[a9fa9b7] | 1 | /* |
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| 2 | * COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org> |
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| 3 | * |
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| 4 | * The license and distribution terms for this file may be |
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| 5 | * found in the file LICENSE in this distribution or at |
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| 6 | * http://www.rtems.com/license/LICENSE. |
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| 7 | * |
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| 8 | * $Id$ |
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| 9 | */ |
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| 10 | /** |
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| 11 | * @file |
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| 12 | * |
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| 13 | * @ingroup rtems-rfs |
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| 14 | * |
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| 15 | * RTEMS File Systems Buffer Routines. |
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| 16 | * |
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| 17 | */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | |
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| 21 | #include <rtems/rfs/rtems-rfs-buffer.h> |
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| 22 | #include <rtems/rfs/rtems-rfs-file-system.h> |
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| 23 | |
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| 24 | /** |
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| 25 | * Scan the chain for a buffer that matches the block number. |
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| 26 | * |
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| 27 | * @param chain The chain to scan. |
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| 28 | * @param count The number of items on the chain. |
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| 29 | * @param block The block number to find. |
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| 30 | * @return rtems_rfs_buffer* The buffer if found else NULL. |
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| 31 | */ |
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| 32 | static rtems_rfs_buffer* |
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| 33 | rtems_rfs_scan_chain (rtems_chain_control* chain, |
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| 34 | uint32_t* count, |
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| 35 | rtems_rfs_buffer_block block) |
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| 36 | { |
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| 37 | rtems_rfs_buffer* buffer; |
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| 38 | rtems_chain_node* node; |
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| 39 | |
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| 40 | node = rtems_chain_last (chain); |
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| 41 | |
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| 42 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_CHAINS)) |
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| 43 | printf ("rtems-rfs: buffer-scan: count=%lu, block=%lu: ", *count, block); |
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| 44 | |
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| 45 | while (!rtems_chain_is_head (chain, node)) |
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| 46 | { |
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| 47 | buffer = (rtems_rfs_buffer*) node; |
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| 48 | |
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| 49 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_CHAINS)) |
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| 50 | printf ("%lu ", (rtems_rfs_buffer_block) buffer->user); |
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| 51 | |
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| 52 | if (((rtems_rfs_buffer_block) buffer->user) == block) |
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| 53 | { |
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| 54 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_CHAINS)) |
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| 55 | printf (": found block=%lu\n", (rtems_rfs_buffer_block) buffer->user); |
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| 56 | |
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| 57 | (*count)--; |
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| 58 | rtems_chain_extract (node); |
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| 59 | rtems_chain_set_off_chain (node); |
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| 60 | return buffer; |
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| 61 | } |
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| 62 | node = rtems_chain_previous (node); |
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| 63 | } |
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| 64 | |
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| 65 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_CHAINS)) |
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| 66 | printf (": not found\n"); |
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| 67 | |
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| 68 | return NULL; |
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| 69 | } |
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| 70 | |
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| 71 | int |
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| 72 | rtems_rfs_buffer_handle_request (rtems_rfs_file_system* fs, |
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| 73 | rtems_rfs_buffer_handle* handle, |
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| 74 | rtems_rfs_buffer_block block, |
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| 75 | bool read) |
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| 76 | { |
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| 77 | int rc; |
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| 78 | |
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| 79 | /* |
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| 80 | * If the handle has a buffer release it. This allows a handle to be reused |
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| 81 | * without needing to close then open it again. |
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| 82 | */ |
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| 83 | if (rtems_rfs_buffer_handle_has_block (handle)) |
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| 84 | { |
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| 85 | /* |
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| 86 | * Treat block 0 as special to handle the loading of the super block. |
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| 87 | */ |
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| 88 | if (block && (rtems_rfs_buffer_bnum (handle) == block)) |
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| 89 | return 0; |
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| 90 | |
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| 91 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_HANDLE_REQUEST)) |
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| 92 | printf ("rtems-rfs: buffer-request: handle has buffer: %lu\n", |
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| 93 | rtems_rfs_buffer_bnum (handle)); |
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| 94 | |
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| 95 | rc = rtems_rfs_buffer_handle_release (fs, handle); |
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| 96 | if (rc > 0) |
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| 97 | return rc; |
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| 98 | handle->dirty = false; |
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| 99 | handle->bnum = 0; |
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| 100 | } |
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| 101 | |
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| 102 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_HANDLE_REQUEST)) |
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| 103 | printf ("rtems-rfs: buffer-request: block=%lu\n", block); |
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| 104 | |
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| 105 | /* |
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| 106 | * First check to see if the buffer has already been requested and is |
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| 107 | * currently attached to a handle. If it is share the access. A buffer could |
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| 108 | * be shared where different parts of the block have separate functions. An |
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| 109 | * example is an inode block and the file system needs to handle 2 inodes in |
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| 110 | * the same block at the same time. |
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| 111 | */ |
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| 112 | if (fs->buffers_count) |
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| 113 | { |
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| 114 | /* |
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| 115 | * Check the active buffer list for shared buffers. |
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| 116 | */ |
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| 117 | handle->buffer = rtems_rfs_scan_chain (&fs->buffers, |
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| 118 | &fs->buffers_count, |
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| 119 | block); |
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| 120 | if (rtems_rfs_buffer_handle_has_block (handle) && |
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| 121 | rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_HANDLE_REQUEST)) |
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| 122 | printf ("rtems-rfs: buffer-request: buffer shared: refs: %d\n", |
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| 123 | rtems_rfs_buffer_refs (handle) + 1); |
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| 124 | } |
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| 125 | |
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| 126 | /* |
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| 127 | * If the buffer has not been found check the local cache of released |
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| 128 | * buffers. There are release and released modified lists to preserve the |
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| 129 | * state. |
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| 130 | */ |
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| 131 | if (!rtems_rfs_fs_no_local_cache (fs) && |
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| 132 | !rtems_rfs_buffer_handle_has_block (handle)) |
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| 133 | { |
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| 134 | /* |
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| 135 | * Check the local cache of released buffers. |
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| 136 | */ |
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| 137 | if (fs->release_count) |
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| 138 | handle->buffer = rtems_rfs_scan_chain (&fs->release, |
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| 139 | &fs->release_count, |
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| 140 | block); |
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| 141 | |
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| 142 | if (!rtems_rfs_buffer_handle_has_block (handle) && |
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| 143 | fs->release_modified_count) |
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| 144 | { |
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| 145 | handle->buffer = rtems_rfs_scan_chain (&fs->release_modified, |
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| 146 | &fs->release_modified_count, |
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| 147 | block); |
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| 148 | /* |
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| 149 | * If we found a buffer retain the dirty buffer state. |
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| 150 | */ |
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| 151 | if (rtems_rfs_buffer_handle_has_block (handle)) |
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| 152 | rtems_rfs_buffer_mark_dirty (handle); |
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| 153 | } |
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| 154 | } |
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| 155 | |
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| 156 | /* |
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| 157 | * If not located we request the buffer from the I/O layer. |
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| 158 | */ |
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| 159 | if (!rtems_rfs_buffer_handle_has_block (handle)) |
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| 160 | { |
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| 161 | rc = rtems_rfs_buffer_io_request (fs, block, read, &handle->buffer); |
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| 162 | |
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| 163 | rtems_chain_set_off_chain (rtems_rfs_buffer_link(handle)); |
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| 164 | |
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| 165 | if (rc > 0) |
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| 166 | { |
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| 167 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_HANDLE_REQUEST)) |
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| 168 | printf ("rtems-rfs: buffer-request: block=%lu: bdbuf-%s: %d: %s\n", |
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| 169 | block, read ? "read" : "get", rc, strerror (rc)); |
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| 170 | return rc; |
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| 171 | } |
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| 172 | } |
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| 173 | |
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| 174 | /* |
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| 175 | * Increase the reference count of the buffer. |
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| 176 | */ |
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| 177 | rtems_rfs_buffer_refs_up (handle); |
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| 178 | rtems_chain_append (&fs->buffers, rtems_rfs_buffer_link (handle)); |
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| 179 | fs->buffers_count++; |
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| 180 | |
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| 181 | handle->buffer->user = (void*) block; |
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| 182 | handle->bnum = block; |
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| 183 | |
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| 184 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_HANDLE_REQUEST)) |
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| 185 | printf ("rtems-rfs: buffer-request: block=%lu bdbuf-%s=%lu refs=%d\n", |
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| 186 | block, read ? "read" : "get", handle->buffer->block, |
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| 187 | handle->buffer->references); |
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| 188 | |
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| 189 | return 0; |
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| 190 | } |
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| 191 | |
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| 192 | int |
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| 193 | rtems_rfs_buffer_handle_release (rtems_rfs_file_system* fs, |
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| 194 | rtems_rfs_buffer_handle* handle) |
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| 195 | { |
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| 196 | int rc = 0; |
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| 197 | |
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| 198 | if (rtems_rfs_buffer_handle_has_block (handle)) |
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| 199 | { |
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| 200 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_HANDLE_RELEASE)) |
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| 201 | printf ("rtems-rfs: buffer-release: block=%lu %s refs=%d %s\n", |
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| 202 | rtems_rfs_buffer_bnum (handle), |
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| 203 | rtems_rfs_buffer_dirty (handle) ? "(dirty)" : "", |
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| 204 | rtems_rfs_buffer_refs (handle), |
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| 205 | rtems_rfs_buffer_refs (handle) == 0 ? "BAD REF COUNT" : ""); |
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| 206 | |
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| 207 | if (rtems_rfs_buffer_refs (handle) > 0) |
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| 208 | rtems_rfs_buffer_refs_down (handle); |
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| 209 | |
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| 210 | if (rtems_rfs_buffer_refs (handle) == 0) |
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| 211 | { |
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| 212 | rtems_chain_extract (rtems_rfs_buffer_link (handle)); |
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| 213 | fs->buffers_count--; |
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| 214 | |
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| 215 | if (rtems_rfs_fs_no_local_cache (fs)) |
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| 216 | { |
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| 217 | handle->buffer->user = (void*) 0; |
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| 218 | rc = rtems_rfs_buffer_io_release (handle->buffer, |
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| 219 | rtems_rfs_buffer_dirty (handle)); |
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| 220 | } |
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| 221 | else |
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| 222 | { |
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| 223 | /* |
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| 224 | * If the total number of held buffers is higher than the configured |
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| 225 | * value remove a buffer from the queue with the most buffers and |
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| 226 | * release. The buffers are held on the queues with the newest at the |
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| 227 | * head. |
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| 228 | * |
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| 229 | * This code stops a large series of transactions causing all the |
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| 230 | * buffers in the cache being held in queues of this file system. |
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| 231 | */ |
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| 232 | if ((fs->release_count + |
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| 233 | fs->release_modified_count) >= fs->max_held_buffers) |
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| 234 | { |
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| 235 | rtems_rfs_buffer* buffer; |
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| 236 | bool modified; |
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| 237 | |
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| 238 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_HANDLE_RELEASE)) |
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| 239 | printf ("rtems-rfs: buffer-release: local cache overflow:" \ |
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| 240 | " %lu\n", fs->release_count + fs->release_modified_count); |
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| 241 | |
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| 242 | if (fs->release_count > fs->release_modified_count) |
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| 243 | { |
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| 244 | buffer = (rtems_rfs_buffer*) rtems_chain_get (&fs->release); |
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| 245 | fs->release_count--; |
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| 246 | modified = false; |
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| 247 | } |
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| 248 | else |
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| 249 | { |
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| 250 | buffer = |
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| 251 | (rtems_rfs_buffer*) rtems_chain_get (&fs->release_modified); |
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| 252 | fs->release_modified_count--; |
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| 253 | modified = true; |
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| 254 | } |
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| 255 | buffer->user = (void*) 0; |
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| 256 | rc = rtems_rfs_buffer_io_release (buffer, modified); |
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| 257 | } |
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| 258 | |
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| 259 | if (rtems_rfs_buffer_dirty (handle)) |
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| 260 | { |
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| 261 | rtems_chain_append (&fs->release_modified, |
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| 262 | rtems_rfs_buffer_link (handle)); |
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| 263 | fs->release_modified_count++; |
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| 264 | } |
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| 265 | else |
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| 266 | { |
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| 267 | rtems_chain_append (&fs->release, rtems_rfs_buffer_link (handle)); |
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| 268 | fs->release_count++; |
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| 269 | } |
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| 270 | } |
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| 271 | } |
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| 272 | handle->buffer = NULL; |
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| 273 | } |
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| 274 | |
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| 275 | return rc; |
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| 276 | } |
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| 277 | |
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| 278 | int |
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| 279 | rtems_rfs_buffer_open (const char* name, rtems_rfs_file_system* fs) |
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| 280 | { |
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| 281 | struct stat st; |
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| 282 | |
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| 283 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_SYNC)) |
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| 284 | printf ("rtems-rfs: buffer-open: opening: %s\n", name); |
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| 285 | |
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| 286 | if (stat (name, &st) < 0) |
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| 287 | { |
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| 288 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_OPEN)) |
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| 289 | printf ("rtems-rfs: buffer-open: stat '%s' failed: %s\n", |
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| 290 | name, strerror (errno)); |
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| 291 | return ENOENT; |
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| 292 | } |
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| 293 | |
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| 294 | #if RTEMS_RFS_USE_LIBBLOCK |
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| 295 | /* |
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| 296 | * Is the device a block device ? |
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| 297 | */ |
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[5268642] | 298 | if (!S_ISBLK (st.st_mode)) |
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[a9fa9b7] | 299 | { |
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| 300 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_OPEN)) |
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| 301 | printf ("rtems-rfs: buffer-open: '%s' is not a block device\n", name); |
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| 302 | return EIO; |
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| 303 | } |
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| 304 | |
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| 305 | /* |
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| 306 | * Check that device is registred as a block device and lock it. |
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| 307 | */ |
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| 308 | fs->disk = rtems_disk_obtain (st.st_rdev); |
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| 309 | if (!fs->disk) |
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| 310 | { |
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| 311 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_OPEN)) |
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| 312 | printf ("rtems-rfs: buffer-open: cannot obtain the disk\n"); |
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| 313 | return EIO; |
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| 314 | } |
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| 315 | #else |
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| 316 | fs->device = open (name, O_RDWR); |
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| 317 | if (fs->device < 0) |
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| 318 | { |
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| 319 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_OPEN)) |
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| 320 | printf ("rtems-rfs: buffer-open: cannot open file\n"); |
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| 321 | } |
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| 322 | fs->media_size = st.st_size; |
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| 323 | strcat (fs->name, name); |
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| 324 | #endif |
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| 325 | |
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| 326 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_SYNC)) |
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| 327 | printf ("rtems-rfs: buffer-open: blks=%ld, blk-size=%ld\n", |
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| 328 | rtems_rfs_fs_media_blocks (fs), |
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| 329 | rtems_rfs_fs_media_block_size (fs)); |
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| 330 | |
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| 331 | return 0; |
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| 332 | } |
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| 333 | |
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| 334 | int |
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| 335 | rtems_rfs_buffer_close (rtems_rfs_file_system* fs) |
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| 336 | { |
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| 337 | int rc = 0; |
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| 338 | |
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| 339 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_CLOSE)) |
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| 340 | printf ("rtems-rfs: buffer-close: closing\n"); |
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| 341 | |
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| 342 | /* |
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| 343 | * Change the block size to the media device size. It will release and sync |
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| 344 | * all buffers. |
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| 345 | */ |
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| 346 | rc = rtems_rfs_buffer_setblksize (fs, rtems_rfs_fs_media_block_size (fs)); |
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| 347 | |
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| 348 | if ((rc > 0) && rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_CLOSE)) |
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| 349 | printf ("rtems-rfs: buffer-close: set media block size failed: %d: %s\n", |
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| 350 | rc, strerror (rc)); |
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| 351 | |
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| 352 | #if RTEMS_RFS_USE_LIBBLOCK |
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| 353 | rtems_disk_release (fs->disk); |
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| 354 | #else |
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| 355 | if (close (fs->device) < 0) |
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| 356 | { |
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| 357 | rc = errno; |
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| 358 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_CLOSE)) |
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| 359 | printf ("rtems-rfs: buffer-close: file close failed: %d: %s\n", |
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| 360 | rc, strerror (rc)); |
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| 361 | } |
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| 362 | #endif |
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| 363 | |
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| 364 | return rc; |
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| 365 | } |
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| 366 | |
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| 367 | int |
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| 368 | rtems_rfs_buffer_sync (rtems_rfs_file_system* fs) |
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| 369 | { |
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| 370 | int result = 0; |
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| 371 | #if RTEMS_RFS_USE_LIBBLOCK |
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| 372 | rtems_status_code sc; |
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| 373 | #endif |
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| 374 | |
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| 375 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_SYNC)) |
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| 376 | printf ("rtems-rfs: buffer-sync: syncing\n"); |
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| 377 | |
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| 378 | /* |
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| 379 | * @todo Split in the separate files for each type. |
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| 380 | */ |
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| 381 | #if RTEMS_RFS_USE_LIBBLOCK |
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| 382 | sc = rtems_bdbuf_syncdev (rtems_rfs_fs_device (fs)); |
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| 383 | if (sc != RTEMS_SUCCESSFUL) |
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| 384 | { |
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| 385 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_SYNC)) |
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| 386 | printf ("rtems-rfs: buffer-sync: device sync failed: %s\n", |
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| 387 | rtems_status_text (sc)); |
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| 388 | result = EIO; |
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| 389 | } |
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| 390 | rtems_disk_release (fs->disk); |
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| 391 | #else |
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| 392 | if (fsync (fs->device) < 0) |
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| 393 | { |
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| 394 | result = errno; |
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| 395 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_CLOSE)) |
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| 396 | printf ("rtems-rfs: buffer-sync: file sync failed: %d: %s\n", |
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| 397 | result, strerror (result)); |
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| 398 | } |
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| 399 | #endif |
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| 400 | return result; |
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| 401 | } |
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| 402 | |
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| 403 | int |
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| 404 | rtems_rfs_buffer_setblksize (rtems_rfs_file_system* fs, size_t size) |
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| 405 | { |
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| 406 | int rc; |
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| 407 | |
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| 408 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_SETBLKSIZE)) |
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| 409 | printf ("rtems-rfs: buffer-setblksize: block size: %lu\n", size); |
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| 410 | |
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| 411 | rc = rtems_rfs_buffers_release (fs); |
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| 412 | if ((rc > 0) && rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_SETBLKSIZE)) |
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| 413 | printf ("rtems-rfs: buffer-setblksize: buffer release failed: %d: %s\n", |
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| 414 | rc, strerror (rc)); |
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| 415 | |
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| 416 | rc = rtems_rfs_buffer_sync (fs); |
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| 417 | if ((rc > 0) && rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_SETBLKSIZE)) |
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| 418 | printf ("rtems-rfs: buffer-setblksize: device sync failed: %d: %s\n", |
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| 419 | rc, strerror (rc)); |
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| 420 | |
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| 421 | #if RTEMS_RFS_USE_LIBBLOCK |
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| 422 | rc = fs->disk->ioctl (fs->disk, RTEMS_BLKIO_SETBLKSIZE, &size); |
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| 423 | if (rc < 0) |
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| 424 | rc = errno; |
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| 425 | #endif |
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| 426 | return rc; |
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| 427 | } |
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| 428 | |
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| 429 | static int |
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| 430 | rtems_rfs_release_chain (rtems_chain_control* chain, |
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| 431 | uint32_t* count, |
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| 432 | bool modified) |
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| 433 | { |
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| 434 | rtems_rfs_buffer* buffer; |
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| 435 | int rrc = 0; |
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| 436 | int rc; |
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| 437 | |
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| 438 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_CHAINS)) |
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| 439 | printf ("rtems-rfs: release-chain: count=%lu\n", *count); |
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| 440 | |
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| 441 | while (!rtems_chain_is_empty (chain)) |
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| 442 | { |
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| 443 | buffer = (rtems_rfs_buffer*) rtems_chain_get (chain); |
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| 444 | (*count)--; |
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| 445 | |
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| 446 | buffer->user = (void*) 0; |
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| 447 | |
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| 448 | rc = rtems_rfs_buffer_io_release (buffer, modified); |
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| 449 | if ((rc > 0) && (rrc == 0)) |
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| 450 | rrc = rc; |
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| 451 | } |
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| 452 | return rrc; |
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| 453 | } |
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| 454 | |
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| 455 | int |
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| 456 | rtems_rfs_buffers_release (rtems_rfs_file_system* fs) |
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| 457 | { |
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| 458 | int rrc = 0; |
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| 459 | int rc; |
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| 460 | |
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| 461 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_BUFFER_RELEASE)) |
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| 462 | printf ("rtems-rfs: buffers-release: active:%lu " \ |
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| 463 | "release:%lu release-modified:%lu\n", |
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| 464 | fs->buffers_count, fs->release_count, fs->release_modified_count); |
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| 465 | |
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| 466 | rc = rtems_rfs_release_chain (&fs->release, |
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| 467 | &fs->release_count, |
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| 468 | false); |
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| 469 | if ((rc > 0) && (rrc == 0)) |
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| 470 | rrc = rc; |
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| 471 | rc = rtems_rfs_release_chain (&fs->release_modified, |
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| 472 | &fs->release_modified_count, |
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| 473 | true); |
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| 474 | if ((rc > 0) && (rrc == 0)) |
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| 475 | rrc = rc; |
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| 476 | |
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| 477 | return rrc; |
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| 478 | } |
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