diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c index 62e2e804928c583727dd42c68fdde3d6f7ba8586..1c1172163c091b79893b2da2d3876719bf513c38 100644 --- a/fs/ext4/ext4_common.c +++ b/fs/ext4/ext4_common.c @@ -1841,16 +1841,20 @@ long int read_allocated_block(struct ext2_inode *inode, int fileblock) return blknr; } -void ext4fs_close(void) +/** + * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's + * global pointers + * + * This function assures that for a file with the same name but different size + * the sequential store on the ext4 filesystem will be correct. + * + * In this function the global data, responsible for internal representation + * of the ext4 data are initialized to the reset state. Without this, during + * replacement of the smaller file with the bigger truncation of new file was + * performed. + */ +void ext4fs_reinit_global(void) { - if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { - ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); - ext4fs_file = NULL; - } - if (ext4fs_root != NULL) { - free(ext4fs_root); - ext4fs_root = NULL; - } if (ext4fs_indir1_block != NULL) { free(ext4fs_indir1_block); ext4fs_indir1_block = NULL; @@ -1870,6 +1874,19 @@ void ext4fs_close(void) ext4fs_indir3_blkno = -1; } } +void ext4fs_close(void) +{ + if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) { + ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen); + ext4fs_file = NULL; + } + if (ext4fs_root != NULL) { + free(ext4fs_root); + ext4fs_root = NULL; + } + + ext4fs_reinit_global(); +} int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name, struct ext2fs_node **fnode, int *ftype) diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c index 3db22f8f93dadefb74af58b4ad3fa379daa47d62..c42add9a7ea95d09543b4938d42668ed03128e73 100644 --- a/fs/ext4/ext4_write.c +++ b/fs/ext4/ext4_write.c @@ -562,6 +562,7 @@ static int ext4fs_delete_file(int inodeno) ext4fs_update(); ext4fs_deinit(); + ext4fs_reinit_global(); if (ext4fs_init() != 0) { printf("error in File System init\n"); diff --git a/include/ext4fs.h b/include/ext4fs.h index aacb147de24bae919c42efdac08dd6c4bf3b8b15..fbbb002b16735725e9440cd2a7920139076e9beb 100644 --- a/include/ext4fs.h +++ b/include/ext4fs.h @@ -133,6 +133,7 @@ int ext4fs_open(const char *filename); int ext4fs_read(char *buf, unsigned len); int ext4fs_mount(unsigned part_length); void ext4fs_close(void); +void ext4fs_reinit_global(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);