From: Stephen Warren swarren@nvidia.com
This hooks into the generic "file exists" support added in an earlier patch, and provides an implementation for the ext4 filesystem.
Signed-off-by: Stephen Warren swarren@nvidia.com --- fs/ext4/ext4fs.c | 8 ++++++++ fs/fs.c | 2 +- include/ext4fs.h | 1 + 3 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/ext4fs.c b/fs/ext4/ext4fs.c index 735b2564175b..71ecdd8e9a31 100644 --- a/fs/ext4/ext4fs.c +++ b/fs/ext4/ext4fs.c @@ -174,6 +174,14 @@ int ext4fs_ls(const char *dirname) return 0; }
+int ext4fs_exists(const char *filename) +{ + int file_len; + + file_len = ext4fs_open(filename); + return (file_len >= 0) ? 0 : 1; +} + int ext4fs_read(char *buf, unsigned len) { if (ext4fs_root == NULL || ext4fs_file == NULL) diff --git a/fs/fs.c b/fs/fs.c index 4f344c6d6d72..3f14d0169b43 100644 --- a/fs/fs.c +++ b/fs/fs.c @@ -91,7 +91,7 @@ static struct fstype_info fstypes[] = { .probe = ext4fs_probe, .close = ext4fs_close, .ls = ext4fs_ls, - .exists = fs_exists_unsupported, + .exists = ext4fs_exists, .read = ext4_read_file, .write = fs_write_unsupported, }, diff --git a/include/ext4fs.h b/include/ext4fs.h index 242938039662..aacb147de24b 100644 --- a/include/ext4fs.h +++ b/include/ext4fs.h @@ -134,6 +134,7 @@ int ext4fs_read(char *buf, unsigned len); int ext4fs_mount(unsigned part_length); void ext4fs_close(void); int ext4fs_ls(const char *dirname); +int ext4fs_exists(const char *filename); void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot); int ext4fs_devread(lbaint_t sector, int byte_offset, int byte_len, char *buf); void ext4fs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);