c21aa858e2
Extended by David van Moolenbroek to continue using static buffers for short inode names, so as to prevent important file system services such as procfs from running out of memory at runtime. Change-Id: I6f841741ee9944fc87dbdb78b5cdaa2abee9da76
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/* VTreeFS - path.c - name resolution */
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#include "inc.h"
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/*
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* Resolve a path string to an inode.
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*/
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int
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fs_lookup(ino_t dir_nr, char * name, struct fsdriver_node * node_details,
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int * is_mountpt)
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{
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struct inode *node, *child;
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int r;
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if ((node = find_inode(dir_nr)) == NULL)
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return EINVAL;
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if (!S_ISDIR(node->i_stat.mode))
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return ENOTDIR;
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if (strlen(name) > NAME_MAX)
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return ENAMETOOLONG;
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if (!strcmp(name, ".")) {
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/* Stay in the given directory. */
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child = node;
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} else if (!strcmp(name, "..")) {
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/* Progress into the parent directory. */
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if ((child = get_parent_inode(node)) == NULL)
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return ENOENT; /* deleted? should not be possible */
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} else {
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/* Progress into a directory entry. Call the lookup hook, if
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* present, before doing the actual lookup.
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*/
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if (!is_inode_deleted(node) &&
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vtreefs_hooks->lookup_hook != NULL) {
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r = vtreefs_hooks->lookup_hook(node, name,
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get_inode_cbdata(node));
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if (r != OK) return r;
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}
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if ((child = get_inode_by_name(node, name)) == NULL)
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return ENOENT;
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}
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/* On success, open the resulting file and return its details. */
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ref_inode(child);
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node_details->fn_ino_nr = get_inode_number(child);
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node_details->fn_mode = child->i_stat.mode;
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node_details->fn_size = child->i_stat.size;
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node_details->fn_uid = child->i_stat.uid;
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node_details->fn_gid = child->i_stat.gid;
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node_details->fn_dev = child->i_stat.dev;
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*is_mountpt = FALSE;
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return OK;
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}
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