diff options
Diffstat (limited to 'lib/io.c')
| -rw-r--r-- | lib/io.c | 32 |
1 files changed, 31 insertions, 1 deletions
@@ -79,6 +79,7 @@ int dev_open(const char *dev) close(fd); return ret; } + erofs_devsz = round_down(erofs_devsz, EROFS_BLKSIZ); break; case S_IFREG: ret = ftruncate(fd, 0); @@ -98,7 +99,6 @@ int dev_open(const char *dev) erofs_devname = dev; erofs_devfd = fd; - erofs_devsz = round_down(erofs_devsz, EROFS_BLKSIZ); erofs_info("successfully to open %s", dev); return 0; @@ -177,3 +177,33 @@ int dev_fsync(void) } return 0; } + +int dev_resize(unsigned int blocks) +{ + int ret; + struct stat st; + u64 length; + + if (cfg.c_dry_run || erofs_devsz != INT64_MAX) + return 0; + + ret = fstat(erofs_devfd, &st); + if (ret) { + erofs_err("failed to fstat."); + return -errno; + } + + length = (u64)blocks * EROFS_BLKSIZ; + if (st.st_size == length) + return 0; + if (st.st_size > length) + return ftruncate(erofs_devfd, length); + + length = length - st.st_size; +#if defined(HAVE_FALLOCATE) + if (fallocate(erofs_devfd, 0, st.st_size, length) >= 0) + return 0; +#endif + return dev_fillzero(st.st_size, length, true); +} + |