> that update of the timestamp and i_size needs to be moved to an I/O
> completion handler. We do this already to convert unwritten requests
> to be written in fs/ext4/page_io.c. See ext4_put_io_end_defer() in
> fs/ext4/page_io.c; if we need to convert unwritten extents the
>
> that update of the timestamp and i_size needs to be moved to an I/O
> completion handler. We do this already to convert unwritten requests
> to be written in fs/ext4/page_io.c. See ext4_put_io_end_defer() in
> fs/ext4/page_io.c; if we need to convert unwritten extents the
>
On Sat, Dec 16, 2017 at 01:33:26PM +0900, Seongbae Son wrote:
> > > Details can be found as follows.
> > >
> > > Son et al. "Guaranteeing the Metadata Update Atomicity in EXT4
> > > Filesystem”,
> > > In Proc. of APSYS 2017, Mumbai, India
>
> > This is behind a paywall, so I can't access it. I
On Sat, Dec 16, 2017 at 01:33:26PM +0900, Seongbae Son wrote:
> > > Details can be found as follows.
> > >
> > > Son et al. "Guaranteeing the Metadata Update Atomicity in EXT4
> > > Filesystem”,
> > > In Proc. of APSYS 2017, Mumbai, India
>
> > This is behind a paywall, so I can't access it. I
> > 1. Current file offset of fileA is 14 KB. An application appends 2 KB data
> > to
> > fileA by executing a write() system call. At this time, the file size in
> > the ext4_inode of fileA is updated to 16 KB by ext4_da_write_end().
> > 2. Current file offset of fileB is 14 KB. An application
> > 1. Current file offset of fileA is 14 KB. An application appends 2 KB data
> > to
> > fileA by executing a write() system call. At this time, the file size in
> > the ext4_inode of fileA is updated to 16 KB by ext4_da_write_end().
> > 2. Current file offset of fileB is 14 KB. An application
On Sun, Dec 10, 2017 at 09:12:57PM +0900, seongbaeSon wrote:
> 1. Current file offset of fileA is 14 KB. An application appends 2 KB data to
> fileA by executing a write() system call. At this time, the file size in
> the ext4_inode of fileA is updated to 16 KB by ext4_da_write_end().
> 2.
On Sun, Dec 10, 2017 at 09:12:57PM +0900, seongbaeSon wrote:
> 1. Current file offset of fileA is 14 KB. An application appends 2 KB data to
> fileA by executing a write() system call. At this time, the file size in
> the ext4_inode of fileA is updated to 16 KB by ext4_da_write_end().
> 2.
For one write() system call, the file size in the ext4_inode can be updated
twice; at the write() system call and when dirty pages of the file are written
to storage (i.g. fsync() or kworker thread). The write() system call that
appends data to a file but does not need to allocate a block updates
For one write() system call, the file size in the ext4_inode can be updated
twice; at the write() system call and when dirty pages of the file are written
to storage (i.g. fsync() or kworker thread). The write() system call that
appends data to a file but does not need to allocate a block updates
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