mirror of
https://github.com/haiwen/seafile-server.git
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d50359c908
* Add and del ccnet compilation dependency in seafile * Del import ccnet * Del extra ccnet compilation dependencies * Del support WIN32
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
#include "common.h"
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#define FUSE_USE_VERSION 26
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#include <fuse.h>
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#include <glib.h>
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#include <glib-object.h>
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#include <seaf-db.h>
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#include "log.h"
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#include "utils.h"
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#include "seaf-fuse.h"
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int read_file(SeafileSession *seaf,
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const char *store_id, int version,
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Seafile *file,
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char *buf, size_t size,
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off_t offset, struct fuse_file_info *info)
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{
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BlockHandle *handle = NULL;;
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BlockMetadata *bmd;
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char *blkid;
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char *ptr;
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off_t off = 0, nleft;
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int i, n, ret = -EIO;
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for (i = 0; i < file->n_blocks; i++) {
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blkid = file->blk_sha1s[i];
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bmd = seaf_block_manager_stat_block(seaf->block_mgr, store_id, version, blkid);
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if (!bmd)
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return -EIO;
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if (offset < off + bmd->size) {
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g_free (bmd);
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break;
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}
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off += bmd->size;
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g_free (bmd);
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}
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/* beyond the file size */
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if (i == file->n_blocks)
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return 0;
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nleft = size;
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ptr = buf;
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while (nleft > 0 && i < file->n_blocks) {
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blkid = file->blk_sha1s[i];
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handle = seaf_block_manager_open_block(seaf->block_mgr,
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store_id, version,
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blkid, BLOCK_READ);
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if (!handle) {
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seaf_warning ("Failed to open block %s:%s.\n", store_id, blkid);
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return -EIO;
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}
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/* trim the offset in a block */
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if (offset > off) {
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char *tmp = (char *)malloc(sizeof(char) * (offset - off));
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if (!tmp)
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return -ENOMEM;
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n = seaf_block_manager_read_block(seaf->block_mgr, handle,
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tmp, offset-off);
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if (n != offset - off) {
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seaf_warning ("Failed to read block %s:%s.\n", store_id, blkid);
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free (tmp);
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goto out;
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}
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off += n;
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free(tmp);
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}
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if ((n = seaf_block_manager_read_block(seaf->block_mgr,
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handle, ptr, nleft)) < 0) {
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seaf_warning ("Failed to read block %s:%s.\n", store_id, blkid);
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goto out;
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}
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nleft -= n;
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ptr += n;
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off += n;
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++i;
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/* At this point we should have read all the content of the block or
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* have read up to @size bytes. So it's safe to close the block.
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*/
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seaf_block_manager_close_block(seaf->block_mgr, handle);
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seaf_block_manager_block_handle_free (seaf->block_mgr, handle);
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}
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return size - nleft;
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out:
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if (handle) {
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seaf_block_manager_close_block(seaf->block_mgr, handle);
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seaf_block_manager_block_handle_free (seaf->block_mgr, handle);
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}
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return ret;
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}
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