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cf576c58b3
Under writeback mode, inode->i_blocks is not updated, making utils du read st.blocks as 0. For example, when using virtiofs (cache=always & nondax mode) with writeback_cache enabled, writing a new file and check its disk usage with du, du reports 0 usage. # uname -r 5.6.0-rc6+ # mount -t virtiofs virtiofs /mnt/virtiofs # rm -f /mnt/virtiofs/testfile # create new file and do extend write # xfs_io -fc "pwrite 0 4k" /mnt/virtiofs/testfile wrote 4096/4096 bytes at offset 0 4 KiB, 1 ops; 0.0001 sec (28.103 MiB/sec and 7194.2446 ops/sec) # du -k /mnt/virtiofs/testfile 0 <==== disk usage is 0 # stat -c %s,%b /mnt/virtiofs/testfile 4096,0 <==== i_size is correct, but st_blocks is 0 Fix it by invalidating attr in fuse_flush(), so we get up-to-date attr from server on next getattr. Signed-off-by: Eryu Guan <eguan@linux.alibaba.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.