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fs: add readlink support 

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-08-17 00:48:35 +08:00
parent 5b1583d994
commit 2f17f1a22f
2 changed files with 42 additions and 0 deletions
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37
fs/fs.c
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@ -890,6 +890,43 @@ int close(int fd)
}
EXPORT_SYMBOL(close);
int readlink(const char *pathname, char *buf, size_t bufsiz)
{
struct fs_driver_d *fsdrv;
struct fs_device_d *fsdev;
char *p = normalise_path(pathname);
char *freep = p;
int ret;
ret = path_check_prereq(pathname, S_IFLNK);
if (ret)
goto out;
fsdev = get_fs_device_and_root_path(&p);
if (!fsdev) {
ret = -ENODEV;
goto out;
}
fsdrv = fsdev->driver;
if (fsdrv->readlink)
ret = fsdrv->readlink(&fsdev->dev, p, buf, bufsiz);
else
ret = -ENOSYS;
if (ret)
goto out;
out:
free(freep);
if (ret)
errno = -ret;
return ret;
}
EXPORT_SYMBOL(readlink);
static int fs_match(struct device_d *dev, struct driver_d *drv)
{
return strcmp(dev->name, drv->name) ? -1 : 0;

5
include/fs.h
View File

@ -50,6 +50,9 @@ struct fs_driver_d {
/* Truncate a file to given size */
int (*truncate)(struct device_d *dev, FILE *f, ulong size);
int (*readlink)(struct device_d *dev, const char *pathname, char *name,
size_t size);
int (*open)(struct device_d *dev, FILE *f, const char *pathname);
int (*close)(struct device_d *dev, FILE *f);
int (*read)(struct device_d *dev, FILE *f, void *buf, size_t size);
@ -124,6 +127,8 @@ DIR *opendir(const char *pathname);
struct dirent *readdir(DIR *dir);
int closedir(DIR *dir);
int readlink(const char *path, char *buf, size_t bufsiz);
int mount (const char *device, const char *fsname, const char *path);
int umount(const char *pathname);