search for: fiemap

Hi, We are trying to use OCFS2 as VM storage. After running into problems with qemu's disk_mirror feature we now think there could be a problem with the FIEMAP ioctl in OCFS2. As far as I understand the situation looks like this: Qemu inquiries the FS if the given section of the image is already allocated via the FIEMAP ioctl [1] It especially checks if fm_mapped_extents is greater 0. OCFS2 reports on sections bigger 1048576 there would be 0 mapped_exte...

Introduce a new flag FIEMAP_FLAG_COW to fiemap ioctl(2) interface. If this flag is set, the kernel will only return the mapped extents which are in copy-on-write state. Signed-off-by: Jie Liu <jeff.liu at oracle.com> Cc: Alexander Viro <viro at zeniv.linux.org.uk> Cc: Andreas Dilger <adilger at dilger.ca>...

https://bugzilla.samba.org/show_bug.cgi?id=8918 Summary: Use fiemap to quickly detect zero ranges of source file Product: rsync Version: 3.1.0 Platform: All OS/Version: All Status: NEW Severity: enhancement Priority: P5 Component: core AssignedTo: wayned at...

We''ve been hitting BUG()''s in btrfs_cont_expand and btrfs_fallocate and anywhere else that calls btrfs_get_extent while running xfstests 13 in a loop. This is because fiemap is calling btrfs_get_extent with non-sectorsize aligned offsets, which will end up adding mappings that are not sectorsize aligned, which will cause problems in some cases for subsequent calls to btrfs_get_extent for similar areas that are sectorsize aligned. With this patch I ran xfstests 13 in a...

...s, trying to tweak XFS mount options to mitigate the fragmentation effects. Alas, there is no way to do this purely at the filesystem level. From Dave Chinner, one of the lead XFS devs: "What you want is _physical_ preallocation, not speculative preallocation. i.e. look up XFS_IOC_RESVSP or FIEMAP so your application does _permanent_ preallocate past EOF. Alternatively, the filesystem will avoid the truncation on close() if the file has the APPEND attribute set and the application is writing via O_APPEND... The filesystem cannot do everything for you. Sometimes the application has to help.....

Is there a way to find the holes in sparse files, other than assuming contiguous blocks of zeroes are holes? Thanks, Sean

I just downloaded the pre48 and ran make. It ran fine for everything, but ended with a number of errors related to the syslxcom program. Usually, I only see the messages about the windows build since I am doing the make on a Fedora 10 system. Is there something new that has been added that requires something that I am missing? From looking at the program this isn't related to the isolinux

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:

Hi, how can I do the following in a shell script: - check whether my file system supports cp --reflink? - check whether two files share the same data on disk, i.e. one has been created by cp --reflink of the other? Thank you! Thomas Koch -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info

...eletions(-) diff --git a/block/raw-posix.c b/block/raw-posix.c index 0dce089..a086f89 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -53,6 +53,7 @@ #include <linux/cdrom.h> #include <linux/fd.h> #include <linux/fs.h> +#include <dirent.h> #endif #ifdef CONFIG_FIEMAP #include <linux/fiemap.h> @@ -829,6 +830,62 @@ static int hdev_probe_device(const char *filename) return 0; } +static void read_queue_limit(char *path, const char *filename, unsigned int *val) +{ + FILE *f; + char *tail = path + strlen(path); + + pstrcat(path, MAXPATHLEN, fi...

...eletions(-) diff --git a/block/raw-posix.c b/block/raw-posix.c index 0dce089..a086f89 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -53,6 +53,7 @@ #include <linux/cdrom.h> #include <linux/fd.h> #include <linux/fs.h> +#include <dirent.h> #endif #ifdef CONFIG_FIEMAP #include <linux/fiemap.h> @@ -829,6 +830,62 @@ static int hdev_probe_device(const char *filename) return 0; } +static void read_queue_limit(char *path, const char *filename, unsigned int *val) +{ + FILE *f; + char *tail = path + strlen(path); + + pstrcat(path, MAXPATHLEN, fi...

Hi! Today I converted my /home from Ext4 to BTRFS by reformatting and copying all over again. I created the filesystem with -l 16384 -n 16384 -d single -m single on an logical volume Intel SSD 320 and mount with compress=lzo,spacecache. Current state: merkaba:~> btrfs filesystem show failed to read /dev/sr0 Label: ''home'' uuid: […] Total devices 1 FS bytes used

.....95a7110 100644 --- a/libinstaller/syslxcom.c +++ b/libinstaller/syslxcom.c @@ -45,8 +45,6 @@ int fs_type; # define dprintf(...) ((void)0) #endif -#define SECTOR_SHIFT 9 - static void die(const char *msg) { fputs(msg, stderr); @@ -176,7 +174,7 @@ void set_attributes(int fd) } /* New FIEMAP based mapping */ -static int sectmap_fie(int fd, sector_t *sectors, int nsectors) +static int sectmap_fie(int fd, sector_t *sectors, int nsectors, unsigned sector_size) { struct fiemap *fm; struct fiemap_extent *fe; @@ -193,7 +191,7 @@ static int sectmap_fie(int fd, sector_t *sectors, in...

I was Googling around for ways to check fragmentation on Btrfs, and I came across the ''filefrag'' command. Even though it is a ext2/3 command, it seems to work on Btrfs files since it uses the FIEMAP ioctl to determine the number of extents. From a bash prompt, I found I could examine large sections with something like: # for file in $(find <PATH/TO/BTRFS/VOL/> -type f); do filefrag ${file}; done | sort -n -k 2 | less You may want to start with smaller, more discrete portions of a Btrf...

...cate (+4/-0) Btrfs: use dget_parent where we can UPDATED (+43/-12) Btrfs: handle the space_cache option properly (+1/-0) Btrfs: update inode ctime when using links (+1/-0) Btrfs: fix more ESTALE problems with NFS (+1/-0) Btrfs: handle NFS lookups properly (+76/-0) Btrfs: fix fiemap (+54/-9) Chris Mason (4) commits (+124/-9): Btrfs: deal with DIO bios that span more than one ordered extent (+89/-4) Btrfs: avoid NULL pointer deref in try_release_extent_buffer (+4/-2) Btrfs: don''t use migrate page without CONFIG_MIGRATION (+6/-1) Btrfs: add migrate page...

It seems to me that it should be possible to make --inplace and --sparse compatible. The manpage says -S, --sparse ... Conflicts with --inplace because it's not possible to overwrite data in a sparse fashion. but I think it _is_ possible to do that, provided the receiving side opens the dest file read-write instead of write-only. When writing within the existing

Just a quick update, I''ve dropped the hashing stuff in favor of doing a memcmp in the kernel to make sure the data is still the same. The thing that takes a while is reading the data up from disk, so doing a memcmp of the entire buffer isn''t that big of a deal, not to mention there''s a possiblity for malicious users if there is a problem with the hashing algorithms we

...ttp://www.redhat.com/rhel/server/resource_center/ The following list summarizes improvements to this release: * Hardware - 10 GigE drivers with GRO support - FCoE support on standard NICs - SR I/OV support * System - Kernel tracepoints for systemtap use - Per process I/O accounting - FIEMAP support * Virtualization - Hypervisor scalability to 192 cpus - Additional hypervisor - Kernel Based Virtual Machine (KVM) Additional Information ---------------------- Additional information is provided below on Accessing the Software, Documentation, Support, and Mailing Lists. Enjoy...

See http://rwmj.wordpress.com/2014/11/23/mapping-files-to-disk/

...86 "/src/linux/include/linux" "list_lru.h" > .file 87 "/src/linux/include/uapi/linux" "time.h" > .file 88 "/src/linux/include/linux" "stat.h" > .file 89 "/src/linux/include/uapi/linux" "fiemap.h" > .file 90 "/src/linux/include/linux" "cdev.h" > .file 91 "/src/linux/include/linux" "migrate_mode.h" > .file 92 "/src/linux/include/linux" "swap.h" > .file 93 "/src/linux/ar...