search for: fallocate

https://bugzilla.samba.org/show_bug.cgi?id=12305 Bug ID: 12305 Summary: --fallocate and --sparse works wrong Product: rsync Version: 3.1.1 Hardware: All OS: Linux Status: NEW Severity: normal Priority: P5 Component: core Assignee: wayned at samba.org Reporter: socketpair at...

Hi All I was reading through this: http://kashyapc.com/2011/12/02/little-more-disk-io-perf-improvement-with-fallocateing-a-qcow2-disk/ I was basically searching for pointers on improving disk I/O. I wanted to know the purpose of preallocation=full & preallocation=metadata , What is the difference between them ? and which one would yield a better disk I/O speed ? Appreciate your responses in this regard....

...eported problems so I ran the make utility to compile the code base. The following error was almost immediately returned after running make: ./rsync.h:669:26: fatal error: linux/falloc.h: No such file or directory The reported line resides in rsync.h and includes the falloc.h header file if HAVE_FALLOCATE or HAVE_SYS_FALLOCATE is defined by the configuration step. #if defined HAVE_FALLOCATE || HAVE_SYS_FALLOCATE #include <linux/falloc.h> The generated config.h file (created by ./configure) contains a definition of HAVE_FALLOCATE (initialized to 1) and HAVE_POSIX_FALLOCATE. HAVE_SYS_FALLOCATE...

On RHEL 7.5 we need to include <linux/falloc.h> for FALLOC_FL_* macros. Without the macros, fallocate is never used and we fall back to manual zeroing. Here are examples runs with this change with a local file on ext4: $ export SOCK=/tmp/nbd.sock $ export FILE=/var/tmp/nbd.img $ export BLOCK=/dev/loop2 $ src/nbdkit -f plugins/file/.libs/nbdkit-file-plugin.so file=$FILE -U $SOCK $ time qemu-img c...

fallocate() is linux specific and will preallocate the space on disk for the entire file. FALLOC_FL_KEEP_SIZE does not change the filesize as reported by stat(). An aborted transfer will have preallocated disk space which is not "visible" via stat(). This shouldn't matter unless the user does c...

When using block device on RHEL 7.5, file plugin fails to zero with this error (copied from strace): [pid 39551] fallocate(8, FALLOC_FL_ZERO_RANGE, 1536, 64000) = -1 ENODEV (No such device) This is expected error according to the manual: ENODEV fd does not refer to a regular file or a directory. (If fd is a pipe or FIFO, a different error results.) Treat this error as EOPNOSUPP. Tested only on Fedora 28; I don'...

In glibc 2.10 (32 bit) fallocate() exists but fallocate64() doesn't. When _FILE_OFFSET_BITS==64, fallocate() is a redirect to fallocate64() and the program can't be linked (fails to find symbol fallocate64). See http://bugzilla.redhat.com/500487 Attached patch detects fallocate() more robustly to guard against this proble...

Hey all, Trying to use fallocate with qcow2 images to increase performance. When doing so (with OpenStack), my Gluster mountpoint goes into "Transport endpoint is not connected". I am running the Ubuntu 12.04 version of glusterfs-client/server (3.2.5-1ubuntu1) and fuse (2.8.6-2ubuntu2). Any ideas? Thanks, Jacob ------...

The patch titled Subject: ocfs2: check new file size on fallocate call has been added to the -mm mm-nonmm-unstable branch. Its filename is ocfs2-check-new-file-size-on-fallocate-call.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ocfs2-check-new-file-size-on-fallocate-call.patch Th...

On RHEL 7.5 we need to include <linux/falloc.h> for FALLOC_FL_* macros. Without the macros, fallocate is never used and we fall back to manual zeroing. Here are examples runs with this change with a local file on ext4: $ export SOCK=/tmp/nbd.sock $ export FILE=/var/tmp/nbd.img $ export BLOCK=/dev/loop2 $ src/nbdkit -f plugins/file/.libs/nbdkit-file-plugin.so file=$FILE -U $SOCK $ time qemu-img c...

This is a note to let you know that I've just added the patch titled ocfs2: check new file size on fallocate call to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ocfs2-check-new-file-size-on-fallocate-call.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else,...

This is a note to let you know that I've just added the patch titled ocfs2: check new file size on fallocate call to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ocfs2-check-new-file-size-on-fallocate-call.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else,...

This is a note to let you know that I've just added the patch titled ocfs2: check new file size on fallocate call to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ocfs2-check-new-file-size-on-fallocate-call.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, f...

This is a note to let you know that I've just added the patch titled ocfs2: check new file size on fallocate call to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ocfs2-check-new-file-size-on-fallocate-call.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else,...

This is a note to let you know that I've just added the patch titled ocfs2: check new file size on fallocate call to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ocfs2-check-new-file-size-on-fallocate-call.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else,...

This is a note to let you know that I've just added the patch titled ocfs2: check new file size on fallocate call to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ocfs2-check-new-file-size-on-fallocate-call.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, f...

This is a note to let you know that I've just added the patch titled ocfs2: check new file size on fallocate call to the 6.3-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ocfs2-check-new-file-size-on-fallocate-call.patch and it can be found in the queue-6.3 subdirectory. If you, or anyone else, f...

If your system does not support fallocate(2), we use ftruncate(2) to create an output file. fallocate(2) succeeds even if your disk have less space than the requested size, because it creates a sparse file. If you mmap such sparse file, you'll receive a SIGBUS when the disk actually becomes full. So, lld can die suddenly with SIGBUS w...

When using file systems not supporting ZERO_RANGE (e.g. NFS 4.2) or block device on kernel < 4.9, we used to call fallocate() for every zero, fail with EOPNOTSUPP, and fallback to manual zeroing. When trimming, we used to try unsupported fallocate() on every call. Change file handle to remember if punching holes or zeroing range are supported, and avoid unsupported calls. - zero changed to: 1. If we can punch hole...

When using file systems not supporting ZERO_RANGE (e.g. NFS 4.2) or block device on kernel < 4.9, we used to call fallocate() for every zero, fail with EOPNOTSUPP, and fallback to manual zeroing. When trimming, we used to try unsupported fallocate() on every call. Change file handle to remember if punching holes or zeroing range are supported, and avoid unsupported calls. - zero changed to: 1. If we can punch hole...