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fs: add symlink support 

Limit it's support to existing file only

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-08-21 17:21:33 +08:00
parent 99684498ec
commit 65d4f485eb
2 changed files with 54 additions and 0 deletions
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51
fs/fs.c
View File

@ -927,6 +927,57 @@ out:
}
EXPORT_SYMBOL(readlink);
int symlink(const char *pathname, const char *newpath)
{
struct fs_driver_d *fsdrv;
struct fs_device_d *fsdev;
char *p;
char *freep = normalise_path(pathname);
int ret;
struct stat s;
if (!freep)
return -ENOMEM;
if (!stat(freep, &s) && S_ISDIR(s.st_mode)) {
ret = -ENOSYS;
goto out;
}
free(freep);
freep = p = normalise_path(newpath);
if (!p)
return -ENOMEM;
ret = lstat(p, &s);
if (!ret) {
ret = -EEXIST;
goto out;
}
fsdev = get_fs_device_and_root_path(&p);
if (!fsdev) {
ret = -ENODEV;
goto out;
}
fsdrv = fsdev->driver;
if (fsdrv->symlink) {
ret = fsdrv->symlink(&fsdev->dev, pathname, p);
} else {
ret = -EPERM;
}
out:
free(freep);
if (ret)
errno = -ret;
return ret;
}
EXPORT_SYMBOL(symlink);
static int fs_match(struct device_d *dev, struct driver_d *drv)
{
return strcmp(dev->name, drv->name) ? -1 : 0;

3
include/fs.h
View File

@ -50,6 +50,8 @@ struct fs_driver_d {
/* Truncate a file to given size */
int (*truncate)(struct device_d *dev, FILE *f, ulong size);
int (*symlink)(struct device_d *dev, const char *pathname,
const char *newpath);
int (*readlink)(struct device_d *dev, const char *pathname, char *name,
size_t size);
@ -131,6 +133,7 @@ DIR *opendir(const char *pathname);
struct dirent *readdir(DIR *dir);
int closedir(DIR *dir);
int symlink(const char *pathname, const char *newpath);
int readlink(const char *path, char *buf, size_t bufsiz);
int mount (const char *device, const char *fsname, const char *path);