The Flash Friendly File System (F2FS) is a file system created by Samsung. It was released with Linux kernel 3.8 in February 2013.
The free space is stored in a bitmap file. The bitmap file is a set of bits, each representing a block of the storage unit. If the block is unused, the bit is set to show it is unused. When a block is used, the bit is set to show its status as used. The files and directories are tracked in a table.
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