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| author | Philipp Zabel <p.zabel@pengutronix.de> | 2018-02-01 11:37:17 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-02-05 08:26:22 +0100 |
| commit | 87aa4832f7f3587a65ee92ffa24f528652684c1b (patch) | |
| tree | 164be1aaaf4c24e45aa6b78605c9b4f69ee96800 /fs/devfs-core.c | |
| parent | 119147ebfd2827558b6d27e525c2d8da6bf2865a (diff) | |
| download | barebox-87aa4832f7f3587a65ee92ffa24f528652684c1b.tar.gz barebox-87aa4832f7f3587a65ee92ffa24f528652684c1b.tar.xz | |
fs: add support loop mount offset
When loop mounting, allow to specify an offset into the file, similarly
to the losetup offset option. Multiplicative suffixes are supported.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'fs/devfs-core.c')
| -rw-r--r-- | fs/devfs-core.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/devfs-core.c b/fs/devfs-core.c index be56edd18d..ea5887c720 100644 --- a/fs/devfs-core.c +++ b/fs/devfs-core.c @@ -464,7 +464,7 @@ static const struct file_operations loop_ops = { .lseek = dev_lseek_default, }; -struct cdev *cdev_create_loop(const char *path, ulong flags) +struct cdev *cdev_create_loop(const char *path, ulong flags, loff_t offset) { struct cdev *new; struct loop_priv *priv; @@ -486,15 +486,15 @@ struct cdev *cdev_create_loop(const char *path, ulong flags) new->priv = priv; ofs = lseek(priv->fd, 0, SEEK_END); - if (ofs < 0) { + if (ofs < 0 || ofs <= offset) { free(new); free(priv); return NULL; } - lseek(priv->fd, 0, SEEK_SET); + lseek(priv->fd, offset, SEEK_SET); new->size = ofs; - new->offset = 0; + new->offset = offset; new->dev = NULL; new->flags = 0; |