From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 01/18] fs: add readlink support
Date: Mon, 3 Sep 2012 12:08:01 +0200 [thread overview]
Message-ID: <1346666898-19347-1-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <20120903100409.GC24296@game.jcrosoft.org>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
fs/fs.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/fs.h | 5 +++++
2 files changed, 63 insertions(+)
diff --git a/fs/fs.c b/fs/fs.c
index 8ab1a3a..dc9deae 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -890,6 +890,64 @@ 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;
+ size_t len = 0;
+ char tmp[PATH_MAX];
+
+ memset(tmp, 0, PATH_MAX);
+
+ buf[0] = 0;
+
+ 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;
+
+ len = min(bufsiz, (size_t)(PATH_MAX - 1));
+ if (fsdrv->readlink)
+ ret = fsdrv->readlink(&fsdev->dev, p, tmp, len);
+ else
+ ret = -ENOSYS;
+
+ if (ret)
+ goto out;
+
+ if (tmp[0] == '/') {
+ int l = strlen(fsdev->path);
+
+ if (fsdev->path[l - 1] == '/')
+ l--;
+
+ if (l) {
+ len -= l;
+ strncat(buf, fsdev->path, l);
+ }
+ }
+
+ strncat(buf, tmp, len);
+
+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;
diff --git a/include/fs.h b/include/fs.h
index 22470e6..96fe9be 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -51,6 +51,9 @@ 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);
@@ -129,6 +132,8 @@ 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);
--
1.7.10.4
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next prev parent reply other threads:[~2012-09-03 10:08 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-03 10:04 [PATCH 00/18 v3] fs: add symlink and " Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-09-03 10:08 ` [PATCH 02/18] fs: rename stat to lstat as we implement lstat Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 03/18] fs: add symlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 04/18] fs: implement stat Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 05/18] fs: open: add symlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 06/18] fs: introduce get_mounted_path to get the path where a file is mounted Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 07/18] ramfs: add symlink and readlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 08/18] nfs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 09/18] test: add -L support to test if it's a symbolic link Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 10/18] command: add readlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 11/18] command: add ln support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 12/18] ls: add symlink support to -l Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 13/18] dirname: add -V option to return only path related to the mountpoint Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 14/18] recursive_action: add ACTION_FOLLOWLINKS support Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 15/18] envfs: introduce version major and minor Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 16/18] envfs: add support of variable inode size Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 17/18] envfs: add support of symlink Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 10:08 ` [PATCH 18/18] defautenv: " Jean-Christophe PLAGNIOL-VILLARD
2012-09-03 13:04 ` [PATCH 00/18 v3] fs: add symlink and readlink support Sascha Hauer
2012-09-03 14:47 ` Jean-Christophe PLAGNIOL-VILLARD
-- strict thread matches above, loose matches on Subject: below --
2012-09-01 12:35 [PATCH 00/18 v2] " Jean-Christophe PLAGNIOL-VILLARD
2012-09-01 12:37 ` [PATCH 01/18] fs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-08-24 4:46 [PATCH 00/18] fs: add symlink and " Jean-Christophe PLAGNIOL-VILLARD
2012-08-24 4:50 ` [PATCH 01/18] fs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-08-27 13:25 ` Sascha Hauer
2012-09-01 10:50 ` Jean-Christophe PLAGNIOL-VILLARD
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