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/* Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
sym40.c -- reiser4 symlink file plugin. */
#include "sym40_repair.h"
#ifdef ENABLE_SYMLINKS
/* Reads whole symlink data to passed @buff. */
static int64_t sym40_read(reiser4_object_t *sym,
void *buff, uint64_t n)
{
errno_t res;
aal_assert("umka-1571", buff != NULL);
aal_assert("umka-1570", sym != NULL);
/* Update stat data coord. */
if ((res = obj40_update(sym)))
return res;
/* Reading symlink extension data. */
if ((res = obj40_read_ext(sym, SDEXT_SYMLINK_ID, buff)))
return res;
return aal_strlen(buff);
}
#ifndef ENABLE_MINIMAL
/* Creates symlink and returns initialized instance to the caller */
static errno_t sym40_create(reiser4_object_t *sym, object_hint_t *hint) {
aal_assert("umka-1740", hint != NULL);
/* Create symlink sta data item. */
return obj40_create_stat(sym, aal_strlen(hint->str), 0, 0, 0,
hint->mode | S_IFLNK | 0644, hint->str);
}
/* Clober symlink, that is clobber its stat data. */
static errno_t sym40_clobber(reiser4_object_t *sym) {
aal_assert("umka-2300", sym != NULL);
return obj40_clobber(sym);
}
#endif
/* This function reads symlink, parses it with aux_parse_path() applying
corresponding callback fucntions for searching stat data and searchig
all entries. It returns stat data key of the object symlink points to.
Note: not static, to allow symlink support detection to work.
Should be changed? */
errno_t sym40_follow(reiser4_object_t *sym,
reiser4_key_t *from,
reiser4_key_t *key)
{
uint32_t size;
errno_t res;
char *path;
aal_assert("umka-1775", key != NULL);
aal_assert("umka-2245", from != NULL);
aal_assert("umka-1774", sym != NULL);
/* Maximal symlink size is MAX_ITEM_LEN. Take the block size to
simplify it. */
size = place_blksize(STAT_PLACE(sym));
if (!(path = aal_calloc(size, 0)))
return -ENOMEM;
/* Read symlink data to @path */
if ((res = sym40_read(sym, path, size) < 0))
goto error;
/* Calling symlink parse function and resolution function. */
if ((res = obj40_core->object_ops.resolve(sym->info.tree,
path, from, key)))
{
goto error;
}
aal_free(path);
return 0;
error:
aal_free(path);
return res;
}
/* Symlink plugin itself. */
reiser4_object_plug_t sym40_plug = {
.p = {
.id = {OBJECT_SYM40_ID, SYM_OBJECT, OBJECT_PLUG_TYPE},
#ifndef ENABLE_MINIMAL
.label = "sym40",
.desc = "Symlink file plugin.",
#endif
},
#ifndef ENABLE_MINIMAL
.inherit = obj40_inherit,
.create = sym40_create,
.metadata = obj40_metadata,
.link = obj40_link,
.unlink = obj40_unlink,
.linked = obj40_linked,
.clobber = sym40_clobber,
.recognize = obj40_recognize,
.check_struct = sym40_check_struct,
.layout = NULL,
.seek = NULL,
.write = NULL,
.convert = NULL,
.truncate = NULL,
.rem_entry = NULL,
.add_entry = NULL,
.build_entry = NULL,
.attach = NULL,
.detach = NULL,
.fake = NULL,
.check_attach = NULL,
#endif
.lookup = NULL,
.reset = NULL,
.offset = NULL,
.readdir = NULL,
.telldir = NULL,
.seekdir = NULL,
.stat = obj40_load_stat,
.read = sym40_read,
.open = obj40_open,
.close = NULL,
.follow = sym40_follow,
#ifndef ENABLE_MINIMAL
.sdext_mandatory = (1 << SDEXT_LW_ID |
1 << SDEXT_SYMLINK_ID),
.sdext_unknown = 0,
#endif
};
#endif
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