |
---|
[672038b] | 1233 | |
---|
[3c96bee] | 1234 | return 0; |
---|
| 1235 | } else { |
---|
| 1236 | if (fs_info != NULL) { |
---|
| 1237 | rtems_jffs2_free_fs_info(fs_info, do_mount_fs_was_successful); |
---|
| 1238 | } else { |
---|
| 1239 | rtems_jffs2_flash_control_destroy(fc); |
---|
| 1240 | rtems_jffs2_compressor_control_destroy(jffs2_mount_data->compressor_control); |
---|
| 1241 | } |
---|
[672038b] | 1242 | |
---|
[3c96bee] | 1243 | errno = -err; |
---|
[672038b] | 1244 | |
---|
[3c96bee] | 1245 | return -1; |
---|
| 1246 | } |
---|
[672038b] | 1247 | } |
---|
| 1248 | |
---|
| 1249 | //========================================================================== |
---|
| 1250 | // |
---|
| 1251 | // Called by JFFS2 |
---|
| 1252 | // =============== |
---|
| 1253 | // |
---|
| 1254 | // |
---|
| 1255 | //========================================================================== |
---|
| 1256 | |
---|
| 1257 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
---|
| 1258 | struct jffs2_inode_info *f, |
---|
| 1259 | unsigned long offset, |
---|
| 1260 | unsigned long *priv) |
---|
| 1261 | { |
---|
| 1262 | int ret; |
---|
[3c96bee] | 1263 | struct super_block *sb = OFNI_BS_2SFFJ(c); |
---|
| 1264 | unsigned char *gc_buffer = &sb->s_gc_buffer[0]; |
---|
[672038b] | 1265 | |
---|
| 1266 | ret = jffs2_read_inode_range(c, f, gc_buffer, |
---|
| 1267 | offset & ~(PAGE_CACHE_SIZE-1), PAGE_CACHE_SIZE); |
---|
| 1268 | if (ret) |
---|
| 1269 | return ERR_PTR(ret); |
---|
| 1270 | |
---|
| 1271 | return gc_buffer; |
---|
| 1272 | } |
---|
| 1273 | |
---|
| 1274 | void jffs2_gc_release_page(struct jffs2_sb_info *c, |
---|
| 1275 | unsigned char *ptr, |
---|
| 1276 | unsigned long *priv) |
---|
| 1277 | { |
---|
| 1278 | /* Do nothing */ |
---|
| 1279 | } |
---|
| 1280 | |
---|
| 1281 | static struct _inode *new_inode(struct super_block *sb) |
---|
| 1282 | { |
---|
| 1283 | |
---|
| 1284 | // Only called in write.c jffs2_new_inode |
---|
| 1285 | // Always adds itself to inode cache |
---|
| 1286 | |
---|
| 1287 | struct _inode *inode; |
---|
| 1288 | struct _inode *cached_inode; |
---|
| 1289 | |
---|
| 1290 | inode = malloc(sizeof (struct _inode)); |
---|
| 1291 | if (inode == NULL) |
---|
| 1292 | return 0; |
---|
| 1293 | |
---|
| 1294 | D2(printf |
---|
| 1295 | ("malloc new_inode %x ####################################\n", |
---|
| 1296 | inode)); |
---|
| 1297 | |
---|
| 1298 | memset(inode, 0, sizeof (struct _inode)); |
---|
| 1299 | inode->i_sb = sb; |
---|
| 1300 | inode->i_ino = 1; |
---|
| 1301 | inode->i_count = 1; |
---|
| 1302 | inode->i_nlink = 1; // Let JFFS2 manage the link count |
---|
| 1303 | inode->i_size = 0; |
---|
| 1304 | |
---|
| 1305 | inode->i_cache_next = NULL; // Newest inode, about to be cached |
---|
| 1306 | |
---|
| 1307 | // Add to the icache |
---|
| 1308 | for (cached_inode = sb->s_root; cached_inode != NULL; |
---|
| 1309 | cached_inode = cached_inode->i_cache_next) { |
---|
| 1310 | if (cached_inode->i_cache_next == NULL) { |
---|
| 1311 | cached_inode->i_cache_next = inode; // Current last in cache points to newcomer |
---|
| 1312 | inode->i_cache_prev = cached_inode; // Newcomer points back to last |
---|
| 1313 | break; |
---|
| 1314 | } |
---|
| 1315 | } |
---|
| 1316 | return inode; |
---|
| 1317 | } |
---|
| 1318 | |
---|
| 1319 | static struct _inode *ilookup(struct super_block *sb, cyg_uint32 ino) |
---|
| 1320 | { |
---|
| 1321 | struct _inode *inode = NULL; |
---|
| 1322 | |
---|
| 1323 | D2(printf("ilookup\n")); |
---|
| 1324 | // Check for this inode in the cache |
---|
| 1325 | for (inode = sb->s_root; inode != NULL; inode = inode->i_cache_next) { |
---|
| 1326 | if (inode->i_ino == ino) { |
---|
| 1327 | inode->i_count++; |
---|
| 1328 | break; |
---|
| 1329 | } |
---|
| 1330 | } |
---|
| 1331 | return inode; |
---|
| 1332 | } |
---|
| 1333 | |
---|
| 1334 | struct _inode *jffs2_iget(struct super_block *sb, cyg_uint32 ino) |
---|
| 1335 | { |
---|
| 1336 | // Called in super.c jffs2_read_super, dir.c jffs2_lookup, |
---|
| 1337 | // and gc.c jffs2_garbage_collect_pass |
---|
| 1338 | |
---|
| 1339 | // Must first check for cached inode |
---|
| 1340 | // If this fails let new_inode create one |
---|
| 1341 | |
---|
| 1342 | struct _inode *inode; |
---|
| 1343 | int err; |
---|
| 1344 | |
---|
| 1345 | D2(printf("jffs2_iget\n")); |
---|
| 1346 | |
---|
| 1347 | inode = ilookup(sb, ino); |
---|
| 1348 | if (inode) |
---|
| 1349 | return inode; |
---|
| 1350 | |
---|
| 1351 | // Not cached, so malloc it |
---|
| 1352 | inode = new_inode(sb); |
---|
| 1353 | if (inode == NULL) |
---|
| 1354 | return ERR_PTR(-ENOMEM); |
---|
| 1355 | |
---|
| 1356 | inode->i_ino = ino; |
---|
| 1357 | |
---|
| 1358 | err = jffs2_read_inode(inode); |
---|
| 1359 | if (err) { |
---|
[3c96bee] | 1360 | printk("jffs2_read_inode() failed\n"); |
---|
[672038b] | 1361 | inode->i_nlink = 0; // free _this_ bad inode right now |
---|
| 1362 | jffs2_iput(inode); |
---|
| 1363 | inode = NULL; |
---|
| 1364 | return ERR_PTR(err); |
---|
| 1365 | } |
---|
| 1366 | return inode; |
---|
| 1367 | } |
---|
| 1368 | |
---|
| 1369 | // ------------------------------------------------------------------------- |
---|
| 1370 | // Decrement the reference count on an inode. If this makes the ref count |
---|
| 1371 | // zero, then this inode can be freed. |
---|
| 1372 | |
---|
| 1373 | void jffs2_iput(struct _inode *i) |
---|
| 1374 | { |
---|
| 1375 | // Called in jffs2_find |
---|
| 1376 | // (and jffs2_open and jffs2_ops_mkdir?) |
---|
| 1377 | // super.c jffs2_read_super, |
---|
| 1378 | // and gc.c jffs2_garbage_collect_pass |
---|
| 1379 | recurse: |
---|
[3c96bee] | 1380 | assert(i != NULL); |
---|
[672038b] | 1381 | |
---|
| 1382 | i->i_count--; |
---|
| 1383 | |
---|
| 1384 | if (i->i_count < 0) |
---|
| 1385 | BUG(); |
---|
| 1386 | |
---|
| 1387 | if (i->i_count) |
---|
| 1388 | return; |
---|
| 1389 | |
---|
| 1390 | if (!i->i_nlink) { |
---|
| 1391 | struct _inode *parent; |
---|
| 1392 | |
---|
| 1393 | // Remove from the icache linked list and free immediately |
---|
| 1394 | if (i->i_cache_prev) |
---|
| 1395 | i->i_cache_prev->i_cache_next = i->i_cache_next; |
---|
| 1396 | if (i->i_cache_next) |
---|
| 1397 | i->i_cache_next->i_cache_prev = i->i_cache_prev; |
---|
| 1398 | |
---|
| 1399 | parent = i->i_parent; |
---|
| 1400 | jffs2_clear_inode(i); |
---|
| 1401 | memset(i, 0x5a, sizeof(*i)); |
---|
| 1402 | free(i); |
---|
| 1403 | |
---|
| 1404 | if (parent && parent != i) { |
---|
| 1405 | i = parent; |
---|
| 1406 | goto recurse; |
---|
| 1407 | } |
---|
| 1408 | |
---|
| 1409 | } else { |
---|
| 1410 | // Evict some _other_ inode with i_count zero, leaving |
---|
| 1411 | // this latest one in the cache for a while |
---|
| 1412 | icache_evict(i->i_sb->s_root, i); |
---|
| 1413 | } |
---|
| 1414 | } |
---|
| 1415 | |
---|
| 1416 | |
---|
| 1417 | // ------------------------------------------------------------------------- |
---|
| 1418 | // EOF jffs2.c |
---|
| 1419 | |
---|
| 1420 | |
---|
| 1421 | static inline void jffs2_init_inode_info(struct jffs2_inode_info *f) |
---|
| 1422 | { |
---|
| 1423 | memset(f, 0, sizeof(*f)); |
---|
| 1424 | } |
---|
| 1425 | |
---|
| 1426 | static void jffs2_clear_inode (struct _inode *inode) |
---|
| 1427 | { |
---|
| 1428 | /* We can forget about this inode for now - drop all |
---|
| 1429 | * the nodelists associated with it, etc. |
---|
| 1430 | */ |
---|
| 1431 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
---|
| 1432 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
---|
| 1433 | |
---|
| 1434 | D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); |
---|
| 1435 | |
---|
| 1436 | jffs2_do_clear_inode(c, f); |
---|
| 1437 | } |
---|
| 1438 | |
---|
| 1439 | |
---|
| 1440 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, |
---|
| 1441 | fill in the raw_inode while you're at it. */ |
---|
| 1442 | struct _inode *jffs2_new_inode (struct _inode *dir_i, int mode, struct jffs2_raw_inode *ri) |
---|
| 1443 | { |
---|
| 1444 | struct _inode *inode; |
---|
| 1445 | struct super_block *sb = dir_i->i_sb; |
---|
| 1446 | struct jffs2_sb_info *c; |
---|
| 1447 | struct jffs2_inode_info *f; |
---|
| 1448 | int ret; |
---|
| 1449 | |
---|
| 1450 | D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); |
---|
| 1451 | |
---|
| 1452 | c = JFFS2_SB_INFO(sb); |
---|
| 1453 | |
---|
| 1454 | inode = new_inode(sb); |
---|
| 1455 | |
---|
| 1456 | if (!inode) |
---|
| 1457 | return ERR_PTR(-ENOMEM); |
---|
| 1458 | |
---|
| 1459 | f = JFFS2_INODE_INFO(inode); |
---|
| 1460 | jffs2_init_inode_info(f); |
---|
| 1461 | |
---|
| 1462 | memset(ri, 0, sizeof(*ri)); |
---|
| 1463 | /* Set OS-specific defaults for new inodes */ |
---|
[3c96bee] | 1464 | ri->uid = cpu_to_je16(geteuid()); |
---|
| 1465 | ri->gid = cpu_to_je16(getegid()); |
---|
[672038b] | 1466 | ri->mode = cpu_to_jemode(mode); |
---|
| 1467 | ret = jffs2_do_new_inode (c, f, mode, ri); |
---|
| 1468 | if (ret) { |
---|
| 1469 | // forceful evict: f->sem is locked already, and the |
---|
| 1470 | // inode is bad. |
---|
| 1471 | if (inode->i_cache_prev) |
---|
| 1472 | inode->i_cache_prev->i_cache_next = inode->i_cache_next; |
---|
| 1473 | if (inode->i_cache_next) |
---|
| 1474 | inode->i_cache_next->i_cache_prev = inode->i_cache_prev; |
---|
[3c96bee] | 1475 | mutex_unlock(&(f->sem)); |
---|
[672038b] | 1476 | jffs2_clear_inode(inode); |
---|
| 1477 | memset(inode, 0x6a, sizeof(*inode)); |
---|
| 1478 | free(inode); |
---|
| 1479 | return ERR_PTR(ret); |
---|
| 1480 | } |
---|
| 1481 | inode->i_nlink = 1; |
---|
| 1482 | inode->i_ino = je32_to_cpu(ri->ino); |
---|
| 1483 | inode->i_mode = jemode_to_cpu(ri->mode); |
---|
| 1484 | inode->i_gid = je16_to_cpu(ri->gid); |
---|
| 1485 | inode->i_uid = je16_to_cpu(ri->uid); |
---|
[3c96bee] | 1486 | inode->i_atime = inode->i_ctime = inode->i_mtime = get_seconds(); |
---|
[672038b] | 1487 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(inode->i_mtime); |
---|
| 1488 | |
---|
| 1489 | inode->i_size = 0; |
---|
| 1490 | |
---|
| 1491 | return inode; |
---|
| 1492 | } |
---|
| 1493 | |
---|
| 1494 | |
---|
| 1495 | static int jffs2_read_inode (struct _inode *inode) |
---|
| 1496 | { |
---|
| 1497 | struct jffs2_inode_info *f; |
---|
| 1498 | struct jffs2_sb_info *c; |
---|
| 1499 | struct jffs2_raw_inode latest_node; |
---|
| 1500 | int ret; |
---|
| 1501 | |
---|
| 1502 | D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino)); |
---|
| 1503 | |
---|
| 1504 | f = JFFS2_INODE_INFO(inode); |
---|
| 1505 | c = JFFS2_SB_INFO(inode->i_sb); |
---|
| 1506 | |
---|
| 1507 | jffs2_init_inode_info(f); |
---|
| 1508 | |
---|
| 1509 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
---|
| 1510 | |
---|
| 1511 | if (ret) { |
---|
[3c96bee] | 1512 | mutex_unlock(&f->sem); |
---|
[672038b] | 1513 | return ret; |
---|
| 1514 | } |
---|
| 1515 | inode->i_mode = jemode_to_cpu(latest_node.mode); |
---|
| 1516 | inode->i_uid = je16_to_cpu(latest_node.uid); |
---|
| 1517 | inode->i_gid = je16_to_cpu(latest_node.gid); |
---|
| 1518 | inode->i_size = je32_to_cpu(latest_node.isize); |
---|
| 1519 | inode->i_atime = je32_to_cpu(latest_node.atime); |
---|
| 1520 | inode->i_mtime = je32_to_cpu(latest_node.mtime); |
---|
| 1521 | inode->i_ctime = je32_to_cpu(latest_node.ctime); |
---|
| 1522 | |
---|
[3c96bee] | 1523 | inode->i_nlink = f->inocache->pino_nlink; |
---|
| 1524 | mutex_unlock(&f->sem); |
---|
[672038b] | 1525 | |
---|
| 1526 | D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); |
---|
| 1527 | return 0; |
---|
| 1528 | } |
---|
| 1529 | |
---|
| 1530 | |
---|
| 1531 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, |
---|
| 1532 | struct jffs2_inode_info *f) |
---|
| 1533 | { |
---|
| 1534 | jffs2_iput(OFNI_EDONI_2SFFJ(f)); |
---|
| 1535 | } |
---|
| 1536 | |
---|
| 1537 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, |
---|
[3c96bee] | 1538 | int inum, int unlinked) |
---|
[672038b] | 1539 | { |
---|
| 1540 | struct _inode *inode; |
---|
| 1541 | struct jffs2_inode_cache *ic; |
---|
[3c96bee] | 1542 | |
---|
| 1543 | if (unlinked) { |
---|
[672038b] | 1544 | /* The inode has zero nlink but its nodes weren't yet marked |
---|
[3c96bee] | 1545 | obsolete. This has to be because we're still waiting for |
---|
| 1546 | the final (close() and) iput() to happen. |
---|
[672038b] | 1547 | |
---|
[3c96bee] | 1548 | There's a possibility that the final iput() could have |
---|
[672038b] | 1549 | happened while we were contemplating. In order to ensure |
---|
| 1550 | that we don't cause a new read_inode() (which would fail) |
---|
| 1551 | for the inode in question, we use ilookup() in this case |
---|
[3c96bee] | 1552 | instead of iget(). |
---|
[672038b] | 1553 | |
---|
[3c96bee] | 1554 | The nlink can't _become_ zero at this point because we're |
---|
[672038b] | 1555 | holding the alloc_sem, and jffs2_do_unlink() would also |
---|
| 1556 | need that while decrementing nlink on any inode. |
---|
| 1557 | */ |
---|
| 1558 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); |
---|
| 1559 | if (!inode) { |
---|
[3c96bee] | 1560 | jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n", |
---|
| 1561 | inum); |
---|
[672038b] | 1562 | |
---|
| 1563 | spin_lock(&c->inocache_lock); |
---|
| 1564 | ic = jffs2_get_ino_cache(c, inum); |
---|
| 1565 | if (!ic) { |
---|
[3c96bee] | 1566 | jffs2_dbg(1, "Inode cache for ino #%u is gone\n", |
---|
| 1567 | inum); |
---|
[672038b] | 1568 | spin_unlock(&c->inocache_lock); |
---|
| 1569 | return NULL; |
---|
| 1570 | } |
---|
| 1571 | if (ic->state != INO_STATE_CHECKEDABSENT) { |
---|
| 1572 | /* Wait for progress. Don't just loop */ |
---|
[3c96bee] | 1573 | jffs2_dbg(1, "Waiting for ino #%u in state %d\n", |
---|
| 1574 | ic->ino, ic->state); |
---|
[672038b] | 1575 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
---|
| 1576 | } else { |
---|
| 1577 | spin_unlock(&c->inocache_lock); |
---|
| 1578 | } |
---|
| 1579 | |
---|
| 1580 | return NULL; |
---|
| 1581 | } |
---|
| 1582 | } else { |
---|
| 1583 | /* Inode has links to it still; they're not going away because |
---|
| 1584 | jffs2_do_unlink() would need the alloc_sem and we have it. |
---|
[3c96bee] | 1585 | Just iget() it, and if read_inode() is necessary that's OK. |
---|
[672038b] | 1586 | */ |
---|
| 1587 | inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); |
---|
| 1588 | if (IS_ERR(inode)) |
---|
[3c96bee] | 1589 | return ERR_CAST(inode); |
---|
[672038b] | 1590 | } |
---|
| 1591 | |
---|
| 1592 | return JFFS2_INODE_INFO(inode); |
---|
| 1593 | } |
---|