diff options
Diffstat (limited to 'man2/ioctl_fideduperange.2')
| -rw-r--r-- | man2/ioctl_fideduperange.2 | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/man2/ioctl_fideduperange.2 b/man2/ioctl_fideduperange.2 index 5388c5d..84fd2e8 100644 --- a/man2/ioctl_fideduperange.2 +++ b/man2/ioctl_fideduperange.2 @@ -1,7 +1,7 @@ .\" Copyright (c) 2016, Oracle. All rights reserved. .\" .\" SPDX-License-Identifier: GPL-2.0-or-later -.TH ioctl_fideduperange 2 2023-03-30 "Linux man-pages 6.05.01" +.TH ioctl_fideduperange 2 2024-03-03 "Linux man-pages 6.7" .SH NAME ioctl_fideduperange \- share some the data of one file with another file .SH LIBRARY @@ -12,7 +12,7 @@ Standard C library .BR "#include <linux/fs.h>" " /* Definition of " FIDEDUPERANGE " and" .BR " FILE_DEDUPE_* " constants */ .B #include <sys/ioctl.h> -.PP +.P .BI "int ioctl(int " src_fd ", FIDEDUPERANGE, struct file_dedupe_range *" arg ); .fi .SH DESCRIPTION @@ -32,7 +32,7 @@ If a file write should occur to a shared region, the filesystem must ensure that the changes remain private to the file being written. This behavior is commonly referred to as "copy on write". -.PP +.P This ioctl performs the "compare and share if identical" operation on up to .I src_length bytes from file descriptor @@ -40,7 +40,7 @@ bytes from file descriptor at offset .IR src_offset . This information is conveyed in a structure of the following form: -.PP +.P .in +4n .EX struct file_dedupe_range { @@ -53,20 +53,20 @@ struct file_dedupe_range { }; .EE .in -.PP +.P Deduplication is atomic with regards to concurrent writes, so no locks need to be taken to obtain a consistent deduplicated copy. -.PP +.P The fields .IR reserved1 " and " reserved2 must be zero. -.PP +.P Destinations for the deduplication operation are conveyed in the array at the end of the structure. The number of destinations is given in .IR dest_count , and the destination information is conveyed in the following form: -.PP +.P .in +4n .EX struct file_dedupe_range_info { @@ -78,7 +78,7 @@ struct file_dedupe_range_info { }; .EE .in -.PP +.P Each deduplication operation targets .I src_length bytes in file descriptor @@ -109,14 +109,14 @@ is mapped into and the previous contents in .I dest_fd are freed. -.PP +.P Upon successful completion of this ioctl, the number of bytes successfully deduplicated is returned in .I bytes_deduped and a status code for the deduplication operation is returned in .IR status . If even a single byte in the range does not match, the deduplication -request will be ignored and +operation request will be ignored and .I status set to .BR FILE_DEDUPE_RANGE_DIFFERS . @@ -187,7 +187,7 @@ single call. Linux. .SH HISTORY Linux 4.5. -.PP +.P It was previously known as .B BTRFS_IOC_FILE_EXTENT_SAME and was private to Btrfs. |