fs: implement stat
stat() stats the file pointed to by path and fills in buf. Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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65d4f485eb
commit
2d7ac4aa33
105
fs/fs.c
105
fs/fs.c
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@ -26,6 +26,7 @@
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#include <errno.h>
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#include <malloc.h>
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#include <linux/stat.h>
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#include <linux/err.h>
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#include <fcntl.h>
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#include <xfuncs.h>
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#include <init.h>
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@ -111,6 +112,61 @@ static int init_cwd(void)
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postcore_initcall(init_cwd);
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char *normalise_link(const char *pathname, const char *symlink)
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{
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const char *buf = symlink;
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char *path_free, *path;
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char *absolute_path;
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int point = 0;
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int dir = 1;
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int len;
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if (symlink[0] == '/')
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return strdup(symlink);
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while (*buf == '.' || *buf == '/') {
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if (*buf == '.') {
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point++;
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} else if (*buf == '/') {
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point = 0;
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dir++;
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}
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if (point > 2) {
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buf -= 2;
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break;
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}
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buf++;
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}
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path = path_free = strdup(pathname);
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if (!path)
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return NULL;
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while(dir) {
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path = dirname(path);
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dir--;
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}
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len = strlen(buf) + strlen(path) + 1;
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if (buf[0] != '/')
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len++;
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absolute_path = calloc(sizeof(char), len);
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if (!absolute_path)
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goto out;
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strcat(absolute_path, path);
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if (buf[0] != '/')
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strcat(absolute_path, "/");
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strcat(absolute_path, buf);
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out:
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free(path_free);
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return absolute_path;
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}
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char *normalise_path(const char *pathname)
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{
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char *path = xzalloc(strlen(pathname) + strlen(cwd) + 2);
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@ -512,6 +568,42 @@ out:
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}
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EXPORT_SYMBOL(unlink);
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static char *realfile(const char *pathname, struct stat *s)
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{
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char *path = normalise_path(pathname);
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int ret;
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ret = lstat(path, s);
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if (ret)
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goto out;
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if (S_ISLNK(s->st_mode)) {
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char tmp[PATH_MAX];
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char *new_path;
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memset(tmp, 0, PATH_MAX);
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ret = readlink(path, tmp, PATH_MAX - 1);
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if (ret < 0)
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goto out;
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new_path = normalise_link(path, tmp);
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free(path);
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if (!new_path)
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return ERR_PTR(-ENOMEM);
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path = new_path;
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ret = lstat(path, s);
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}
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if (!ret)
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return path;
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out:
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free(path);
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return ERR_PTR(ret);
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}
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int open(const char *pathname, int flags, ...)
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{
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struct fs_device_d *fsdev;
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@ -1218,6 +1310,19 @@ int closedir(DIR *dir)
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}
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EXPORT_SYMBOL(closedir);
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int stat(const char *filename, struct stat *s)
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{
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char *f;
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f = realfile(filename, s);
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if (IS_ERR(f))
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return PTR_ERR(f);
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free(f);
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return 0;
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}
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EXPORT_SYMBOL(stat);
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int lstat(const char *filename, struct stat *s)
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{
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struct device_d *dev;
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@ -107,10 +107,7 @@ int unlink(const char *pathname);
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int close(int fd);
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int flush(int fd);
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int lstat(const char *filename, struct stat *s);
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static inline int stat(const char *filename, struct stat *s)
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{
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return lstat(filename, s);
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}
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int stat(const char *filename, struct stat *s);
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int read(int fd, void *buf, size_t count);
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int ioctl(int fd, int request, void *buf);
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ssize_t write(int fd, const void *buf, size_t count);
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@ -169,6 +166,7 @@ void *read_file(const char *filename, size_t *size);
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* of "..", "." and double slashes. The returned string must be freed wit free().
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*/
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char *normalise_path(const char *path);
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char *normalise_link(const char *pathname, const char* symlink);
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/* Register a new filesystem driver */
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int register_fs_driver(struct fs_driver_d *fsdrv);
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