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btrfs: implement btrfs_write_fs_info

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Change-Id: I507fc4154f8a11235b6b6f8812c3b38924f533f7
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1560
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
This commit is contained in:
brjhaiku 2019-07-04 05:57:22 +05:30 committed by Adrien Destugues
parent ba6665a3dd
commit 1519703abf
3 changed files with 32 additions and 2 deletions
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2
src/add-ons/kernel/file_systems/btrfs/Volume.h
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@ -59,6 +59,8 @@ public:
btrfs_super_block& SuperBlock() { return fSuperBlock; } btrfs_super_block& SuperBlock() { return fSuperBlock; }
mutex& GetLock() { return fLock; }
status_t LoadSuperBlock(); status_t LoadSuperBlock();
status_t WriteSuperBlock(); status_t WriteSuperBlock();

3
src/add-ons/kernel/file_systems/btrfs/btrfs.h
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@ -20,6 +20,7 @@ typedef uint64 fsblock_t; // filesystem block number
#define BTRFS_NUM_ROOT_BACKUPS 4 #define BTRFS_NUM_ROOT_BACKUPS 4
#define BTRFS_CSUM_SIZE 32
struct btrfs_backup_roots { struct btrfs_backup_roots {
uint64 root; uint64 root;
@ -218,7 +219,7 @@ struct btrfs_device {
struct btrfs_super_block { struct btrfs_super_block {
uint8 checksum[32]; uint8 checksum[BTRFS_CSUM_SIZE];
uuid_t fsid; uuid_t fsid;
uint64 blocknum; uint64 blocknum;
uint64 flags; uint64 flags;

29
src/add-ons/kernel/file_systems/btrfs/kernel_interface.cpp
View File

@ -175,6 +175,33 @@ btrfs_read_fs_info(fs_volume* _volume, struct fs_info* info)
} }
static status_t
btrfs_write_fs_info(fs_volume* _volume, const struct fs_info* info, uint32 mask)
{
Volume* volume = (Volume*)_volume->private_volume;
if (volume->IsReadOnly())
return B_READ_ONLY_DEVICE;
if (mask & ~FS_WFITE_FSINFO_NAME != 0)
return B_NOT_SUPPORTED;
MutexLocker locker(volume->GetLock());
status_t status = B_BAD_VALUE;
if (mask & FS_WRITE_FSINFO_NAME) {
btrfs_super_block& superBlock = volume->SuperBlock();
strncpy(superBlock.label, info->volume_name,
sizeof(superBlock.label) - 1);
superBlock.label[sizeof(superBlock.label) - 1] = '\0';
status = volume->WriteSuperBlock();
}
return status;
}
// #pragma mark - // #pragma mark -
@ -1119,7 +1146,7 @@ btrfs_std_ops(int32 op, ...)
fs_volume_ops gBtrfsVolumeOps = { fs_volume_ops gBtrfsVolumeOps = {
&btrfs_unmount, &btrfs_unmount,
&btrfs_read_fs_info, &btrfs_read_fs_info,
NULL, // write_fs_info() &btrfs_write_fs_info,
NULL, // fs_sync, NULL, // fs_sync,
&btrfs_get_vnode, &btrfs_get_vnode,
}; };