Hi..

> In which case EWOULDBLOCK / EAGAIN is set while a write operation ?

i think it will happen if you use O_NONBLOCK but writing operation
itself will clearly block (for numerous reasons e.g block needs to be
allocated first and so on).

> Can any one give detailed processing of a write operation for a file system
> with journaling , like EXT3 File System.

better grab book like Understanding the Linux kernel 3rd edition or
Linux Device Driver 3rd edition. It is explained quite extensively
there.

regards,

Mulyadi.
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