52be5c0afb
- rename start_vtreefs to run_vtreefs, since the function returns upon termination these days; - add get_inode_slots function to retrieve the number of indexed slots; - add support for extra per-inode data for arbitrary storage. Change-Id: If2d365d7b478a1cecc9e20fb2b3e70c1a1cf7243
57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
/* VTreeFS - extra.c - per-inode storage of arbitrary extra data */
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#include "inc.h"
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/*
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* Right now, we maintain the extra data (if requested) as a separate buffer,
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* so that we don't have to make the inode structure variable in size. Later,
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* if for example the maximum node name length becomes a runtime setting, we
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* could reconsider this.
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*/
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static char *extra_ptr = NULL;
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static size_t extra_size = 0; /* per inode */
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/*
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* Initialize memory to store extra data.
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*/
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int
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init_extra(unsigned int nr_inodes, size_t inode_extra)
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{
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if (extra_size == 0)
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return OK;
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if ((extra_ptr = malloc(nr_inodes * inode_extra)) == NULL)
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return ENOMEM;
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extra_size = inode_extra;
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return OK;
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}
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/*
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* Initialize the extra data for the given inode to zero.
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*/
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void
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clear_inode_extra(struct inode * node)
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{
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if (extra_size == 0)
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return;
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memset(&extra_ptr[node->i_num * extra_size], 0, extra_size);
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}
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/*
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* Retrieve a pointer to the extra data for the given inode.
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*/
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void *
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get_inode_extra(const struct inode * node)
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{
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if (extra_size == 0)
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return NULL;
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return (void *)&extra_ptr[node->i_num * extra_size];
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}
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