42 lines
891 B
C
42 lines
891 B
C
/* VTreeFS - link.c - support for symbolic links */
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#include "inc.h"
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/*
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* Retrieve symbolic link target.
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*/
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ssize_t
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fs_rdlink(ino_t ino_nr, struct fsdriver_data * data, size_t bytes)
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{
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char path[PATH_MAX];
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struct inode *node;
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size_t len;
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int r;
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if ((node = find_inode(ino_nr)) == NULL)
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return EINVAL;
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/*
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* Call the rdlink hook. The hook must be non-NULL if the file system
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* adds symlink nodes. If it doesn't, we will never get here.
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*/
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assert(vtreefs_hooks->rdlink_hook != NULL);
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assert(!is_inode_deleted(node)); /* symlinks cannot be opened */
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r = vtreefs_hooks->rdlink_hook(node, path, sizeof(path),
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get_inode_cbdata(node));
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if (r != OK) return r;
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len = strlen(path);
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assert(len > 0 && len < sizeof(path));
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if (len > bytes)
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len = bytes;
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/* Copy out the result. */
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if ((r = fsdriver_copyout(data, 0, path, len)) != OK)
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return r;
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return len;
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}
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