kernel.git/drivers/md/dm-bufio.c, branch linux-3.5.y

dm bufio: prefetch

2012-03-28T17:41:29Z

This patch introduces a new function dm_bufio_prefetch. It prefetches the specified range of blocks into dm-bufio cache without waiting for i/o completion. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon

dm-bufio.c: there's no need to include linux/version.h

2012-02-03T21:38:12Z

As 'make versioncheck' points out, drivers/md/dm-bufio.c has no need to include linux/version.h, so this patch removes the unneeded include. Signed-off-by: Jesper Juhl Acked-by: Mikulas Patocka Signed-off-by: Jiri Kosina

device-mapper: dm-bufio.c needs to include module.h

2011-11-07T18:29:10Z

since it uses the module facilities. Reported-by: Witold Baryluk Signed-off-by: Stephen Rothwell Signed-off-by: Paul Gortmaker Signed-off-by: Linus Torvalds

dm: add bufio

2011-10-31T20:19:09Z

The dm-bufio interface allows you to do cached I/O on devices, holding recently-read blocks in memory and performing delayed writes. We don't use buffer cache or page cache already present in the kernel, because: * we need to handle block sizes larger than a page * we can't allocate memory to perform reads or we'd have deadlocks Currently, when a cache is required, we limit its size to a fraction of available memory. Usage can be viewed and changed in /sys/module/dm_bufio/parameters/ . The first user is thin provisioning, but more dm users are planned. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon