diff options
Diffstat (limited to 'fs/ext4/ext4fs.c')
| -rw-r--r-- | fs/ext4/ext4fs.c | 44 |
1 files changed, 36 insertions, 8 deletions
diff --git a/fs/ext4/ext4fs.c b/fs/ext4/ext4fs.c index 735b2564175..4f1b4c8bce9 100644 --- a/fs/ext4/ext4fs.c +++ b/fs/ext4/ext4fs.c @@ -63,6 +63,14 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos, char *delayed_buf = NULL; short status; + if (le32_to_cpu(node->inode.flags) & EXT4_EXTENTS_FL) { + if (ext4fs_build_extent_cache(&node->inode)) { + printf("Error building extent cache!\n"); + len = -1; + goto out_exit; + } + } + /* Adjust len so it we can't read past the end of the file. */ if (len > filesize) len = filesize; @@ -75,8 +83,10 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos, int blockend = blocksize; int skipfirst = 0; blknr = read_allocated_block(&(node->inode), i); - if (blknr < 0) - return -1; + if (blknr < 0) { + len = -1; + goto out_exit; + } blknr = blknr << log2_fs_blocksize; @@ -106,8 +116,10 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos, delayed_skipfirst, delayed_extent, delayed_buf); - if (status == 0) - return -1; + if (status == 0) { + len = -1; + goto out_exit; + } previous_block_number = blknr; delayed_start = blknr; delayed_extent = blockend; @@ -132,8 +144,10 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos, delayed_skipfirst, delayed_extent, delayed_buf); - if (status == 0) - return -1; + if (status == 0) { + len = -1; + goto out_exit; + } previous_block_number = -1; } memset(buf, 0, blocksize - skipfirst); @@ -145,11 +159,17 @@ int ext4fs_read_file(struct ext2fs_node *node, int pos, status = ext4fs_devread(delayed_start, delayed_skipfirst, delayed_extent, delayed_buf); - if (status == 0) - return -1; + if (status == 0) { + len = -1; + goto out_exit; + } previous_block_number = -1; } + +out_exit: + ext4fs_free_extent_cache(); + return len; } @@ -174,6 +194,14 @@ 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; +} + int ext4fs_read(char *buf, unsigned len) { if (ext4fs_root == NULL || ext4fs_file == NULL) |