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Linux: Implement FS_IOC_GETVERSION

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Provide access to file generation number on Linux.

Add test coverage.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Ryan Moeller <freqlabs@FreeBSD.org>
Closes #12856
This commit is contained in:
Ryan Moeller
2021-12-17 19:18:37 -05:00
committed by GitHub
parent 82e414f1b2
commit 3fa5266d72
14 changed files with 226 additions and 0 deletions
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module/os/linux/zfs/zpl_file.c
+13
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@@ -817,6 +817,14 @@ zpl_fallocate(struct file *filp, int mode, loff_t offset, loff_t len)
mode, offset, len);
}
static int
zpl_ioctl_getversion(struct file *filp, void __user *arg)
{
uint32_t generation = file_inode(filp)->i_generation;
return (copy_to_user(arg, &generation, sizeof (generation)));
}
#define ZFS_FL_USER_VISIBLE (FS_FL_USER_VISIBLE | ZFS_PROJINHERIT_FL)
#define ZFS_FL_USER_MODIFIABLE (FS_FL_USER_MODIFIABLE | ZFS_PROJINHERIT_FL)
@@ -989,6 +997,8 @@ static long
zpl_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case FS_IOC_GETVERSION:
return (zpl_ioctl_getversion(filp, (void *)arg));
case FS_IOC_GETFLAGS:
return (zpl_ioctl_getflags(filp, (void *)arg));
case FS_IOC_SETFLAGS:
@@ -1007,6 +1017,9 @@ static long
zpl_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case FS_IOC32_GETVERSION:
cmd = FS_IOC_GETVERSION;
break;
case FS_IOC32_GETFLAGS:
cmd = FS_IOC_GETFLAGS;
break;